/src/libgit2/src/libgit2/config.c

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/*
 * Copyright (C) the libgit2 contributors. All rights reserved.
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */

#include "config.h"

#include "git2/config.h"
#include "git2/sys/config.h"

#include "buf.h"
#include "config_backend.h"
#include "regexp.h"
#include "sysdir.h"
#include "transaction.h"
#include "vector.h"
#if GIT_WIN32
# include <windows.h>
#endif

#include <ctype.h>

void git_config_entry_free(git_config_entry *entry)
{
  if (!entry)
    return;

  entry->free(entry);
}

typedef struct {
  git_refcount rc;

  git_config_backend *backend;
  git_config_level_t level;
} backend_internal;

static void backend_internal_free(backend_internal *internal)
{
  git_config_backend *backend;

  backend = internal->backend;
  backend->free(backend);
  git__free(internal);
}

static void config_free(git_config *cfg)
{
  size_t i;
  backend_internal *internal;

  for (i = 0; i < cfg->backends.length; ++i) {
    internal = git_vector_get(&cfg->backends, i);
    GIT_REFCOUNT_DEC(internal, backend_internal_free);
  }

  git_vector_free(&cfg->backends);

  git__memzero(cfg, sizeof(*cfg));
  git__free(cfg);
}

void git_config_free(git_config *cfg)
{
  if (cfg == NULL)
    return;

  GIT_REFCOUNT_DEC(cfg, config_free);
}

static int config_backend_cmp(const void *a, const void *b)
{
  const backend_internal *bk_a = (const backend_internal *)(a);
  const backend_internal *bk_b = (const backend_internal *)(b);

  return bk_b->level - bk_a->level;
}

int git_config_new(git_config **out)
{
  git_config *cfg;

  cfg = git__malloc(sizeof(git_config));
  GIT_ERROR_CHECK_ALLOC(cfg);

  memset(cfg, 0x0, sizeof(git_config));

  if (git_vector_init(&cfg->backends, 3, config_backend_cmp) < 0) {
    git__free(cfg);
    return -1;
  }

  *out = cfg;
  GIT_REFCOUNT_INC(cfg);
  return 0;
}

int git_config_add_file_ondisk(
  git_config *cfg,
  const char *path,
  git_config_level_t level,
  const git_repository *repo,
  int force)
{
  git_config_backend *file = NULL;
  struct stat st;
  int res;

  GIT_ASSERT_ARG(cfg);
  GIT_ASSERT_ARG(path);

  res = p_stat(path, &st);
  if (res < 0 && errno != ENOENT && errno != ENOTDIR) {
    git_error_set(GIT_ERROR_CONFIG, "failed to stat '%s'", path);
    return -1;
  }

  if (git_config_backend_from_file(&file, path) < 0)
    return -1;

  if ((res = git_config_add_backend(cfg, file, level, repo, force)) < 0) {
    /*
     * free manually; the file is not owned by the config
     * instance yet and will not be freed on cleanup
     */
    file->free(file);
    return res;
  }

  return 0;
}

int git_config_open_ondisk(git_config **out, const char *path)
{
  int error;
  git_config *config;

  *out = NULL;

  if (git_config_new(&config) < 0)
    return -1;

  if ((error = git_config_add_file_ondisk(config, path, GIT_CONFIG_LEVEL_LOCAL, NULL, 0)) < 0)
    git_config_free(config);
  else
    *out = config;

  return error;
}

int git_config_snapshot(git_config **out, git_config *in)
{
  int error = 0;
  size_t i;
  backend_internal *internal;
  git_config *config;

  *out = NULL;

  if (git_config_new(&config) < 0)
    return -1;

  git_vector_foreach(&in->backends, i, internal) {
    git_config_backend *b;

    if ((error = internal->backend->snapshot(&b, internal->backend)) < 0)
      break;

    if ((error = git_config_add_backend(config, b, internal->level, NULL, 0)) < 0) {
      b->free(b);
      break;
    }
  }

  if (error < 0)
    git_config_free(config);
  else
    *out = config;

  return error;
}

static int find_backend_by_level(
  backend_internal **out,
  const git_config *cfg,
  git_config_level_t level)
{
  int pos = -1;
  backend_internal *internal;
  size_t i;

