/src/git/config.c

Source
/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 * Copyright (C) Johannes Schindelin, 2005
 *
 */

#include "git-compat-util.h"
#include "abspath.h"
#include "advice.h"
#include "date.h"
#include "branch.h"
#include "config.h"
#include "dir.h"
#include "parse.h"
#include "convert.h"
#include "environment.h"
#include "gettext.h"
#include "git-zlib.h"
#include "repository.h"
#include "lockfile.h"
#include "exec-cmd.h"
#include "strbuf.h"
#include "quote.h"
#include "hashmap.h"
#include "string-list.h"
#include "object-name.h"
#include "odb.h"
#include "path.h"
#include "utf8.h"
#include "color.h"
#include "refs.h"
#include "setup.h"
#include "strvec.h"
#include "trace2.h"
#include "wildmatch.h"
#include "write-or-die.h"

struct config_source {
  struct config_source *prev;
  union {
    FILE *file;
    struct config_buf {
      const char *buf;
      size_t len;
      size_t pos;
    } buf;
  } u;
  enum config_origin_type origin_type;
  const char *name;
  enum config_error_action default_error_action;
  int linenr;
  int eof;
  size_t total_len;
  struct strbuf value;
  struct strbuf var;
  unsigned subsection_case_sensitive : 1;

  int (*do_fgetc)(struct config_source *c);
  int (*do_ungetc)(int c, struct config_source *conf);
  long (*do_ftell)(struct config_source *c);
};
#define CONFIG_SOURCE_INIT { 0 }

/*
 * Config that comes from trusted scopes, namely:
 * - CONFIG_SCOPE_SYSTEM (e.g. /etc/gitconfig)
 * - CONFIG_SCOPE_GLOBAL (e.g. $HOME/.gitconfig, $XDG_CONFIG_HOME/git)
 * - CONFIG_SCOPE_COMMAND (e.g. "-c" option, environment variables)
 *
 * This is declared here for code cleanliness, but unlike the other
 * static variables, this does not hold config parser state.
 */
static struct config_set protected_config;

static int config_file_fgetc(struct config_source *conf)
{
  return getc_unlocked(conf->u.file);
}

static int config_file_ungetc(int c, struct config_source *conf)
{
  return ungetc(c, conf->u.file);
}

static long config_file_ftell(struct config_source *conf)
{
  return ftell(conf->u.file);
}

static int config_buf_fgetc(struct config_source *conf)
{
  if (conf->u.buf.pos < conf->u.buf.len)
    return conf->u.buf.buf[conf->u.buf.pos++];

  return EOF;
}

static int config_buf_ungetc(int c, struct config_source *conf)
{
  if (conf->u.buf.pos > 0) {
    conf->u.buf.pos--;
    if (conf->u.buf.buf[conf->u.buf.pos] != c)
      BUG("config_buf can only ungetc the same character");
    return c;
  }

  return EOF;
}

static long config_buf_ftell(struct config_source *conf)
{
  return conf->u.buf.pos;
}

struct config_include_data {
  int depth;
  config_fn_t fn;
  void *data;
  const struct config_options *opts;
  const struct git_config_source *config_source;
  struct repository *repo;

  /*
   * All remote URLs discovered when reading all config files.
   */
  struct string_list *remote_urls;
};
#define CONFIG_INCLUDE_INIT { 0 }

static int git_config_include(const char *var, const char *value,
            const struct config_context *ctx, void *data);

#define MAX_INCLUDE_DEPTH 10
static const char include_depth_advice[] = N_(
"exceeded maximum include depth (%d) while including\n"
" %s\n"
"from\n"
" %s\n"
"This might be due to circular includes.");
static int handle_path_include(const struct key_value_info *kvi,
             const char *path,
             struct config_include_data *inc)
{
  int ret = 0;
  struct strbuf buf = STRBUF_INIT;
  char *expanded;

  if (!path)
    return config_error_nonbool("include.path");

  expanded = interpolate_path(path, 0);
  if (!expanded)
    return error(_("could not expand include path '%s'"), path);
  path = expanded;

  /*
   * Use an absolute path as-is, but interpret relative paths
   * based on the including config file.
   */
  if (!is_absolute_path(path)) {
    const char *slash;

    if (!kvi || kvi->origin_type != CONFIG_ORIGIN_FILE) {
      ret = error(_("relative config includes must come from files"));
      goto cleanup;
    }

    slash = find_last_dir_sep(kvi->filename);
    if (slash)
      strbuf_add(&buf, kvi->filename, slash - kvi->filename + 1);
    strbuf_addstr(&buf, path);
    path = buf.buf;
  }

  if (!access_or_die(path, R_OK, 0)) {
    if (++inc->depth > MAX_INCLUDE_DEPTH)
      die(_(include_depth_advice), MAX_INCLUDE_DEPTH, path,
          !kvi ? "<unknown>" :
          kvi->filename ? kvi->filename :
          "the command line");
    ret = git_config_from_file_with_options(git_config_include, path, inc,
              kvi->scope, NULL);
    inc->depth--;
  }
cleanup:
  strbuf_release(&buf);
  free(expanded);
  return ret;
}

static void add_trailing_starstar_for_dir(struct strbuf *pat)
{
  if (pat->len && is_dir_sep(pat->buf[pat->len - 1]))
    strbuf_addstr(pat, "**");
}

static int prepare_include_condition_pattern(const struct key_value_info *kvi,
               struct strbuf *pat,
               size_t *out)
{
  struct strbuf path = STRBUF_INIT;
  char *expanded;
  size_t prefix = 0;

  expanded = interpolate_path(pat->buf, 1);
  if (expanded) {
    strbuf_reset(pat);
    strbuf_addstr(pat, expanded);
    free(expanded);
  }

  if (pat->buf[0] == '.' && is_dir_sep(pat->buf[1])) {
    const char *slash;

    if (!kvi || kvi->origin_type != CONFIG_ORIGIN_FILE)
      return error(_("relative config include "
               "conditionals must come from files"));

    strbuf_realpath(&path, kvi->filename, 1);
    slash = find_last_dir_sep(path.buf);
    if (!slash)
      BUG("how is this possible?");
    strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
    prefix = slash - path.buf + 1 /* slash */;
  } else if (!is_absolute_path(pat->buf))
    strbuf_insertstr(pat, 0, "**/");

  add_trailing_starstar_for_dir(pat);

  *out = prefix;

  strbuf_release(&path);
  return 0;
}

static int include_by_path(const struct key_value_info *kvi,
         const char *path,
         const char *cond, size_t cond_len, int icase)
{
  struct strbuf text = STRBUF_INIT;
  struct strbuf pattern = STRBUF_INIT;
  size_t prefix;
  int ret = 0;
  int already_tried_absolute = 0;

  if (!path)
    goto done;

  strbuf_realpath(&text, path, 1);
  strbuf_add(&pattern, cond, cond_len);
  ret = prepare_include_condition_pattern(kvi, &pattern, &prefix);
  if (ret < 0)
    goto done;

again:
  if (prefix > 0) {
    /*
     * perform literal matching on the prefix part so that
     * any wildcard character in it can't create side effects.
     */
    if (text.len < prefix)
      goto done;
    if (!icase && strncmp(pattern.buf, text.buf, prefix))
      goto done;
    if (icase && strncasecmp(pattern.buf, text.buf, prefix))
      goto done;
  }

  ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
       WM_PATHNAME | (icase ? WM_CASEFOLD : 0));

  if (!ret && !already_tried_absolute) {
    /*
     * We've tried e.g. matching gitdir:~/work, but if
     * ~/work is a symlink to /mnt/storage/work
     * strbuf_realpath() will expand it, so the rule won't
     * match. Let's match against a
     * strbuf_add_absolute_path() version of the path,
     * which'll do the right thing
     */
    strbuf_reset(&text);
    strbuf_add_absolute_path(&text, path);
    already_tried_absolute = 1;
    goto again;
  }
done:
  strbuf_release(&pattern);
  strbuf_release(&text);
  return ret;
}

static int include_by_branch(struct config_include_data *data,
           const char *cond, size_t cond_len)
{
  int flags;
  int ret;
  struct strbuf pattern = STRBUF_INIT;
  const char *refname, *shortname;

  if (!data->repo || data->repo->ref_storage_format == REF_STORAGE_FORMAT_UNKNOWN)
    return 0;

  refname = refs_resolve_ref_unsafe(get_main_ref_store(data->repo),
            "HEAD", 0, NULL, &flags);
  if (!refname ||
      !(flags & REF_ISSYMREF) ||
      !skip_prefix(refname, "refs/heads/", &shortname))
    return 0;

  strbuf_add(&pattern, cond, cond_len);
  add_trailing_starstar_for_dir(&pattern);
  ret = !wildmatch(pattern.buf, shortname, WM_PATHNAME);
  strbuf_release(&pattern);
  return ret;
}

static int add_remote_url(const char *var, const char *value,
        const struct config_context *ctx UNUSED, void *data)
{
  struct string_list *remote_urls = data;
  const char *remote_name;
  size_t remote_name_len;
  const char *key;

  if (!parse_config_key(var, "remote", &remote_name, &remote_name_len,
            &key) &&
      remote_name &&
      !strcmp(key, "url"))
    string_list_append(remote_urls, value);
  return 0;
}

static void populate_remote_urls(struct config_include_data *inc)
{
  struct config_options opts;

  opts = *inc->opts;
  opts.unconditional_remote_url = 1;

  inc->remote_urls = xmalloc(sizeof(*inc->remote_urls));
  string_list_init_dup(inc->remote_urls);
  config_with_options(add_remote_url, inc->remote_urls,
          inc->config_source, inc->repo, &opts);
}

static int forbid_remote_url(const char *var, const char *value UNUSED,
           const struct config_context *ctx UNUSED,
           void *data UNUSED)
{
  const char *remote_name;
  size_t remote_name_len;
  const char *key;

  if (!parse_config_key(var, "remote", &remote_name, &remote_name_len,
            &key) &&
      remote_name &&
      !strcmp(key, "url"))
    die(_("remote URLs cannot be configured in file directly or indirectly included by includeIf.hasconfig:remote.*.url"));
  return 0;
}

static int at_least_one_url_matches_glob(const char *glob, int glob_len,
           struct string_list *remote_urls)
{
  struct strbuf pattern = STRBUF_INIT;
  struct string_list_item *url_item;
  int found = 0;

  strbuf_add(&pattern, glob, glob_len);
  for_each_string_list_item(url_item, remote_urls) {
    if (!wildmatch(pattern.buf, url_item->string, WM_PATHNAME)) {
      found = 1;
      break;
    }
  }
  strbuf_release(&pattern);
  return found;
}

static int include_by_remote_url(struct config_include_data *inc,
    const char *cond, size_t cond_len)
{
  if (inc->opts->unconditional_remote_url)
    return 1;
  if (!inc->remote_urls)
    populate_remote_urls(inc);
  return at_least_one_url_matches_glob(cond, cond_len,
               inc->remote_urls);
}

static int include_condition_is_true(const struct key_value_info *kvi,
             struct config_include_data *inc,
             const char *cond, size_t cond_len)
{
  const struct config_options *opts = inc->opts;

  if (skip_prefix_mem(cond, cond_len, "gitdir:", &cond, &cond_len))
    return include_by_path(kvi, opts->git_dir, cond, cond_len, 0);
  else if (skip_prefix_mem(cond, cond_len, "gitdir/i:", &cond, &cond_len))
    return include_by_path(kvi, opts->git_dir, cond, cond_len, 1);
  else if (skip_prefix_mem(cond, cond_len, "worktree:", &cond, &cond_len))
    return include_by_path(kvi, inc->repo ? repo_get_work_tree(inc->repo) : NULL,
               cond, cond_len, 0);
  else if (skip_prefix_mem(cond, cond_len, "worktree/i:", &cond, &cond_len))
    return include_by_path(kvi, inc->repo ? repo_get_work_tree(inc->repo) : NULL,
               cond, cond_len, 1);
  else if (skip_prefix_mem(cond, cond_len, "onbranch:", &cond, &cond_len))
    return include_by_branch(inc, cond, cond_len);
  else if (skip_prefix_mem(cond, cond_len, "hasconfig:remote.*.url:", &cond,
           &cond_len))
    return include_by_remote_url(inc, cond, cond_len);

  /* unknown conditionals are always false */
  return 0;
}

static int git_config_include(const char *var, const char *value,
            const struct config_context *ctx,
            void *data)
{
  struct config_include_data *inc = data;
  const char *cond, *key;
  size_t cond_len;
  int ret;