  /* when passing GIT_CONFIG_HIGHEST_LEVEL, the idea is to get the config backend
   * which has the highest level. As config backends are stored in a vector
   * sorted by decreasing order of level, getting the backend at position 0
   * will do the job.
   */
  if (level == GIT_CONFIG_HIGHEST_LEVEL) {
    pos = 0;
  } else {
    git_vector_foreach(&cfg->backends, i, internal) {
      if (internal->level == level)
        pos = (int)i;
    }
  }

  if (pos == -1) {
    git_error_set(GIT_ERROR_CONFIG,
      "no configuration exists for the given level '%i'", (int)level);
    return GIT_ENOTFOUND;
  }

  *out = git_vector_get(&cfg->backends, pos);

  return 0;
}

static int duplicate_level(void **old_raw, void *new_raw)
{
  backend_internal **old = (backend_internal **)old_raw;

  GIT_UNUSED(new_raw);

  git_error_set(GIT_ERROR_CONFIG, "there already exists a configuration for the given level (%i)", (int)(*old)->level);
  return GIT_EEXISTS;
}

static void try_remove_existing_backend(
  git_config *cfg,
  git_config_level_t level)
{
  int pos = -1;
  backend_internal *internal;
  size_t i;

  git_vector_foreach(&cfg->backends, i, internal) {
    if (internal->level == level)
      pos = (int)i;
  }

  if (pos == -1)
    return;

  internal = git_vector_get(&cfg->backends, pos);

  if (git_vector_remove(&cfg->backends, pos) < 0)
    return;

  GIT_REFCOUNT_DEC(internal, backend_internal_free);
}

static int git_config__add_internal(
  git_config *cfg,
  backend_internal *internal,
  git_config_level_t level,
  int force)
{
  int result;

  /* delete existing config backend for level if it exists */
  if (force)
    try_remove_existing_backend(cfg, level);

  if ((result = git_vector_insert_sorted(&cfg->backends,
      internal, &duplicate_level)) < 0)
    return result;

  git_vector_sort(&cfg->backends);
  internal->backend->cfg = cfg;

  GIT_REFCOUNT_INC(internal);

  return 0;
}

int git_config_open_global(git_config **cfg_out, git_config *cfg)
{
  if (!git_config_open_level(cfg_out, cfg, GIT_CONFIG_LEVEL_XDG))
    return 0;

  return git_config_open_level(cfg_out, cfg, GIT_CONFIG_LEVEL_GLOBAL);
}

int git_config_open_level(
  git_config **cfg_out,
  const git_config *cfg_parent,
  git_config_level_t level)
{
  git_config *cfg;
  backend_internal *internal;
  int res;

  if ((res = find_backend_by_level(&internal, cfg_parent, level)) < 0)
    return res;

  if ((res = git_config_new(&cfg)) < 0)
    return res;

  if ((res = git_config__add_internal(cfg, internal, level, true)) < 0) {
    git_config_free(cfg);
    return res;
  }

  *cfg_out = cfg;

  return 0;
}

int git_config_add_backend(
  git_config *cfg,
  git_config_backend *backend,
  git_config_level_t level,
  const git_repository *repo,
  int force)
{
  backend_internal *internal;
  int result;

  GIT_ASSERT_ARG(cfg);
  GIT_ASSERT_ARG(backend);

  GIT_ERROR_CHECK_VERSION(backend, GIT_CONFIG_BACKEND_VERSION, "git_config_backend");

  if ((result = backend->open(backend, level, repo)) < 0)
    return result;

  internal = git__malloc(sizeof(backend_internal));
  GIT_ERROR_CHECK_ALLOC(internal);

  memset(internal, 0x0, sizeof(backend_internal));

  internal->backend = backend;
  internal->level = level;

  if ((result = git_config__add_internal(cfg, internal, level, force)) < 0) {
    git__free(internal);
    return result;
  }

  return 0;
}

/*
 * Loop over all the variables
 */

typedef struct {
  git_config_iterator parent;
  git_config_iterator *current;
  const git_config *cfg;
  git_regexp regex;
  size_t i;
} all_iter;

static int find_next_backend(size_t *out, const git_config *cfg, size_t i)
{
  backend_internal *internal;

  for (; i > 0; --i) {
    internal = git_vector_get(&cfg->backends, i - 1);
    if (!internal || !internal->backend)
      continue;

    *out = i;
    return 0;
  }

  return -1;
}

static int all_iter_next(git_config_entry **entry, git_config_iterator *_iter)
{
  all_iter *iter = (all_iter *) _iter;
  backend_internal *internal;
  git_config_backend *backend;
  size_t i;
  int error = 0;

  if (iter->current != NULL &&
      (error = iter->current->next(entry, iter->current)) == 0) {
    return 0;
  }

  if (error < 0 && error != GIT_ITEROVER)
    return error;

  do {
    if (find_next_backend(&i, iter->cfg, iter->i) < 0)
      return GIT_ITEROVER;

    internal = git_vector_get(&iter->cfg->backends, i - 1);
    backend = internal->backend;
    iter->i = i - 1;

    if (iter->current)
      iter->current->free(iter->current);

    iter->current = NULL;
    error = backend->iterator(&iter->current, backend);
    if (error == GIT_ENOTFOUND)
      continue;

    if (error < 0)
      return error;

    error = iter->current->next(entry, iter->current);
    /* If this backend is empty, then keep going */
    if (error == GIT_ITEROVER)
      continue;

    return error;

  } while(1);

  return GIT_ITEROVER;
}

static int all_iter_glob_next(git_config_entry **entry, git_config_iterator *_iter)
{
  int error;
  all_iter *iter = (all_iter *) _iter;

  /*
   * We use the "normal" function to grab the next one across
   * backends and then apply the regex
   */
  while ((error = all_iter_next(entry, _iter)) == 0) {
    /* skip non-matching keys if regexp was provided */
    if (git_regexp_match(&iter->regex, (*entry)->name) != 0)
      continue;

    /* and simply return if we like the entry's name */
    return 0;
  }

  return error;
}

static void all_iter_free(git_config_iterator *_iter)
{
  all_iter *iter = (all_iter *) _iter;

  if (iter->current)
    iter->current->free(iter->current);

  git__free(iter);
}

static void all_iter_glob_free(git_config_iterator *_iter)
{
  all_iter *iter = (all_iter *) _iter;

  git_regexp_dispose(&iter->regex);
  all_iter_free(_iter);
}

int git_config_iterator_new(git_config_iterator **out, const git_config *cfg)
{
  all_iter *iter;

  iter = git__calloc(1, sizeof(all_iter));
  GIT_ERROR_CHECK_ALLOC(iter);

  iter->parent.free = all_iter_free;
  iter->parent.next = all_iter_next;

  iter->i = cfg->backends.length;
  iter->cfg = cfg;

  *out = (git_config_iterator *) iter;

  return 0;
}

int git_config_iterator_glob_new(git_config_iterator **out, const git_config *cfg, const char *regexp)
{
  all_iter *iter;
  int result;

  if (regexp == NULL)
    return git_config_iterator_new(out, cfg);

  iter = git__calloc(1, sizeof(all_iter));
  GIT_ERROR_CHECK_ALLOC(iter);

  if ((result = git_regexp_compile(&iter->regex, regexp, 0)) < 0) {
    git__free(iter);
    return -1;
  }

  iter->parent.next = all_iter_glob_next;
  iter->parent.free = all_iter_glob_free;
  iter->i = cfg->backends.length;
  iter->cfg = cfg;