  /*
   * Pass along all values, including "include" directives; this makes it
   * possible to query information on the includes themselves.
   */
  ret = inc->fn(var, value, ctx, inc->data);
  if (ret < 0)
    return ret;

  if (!strcmp(var, "include.path"))
    ret = handle_path_include(ctx->kvi, value, inc);

  if (!parse_config_key(var, "includeif", &cond, &cond_len, &key) &&
      cond && include_condition_is_true(ctx->kvi, inc, cond, cond_len) &&
      !strcmp(key, "path")) {
    config_fn_t old_fn = inc->fn;

    if (inc->opts->unconditional_remote_url)
      inc->fn = forbid_remote_url;
    ret = handle_path_include(ctx->kvi, value, inc);
    inc->fn = old_fn;
  }

  return ret;
}

void git_config_append_parameter(struct strbuf *env, const char *key,
         const char *value)
{
  if (env->len)
    strbuf_addch(env, ' ');
  sq_quote_buf(env, key);
  strbuf_addch(env, '=');
  if (value)
    sq_quote_buf(env, value);
}

static void git_config_push_split_parameter(const char *key, const char *value)
{
  struct strbuf env = STRBUF_INIT;
  const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  if (old && *old)
    strbuf_addstr(&env, old);
  git_config_append_parameter(&env, key, value);
  setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  strbuf_release(&env);
}

void git_config_push_parameter(const char *text)
{
  const char *value;

  /*
   * When we see:
   *
   *   section.subsection=with=equals.key=value
   *
   * we cannot tell if it means:
   *
   *   [section "subsection=with=equals"]
   *   key = value
   *
   * or:
   *
   *   [section]
   *   subsection = with=equals.key=value
   *
   * We parse left-to-right for the first "=", meaning we'll prefer to
   * keep the value intact over the subsection. This is historical, but
   * also sensible since values are more likely to contain odd or
   * untrusted input than a section name.
   *
   * A missing equals is explicitly allowed (as a bool-only entry).
   */
  value = strchr(text, '=');
  if (value) {
    char *key = xmemdupz(text, value - text);
    git_config_push_split_parameter(key, value + 1);
    free(key);
  } else {
    git_config_push_split_parameter(text, NULL);
  }
}

void git_config_push_env(const char *spec)
{
  char *key;
  const char *env_name;
  const char *env_value;

  env_name = strrchr(spec, '=');
  if (!env_name)
    die(_("invalid config format: %s"), spec);
  key = xmemdupz(spec, env_name - spec);
  env_name++;
  if (!*env_name)
    die(_("missing environment variable name for configuration '%.*s'"),
        (int)(env_name - spec - 1), spec);

  env_value = getenv(env_name);
  if (!env_value)
    die(_("missing environment variable '%s' for configuration '%.*s'"),
        env_name, (int)(env_name - spec - 1), spec);

  git_config_push_split_parameter(key, env_value);
  free(key);
}

static inline int iskeychar(int c)
{
  return isalnum(c) || c == '-';
}

/*
 * Auxiliary function to sanity-check and split the key into the section
 * identifier and variable name.
 *
 * Returns 0 on success, -1 when there is an invalid character in the key and
 * -2 if there is no section name in the key.
 *
 * store_key - pointer to char* which will hold a copy of the key with
 *             lowercase section and variable name, can be NULL to skip
 *             allocation when only validation is needed
 * baselen - pointer to size_t which will hold the length of the
 *           section + subsection part, can be NULL
 * quiet - when non-zero, suppress error() reports on rejection
 */
static int do_parse_config_key(const char *key, char **store_key,
             size_t *baselen_, int quiet)
{
  size_t i, baselen;
  int dot;
  const char *last_dot = strrchr(key, '.');

  /*
   * Since "key" actually contains the section name and the real
   * key name separated by a dot, we have to know where the dot is.
   */

  if (last_dot == NULL || last_dot == key) {
    if (!quiet)
      error(_("key does not contain a section: %s"), key);
    return -CONFIG_NO_SECTION_OR_NAME;
  }

  if (!last_dot[1]) {
    if (!quiet)
      error(_("key does not contain variable name: %s"), key);
    return -CONFIG_NO_SECTION_OR_NAME;
  }

  baselen = last_dot - key;
  if (baselen_)
    *baselen_ = baselen;

  /*
   * Validate the key and while at it, lower case it for matching.
   */
  if (store_key)
    *store_key = xmallocz(strlen(key));

  dot = 0;
  for (i = 0; key[i]; i++) {
    unsigned char c = key[i];
    if (c == '.')
      dot = 1;
    /* Leave the extended basename untouched.. */
    if (!dot || i > baselen) {
      if (!iskeychar(c) ||
          (i == baselen + 1 && !isalpha(c))) {
        if (!quiet)
          error(_("invalid key: %s"), key);
        goto out_free_ret_1;
      }
      c = tolower(c);
    } else if (c == '\n') {
      if (!quiet)
        error(_("invalid key (newline): %s"), key);
      goto out_free_ret_1;
    }
    if (store_key)
      (*store_key)[i] = c;
  }

  return 0;

out_free_ret_1:
  if (store_key)
    FREE_AND_NULL(*store_key);
  return -CONFIG_INVALID_KEY;
}

int git_config_parse_key(const char *key, char **store_key, size_t *baselen_)
{
  return do_parse_config_key(key, store_key, baselen_, 0);
}

int git_config_key_is_valid(const char *key)
{
  return !do_parse_config_key(key, NULL, NULL, 1);
}

static int config_parse_pair(const char *key, const char *value,
           struct key_value_info *kvi,
           config_fn_t fn, void *data)
{
  char *canonical_name;
  int ret;
  struct config_context ctx = {
    .kvi = kvi,
  };

  if (!strlen(key))
    return error(_("empty config key"));
  if (git_config_parse_key(key, &canonical_name, NULL))
    return -1;

  ret = (fn(canonical_name, value, &ctx, data) < 0) ? -1 : 0;
  free(canonical_name);
  return ret;
}


/* for values read from `git_config_from_parameters()` */
void kvi_from_param(struct key_value_info *out)
{
  out->filename = NULL;
  out->linenr = -1;
  out->origin_type = CONFIG_ORIGIN_CMDLINE;
  out->scope = CONFIG_SCOPE_COMMAND;
}

int git_config_parse_parameter(const char *text,
             config_fn_t fn, void *data)
{
  const char *value;
  struct string_list pair = STRING_LIST_INIT_DUP;
  int ret;
  struct key_value_info kvi = KVI_INIT;

  kvi_from_param(&kvi);

  string_list_split(&pair, text, "=", 1);
  if (!pair.nr)
    return error(_("bogus config parameter: %s"), text);

  if (pair.nr == 1)
    value = NULL;
  else
    value = pair.items[1].string;

  if (!*pair.items[0].string) {
    string_list_clear(&pair, 0);
    return error(_("bogus config parameter: %s"), text);
  }

  ret = config_parse_pair(pair.items[0].string, value, &kvi, fn, data);
  string_list_clear(&pair, 0);
  return ret;
}

static int parse_config_env_list(char *env, struct key_value_info *kvi,
         config_fn_t fn, void *data)
{
  char *cur = env;
  while (cur && *cur) {
    const char *key = sq_dequote_step(cur, &cur);
    if (!key)
      return error(_("bogus format in %s"),
             CONFIG_DATA_ENVIRONMENT);

    if (!cur || isspace(*cur)) {
      /* old-style 'key=value' */
      if (git_config_parse_parameter(key, fn, data) < 0)
        return -1;
    }
    else if (*cur == '=') {
      /* new-style 'key'='value' */
      const char *value;

      cur++;
      if (*cur == '\'') {
        /* quoted value */
        value = sq_dequote_step(cur, &cur);
        if (!value || (cur && !isspace(*cur))) {
          return error(_("bogus format in %s"),
                 CONFIG_DATA_ENVIRONMENT);
        }
      } else if (!*cur || isspace(*cur)) {
        /* implicit bool: 'key'= */
        value = NULL;
      } else {
        return error(_("bogus format in %s"),
               CONFIG_DATA_ENVIRONMENT);
      }

      if (config_parse_pair(key, value, kvi, fn, data) < 0)
        return -1;
    }
    else {
      /* unknown format */
      return error(_("bogus format in %s"),
             CONFIG_DATA_ENVIRONMENT);
    }

    if (cur) {
      while (isspace(*cur))
        cur++;
    }
  }
  return 0;
}

int git_config_from_parameters(config_fn_t fn, void *data)
{
  const char *env;
  struct strbuf envvar = STRBUF_INIT;
  struct strvec to_free = STRVEC_INIT;
  int ret = 0;
  char *envw = NULL;
  struct key_value_info kvi = KVI_INIT;

  kvi_from_param(&kvi);
  env = getenv(CONFIG_COUNT_ENVIRONMENT);
  if (env) {
    unsigned long count;
    char *endp;

    count = strtoul(env, &endp, 10);
    if (*endp) {
      ret = error(_("bogus count in %s"), CONFIG_COUNT_ENVIRONMENT);
      goto out;
    }
    if (count > INT_MAX) {
      ret = error(_("too many entries in %s"), CONFIG_COUNT_ENVIRONMENT);
      goto out;
    }

    for (unsigned long i = 0; i < count; i++) {
      const char *key, *value;

      strbuf_addf(&envvar, "GIT_CONFIG_KEY_%lu", i);
      key = getenv_safe(&to_free, envvar.buf);
      if (!key) {
        ret = error(_("missing config key %s"), envvar.buf);
        goto out;
      }
      strbuf_reset(&envvar);

      strbuf_addf(&envvar, "GIT_CONFIG_VALUE_%lu", i);
      value = getenv_safe(&to_free, envvar.buf);
      if (!value) {
        ret = error(_("missing config value %s"), envvar.buf);
        goto out;
      }
      strbuf_reset(&envvar);

      if (config_parse_pair(key, value, &kvi, fn, data) < 0) {
        ret = -1;
        goto out;
      }
    }
  }

  env = getenv(CONFIG_DATA_ENVIRONMENT);
  if (env) {
    /* sq_dequote will write over it */
    envw = xstrdup(env);
    if (parse_config_env_list(envw, &kvi, fn, data) < 0) {
      ret = -1;
      goto out;
    }
  }

out:
  strbuf_release(&envvar);
  strvec_clear(&to_free);
  free(envw);
  return ret;
}

static int get_next_char(struct config_source *cs)
{
  int c = cs->do_fgetc(cs);

  if (c == '\r') {
    /* DOS like systems */
    c = cs->do_fgetc(cs);
    if (c != '\n') {
      if (c != EOF)
        cs->do_ungetc(c, cs);
      c = '\r';
    }
  }

  if (c != EOF && ++cs->total_len > INT_MAX) {
    /*
     * This is an absurdly long config file; refuse to parse
     * further in order to protect downstream code from integer
     * overflows. Note that we can't return an error specifically,
     * but we can mark EOF and put trash in the return value,
     * which will trigger a parse error.
     */
    cs->eof = 1;
    return 0;
  }

  if (c == '\n')
    cs->linenr++;
  if (c == EOF) {
    cs->eof = 1;
    cs->linenr++;
    c = '\n';
  }
  return c;
}

static char *parse_value(struct config_source *cs)
{
  int quote = 0, comment = 0;
  size_t trim_len = 0;

  strbuf_reset(&cs->value);
  for (;;) {
    int c = get_next_char(cs);
    if (c == '\n') {
      if (quote) {
        cs->linenr--;
        return NULL;
      }
      if (trim_len)
        strbuf_setlen(&cs->value, trim_len);
      return cs->value.buf;
    }
    if (comment)
      continue;
    if (isspace(c) && !quote) {
      if (!trim_len)
        trim_len = cs->value.len;
      if (cs->value.len)
        strbuf_addch(&cs->value, c);
      continue;
    }
    if (!quote) {
      if (c == ';' || c == '#') {
        comment = 1;
        continue;
      }
    }
    if (trim_len)
      trim_len = 0;
    if (c == '\\') {
      c = get_next_char(cs);
      switch (c) {
      case '\n':
        continue;
      case 't':
        c = '\t';
        break;
      case 'b':
        c = '\b';
        break;
      case 'n':
        c = '\n';
        break;
      /* Some characters escape as themselves */
      case '\\': case '"':
        break;
      /* Reject unknown escape sequences */
      default:
        return NULL;
      }
      strbuf_addch(&cs->value, c);
      continue;
    }
    if (c == '"') {
      quote = 1 - quote;
      continue;
    }
    strbuf_addch(&cs->value, c);
  }
}

static int get_value(struct config_source *cs, struct key_value_info *kvi,
         config_fn_t fn, void *data, struct strbuf *name)
{
  int c;
  char *value;
  int ret;
  struct config_context ctx = {
    .kvi = kvi,
  };

  /* Get the full name */
  for (;;) {
    c = get_next_char(cs);
    if (cs->eof)
      break;
    if (!iskeychar(c))
      break;
    strbuf_addch(name, tolower(c));
  }

  while (c == ' ' || c == '\t')
    c = get_next_char(cs);

  value = NULL;
  if (c != '\n') {
    if (c != '=')
      return -1;
    value = parse_value(cs);
    if (!value)
      return -1;
  }
  /*
   * We already consumed the \n, but we need linenr to point to
   * the line we just parsed during the call to fn to get
   * accurate line number in error messages.
   */
  cs->linenr--;
  kvi->linenr = cs->linenr;
  ret = fn(name->buf, value, &ctx, data);
  if (ret >= 0)
    cs->linenr++;
  return ret;
}

static int get_extended_base_var(struct config_source *cs, struct strbuf *name,
         int c)
{
  cs->subsection_case_sensitive = 0;
  do {
    if (c == '\n')
      goto error_incomplete_line;
    c = get_next_char(cs);
  } while (isspace(c));

  /* We require the format to be '[base "extension"]' */
  if (c != '"')
    return -1;
  strbuf_addch(name, '.');

  for (;;) {
    int c = get_next_char(cs);
    if (c == '\n')
      goto error_incomplete_line;
    if (c == '"')
      break;
    if (c == '\\') {
      c = get_next_char(cs);
      if (c == '\n')
        goto error_incomplete_line;
    }
    strbuf_addch(name, c);
  }

  /* Final ']' */
  if (get_next_char(cs) != ']')
    return -1;
  return 0;
error_incomplete_line:
  cs->linenr--;
  return -1;
}

static int get_base_var(struct config_source *cs, struct strbuf *name)
{
  cs->subsection_case_sensitive = 1;
  for (;;) {
    int c = get_next_char(cs);
    if (cs->eof)
      return -1;
    if (c == ']')
      return 0;
    if (isspace(c))
      return get_extended_base_var(cs, name, c);
    if (!iskeychar(c) && c != '.')
      return -1;
    strbuf_addch(name, tolower(c));
  }
}

struct parse_event_data {
  enum config_event_t previous_type;
  size_t previous_offset;
  const struct config_options *opts;
};

static int do_event(struct config_source *cs, enum config_event_t type,
        struct parse_event_data *data)
{
  size_t offset;

  if (!data->opts || !data->opts->event_fn)
    return 0;

  if (type == CONFIG_EVENT_WHITESPACE &&
      data->previous_type == type)
    return 0;

  offset = cs->do_ftell(cs);
  /*
   * At EOF, the parser always "inserts" an extra '\n', therefore
   * the end offset of the event is the current file position, otherwise
   * we will already have advanced to the next event.
   */
  if (type != CONFIG_EVENT_EOF)
    offset--;

  if (data->previous_type != CONFIG_EVENT_EOF &&
      data->opts->event_fn(data->previous_type, data->previous_offset,
         offset, cs, data->opts->event_fn_data) < 0)
    return -1;

  data->previous_type = type;
  data->previous_offset = offset;

  return 0;
}

static void kvi_from_source(struct config_source *cs,
          enum config_scope scope,
          struct key_value_info *out)
{
  out->filename = strintern(cs->name);
  out->origin_type = cs->origin_type;
  out->linenr = cs->linenr;
  out->scope = scope;
}

static int git_parse_source(struct config_source *cs, config_fn_t fn,
          struct key_value_info *kvi, void *data,
          const struct config_options *opts)
{
  int comment = 0;
  size_t baselen = 0;
  struct strbuf *var = &cs->var;
  int error_return = 0;
  char *error_msg = NULL;

  /* U+FEFF Byte Order Mark in UTF8 */
  const char *bomptr = utf8_bom;

  /* For the parser event callback */
  struct parse_event_data event_data = {
    CONFIG_EVENT_EOF, 0, opts
  };

  for (;;) {
    int c;

    c = get_next_char(cs);
    if (bomptr && *bomptr) {
      /* We are at the file beginning; skip UTF8-encoded BOM
       * if present. Sane editors won't put this in on their
       * own, but e.g. Windows Notepad will do it happily. */
      if (c == (*bomptr & 0377)) {
        bomptr++;
        continue;
      } else {
        /* Do not tolerate partial BOM. */
        if (bomptr != utf8_bom)
          break;
        /* No BOM at file beginning. Cool. */
        bomptr = NULL;
      }
    }
    if (c == '\n') {
      if (cs->eof) {
        if (do_event(cs, CONFIG_EVENT_EOF, &event_data) < 0)
          return -1;
        return 0;
      }
      if (do_event(cs, CONFIG_EVENT_WHITESPACE, &event_data) < 0)
        return -1;
      comment = 0;
      continue;
    }
    if (comment)
      continue;
    if (isspace(c)) {
      if (do_event(cs, CONFIG_EVENT_WHITESPACE, &event_data) < 0)
          return -1;
      continue;
    }
    if (c == '#' || c == ';') {
      if (do_event(cs, CONFIG_EVENT_COMMENT, &event_data) < 0)
          return -1;
      comment = 1;
      continue;
    }
    if (c == '[') {
      if (do_event(cs, CONFIG_EVENT_SECTION, &event_data) < 0)
          return -1;

      /* Reset prior to determining a new stem */
      strbuf_reset(var);
      if (get_base_var(cs, var) < 0 || var->len < 1)
        break;
      strbuf_addch(var, '.');
      baselen = var->len;
      continue;
    }
    if (!isalpha(c))
      break;

    if (do_event(cs, CONFIG_EVENT_ENTRY, &event_data) < 0)
      return -1;

    /*
     * Truncate the var name back to the section header
     * stem prior to grabbing the suffix part of the name
     * and the value.
     */
    strbuf_setlen(var, baselen);
    strbuf_addch(var, tolower(c));
    if (get_value(cs, kvi, fn, data, var) < 0)
      break;
  }

  if (do_event(cs, CONFIG_EVENT_ERROR, &event_data) < 0)
    return -1;

  switch (cs->origin_type) {
  case CONFIG_ORIGIN_BLOB:
    error_msg = xstrfmt(_("bad config line %d in blob %s"),
              cs->linenr, cs->name);
    break;
  case CONFIG_ORIGIN_FILE:
    error_msg = xstrfmt(_("bad config line %d in file %s"),
              cs->linenr, cs->name);
    break;
  case CONFIG_ORIGIN_STDIN:
    error_msg = xstrfmt(_("bad config line %d in standard input"),
              cs->linenr);
    break;
  case CONFIG_ORIGIN_SUBMODULE_BLOB:
    error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
               cs->linenr, cs->name);
    break;
  case CONFIG_ORIGIN_CMDLINE:
    error_msg = xstrfmt(_("bad config line %d in command line %s"),
               cs->linenr, cs->name);
    break;
  default:
    error_msg = xstrfmt(_("bad config line %d in %s"),
              cs->linenr, cs->name);
  }

  switch (opts && opts->error_action ?
    opts->error_action :
    cs->default_error_action) {
  case CONFIG_ERROR_DIE:
    die("%s", error_msg);
    break;
  case CONFIG_ERROR_ERROR:
    error_return = error("%s", error_msg);
    break;
  case CONFIG_ERROR_SILENT:
    error_return = -1;
    break;
  case CONFIG_ERROR_UNSET:
    BUG("config error action unset");
  }

  free(error_msg);
  return error_return;
}

NORETURN
static void die_bad_number(const char *name, const char *value,
         const struct key_value_info *kvi)
{
  const char *error_type = (errno == ERANGE) ?
    N_("out of range") : N_("invalid unit");
  const char *bad_numeric = N_("bad numeric config value '%s' for '%s': %s");

  if (!kvi)
    BUG("kvi should not be NULL");

  if (!value)
    value = "";

  if (!kvi->filename)
    die(_(bad_numeric), value, name, _(error_type));

  switch (kvi->origin_type) {
  case CONFIG_ORIGIN_BLOB:
    die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
        value, name, kvi->filename, _(error_type));
  case CONFIG_ORIGIN_FILE:
    die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
        value, name, kvi->filename, _(error_type));
  case CONFIG_ORIGIN_STDIN:
    die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
        value, name, _(error_type));
  case CONFIG_ORIGIN_SUBMODULE_BLOB:
    die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
        value, name, kvi->filename, _(error_type));
  case CONFIG_ORIGIN_CMDLINE:
    die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
        value, name, kvi->filename, _(error_type));
  default:
    die(_("bad numeric config value '%s' for '%s' in %s: %s"),
        value, name, kvi->filename, _(error_type));
  }
}

int git_config_int(const char *name, const char *value,
       const struct key_value_info *kvi)
{
  int ret;
  if (!git_parse_int(value, &ret))
    die_bad_number(name, value, kvi);
  return ret;
}

unsigned int git_config_uint(const char *name, const char *value,
           const struct key_value_info *kvi)
{
  unsigned int ret;
  if (!git_parse_uint(value, &ret))
    die_bad_number(name, value, kvi);
  return ret;
}

int64_t git_config_int64(const char *name, const char *value,
       const struct key_value_info *kvi)
{
  int64_t ret;
  if (!git_parse_int64(value, &ret))
    die_bad_number(name, value, kvi);
  return ret;
}

unsigned long git_config_ulong(const char *name, const char *value,
             const struct key_value_info *kvi)
{
  unsigned long ret;
  if (!git_parse_ulong(value, &ret))
    die_bad_number(name, value, kvi);
  return ret;
}

ssize_t git_config_ssize_t(const char *name, const char *value,
         const struct key_value_info *kvi)
{
  ssize_t ret;
  if (!git_parse_ssize_t(value, &ret))
    die_bad_number(name, value, kvi);
  return ret;
}

size_t git_config_size_t(const char *name, const char *value,
       const struct key_value_info *kvi)
{
  size_t ret;
  if (!git_parse_size_t(value, &ret))
    die_bad_number(name, value, kvi);
  return ret;
}

double git_config_double(const char *name, const char *value,
       const struct key_value_info *kvi)
{
  double ret;
  if (!git_parse_double(value, &ret))
    die_bad_number(name, value, kvi);
  return ret;
}

int git_config_bool_or_int(const char *name, const char *value,
         const struct key_value_info *kvi, int *is_bool)
{
  int v = git_parse_maybe_bool_text(value);
  if (0 <= v) {
    *is_bool = 1;
    return v;
  }
  *is_bool = 0;
  return git_config_int(name, value, kvi);
}

int git_config_bool(const char *name, const char *value)
{
  int v = git_parse_maybe_bool(value);
  if (v < 0)
    die(_("bad boolean config value '%s' for '%s'"), value, name);
  return v;
}

int git_config_string(char **dest, const char *var, const char *value)
{
  if (!value)
    return config_error_nonbool(var);
  *dest = xstrdup(value);
  return 0;
}

int git_config_pathname(char **dest, const char *var, const char *value)
{
  bool is_optional;
  char *path;

  if (!value)
    return config_error_nonbool(var);

  is_optional = skip_prefix(value, ":(optional)", &value);
  path = interpolate_path(value, 0);
  if (!path)
    die(_("failed to expand user dir in: '%s'"), value);

  if (is_optional && is_missing_file(path)) {
    free(path);
    *dest = NULL;
    return 0;
  }

  *dest = path;
  return 0;
}

int git_config_expiry_date(timestamp_t *timestamp, const char *var, const char *value)
{
  if (!value)
    return config_error_nonbool(var);
  if (parse_expiry_date(value, timestamp))
    return error(_("'%s' for '%s' is not a valid timestamp"),
           value, var);
  return 0;
}

int git_config_color(char *dest, const char *var, const char *value)
{
  if (!value)
    return config_error_nonbool(var);
  if (color_parse(value, dest) < 0)
    return -1;
  return 0;
}

/*
 * All source specific fields in the union, die_on_error, name and the callbacks
 * fgetc, ungetc, ftell of top need to be initialized before calling
 * this function.
 */
static int do_config_from(struct config_source *top, config_fn_t fn,
        void *data, enum config_scope scope,
        const struct config_options *opts)
{
  struct key_value_info kvi = KVI_INIT;
  int ret;