  *out = (git_config_iterator *) iter;

  return 0;
}

int git_config_foreach(
  const git_config *cfg, git_config_foreach_cb cb, void *payload)
{
  return git_config_foreach_match(cfg, NULL, cb, payload);
}

int git_config_backend_foreach_match(
  git_config_backend *backend,
  const char *regexp,
  git_config_foreach_cb cb,
  void *payload)
{
  git_config_entry *entry;
  git_config_iterator *iter;
  git_regexp regex;
  int error = 0;

  GIT_ASSERT_ARG(backend);
  GIT_ASSERT_ARG(cb);

  if (regexp && git_regexp_compile(&regex, regexp, 0) < 0)
    return -1;

  if ((error = backend->iterator(&iter, backend)) < 0) {
    iter = NULL;
    return -1;
  }

  while (!(iter->next(&entry, iter) < 0)) {
    /* skip non-matching keys if regexp was provided */
    if (regexp && git_regexp_match(&regex, entry->name) != 0)
      continue;

    /* abort iterator on non-zero return value */
    if ((error = cb(entry, payload)) != 0) {
      git_error_set_after_callback(error);
      break;
    }
  }

  if (regexp != NULL)
    git_regexp_dispose(&regex);

  iter->free(iter);

  return error;
}

int git_config_foreach_match(
  const git_config *cfg,
  const char *regexp,
  git_config_foreach_cb cb,
  void *payload)
{
  int error;
  git_config_iterator *iter;
  git_config_entry *entry;

  if ((error = git_config_iterator_glob_new(&iter, cfg, regexp)) < 0)
    return error;

  while (!(error = git_config_next(&entry, iter))) {
    if ((error = cb(entry, payload)) != 0) {
      git_error_set_after_callback(error);
      break;
    }
  }

  git_config_iterator_free(iter);

  if (error == GIT_ITEROVER)
    error = 0;

  return error;
}

/**************
 * Setters
 **************/

typedef enum {
  BACKEND_USE_SET,
  BACKEND_USE_DELETE
} backend_use;

static const char *uses[] = {
    "set",
    "delete"
};

static int get_backend_for_use(git_config_backend **out,
  git_config *cfg, const char *name, backend_use use)
{
  size_t i;
  backend_internal *backend;

  *out = NULL;

  if (git_vector_length(&cfg->backends) == 0) {
    git_error_set(GIT_ERROR_CONFIG,
      "cannot %s value for '%s' when no config backends exist",
      uses[use], name);
    return GIT_ENOTFOUND;
  }

  git_vector_foreach(&cfg->backends, i, backend) {
    if (!backend->backend->readonly) {
      *out = backend->backend;
      return 0;
    }
  }

  git_error_set(GIT_ERROR_CONFIG,
    "cannot %s value for '%s' when all config backends are readonly",
    uses[use], name);
  return GIT_ENOTFOUND;
}

int git_config_delete_entry(git_config *cfg, const char *name)
{
  git_config_backend *backend;

  if (get_backend_for_use(&backend, cfg, name, BACKEND_USE_DELETE) < 0)
    return GIT_ENOTFOUND;

  return backend->del(backend, name);
}

int git_config_set_int64(git_config *cfg, const char *name, int64_t value)
{
  char str_value[32]; /* All numbers should fit in here */
  p_snprintf(str_value, sizeof(str_value), "%" PRId64, value);
  return git_config_set_string(cfg, name, str_value);
}

int git_config_set_int32(git_config *cfg, const char *name, int32_t value)
{
  return git_config_set_int64(cfg, name, (int64_t)value);
}

int git_config_set_bool(git_config *cfg, const char *name, int value)
{
  return git_config_set_string(cfg, name, value ? "true" : "false");
}

int git_config_set_string(git_config *cfg, const char *name, const char *value)
{
  int error;
  git_config_backend *backend;

  if (!value) {
    git_error_set(GIT_ERROR_CONFIG, "the value to set cannot be NULL");
    return -1;
  }

  if (get_backend_for_use(&backend, cfg, name, BACKEND_USE_SET) < 0)
    return GIT_ENOTFOUND;