  /* push config-file parsing state stack */
  top->linenr = 1;
  top->eof = 0;
  top->total_len = 0;
  strbuf_init(&top->value, 1024);
  strbuf_init(&top->var, 1024);
  kvi_from_source(top, scope, &kvi);

  ret = git_parse_source(top, fn, &kvi, data, opts);

  strbuf_release(&top->value);
  strbuf_release(&top->var);

  return ret;
}

static int do_config_from_file(config_fn_t fn,
             const enum config_origin_type origin_type,
             const char *name, FILE *f, void *data,
             enum config_scope scope,
             const struct config_options *opts)
{
  struct config_source top = CONFIG_SOURCE_INIT;
  int ret;

  if (origin_type == CONFIG_ORIGIN_FILE && (!name || !*name))
    BUG("missing filename for CONFIG_ORIGIN_FILE");

  top.u.file = f;
  top.origin_type = origin_type;
  top.name = name;
  top.default_error_action = CONFIG_ERROR_DIE;
  top.do_fgetc = config_file_fgetc;
  top.do_ungetc = config_file_ungetc;
  top.do_ftell = config_file_ftell;

  flockfile(f);
  ret = do_config_from(&top, fn, data, scope, opts);
  funlockfile(f);
  return ret;
}

static int git_config_from_stdin(config_fn_t fn, void *data,
         enum config_scope scope)
{
  return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", stdin, data,
           scope, NULL);
}

int git_config_from_file_with_options(config_fn_t fn, const char *filename,
              void *data, enum config_scope scope,
              const struct config_options *opts)
{
  int ret = -1;
  FILE *f;

  if (!filename)
    BUG("filename cannot be NULL");
  f = fopen_or_warn(filename, "r");
  if (f) {
    ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename,
            f, data, scope, opts);
    fclose(f);
  }
  return ret;
}

int git_config_from_file(config_fn_t fn, const char *filename, void *data)
{
  return git_config_from_file_with_options(fn, filename, data,
             CONFIG_SCOPE_UNKNOWN, NULL);
}

int git_config_from_mem(config_fn_t fn,
      const enum config_origin_type origin_type,
      const char *name, const char *buf, size_t len,
      void *data, enum config_scope scope,
      const struct config_options *opts)
{
  struct config_source top = CONFIG_SOURCE_INIT;

  top.u.buf.buf = buf;
  top.u.buf.len = len;
  top.u.buf.pos = 0;
  top.origin_type = origin_type;
  top.name = name;
  top.default_error_action = CONFIG_ERROR_ERROR;
  top.do_fgetc = config_buf_fgetc;
  top.do_ungetc = config_buf_ungetc;
  top.do_ftell = config_buf_ftell;

  return do_config_from(&top, fn, data, scope, opts);
}

int git_config_from_blob_oid(config_fn_t fn,
            const char *name,
            struct repository *repo,
            const struct object_id *oid,
            void *data,
            enum config_scope scope)
{
  enum object_type type;
  char *buf;
  size_t size;
  int ret;

  buf = odb_read_object(repo->objects, oid, &type, &size);
  if (!buf)
    return error(_("unable to load config blob object '%s'"), name);
  if (type != OBJ_BLOB) {
    free(buf);
    return error(_("reference '%s' does not point to a blob"), name);
  }

  ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size,
          data, scope, NULL);
  free(buf);

  return ret;
}

static int git_config_from_blob_ref(config_fn_t fn,
            struct repository *repo,
            const char *name,
            void *data,
            enum config_scope scope)
{
  struct object_id oid;

  if (repo_get_oid(repo, name, &oid) < 0)
    return error(_("unable to resolve config blob '%s'"), name);
  return git_config_from_blob_oid(fn, name, repo, &oid, data, scope);
}

char *git_system_config(void)
{
  char *system_config = xstrdup_or_null(getenv("GIT_CONFIG_SYSTEM"));
  if (!system_config)
    system_config = system_path(ETC_GITCONFIG);
  normalize_path_copy(system_config, system_config);
  return system_config;
}

char *git_global_config(void)
{
  char *user_config, *xdg_config;

  git_global_config_paths(&user_config, &xdg_config);
  if (!user_config) {
    free(xdg_config);
    return NULL;
  }

  if (access_or_warn(user_config, R_OK, 0) && xdg_config &&
      !access_or_warn(xdg_config, R_OK, 0)) {
    free(user_config);
    return xdg_config;
  } else {
    free(xdg_config);
    return user_config;
  }
}

void git_global_config_paths(char **user_out, char **xdg_out)
{
  char *user_config = xstrdup_or_null(getenv("GIT_CONFIG_GLOBAL"));
  char *xdg_config = NULL;

  if (!user_config) {
    user_config = interpolate_path("~/.gitconfig", 0);
    xdg_config = xdg_config_home("config");
  }

  *user_out = user_config;
  *xdg_out = xdg_config;
}

int git_config_system(void)
{
  return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
}

static int do_git_config_sequence(const struct config_options *opts,
          const struct repository *repo,
          config_fn_t fn, void *data)
{
  int ret = 0;
  char *system_config = git_system_config();
  char *xdg_config = NULL;
  char *user_config = NULL;
  char *repo_config;
  char *worktree_config;

  /*
   * Ensure that either:
   * - the git_dir and commondir are both set, or
   * - the git_dir and commondir are both NULL
   */
  if (!opts->git_dir != !opts->commondir)
    BUG("only one of commondir and git_dir is non-NULL");

  if (opts->commondir) {
    repo_config = mkpathdup("%s/config", opts->commondir);
    worktree_config = mkpathdup("%s/config.worktree", opts->git_dir);
  } else {
    repo_config = NULL;
    worktree_config = NULL;
  }

  if (git_config_system() && system_config &&
      !access_or_die(system_config, R_OK,
         opts->system_gently ? ACCESS_EACCES_OK : 0))
    ret += git_config_from_file_with_options(fn, system_config,
               data, CONFIG_SCOPE_SYSTEM,
               NULL);

  git_global_config_paths(&user_config, &xdg_config);

  if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
    ret += git_config_from_file_with_options(fn, xdg_config, data,
               CONFIG_SCOPE_GLOBAL, NULL);

  if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
    ret += git_config_from_file_with_options(fn, user_config, data,
               CONFIG_SCOPE_GLOBAL, NULL);

  if (!opts->ignore_repo && repo_config &&
      !access_or_die(repo_config, R_OK, 0))
    ret += git_config_from_file_with_options(fn, repo_config, data,
               CONFIG_SCOPE_LOCAL, NULL);

  if (!opts->ignore_worktree && worktree_config &&
      repo && repo->repository_format_worktree_config &&
      !access_or_die(worktree_config, R_OK, 0)) {
      ret += git_config_from_file_with_options(fn, worktree_config, data,
                 CONFIG_SCOPE_WORKTREE,
                 NULL);
  }

  if (!opts->ignore_cmdline && git_config_from_parameters(fn, data) < 0)
    die(_("unable to parse command-line config"));

  free(system_config);
  free(xdg_config);
  free(user_config);
  free(repo_config);
  free(worktree_config);
  return ret;
}

int config_with_options(config_fn_t fn, void *data,
      const struct git_config_source *config_source,
      struct repository *repo,
      const struct config_options *opts)
{
  struct config_include_data inc = CONFIG_INCLUDE_INIT;
  int ret;

  if (opts->respect_includes) {
    inc.fn = fn;
    inc.data = data;
    inc.opts = opts;
    inc.repo = repo;
    inc.config_source = config_source;
    fn = git_config_include;
    data = &inc;
  }

  /*
   * If we have a specific filename, use it. Otherwise, follow the
   * regular lookup sequence.
   */
  if (config_source && config_source->use_stdin) {
    ret = git_config_from_stdin(fn, data, config_source->scope);
  } else if (config_source && config_source->file) {
    ret = git_config_from_file_with_options(fn, config_source->file,
              data, config_source->scope,
              NULL);
  } else if (config_source && config_source->blob) {
    ret = git_config_from_blob_ref(fn, repo, config_source->blob,
                 data, config_source->scope);
  } else {
    ret = do_git_config_sequence(opts, repo, fn, data);
  }

  if (inc.remote_urls) {
    string_list_clear(inc.remote_urls, 0);
    FREE_AND_NULL(inc.remote_urls);
  }
  return ret;
}

static void configset_iter(struct config_set *set, config_fn_t fn, void *data)
{
  int value_index;
  struct string_list *values;
  struct config_set_element *entry;
  struct configset_list *list = &set->list;
  struct config_context ctx = CONFIG_CONTEXT_INIT;

  for (size_t i = 0; i < list->nr; i++) {
    entry = list->items[i].e;
    value_index = list->items[i].value_index;
    values = &entry->value_list;

    ctx.kvi = values->items[value_index].util;
    if (fn(entry->key, values->items[value_index].string, &ctx, data) < 0)
      git_die_config_linenr(entry->key,
                ctx.kvi->filename,
                ctx.kvi->linenr);
  }
}

void read_early_config(struct repository *repo, config_fn_t cb, void *data)
{
  struct config_options opts = {0};
  struct strbuf commondir = STRBUF_INIT;
  struct strbuf gitdir = STRBUF_INIT;

  opts.respect_includes = 1;

  if (repo && repo->gitdir) {
    opts.commondir = repo_get_common_dir(repo);
    opts.git_dir = repo_get_git_dir(repo);
  /*
   * When setup_git_directory() was not yet asked to discover the
   * GIT_DIR, we ask discover_git_directory() to figure out whether there
   * is any repository config we should use (but unlike
   * setup_git_directory_gently(), no global state is changed, most
   * notably, the current working directory is still the same after the
   * call).
   */
  } else if (!discover_git_directory(&commondir, &gitdir)) {
    opts.commondir = commondir.buf;
    opts.git_dir = gitdir.buf;
  }

  config_with_options(cb, data, NULL, NULL, &opts);

  strbuf_release(&commondir);
  strbuf_release(&gitdir);
}

void read_very_early_config(config_fn_t cb, void *data)
{
  struct config_options opts = { 0 };

  opts.respect_includes = 1;
  opts.ignore_repo = 1;
  opts.ignore_worktree = 1;
  opts.ignore_cmdline = 1;
  opts.system_gently = 1;

  config_with_options(cb, data, NULL, NULL, &opts);
}

RESULT_MUST_BE_USED
static int configset_find_element(struct config_set *set, const char *key,
          struct config_set_element **dest)
{
  struct config_set_element k;
  struct config_set_element *found_entry;
  char *normalized_key;
  int ret;

  /*
   * `key` may come from the user, so normalize it before using it
   * for querying entries from the hashmap.
   */
  ret = git_config_parse_key(key, &normalized_key, NULL);
  if (ret)
    return ret;

  hashmap_entry_init(&k.ent, strhash(normalized_key));
  k.key = normalized_key;
  found_entry = hashmap_get_entry(&set->config_hash, &k, ent, NULL);
  free(normalized_key);
  *dest = found_entry;
  return 0;
}

static int configset_add_value(const struct key_value_info *kvi_p,
             struct config_set *set, const char *key,
             const char *value)
{
  struct config_set_element *e;
  struct string_list_item *si;
  struct configset_list_item *l_item;
  struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
  int ret;

  ret = configset_find_element(set, key, &e);
  if (ret)
    return ret;
  /*
   * Since the keys are being fed by git_config*() callback mechanism, they
   * are already normalized. So simply add them without any further munging.
   */
  if (!e) {
    e = xmalloc(sizeof(*e));
    hashmap_entry_init(&e->ent, strhash(key));
    e->key = xstrdup(key);
    string_list_init_dup(&e->value_list);
    hashmap_add(&set->config_hash, &e->ent);
  }
  si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));

  ALLOC_GROW(set->list.items, set->list.nr + 1, set->list.alloc);
  l_item = &set->list.items[set->list.nr++];
  l_item->e = e;
  l_item->value_index = e->value_list.nr - 1;

  *kv_info = *kvi_p;
  si->util = kv_info;

  return 0;
}

static int config_set_element_cmp(const void *cmp_data UNUSED,
          const struct hashmap_entry *eptr,
          const struct hashmap_entry *entry_or_key,
          const void *keydata UNUSED)
{
  const struct config_set_element *e1, *e2;

  e1 = container_of(eptr, const struct config_set_element, ent);
  e2 = container_of(entry_or_key, const struct config_set_element, ent);

  return strcmp(e1->key, e2->key);
}

void git_configset_init(struct config_set *set)
{
  hashmap_init(&set->config_hash, config_set_element_cmp, NULL, 0);
  set->hash_initialized = 1;
  set->list.nr = 0;
  set->list.alloc = 0;
  set->list.items = NULL;
}

void git_configset_clear(struct config_set *set)
{
  struct config_set_element *entry;
  struct hashmap_iter iter;
  if (!set->hash_initialized)
    return;

  hashmap_for_each_entry(&set->config_hash, &iter, entry,
        ent /* member name */) {
    free(entry->key);
    string_list_clear(&entry->value_list, 1);
  }
  hashmap_clear_and_free(&set->config_hash, struct config_set_element, ent);
  set->hash_initialized = 0;
  free(set->list.items);
  set->list.nr = 0;
  set->list.alloc = 0;
  set->list.items = NULL;
}

static int config_set_callback(const char *key, const char *value,
             const struct config_context *ctx,
             void *cb)
{
  struct config_set *set = cb;
  configset_add_value(ctx->kvi, set, key, value);
  return 0;
}

int git_configset_add_file(struct config_set *set, const char *filename)
{
  return git_config_from_file(config_set_callback, filename, set);
}

int git_configset_get_value(struct config_set *set, const char *key,
          const char **value, struct key_value_info *kvi)
{
  const struct string_list *values = NULL;
  int ret;
  struct string_list_item item;
  /*
   * Follows "last one wins" semantic, i.e., if there are multiple matches for the
   * queried key in the files of the configset, the value returned will be the last
   * value in the value list for that key.
   */
  if ((ret = git_configset_get_value_multi(set, key, &values)))
    return ret;

  assert(values->nr > 0);
  item = values->items[values->nr - 1];
  *value = item.string;
  if (kvi)
    *kvi = *((struct key_value_info *)item.util);
  return 0;
}

int git_configset_get_value_multi(struct config_set *set, const char *key,
          const struct string_list **dest)
{
  struct config_set_element *e;
  int ret;

  if ((ret = configset_find_element(set, key, &e)))
    return ret;
  else if (!e)
    return 1;
  *dest = &e->value_list;

  return 0;
}

static int check_multi_string(struct string_list_item *item, void *util)
{
  return item->string ? 0 : config_error_nonbool(util);
}

int git_configset_get_string_multi(struct config_set *cs, const char *key,
           const struct string_list **dest)
{
  int ret;

  if ((ret = git_configset_get_value_multi(cs, key, dest)))
    return ret;
  if ((ret = for_each_string_list((struct string_list *)*dest,
          check_multi_string, (void *)key)))
    return ret;

  return 0;
}

int git_configset_get(struct config_set *set, const char *key)
{
  struct config_set_element *e;
  int ret;

  if ((ret = configset_find_element(set, key, &e)))
    return ret;
  else if (!e)
    return 1;
  return 0;
}

int git_configset_get_string(struct config_set *set, const char *key, char **dest)
{
  const char *value;
  if (!git_configset_get_value(set, key, &value, NULL))
    return git_config_string(dest, key, value);
  else
    return 1;
}

static int git_configset_get_string_tmp(struct config_set *set, const char *key,
          const char **dest)
{
  const char *value;
  if (!git_configset_get_value(set, key, &value, NULL)) {
    if (!value)
      return config_error_nonbool(key);
    *dest = value;
    return 0;
  } else {
    return 1;
  }
}

int git_configset_get_int(struct config_set *set, const char *key, int *dest)
{
  const char *value;
  struct key_value_info kvi;

  if (!git_configset_get_value(set, key, &value, &kvi)) {
    *dest = git_config_int(key, value, &kvi);
    return 0;
  } else
    return 1;
}

int git_configset_get_uint(struct config_set *set, const char *key, unsigned int *dest)
{
  const char *value;
  struct key_value_info kvi;

  if (!git_configset_get_value(set, key, &value, &kvi)) {
    *dest = git_config_uint(key, value, &kvi);
    return 0;
  } else
    return 1;
}

int git_configset_get_ulong(struct config_set *set, const char *key, unsigned long *dest)
{
  const char *value;
  struct key_value_info kvi;

  if (!git_configset_get_value(set, key, &value, &kvi)) {
    *dest = git_config_ulong(key, value, &kvi);
    return 0;
  } else
    return 1;
}

int git_configset_get_bool(struct config_set *set, const char *key, int *dest)
{
  const char *value;
  if (!git_configset_get_value(set, key, &value, NULL)) {
    *dest = git_config_bool(key, value);
    return 0;
  } else
    return 1;
}

int git_configset_get_bool_or_int(struct config_set *set, const char *key,
        int *is_bool, int *dest)
{
  const char *value;
  struct key_value_info kvi;

  if (!git_configset_get_value(set, key, &value, &kvi)) {
    *dest = git_config_bool_or_int(key, value, &kvi, is_bool);
    return 0;
  } else
    return 1;
}

int git_configset_get_maybe_bool(struct config_set *set, const char *key, int *dest)
{
  const char *value;
  if (!git_configset_get_value(set, key, &value, NULL)) {
    *dest = git_parse_maybe_bool(value);
    if (*dest == -1)
      return -1;
    return 0;
  } else
    return 1;
}

static int git_configset_get_pathname(struct config_set *set, const char *key, char **dest)
{
  const char *value;
  if (!git_configset_get_value(set, key, &value, NULL))
    return git_config_pathname(dest, key, value);
  else
    return 1;
}

struct comment_char_config {
  unsigned last_key_id;
  bool auto_set;
  bool auto_set_in_file;
  struct strintmap key_flags;
  size_t alloc, nr;
  struct comment_char_config_item {
    unsigned key_id;
    char *path;
    enum config_scope scope;
  } *item;
};

#define COMMENT_CHAR_CFG_INIT {     \
    .key_flags = STRINTMAP_INIT, \
  }

static void comment_char_config_release(struct comment_char_config *config)
{
  strintmap_clear(&config->key_flags);
  for (size_t i = 0; i < config->nr; i++)
    free(config->item[i].path);
  free(config->item);
}

/* Used to track whether the key occurs more than once in a given file */
#define KEY_SEEN_ONCE 1u
#define KEY_SEEN_TWICE 2u
#define COMMENT_KEY_SHIFT(id) (2 * (id))
#define COMMENT_KEY_MASK(id) (3u << COMMENT_KEY_SHIFT(id))

static void set_comment_key_flags(struct comment_char_config *config,
          const char *path, unsigned id, unsigned value)
{
  unsigned old = strintmap_get(&config->key_flags, path);
  unsigned new = (old & ~COMMENT_KEY_MASK(id)) |
        value << COMMENT_KEY_SHIFT(id);

  strintmap_set(&config->key_flags, path, new);
}

static unsigned get_comment_key_flags(struct comment_char_config *config,
              const char *path, unsigned id)
{
  unsigned value = strintmap_get(&config->key_flags, path);

  return (value & COMMENT_KEY_MASK(id)) >> COMMENT_KEY_SHIFT(id);
}

static const char *comment_key_name(unsigned id)
{
  static const char *name[] = {
    "core.commentChar",
    "core.commentString",
  };

  if (id >= ARRAY_SIZE(name))
    BUG("invalid comment key id");

  return name[id];
}

static void comment_char_callback(const char *key, const char *value,
          const struct config_context *ctx, void *data)
{
  struct comment_char_config *config = data;
  const struct key_value_info *kvi = ctx->kvi;
  unsigned key_id;

  if (!strcmp(key, "core.commentchar"))
    key_id = 0;
  else if (!strcmp(key, "core.commentstring"))
    key_id = 1;
  else
    return;

  config->last_key_id = key_id;
  config->auto_set = value && !strcmp(value, "auto");
  if (kvi->origin_type != CONFIG_ORIGIN_FILE) {
    return;
  } else if (get_comment_key_flags(config, kvi->filename, key_id)) {
    set_comment_key_flags(config, kvi->filename, key_id,
              KEY_SEEN_TWICE);
  } else {
    struct comment_char_config_item *item;

    ALLOC_GROW_BY(config->item, config->nr, 1, config->alloc);
    item = &config->item[config->nr - 1];
    item->key_id = key_id;
    item->scope = kvi->scope;
    item->path = xstrdup(kvi->filename);
    set_comment_key_flags(config, kvi->filename, key_id,
              KEY_SEEN_ONCE);
  }
  config->auto_set_in_file = config->auto_set;
}

static void add_config_scope_arg(struct repository *repo, struct strbuf *buf,
         struct comment_char_config_item *item)
{
  char *global_config = git_global_config();
  char *system_config = git_system_config();

  if (item->scope == CONFIG_SCOPE_SYSTEM && access(item->path, W_OK)) {
    /*
     * If the user cannot write to the system config recommend
     * setting the global config instead.
     */
    strbuf_addstr(buf, "--global ");
  } else if (fspatheq(item->path, system_config)) {
    strbuf_addstr(buf, "--system ");
  } else if (fspatheq(item->path, global_config)) {
    strbuf_addstr(buf, "--global ");
  } else if (fspatheq(item->path,
          mkpath("%s/config",
           repo_get_git_dir(repo)))) {
    ; /* --local is the default */
  } else if (fspatheq(item->path,
          mkpath("%s/config.worktree",
           repo_get_common_dir(repo)))) {
    strbuf_addstr(buf, "--worktree ");
  } else {
    const char *path = item->path;
    const char *home = getenv("HOME");

    strbuf_addstr(buf, "--file ");
    if (home && !fspathncmp(path, home, strlen(home))) {
      path += strlen(home);
      if (!fspathncmp(path, "/", 1))
        path++;
      strbuf_addstr(buf, "~/");
    }
    sq_quote_buf_pretty(buf, path);
    strbuf_addch(buf, ' ');
  }

  free(global_config);
  free(system_config);
}

static bool can_unset_comment_char_config(struct comment_char_config *config)
{
  for (size_t i = 0; i < config->nr; i++) {
    struct comment_char_config_item *item = &config->item[i];

    if (item->scope == CONFIG_SCOPE_SYSTEM &&
        access(item->path, W_OK))
      return false;
  }

  return true;
}

static void add_unset_auto_comment_char_advice(struct repository *repo,
                 struct comment_char_config *config)
{
  struct strbuf buf = STRBUF_INIT;

  if (!can_unset_comment_char_config(config))
    return;

  for (size_t i = 0; i < config->nr; i++) {
    struct comment_char_config_item *item = &config->item[i];

    strbuf_addstr(&buf, "    git config unset ");
    add_config_scope_arg(repo, &buf, item);
    if (get_comment_key_flags(config, item->path, item->key_id) == KEY_SEEN_TWICE)
      strbuf_addstr(&buf, "--all ");
    strbuf_addf(&buf, "%s\n", comment_key_name(item->key_id));
  }
  advise(_("\nTo use the default comment string (#) please run\n\n%s"),
         buf.buf);
  strbuf_release(&buf);
}

static void add_comment_char_advice(struct repository *repo,
            struct comment_char_config *config)
{
  struct strbuf buf = STRBUF_INIT;
  struct comment_char_config_item *item;
  /* TRANSLATORS this is a place holder for the value of core.commentString */
  const char *placeholder = _("<comment string>");

  /*
   * If auto is set in the last file that we saw advise the user how to
   * update their config.
   */
  if (!config->auto_set_in_file)
    return;

  add_unset_auto_comment_char_advice(repo, config);
  item = &config->item[config->nr - 1];
  strbuf_reset(&buf);
  strbuf_addstr(&buf, "    git config set ");
  add_config_scope_arg(repo, &buf, item);
  strbuf_addf(&buf, "%s %s\n", comment_key_name(item->key_id),
        placeholder);
  advise(_("\nTo set a custom comment string please run\n\n"
     "%s\nwhere '%s' is the string you wish to use.\n"),
         buf.buf, placeholder);
  strbuf_release(&buf);
}

#undef KEY_SEEN_ONCE
#undef KEY_SEEN_TWICE
#undef COMMENT_KEY_SHIFT
#undef COMMENT_KEY_MASK

struct repo_config {
  struct repository *repo;
  struct comment_char_config comment_char_config;
};

#define REPO_CONFIG_INIT(repo_) {       \
    .comment_char_config = COMMENT_CHAR_CFG_INIT, \
    .repo = repo_,          \
  };

static void repo_config_release(struct repo_config *config)
{
  comment_char_config_release(&config->comment_char_config);
}

#ifdef WITH_BREAKING_CHANGES
static void check_auto_comment_char_config(struct repository *repo,
             struct comment_char_config *config)
{
  if (!config->auto_set)
    return;

  die_message(_("Support for '%s=auto' has been removed in Git 3.0"),
        comment_key_name(config->last_key_id));
  add_comment_char_advice(repo, config);
  die(NULL);
}
#else
static void check_auto_comment_char_config(struct repository *repo,
             struct comment_char_config *config)
{
  extern bool warn_on_auto_comment_char;
  const char *DEPRECATED_CONFIG_ENV =
        "GIT_AUTO_COMMENT_CHAR_CONFIG_WARNING_GIVEN";

  if (!config->auto_set || !warn_on_auto_comment_char)
    return;

  /*
   * Use an environment variable to ensure that subprocesses do not repeat
   * the warning.
   */
  if (git_env_bool(DEPRECATED_CONFIG_ENV, false))
    return;

  setenv(DEPRECATED_CONFIG_ENV, "true", true);

  warning(_("Support for '%s=auto' is deprecated and will be removed in "
      "Git 3.0"), comment_key_name(config->last_key_id));
  add_comment_char_advice(repo, config);
}
#endif /* WITH_BREAKING_CHANGES */

static void check_deprecated_config(struct repo_config *config)
{
  if (!config->repo->check_deprecated_config)
      return;

  check_auto_comment_char_config(config->repo,
               &config->comment_char_config);
}

static int repo_config_callback(const char *key, const char *value,
        const struct config_context *ctx, void *data)
{
  struct repo_config *config = data;

  comment_char_callback(key, value, ctx, &config->comment_char_config);
  return config_set_callback(key, value, ctx, config->repo->config);
}