  error = backend->set(backend, name, value);

  if (!error && GIT_REFCOUNT_OWNER(cfg) != NULL)
    git_repository__configmap_lookup_cache_clear(GIT_REFCOUNT_OWNER(cfg));

  return error;
}

int git_config__update_entry(
  git_config *config,
  const char *key,
  const char *value,
  bool overwrite_existing,
  bool only_if_existing)
{
  int error = 0;
  git_config_entry *ce = NULL;

  if ((error = git_config__lookup_entry(&ce, config, key, false)) < 0)
    return error;

  if (!ce && only_if_existing) /* entry doesn't exist */
    return 0;
  if (ce && !overwrite_existing) /* entry would be overwritten */
    return 0;
  if (value && ce && ce->value && !strcmp(ce->value, value)) /* no change */
    return 0;
  if (!value && (!ce || !ce->value)) /* asked to delete absent entry */
    return 0;

  if (!value)
    error = git_config_delete_entry(config, key);
  else
    error = git_config_set_string(config, key, value);

  git_config_entry_free(ce);
  return error;
}

/***********
 * Getters
 ***********/

static int config_error_notfound(const char *name)
{
  git_error_set(GIT_ERROR_CONFIG, "config value '%s' was not found", name);
  return GIT_ENOTFOUND;
}

enum {
  GET_ALL_ERRORS = 0,
  GET_NO_MISSING = 1,
  GET_NO_ERRORS  = 2
};

static int get_entry(
  git_config_entry **out,
  const git_config *cfg,
  const char *name,
  bool normalize_name,
  int want_errors)
{
  int res = GIT_ENOTFOUND;
  const char *key = name;
  char *normalized = NULL;
  size_t i;
  backend_internal *internal;

  *out = NULL;

  if (normalize_name) {
    if ((res = git_config__normalize_name(name, &normalized)) < 0)
      goto cleanup;
    key = normalized;
  }

  res = GIT_ENOTFOUND;
  git_vector_foreach(&cfg->backends, i, internal) {
    if (!internal || !internal->backend)
      continue;

    res = internal->backend->get(internal->backend, key, out);
    if (res != GIT_ENOTFOUND)
      break;
  }

  git__free(normalized);

cleanup:
  if (res == GIT_ENOTFOUND)
    res = (want_errors > GET_ALL_ERRORS) ? 0 : config_error_notfound(name);
  else if (res && (want_errors == GET_NO_ERRORS)) {
    git_error_clear();
    res = 0;
  }

  return res;
}

int git_config_get_entry(
  git_config_entry **out, const git_config *cfg, const char *name)
{
  return get_entry(out, cfg, name, true, GET_ALL_ERRORS);
}

int git_config__lookup_entry(
  git_config_entry **out,
  const git_config *cfg,
  const char *key,
  bool no_errors)
{
  return get_entry(
    out, cfg, key, false, no_errors ? GET_NO_ERRORS : GET_NO_MISSING);
}

int git_config_get_mapped(
  int *out,
  const git_config *cfg,
  const char *name,
  const git_configmap *maps,
  size_t map_n)
{
  git_config_entry *entry;
  int ret;

  if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
    return ret;

  ret = git_config_lookup_map_value(out, maps, map_n, entry->value);
  git_config_entry_free(entry);

  return ret;
}

int git_config_get_int64(int64_t *out, const git_config *cfg, const char *name)
{
  git_config_entry *entry;
  int ret;

  if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
    return ret;

  ret = git_config_parse_int64(out, entry->value);
  git_config_entry_free(entry);

  return ret;
}

int git_config_get_int32(int32_t *out, const git_config *cfg, const char *name)
{
  git_config_entry *entry;
  int ret;

  if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
    return ret;

  ret = git_config_parse_int32(out, entry->value);
  git_config_entry_free(entry);

  return ret;
}

int git_config_get_bool(int *out, const git_config *cfg, const char *name)
{
  git_config_entry *entry;
  int ret;

  if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
    return ret;