/* Functions use to read configuration from a repository */
static void repo_read_config(struct repository *repo)
{
  struct config_options opts = { 0 };
  struct repo_config config = REPO_CONFIG_INIT(repo);

  opts.respect_includes = 1;
  opts.commondir = repo->commondir;
  opts.git_dir = repo->gitdir;

  if (!repo->config)
    CALLOC_ARRAY(repo->config, 1);
  else
    git_configset_clear(repo->config);

  git_configset_init(repo->config);
  if (config_with_options(repo_config_callback, &config, NULL, repo,
        &opts) < 0)
    /*
     * config_with_options() normally returns only
     * zero, as most errors are fatal, and
     * non-fatal potential errors are guarded by "if"
     * statements that are entered only when no error is
     * possible.
     *
     * If we ever encounter a non-fatal error, it means
     * something went really wrong and we should stop
     * immediately.
     */
    die(_("unknown error occurred while reading the configuration files"));
  check_deprecated_config(&config);
  repo_config_release(&config);
}

static void git_config_check_init(struct repository *repo)
{
  if (repo->config && repo->config->hash_initialized)
    return;
  repo_read_config(repo);
}

void repo_config_clear(struct repository *repo)
{
  if (!repo->config || !repo->config->hash_initialized)
    return;
  git_configset_clear(repo->config);
}

void repo_config(struct repository *repo, config_fn_t fn, void *data)
{
  if (!repo) {
    read_very_early_config(fn, data);
    return;
  }
  git_config_check_init(repo);
  configset_iter(repo->config, fn, data);
}

int repo_config_get(struct repository *repo, const char *key)
{
  git_config_check_init(repo);
  return git_configset_get(repo->config, key);
}

int repo_config_get_value(struct repository *repo,
        const char *key, const char **value)
{
  git_config_check_init(repo);
  return git_configset_get_value(repo->config, key, value, NULL);
}

int repo_config_get_value_multi(struct repository *repo, const char *key,
        const struct string_list **dest)
{
  git_config_check_init(repo);
  return git_configset_get_value_multi(repo->config, key, dest);
}

int repo_config_get_string_multi(struct repository *repo, const char *key,
         const struct string_list **dest)
{
  git_config_check_init(repo);
  return git_configset_get_string_multi(repo->config, key, dest);
}

int repo_config_get_string(struct repository *repo,
         const char *key, char **dest)
{
  int ret;
  git_config_check_init(repo);
  ret = git_configset_get_string(repo->config, key, dest);
  if (ret < 0)
    git_die_config(repo, key, NULL);
  return ret;
}

int repo_config_get_string_tmp(struct repository *repo,
             const char *key, const char **dest)
{
  int ret;
  git_config_check_init(repo);
  ret = git_configset_get_string_tmp(repo->config, key, dest);
  if (ret < 0)
    git_die_config(repo, key, NULL);
  return ret;
}

int repo_config_get_int(struct repository *repo,
      const char *key, int *dest)
{
  git_config_check_init(repo);
  return git_configset_get_int(repo->config, key, dest);
}

int repo_config_get_uint(struct repository *repo,
       const char *key, unsigned int *dest)
{
  git_config_check_init(repo);
  return git_configset_get_uint(repo->config, key, dest);
}

int repo_config_get_ulong(struct repository *repo,
        const char *key, unsigned long *dest)
{
  git_config_check_init(repo);
  return git_configset_get_ulong(repo->config, key, dest);
}

int repo_config_get_bool(struct repository *repo,
       const char *key, int *dest)
{
  git_config_check_init(repo);
  return git_configset_get_bool(repo->config, key, dest);
}

int repo_config_get_bool_or_int(struct repository *repo,
        const char *key, int *is_bool, int *dest)
{
  git_config_check_init(repo);
  return git_configset_get_bool_or_int(repo->config, key, is_bool, dest);
}

int repo_config_get_maybe_bool(struct repository *repo,
             const char *key, int *dest)
{
  git_config_check_init(repo);
  return git_configset_get_maybe_bool(repo->config, key, dest);
}

int repo_config_get_pathname(struct repository *repo,
           const char *key, char **dest)
{
  int ret;
  git_config_check_init(repo);
  ret = git_configset_get_pathname(repo->config, key, dest);
  if (ret < 0)
    git_die_config(repo, key, NULL);
  return ret;
}

/* Read values into protected_config. */
static void read_protected_config(void)
{
  struct config_options opts = {
    .respect_includes = 1,
    .ignore_repo = 1,
    .ignore_worktree = 1,
    .system_gently = 1,
  };

  git_configset_init(&protected_config);
  config_with_options(config_set_callback, &protected_config, NULL,
          NULL, &opts);
}

void git_protected_config(config_fn_t fn, void *data)
{
  if (!protected_config.hash_initialized)
    read_protected_config();
  configset_iter(&protected_config, fn, data);
}

int repo_config_get_expiry(struct repository *r, const char *key, char **output)
{
  int ret = repo_config_get_string(r, key, output);

  if (ret)
    return ret;
  if (strcmp(*output, "now")) {
    timestamp_t now = approxidate("now");
    if (approxidate(*output) >= now)
      git_die_config(r, key, _("Invalid %s: '%s'"), key, *output);
  }
  return ret;
}

int repo_config_get_expiry_in_days(struct repository *r, const char *key,
           timestamp_t *expiry, timestamp_t now)
{
  const char *expiry_string;
  int days;
  timestamp_t when;

  if (repo_config_get_string_tmp(r, key, &expiry_string))
    return 1; /* no such thing */

  if (git_parse_int(expiry_string, &days)) {
    const intmax_t scale = 86400;
    *expiry = now - days * scale;
    return 0;
  }

  if (!parse_expiry_date(expiry_string, &when)) {
    *expiry = when;
    return 0;
  }
  return -1; /* thing exists but cannot be parsed */
}

int repo_config_get_split_index(struct repository *r)
{
  int val;

  if (!repo_config_get_maybe_bool(r, "core.splitindex", &val))
    return val;

  return -1; /* default value */
}

int repo_config_get_max_percent_split_change(struct repository *r)
{
  int val = -1;

  if (!repo_config_get_int(r, "splitindex.maxpercentchange", &val)) {
    if (0 <= val && val <= 100)
      return val;

    return error(_("splitIndex.maxPercentChange value '%d' "
             "should be between 0 and 100"), val);
  }

  return -1; /* default value */
}

int repo_config_get_index_threads(struct repository *r, int *dest)
{
  int is_bool, val;

  val = git_env_ulong("GIT_TEST_INDEX_THREADS", 0);
  if (val) {
    *dest = val;
    return 0;
  }

  if (!repo_config_get_bool_or_int(r, "index.threads", &is_bool, &val)) {
    if (is_bool)
      *dest = val ? 0 : 1;
    else
      *dest = val;
    return 0;
  }

  return 1;
}

NORETURN
void git_die_config_linenr(const char *key, const char *filename, int linenr)
{
  if (!filename)
    die(_("unable to parse '%s' from command-line config"), key);
  else
    die(_("bad config variable '%s' in file '%s' at line %d"),
        key, filename, linenr);
}

void git_die_config(struct repository *r, const char *key, const char *err, ...)
{
  const struct string_list *values;
  struct key_value_info *kv_info;
  report_fn error_fn = get_error_routine();

  if (err) {
    va_list params;
    va_start(params, err);
    error_fn(err, params);
    va_end(params);
  }
  if (repo_config_get_value_multi(r, key, &values))
    BUG("for key '%s' we must have a value to report on", key);
  kv_info = values->items[values->nr - 1].util;
  git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
}

/*
 * Find all the stuff for repo_config_set() below.
 */

struct config_store_data {
  size_t baselen;
  char *key;
  int do_not_match;
  const char *fixed_value;
  regex_t *value_pattern;
  int multi_replace;
  struct {
    size_t begin, end;
    enum config_event_t type;
    int is_keys_section;
  } *parsed;
  unsigned int parsed_nr, parsed_alloc, *seen, seen_nr, seen_alloc;
  unsigned int key_seen:1, section_seen:1, is_keys_section:1;
};
#define CONFIG_STORE_INIT { 0 }

static void config_store_data_clear(struct config_store_data *store)
{
  free(store->key);
  if (store->value_pattern != NULL &&
      store->value_pattern != CONFIG_REGEX_NONE) {
    regfree(store->value_pattern);
    free(store->value_pattern);
  }
  free(store->parsed);
  free(store->seen);
  memset(store, 0, sizeof(*store));
}

static int matches(const char *key, const char *value,
       const struct config_store_data *store)
{
  if (strcmp(key, store->key))
    return 0; /* not ours */
  if (store->fixed_value && value)
    return !strcmp(store->fixed_value, value);
  if (!store->value_pattern)
    return 1; /* always matches */
  if (store->value_pattern == CONFIG_REGEX_NONE)
    return 0; /* never matches */

  return store->do_not_match ^
    (value && !regexec(store->value_pattern, value, 0, NULL, 0));
}

static int store_aux_event(enum config_event_t type, size_t begin, size_t end,
         struct config_source *cs, void *data)
{
  struct config_store_data *store = data;

  ALLOC_GROW(store->parsed, store->parsed_nr + 1, store->parsed_alloc);
  store->parsed[store->parsed_nr].begin = begin;
  store->parsed[store->parsed_nr].end = end;
  store->parsed[store->parsed_nr].type = type;

  if (type == CONFIG_EVENT_SECTION) {
    int (*cmpfn)(const char *, const char *, size_t);

    if (cs->var.len < 2 || cs->var.buf[cs->var.len - 1] != '.')
      return error(_("invalid section name '%s'"), cs->var.buf);

    if (cs->subsection_case_sensitive)
      cmpfn = strncasecmp;
    else
      cmpfn = strncmp;

    /* Is this the section we were looking for? */
    store->is_keys_section =
      store->parsed[store->parsed_nr].is_keys_section =
      cs->var.len - 1 == store->baselen &&
      !cmpfn(cs->var.buf, store->key, store->baselen);
    if (store->is_keys_section) {
      store->section_seen = 1;
      ALLOC_GROW(store->seen, store->seen_nr + 1,
           store->seen_alloc);
      store->seen[store->seen_nr] = store->parsed_nr;
    }
  }

  store->parsed_nr++;

  return 0;
}

static int store_aux(const char *key, const char *value,
         const struct config_context *ctx UNUSED, void *cb)
{
  struct config_store_data *store = cb;

  if (store->key_seen) {
    if (matches(key, value, store)) {
      if (store->seen_nr == 1 && store->multi_replace == 0) {
        warning(_("%s has multiple values"), key);
      }

      ALLOC_GROW(store->seen, store->seen_nr + 1,
           store->seen_alloc);

      store->seen[store->seen_nr] = store->parsed_nr;
      store->seen_nr++;
    }
  } else if (store->is_keys_section) {
    /*
     * Do not increment matches yet: this may not be a match, but we
     * are in the desired section.
     */
    ALLOC_GROW(store->seen, store->seen_nr + 1, store->seen_alloc);
    store->seen[store->seen_nr] = store->parsed_nr;
    store->section_seen = 1;

    if (matches(key, value, store)) {
      store->seen_nr++;
      store->key_seen = 1;
    }
  }

  return 0;
}

static int write_error(const char *filename)
{
  error(_("failed to write new configuration file %s"), filename);

  /* Same error code as "failed to rename". */
  return 4;
}

static struct strbuf store_create_section(const char *key,
            const struct config_store_data *store)
{
  const char *dot;
  size_t i;
  struct strbuf sb = STRBUF_INIT;

  dot = memchr(key, '.', store->baselen);
  if (dot) {
    strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
    for (i = dot - key + 1; i < store->baselen; i++) {
      if (key[i] == '"' || key[i] == '\\')
        strbuf_addch(&sb, '\\');
      strbuf_addch(&sb, key[i]);
    }
    strbuf_addstr(&sb, "\"]\n");
  } else {
    strbuf_addch(&sb, '[');
    strbuf_add(&sb, key, store->baselen);
    strbuf_addstr(&sb, "]\n");
  }

  return sb;
}

static ssize_t write_section(int fd, const char *key,
           const struct config_store_data *store)
{
  struct strbuf sb = store_create_section(key, store);
  ssize_t ret;

  ret = write_in_full(fd, sb.buf, sb.len);
  strbuf_release(&sb);

  return ret;
}

static ssize_t write_pair(int fd, const char *key, const char *value,
        const char *comment,
        const struct config_store_data *store)
{
  int i;
  ssize_t ret;
  const char *quote = "";
  struct strbuf sb = STRBUF_INIT;

  /*
   * Check to see if the value needs to be surrounded with a dq pair.
   * Note that problematic characters are always backslash-quoted; this
   * check is about not losing leading or trailing SP and strings that
   * follow beginning-of-comment characters (i.e. ';' and '#') by the
   * configuration parser.
   */
  if (value[0] == ' ')
    quote = "\"";
  for (i = 0; value[i]; i++)
    if (value[i] == ';' || value[i] == '#' || value[i] == '\r')
      quote = "\"";
  if (i && value[i - 1] == ' ')
    quote = "\"";

  strbuf_addf(&sb, "\t%s = %s", key + store->baselen + 1, quote);

  for (i = 0; value[i]; i++)
    switch (value[i]) {
    case '\n':
      strbuf_addstr(&sb, "\\n");
      break;
    case '\t':
      strbuf_addstr(&sb, "\\t");
      break;
    case '"':
    case '\\':
      strbuf_addch(&sb, '\\');
      /* fallthrough */
    default:
      strbuf_addch(&sb, value[i]);
      break;
    }

  if (comment)
    strbuf_addf(&sb, "%s%s\n", quote, comment);
  else
    strbuf_addf(&sb, "%s\n", quote);

  ret = write_in_full(fd, sb.buf, sb.len);
  strbuf_release(&sb);

  return ret;
}

/*
 * If we are about to unset the last key(s) in a section, and if there are
 * no comments surrounding (or included in) the section, we will want to
 * extend begin/end to remove the entire section.
 *
 * Note: the parameter `seen_ptr` points to the index into the store.seen
 * array.  * This index may be incremented if a section has more than one
 * entry (which all are to be removed).
 */
static void maybe_remove_section(struct config_store_data *store,
         size_t *begin_offset, size_t *end_offset,
         unsigned *seen_ptr)
{
  size_t begin;
  int section_seen = 0;
  unsigned int i, seen;

  /*
   * First, ensure that this is the first key, and that there are no
   * comments before the entry nor before the section header.
   */
  seen = *seen_ptr;
  for (i = store->seen[seen]; i > 0; i--) {
    enum config_event_t type = store->parsed[i - 1].type;

    if (type == CONFIG_EVENT_COMMENT)
      /* There is a comment before this entry or section */
      return;
    if (type == CONFIG_EVENT_ENTRY) {
      if (!section_seen)
        /* This is not the section's first entry. */
        return;
      /* We encountered no comment before the section. */
      break;
    }
    if (type == CONFIG_EVENT_SECTION) {
      if (!store->parsed[i - 1].is_keys_section)
        break;
      section_seen = 1;
    }
  }
  begin = store->parsed[i].begin;

  /*
   * Next, make sure that we are removing the last key(s) in the section,
   * and that there are no comments that are possibly about the current
   * section.
   */
  for (i = store->seen[seen] + 1; i < store->parsed_nr; i++) {
    enum config_event_t type = store->parsed[i].type;

    if (type == CONFIG_EVENT_COMMENT)
      return;
    if (type == CONFIG_EVENT_SECTION) {
      if (store->parsed[i].is_keys_section)
        continue;
      break;
    }
    if (type == CONFIG_EVENT_ENTRY) {
      if (++seen < store->seen_nr &&
          i == store->seen[seen])
        /* We want to remove this entry, too */
        continue;
      /* There is another entry in this section. */
      return;
    }
  }

  /*
   * We are really removing the last entry/entries from this section, and
   * there are no enclosed or surrounding comments. Remove the entire,
   * now-empty section.
   */
  *seen_ptr = seen;
  *begin_offset = begin;
  if (i < store->parsed_nr)
    *end_offset = store->parsed[i].begin;
  else
    *end_offset = store->parsed[store->parsed_nr - 1].end;
}

int repo_config_set_in_file_gently(struct repository *r, const char *config_filename,
           const char *key, const char *comment, const char *value)
{
  return repo_config_set_multivar_in_file_gently(r, config_filename, key, value, NULL, comment, 0);
}

void repo_config_set_in_file(struct repository *r, const char *config_filename,
           const char *key, const char *value)
{
  repo_config_set_multivar_in_file(r, config_filename, key, value, NULL, 0);
}

int repo_config_set_gently(struct repository *r, const char *key, const char *value)
{
  return repo_config_set_multivar_gently(r, key, value, NULL, 0);
}

int repo_config_set_worktree_gently(struct repository *r,
            const char *key, const char *value)
{
  /* Only use worktree-specific config if it is already enabled. */
  if (r->repository_format_worktree_config) {
    char *file = repo_git_path(r, "config.worktree");
    int ret = repo_config_set_multivar_in_file_gently(
          r, file, key, value, NULL, NULL, 0);
    free(file);
    return ret;
  }
  return repo_config_set_multivar_gently(r, key, value, NULL, 0);
}

void repo_config_set(struct repository *r, const char *key, const char *value)
{
  repo_config_set_multivar(r, key, value, NULL, 0);

  trace2_cmd_set_config(key, value);
}

char *git_config_prepare_comment_string(const char *comment)
{
  size_t leading_blanks;
  char *prepared;

  if (!comment)
    return NULL;

  if (strchr(comment, '\n'))
    die(_("no multi-line comment allowed: '%s'"), comment);

  /*
   * If it begins with one or more leading whitespace characters
   * followed by '#", the comment string is used as-is.
   *
   * If it begins with '#', a SP is inserted between the comment
   * and the value the comment is about.
   *
   * Otherwise, the value is followed by a SP followed by '#'
   * followed by SP and then the comment string comes.
   */

  leading_blanks = strspn(comment, " \t");
  if (leading_blanks && comment[leading_blanks] == '#')
    prepared = xstrdup(comment); /* use it as-is */
  else if (comment[0] == '#')
    prepared = xstrfmt(" %s", comment);
  else
    prepared = xstrfmt(" # %s", comment);

  return prepared;
}

/*
 * How long to retry acquiring config.lock when another process holds
 * it. Default matches core.packedRefsTimeout; override via
 * core.configLockTimeout.
 */
static long config_lock_timeout_ms(struct repository *r)
{
  static int configured;
  static int timeout_ms = 1000;

  if (!configured) {
    repo_config_get_int(r, "core.configlocktimeout", &timeout_ms);
    configured = 1;
  }

  return timeout_ms;
}

static void validate_comment_string(const char *comment)
{
  size_t leading_blanks;

  if (!comment)
    return;
  /*
   * The front-end must have massaged the comment string
   * properly before calling us.
   */
  if (strchr(comment, '\n'))
    BUG("multi-line comments are not permitted: '%s'", comment);

  leading_blanks = strspn(comment, " \t");
  if (!leading_blanks || comment[leading_blanks] != '#')
    BUG("comment must begin with one or more SP followed by '#': '%s'",
        comment);
}

/*
 * If value==NULL, unset in (remove from) config,
 * if value_pattern!=NULL, disregard key/value pairs where value does not match.
 * if value_pattern==CONFIG_REGEX_NONE, do not match any existing values
 *     (only add a new one)
 * if flags contains the CONFIG_FLAGS_MULTI_REPLACE flag, all matching
 *     key/values are removed before a single new pair is written. If the
 *     flag is not present, then replace only the first match.
 *
 * Returns 0 on success.
 *
 * This function does this:
 *
 * - it locks the config file by creating ".git/config.lock"
 *
 * - it then parses the config using store_aux() as validator to find
 *   the position on the key/value pair to replace. If it is to be unset,
 *   it must be found exactly once.
 *
 * - the config file is mmap()ed and the part before the match (if any) is
 *   written to the lock file, then the changed part and the rest.
 *
 * - the config file is removed and the lock file rename()d to it.
 *
 */
int repo_config_set_multivar_in_file_gently(struct repository *r,
              const char *config_filename,
              const char *key, const char *value,
              const char *value_pattern,
              const char *comment,
              unsigned flags)
{
  int fd = -1, in_fd = -1;
  int ret;
  struct lock_file lock = LOCK_INIT;
  char *filename_buf = NULL;
  char *contents = NULL;
  size_t contents_sz;
  struct config_store_data store = CONFIG_STORE_INIT;
  bool saved_check_deprecated_config = r->check_deprecated_config;

  /*
   * Do not warn or die if there are deprecated config settings as
   * we want the user to be able to change those settings by running
   * "git config".
   */
  r->check_deprecated_config = false;

  validate_comment_string(comment);

  /* parse-key returns negative; flip the sign to feed exit(3) */
  ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
  if (ret)
    goto out_free;

  store.multi_replace = (flags & CONFIG_FLAGS_MULTI_REPLACE) != 0;

  if (!config_filename)
    config_filename = filename_buf = repo_git_path(r, "config");

  /*
   * The lock serves a purpose in addition to locking: the new
   * contents of .git/config will be written into it.
   */
  fd = repo_hold_lock_file_for_update_timeout(r, &lock, config_filename, 0,
                config_lock_timeout_ms(r));
  if (fd < 0) {
    error_errno(_("could not lock config file %s"), config_filename);
    ret = CONFIG_NO_LOCK;
    goto out_free;
  }

  /*
   * If .git/config does not exist yet, write a minimal version.
   */
  in_fd = open(config_filename, O_RDONLY);
  if ( in_fd < 0 ) {
    if ( ENOENT != errno ) {
      error_errno(_("opening %s"), config_filename);
      ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
      goto out_free;
    }
    /* if nothing to unset, error out */
    if (!value) {
      ret = CONFIG_NOTHING_SET;
      goto out_free;
    }

    free(store.key);
    store.key = xstrdup(key);
    if (write_section(fd, key, &store) < 0 ||
        write_pair(fd, key, value, comment, &store) < 0)
      goto write_err_out;
  } else {
    struct stat st;
    size_t copy_begin, copy_end;
    unsigned i;
    int new_line = 0;
    struct config_options opts;

    if (!value_pattern)
      store.value_pattern = NULL;
    else if (value_pattern == CONFIG_REGEX_NONE)
      store.value_pattern = CONFIG_REGEX_NONE;
    else if (flags & CONFIG_FLAGS_FIXED_VALUE)
      store.fixed_value = value_pattern;
    else {
      if (value_pattern[0] == '!') {
        store.do_not_match = 1;
        value_pattern++;
      } else
        store.do_not_match = 0;

      store.value_pattern = (regex_t*)xmalloc(sizeof(regex_t));
      if (regcomp(store.value_pattern, value_pattern,
          REG_EXTENDED)) {
        error(_("invalid pattern: %s"), value_pattern);
        FREE_AND_NULL(store.value_pattern);
        ret = CONFIG_INVALID_PATTERN;
        goto out_free;
      }
    }

    ALLOC_GROW(store.parsed, 1, store.parsed_alloc);
    store.parsed[0].end = 0;

    memset(&opts, 0, sizeof(opts));
    opts.event_fn = store_aux_event;
    opts.event_fn_data = &store;

    /*
     * After this, store.parsed will contain offsets of all the
     * parsed elements, and store.seen will contain a list of
     * matches, as indices into store.parsed.
     *
     * As a side effect, we make sure to transform only a valid
     * existing config file.
     */
    if (git_config_from_file_with_options(store_aux,
                  config_filename,
                  &store, CONFIG_SCOPE_UNKNOWN,
                  &opts)) {
      error(_("invalid config file %s"), config_filename);
      ret = CONFIG_INVALID_FILE;
      goto out_free;
    }

    /* if nothing to unset, or too many matches, error out */
    if ((store.seen_nr == 0 && value == NULL) ||
        (store.seen_nr > 1 && !store.multi_replace)) {
      ret = CONFIG_NOTHING_SET;
      goto out_free;
    }

    if (fstat(in_fd, &st) == -1) {
      error_errno(_("fstat on %s failed"), config_filename);
      ret = CONFIG_INVALID_FILE;
      goto out_free;
    }

    contents_sz = xsize_t(st.st_size);
    contents = xmmap_gently(NULL, contents_sz, PROT_READ,
          MAP_PRIVATE, in_fd, 0);
    if (contents == MAP_FAILED) {
      if (errno == ENODEV && S_ISDIR(st.st_mode))
        errno = EISDIR;
      error_errno(_("unable to mmap '%s'%s"),
          config_filename, mmap_os_err());
      ret = CONFIG_INVALID_FILE;
      contents = NULL;
      goto out_free;
    }
    close(in_fd);
    in_fd = -1;

    if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
      error_errno(_("chmod on %s failed"), get_lock_file_path(&lock));
      ret = CONFIG_NO_WRITE;
      goto out_free;
    }

    if (store.seen_nr == 0) {
      if (!store.seen_alloc) {
        /* Did not see key nor section */
        ALLOC_GROW(store.seen, 1, store.seen_alloc);
        store.seen[0] = store.parsed_nr
          - !!store.parsed_nr;
      }
      store.seen_nr = 1;
    }

    for (i = 0, copy_begin = 0; i < store.seen_nr; i++) {
      size_t replace_end;
      int j = store.seen[i];

      new_line = 0;
      if (!store.key_seen) {
        copy_end = store.parsed[j].end;
        /* include '\n' when copying section header */
        if (copy_end > 0 && copy_end < contents_sz &&
            contents[copy_end - 1] != '\n' &&
            contents[copy_end] == '\n')
          copy_end++;
        replace_end = copy_end;
      } else {
        replace_end = store.parsed[j].end;
        copy_end = store.parsed[j].begin;
        if (!value)
          maybe_remove_section(&store,
                   &copy_end,
                   &replace_end, &i);
        /*
         * Swallow preceding white-space on the same
         * line.
         */
        while (copy_end > 0 ) {
          char c = contents[copy_end - 1];

          if (isspace(c) && c != '\n')
            copy_end--;
          else
            break;
        }
      }

      if (copy_end > 0 && contents[copy_end-1] != '\n')
        new_line = 1;