  ret = git_config_parse_bool(out, entry->value);
  git_config_entry_free(entry);

  return ret;
}

static int is_readonly(const git_config *cfg)
{
  size_t i;
  backend_internal *internal;

  git_vector_foreach(&cfg->backends, i, internal) {
    if (!internal || !internal->backend)
      continue;

    if (!internal->backend->readonly)
      return 0;
  }

  return 1;
}

static int git_config__parse_path(git_str *out, const char *value)
{
  GIT_ASSERT_ARG(out);
  GIT_ASSERT_ARG(value);

  if (value[0] == '~') {
    if (value[1] != '\0' && value[1] != '/') {
      git_error_set(GIT_ERROR_CONFIG, "retrieving a homedir by name is not supported");
      return -1;
    }

    return git_sysdir_expand_homedir_file(out, value[1] ? &value[2] : NULL);
  }

  return git_str_sets(out, value);
}

int git_config_parse_path(git_buf *out, const char *value)
{
  GIT_BUF_WRAP_PRIVATE(out, git_config__parse_path, value);
}

int git_config_get_path(
  git_buf *out,
  const git_config *cfg,
  const char *name)
{
  GIT_BUF_WRAP_PRIVATE(out, git_config__get_path, cfg, name);
}

int git_config__get_path(
  git_str *out,
  const git_config *cfg,
  const char *name)
{
  git_config_entry *entry;
  int error;

  if ((error = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
    return error;

   error = git_config__parse_path(out, entry->value);
   git_config_entry_free(entry);

   return error;
}

int git_config_get_string(
  const char **out, const git_config *cfg, const char *name)
{
  git_config_entry *entry;
  int ret;

  if (!is_readonly(cfg)) {
    git_error_set(GIT_ERROR_CONFIG, "get_string called on a live config object");
    return -1;
  }

  ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS);
  *out = !ret ? (entry->value ? entry->value : "") : NULL;

  git_config_entry_free(entry);

  return ret;
}

int git_config_get_string_buf(
  git_buf *out, const git_config *cfg, const char *name)
{
  GIT_BUF_WRAP_PRIVATE(out, git_config__get_string_buf, cfg, name);
}

int git_config__get_string_buf(
  git_str *out, const git_config *cfg, const char *name)
{
  git_config_entry *entry;
  int ret;
  const char *str;

  GIT_ASSERT_ARG(out);
  GIT_ASSERT_ARG(cfg);

  ret  = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS);
  str = !ret ? (entry->value ? entry->value : "") : NULL;

  if (str)
    ret = git_str_puts(out, str);

  git_config_entry_free(entry);

  return ret;
}

char *git_config__get_string_force(
  const git_config *cfg, const char *key, const char *fallback_value)
{
  git_config_entry *entry;
  char *ret;

  get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
  ret = (entry && entry->value) ? git__strdup(entry->value) : fallback_value ? git__strdup(fallback_value) : NULL;
  git_config_entry_free(entry);

  return ret;
}

int git_config__get_bool_force(
  const git_config *cfg, const char *key, int fallback_value)
{
  int val = fallback_value;
  git_config_entry *entry;

  get_entry(&entry, cfg, key, false, GET_NO_ERRORS);

  if (entry && git_config_parse_bool(&val, entry->value) < 0)
    git_error_clear();

  git_config_entry_free(entry);
  return val;
}

int git_config__get_int_force(
  const git_config *cfg, const char *key, int fallback_value)
{
  int32_t val = (int32_t)fallback_value;
  git_config_entry *entry;

  get_entry(&entry, cfg, key, false, GET_NO_ERRORS);

  if (entry && git_config_parse_int32(&val, entry->value) < 0)
    git_error_clear();

  git_config_entry_free(entry);
  return (int)val;
}

int git_config_get_multivar_foreach(
  const git_config *cfg, const char *name, const char *regexp,
  git_config_foreach_cb cb, void *payload)
{
  int err, found;
  git_config_iterator *iter;
  git_config_entry *entry;

  if ((err = git_config_multivar_iterator_new(&iter, cfg, name, regexp)) < 0)
    return err;

  found = 0;
  while ((err = iter->next(&entry, iter)) == 0) {
    found = 1;

    if ((err = cb(entry, payload)) != 0) {
      git_error_set_after_callback(err);
      break;
    }
  }

  iter->free(iter);
  if (err == GIT_ITEROVER)
    err = 0;

  if (found == 0 && err == 0)
    err = config_error_notfound(name);

  return err;
}

typedef struct {
  git_config_iterator parent;
  git_config_iterator *iter;
  char *name;
  git_regexp regex;
  int have_regex;
} multivar_iter;

static int multivar_iter_next(git_config_entry **entry, git_config_iterator *_iter)
{
  multivar_iter *iter = (multivar_iter *) _iter;
  int error = 0;

  while ((error = iter->iter->next(entry, iter->iter)) == 0) {
    if (git__strcmp(iter->name, (*entry)->name))
      continue;

    if (!iter->have_regex)
      return 0;

    if (git_regexp_match(&iter->regex, (*entry)->value) == 0)
      return 0;
  }

  return error;
}

static void multivar_iter_free(git_config_iterator *_iter)
{
  multivar_iter *iter = (multivar_iter *) _iter;

  iter->iter->free(iter->iter);

  git__free(iter->name);
  if (iter->have_regex)
    git_regexp_dispose(&iter->regex);
  git__free(iter);
}

int git_config_multivar_iterator_new(git_config_iterator **out, const git_config *cfg, const char *name, const char *regexp)
{
  multivar_iter *iter = NULL;
  git_config_iterator *inner = NULL;
  int error;

  if ((error = git_config_iterator_new(&inner, cfg)) < 0)
    return error;

  iter = git__calloc(1, sizeof(multivar_iter));
  GIT_ERROR_CHECK_ALLOC(iter);

  if ((error = git_config__normalize_name(name, &iter->name)) < 0)
    goto on_error;

  if (regexp != NULL) {
    if ((error = git_regexp_compile(&iter->regex, regexp, 0)) < 0)
      goto on_error;

    iter->have_regex = 1;
  }

  iter->iter = inner;
  iter->parent.free = multivar_iter_free;
  iter->parent.next = multivar_iter_next;

  *out = (git_config_iterator *) iter;

  return 0;

on_error:

  inner->free(inner);
  git__free(iter);
  return error;
}

int git_config_set_multivar(git_config *cfg, const char *name, const char *regexp, const char *value)
{
  git_config_backend *backend;

  if (get_backend_for_use(&backend, cfg, name, BACKEND_USE_DELETE) < 0)
    return GIT_ENOTFOUND;

  return backend->set_multivar(backend, name, regexp, value);
}

int git_config_delete_multivar(git_config *cfg, const char *name, const char *regexp)
{
  git_config_backend *backend;

  if (get_backend_for_use(&backend, cfg, name, BACKEND_USE_DELETE) < 0)
    return GIT_ENOTFOUND;

  return backend->del_multivar(backend, name, regexp);
}

int git_config_next(git_config_entry **entry, git_config_iterator *iter)
{
  return iter->next(entry, iter);
}

void git_config_iterator_free(git_config_iterator *iter)
{
  if (iter == NULL)
    return;

  iter->free(iter);
}

int git_config_find_global(git_buf *path)
{
  GIT_BUF_WRAP_PRIVATE(path, git_sysdir_find_global_file, GIT_CONFIG_FILENAME_GLOBAL);
}

int git_config__find_global(git_str *path)
{
  return git_sysdir_find_global_file(path, GIT_CONFIG_FILENAME_GLOBAL);
}

int git_config_find_xdg(git_buf *path)
{
  GIT_BUF_WRAP_PRIVATE(path, git_sysdir_find_xdg_file, GIT_CONFIG_FILENAME_XDG);
}