      /* write the first part of the config */
      if (copy_end > copy_begin) {
        if (write_in_full(fd, contents + copy_begin,
              copy_end - copy_begin) < 0)
          goto write_err_out;
        if (new_line &&
            write_str_in_full(fd, "\n") < 0)
          goto write_err_out;
      }
      copy_begin = replace_end;
    }

    /* write the pair (value == NULL means unset) */
    if (value) {
      if (!store.section_seen) {
        if (write_section(fd, key, &store) < 0)
          goto write_err_out;
      }
      if (write_pair(fd, key, value, comment, &store) < 0)
        goto write_err_out;
    }

    /* write the rest of the config */
    if (copy_begin < contents_sz)
      if (write_in_full(fd, contents + copy_begin,
            contents_sz - copy_begin) < 0)
        goto write_err_out;

    munmap(contents, contents_sz);
    contents = NULL;
  }

  if (commit_lock_file(&lock) < 0) {
    error_errno(_("could not write config file %s"), config_filename);
    ret = CONFIG_NO_WRITE;
    goto out_free;
  }

  ret = 0;

  /* Invalidate the config cache */
  repo_config_clear(r);

out_free:
  rollback_lock_file(&lock);
  free(filename_buf);
  if (contents)
    munmap(contents, contents_sz);
  if (in_fd >= 0)
    close(in_fd);
  config_store_data_clear(&store);
  r->check_deprecated_config = saved_check_deprecated_config;
  return ret;

write_err_out:
  ret = write_error(get_lock_file_path(&lock));
  goto out_free;
}

void repo_config_set_multivar_in_file(struct repository *r,
              const char *config_filename,
              const char *key, const char *value,
              const char *value_pattern, unsigned flags)
{
  if (!repo_config_set_multivar_in_file_gently(r, config_filename, key, value,
                 value_pattern, NULL, flags))
    return;
  if (value)
    die(_("could not set '%s' to '%s'"), key, value);
  else
    die(_("could not unset '%s'"), key);
}

int repo_config_set_multivar_gently(struct repository *r, const char *key,
            const char *value,
            const char *value_pattern, unsigned flags)
{
  char *file = repo_git_path(r, "config");
  int res = repo_config_set_multivar_in_file_gently(r, file,
                key, value,
                value_pattern,
                NULL, flags);
  free(file);
  return res;
}

void repo_config_set_multivar(struct repository *r,
            const char *key, const char *value,
            const char *value_pattern, unsigned flags)
{
  char *file = repo_git_path(r, "config");
  repo_config_set_multivar_in_file(r, file, key, value,
           value_pattern, flags);
  free(file);
}

static size_t section_name_match (const char *buf, const char *name)
{
  size_t i = 0, j = 0;
  int dot = 0;
  if (buf[i] != '[')
    return 0;
  for (i = 1; buf[i] && buf[i] != ']'; i++) {
    if (!dot && isspace(buf[i])) {
      dot = 1;
      if (name[j++] != '.')
        break;
      for (i++; isspace(buf[i]); i++)
        ; /* do nothing */
      if (buf[i] != '"')
        break;
      continue;
    }
    if (buf[i] == '\\' && dot)
      i++;
    else if (buf[i] == '"' && dot) {
      for (i++; isspace(buf[i]); i++)
        ; /* do_nothing */
      break;
    }
    if (buf[i] != name[j++])
      break;
  }
  if (buf[i] == ']' && name[j] == 0) {
    /*
     * We match, now just find the right length offset by
     * gobbling up any whitespace after it, as well
     */
    i++;
    for (; buf[i] && isspace(buf[i]); i++)
      ; /* do nothing */
    return i;
  }
  return 0;
}

static int section_name_is_ok(const char *name)
{
  /* Empty section names are bogus. */
  if (!*name)
    return 0;

  /*
   * Before a dot, we must be alphanumeric or dash. After the first dot,
   * anything goes, so we can stop checking.
   */
  for (; *name && *name != '.'; name++)
    if (*name != '-' && !isalnum(*name))
      return 0;
  return 1;
}

#define GIT_CONFIG_MAX_LINE_LEN (512 * 1024)

/* if new_name == NULL, the section is removed instead */
static int repo_config_copy_or_rename_section_in_file(
  struct repository *r,
  const char *config_filename,
  const char *old_name,
  const char *new_name, int copy)
{
  int ret = 0, remove = 0;
  char *filename_buf = NULL;
  struct lock_file lock = LOCK_INIT;
  int out_fd;
  struct strbuf buf = STRBUF_INIT;
  FILE *config_file = NULL;
  struct stat st;
  struct strbuf copystr = STRBUF_INIT;
  struct config_store_data store;
  uint32_t line_nr = 0;

  memset(&store, 0, sizeof(store));

  if (new_name && !section_name_is_ok(new_name)) {
    ret = error(_("invalid section name: %s"), new_name);
    goto out_no_rollback;
  }

  if (!config_filename)
    config_filename = filename_buf = repo_git_path(r, "config");

  out_fd = repo_hold_lock_file_for_update_timeout(r, &lock,
              config_filename, 0,
              config_lock_timeout_ms(r));
  if (out_fd < 0) {
    ret = error(_("could not lock config file %s"), config_filename);
    goto out;
  }

  if (!(config_file = fopen(config_filename, "rb"))) {
    ret = warn_on_fopen_errors(config_filename);
    if (ret)
      goto out;
    /* no config file means nothing to rename, no error */
    goto commit_and_out;
  }

  if (fstat(fileno(config_file), &st) == -1) {
    ret = error_errno(_("fstat on %s failed"), config_filename);
    goto out;
  }

  if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
    ret = error_errno(_("chmod on %s failed"),
          get_lock_file_path(&lock));
    goto out;
  }

  while (!strbuf_getwholeline(&buf, config_file, '\n')) {
    size_t i, length;
    int is_section = 0;
    char *output = buf.buf;

    line_nr++;

    if (buf.len >= GIT_CONFIG_MAX_LINE_LEN) {
      ret = error(_("refusing to work with overly long line "
              "in '%s' on line %"PRIuMAX),
            config_filename, (uintmax_t)line_nr);
      goto out;
    }

    for (i = 0; buf.buf[i] && isspace(buf.buf[i]); i++)
      ; /* do nothing */
    if (buf.buf[i] == '[') {
      /* it's a section */
      size_t offset;
      is_section = 1;

      /*
       * When encountering a new section under -c we
       * need to flush out any section we're already
       * coping and begin anew. There might be
       * multiple [branch "$name"] sections.
       */
      if (copystr.len > 0) {
        if (write_in_full(out_fd, copystr.buf, copystr.len) < 0) {
          ret = write_error(get_lock_file_path(&lock));
          goto out;
        }
        strbuf_reset(&copystr);
      }

      offset = section_name_match(&buf.buf[i], old_name);
      if (offset > 0) {
        ret++;
        if (!new_name) {
          remove = 1;
          continue;
        }
        store.baselen = strlen(new_name);
        if (!copy) {
          if (write_section(out_fd, new_name, &store) < 0) {
            ret = write_error(get_lock_file_path(&lock));
            goto out;
          }
          /*
           * We wrote out the new section, with
           * a newline, now skip the old
           * section's length
           */
          output += offset + i;
          if (strlen(output) > 0) {
            /*
             * More content means there's
             * a declaration to put on the
             * next line; indent with a
             * tab
             */
            output -= 1;
            output[0] = '\t';
          }
        } else {
          strbuf_release(&copystr);
          copystr = store_create_section(new_name, &store);
        }
      }
      remove = 0;
    }
    if (remove)
      continue;
    length = strlen(output);

    if (!is_section && copystr.len > 0) {
      strbuf_add(&copystr, output, length);
    }

    if (write_in_full(out_fd, output, length) < 0) {
      ret = write_error(get_lock_file_path(&lock));
      goto out;
    }
  }

  /*
   * Copy a trailing section at the end of the config, won't be
   * flushed by the usual "flush because we have a new section
   * logic in the loop above.
   */
  if (copystr.len > 0) {
    if (write_in_full(out_fd, copystr.buf, copystr.len) < 0) {
      ret = write_error(get_lock_file_path(&lock));
      goto out;
    }
    strbuf_reset(&copystr);
  }

  fclose(config_file);
  config_file = NULL;
commit_and_out:
  if (commit_lock_file(&lock) < 0)
    ret = error_errno(_("could not write config file %s"),
          config_filename);
out:
  if (config_file)
    fclose(config_file);
  rollback_lock_file(&lock);
out_no_rollback:
  free(filename_buf);
  config_store_data_clear(&store);
  strbuf_release(&buf);
  strbuf_release(&copystr);
  return ret;
}

int repo_config_rename_section_in_file(struct repository *r, const char *config_filename,
               const char *old_name, const char *new_name)
{
  return repo_config_copy_or_rename_section_in_file(r, config_filename,
           old_name, new_name, 0);
}

int repo_config_rename_section(struct repository *r, const char *old_name, const char *new_name)
{
  return repo_config_rename_section_in_file(r, NULL, old_name, new_name);
}

int repo_config_copy_section_in_file(struct repository *r, const char *config_filename,
             const char *old_name, const char *new_name)
{
  return repo_config_copy_or_rename_section_in_file(r, config_filename,
           old_name, new_name, 1);
}

int repo_config_copy_section(struct repository *r, const char *old_name, const char *new_name)
{
  return repo_config_copy_section_in_file(r, NULL, old_name, new_name);
}

/*
 * Call this to report error for your variable that should not
 * get a boolean value (i.e. "[my] var" means "true").
 */
#undef config_error_nonbool
int config_error_nonbool(const char *var)
{
  return error(_("missing value for '%s'"), var);
}

int parse_config_key(const char *var,
         const char *section,
         const char **subsection, size_t *subsection_len,
         const char **key)
{
  const char *dot;

  /* Does it start with "section." ? */
  if (!skip_prefix(var, section, &var) || *var != '.')
    return -1;

  /*
   * Find the key; we don't know yet if we have a subsection, but we must
   * parse backwards from the end, since the subsection may have dots in
   * it, too.
   */
  dot = strrchr(var, '.');
  *key = dot + 1;

  /* Did we have a subsection at all? */
  if (dot == var) {
    if (subsection) {
      *subsection = NULL;
      *subsection_len = 0;
    }
  }
  else {
    if (!subsection)
      return -1;
    *subsection = var + 1;
    *subsection_len = dot - *subsection;
  }

  return 0;
}

const char *config_origin_type_name(enum config_origin_type type)
{
  switch (type) {
  case CONFIG_ORIGIN_BLOB:
    return "blob";
  case CONFIG_ORIGIN_FILE:
    return "file";
  case CONFIG_ORIGIN_STDIN:
    return "standard input";
  case CONFIG_ORIGIN_SUBMODULE_BLOB:
    return "submodule-blob";
  case CONFIG_ORIGIN_CMDLINE:
    return "command line";
  default:
    BUG("unknown config origin type");
  }
}

const char *config_scope_name(enum config_scope scope)
{
  switch (scope) {
  case CONFIG_SCOPE_SYSTEM:
    return "system";
  case CONFIG_SCOPE_GLOBAL:
    return "global";
  case CONFIG_SCOPE_LOCAL:
    return "local";
  case CONFIG_SCOPE_WORKTREE:
    return "worktree";
  case CONFIG_SCOPE_COMMAND:
    return "command";
  case CONFIG_SCOPE_SUBMODULE:
    return "submodule";
  default:
    return "unknown";
  }
}

int lookup_config(const char **mapping, int nr_mapping, const char *var)
{
  int i;

  for (i = 0; i < nr_mapping; i++) {
    const char *name = mapping[i];

    if (name && !strcasecmp(var, name))
      return i;
  }
  return -1;
}

Coverage Report

Created: 2026-10-17 07:15