int git_config__find_xdg(git_str *path)
{
  return git_sysdir_find_xdg_file(path, GIT_CONFIG_FILENAME_XDG);
}

int git_config_find_system(git_buf *path)
{
  GIT_BUF_WRAP_PRIVATE(path, git_sysdir_find_system_file, GIT_CONFIG_FILENAME_SYSTEM);
}

int git_config__find_system(git_str *path)
{
  return git_sysdir_find_system_file(path, GIT_CONFIG_FILENAME_SYSTEM);
}

int git_config_find_programdata(git_buf *path)
{
  git_str str = GIT_STR_INIT;
  int error;

  if ((error = git_buf_tostr(&str, path)) == 0 &&
      (error = git_config__find_programdata(&str)) == 0)
    error = git_buf_fromstr(path, &str);

  git_str_dispose(&str);
  return error;
}

int git_config__find_programdata(git_str *path)
{
  git_fs_path_owner_t owner_level =
    GIT_FS_PATH_OWNER_CURRENT_USER |
    GIT_FS_PATH_OWNER_ADMINISTRATOR;
  bool is_safe;
  int error;

  if ((error = git_sysdir_find_programdata_file(path, GIT_CONFIG_FILENAME_PROGRAMDATA)) < 0)
    return error;

  if (git_fs_path_owner_is(&is_safe, path->ptr, owner_level) < 0)
    return -1;

  if (!is_safe) {
    git_error_set(GIT_ERROR_CONFIG, "programdata path has invalid ownership");
    return -1;
  }

  return 0;
}

int git_config__global_location(git_str *buf)
{
  const git_str *paths;
  const char *sep, *start;

  if (git_sysdir_get(&paths, GIT_SYSDIR_GLOBAL) < 0)
    return -1;

  /* no paths, so give up */
  if (!paths || !git_str_len(paths))
    return -1;

  /* find unescaped separator or end of string */
  for (sep = start = git_str_cstr(paths); *sep; ++sep) {
    if (*sep == GIT_PATH_LIST_SEPARATOR &&
      (sep <= start || sep[-1] != '\\'))
      break;
  }

  if (git_str_set(buf, start, (size_t)(sep - start)) < 0)
    return -1;

  return git_str_joinpath(buf, buf->ptr, GIT_CONFIG_FILENAME_GLOBAL);
}

int git_config_open_default(git_config **out)
{
  int error;
  git_config *cfg = NULL;
  git_str buf = GIT_STR_INIT;

  if ((error = git_config_new(&cfg)) < 0)
    return error;

  if (!git_config__find_global(&buf) ||
      !git_config__global_location(&buf)) {
    error = git_config_add_file_ondisk(cfg, buf.ptr,
      GIT_CONFIG_LEVEL_GLOBAL, NULL, 0);
  }

  if (!error && !git_config__find_xdg(&buf))
    error = git_config_add_file_ondisk(cfg, buf.ptr,
      GIT_CONFIG_LEVEL_XDG, NULL, 0);

  if (!error && !git_config__find_system(&buf))
    error = git_config_add_file_ondisk(cfg, buf.ptr,
      GIT_CONFIG_LEVEL_SYSTEM, NULL, 0);

  if (!error && !git_config__find_programdata(&buf))
    error = git_config_add_file_ondisk(cfg, buf.ptr,
      GIT_CONFIG_LEVEL_PROGRAMDATA, NULL, 0);

  git_str_dispose(&buf);

  if (error) {
    git_config_free(cfg);
    cfg = NULL;
  }

  *out = cfg;

  return error;
}

int git_config_lock(git_transaction **out, git_config *cfg)
{
  int error;
  git_config_backend *backend;
  backend_internal *internal;

  GIT_ASSERT_ARG(cfg);

  internal = git_vector_get(&cfg->backends, 0);
  if (!internal || !internal->backend) {
    git_error_set(GIT_ERROR_CONFIG, "cannot lock; the config has no backends");
    return -1;
  }
  backend = internal->backend;

  if ((error = backend->lock(backend)) < 0)
    return error;

  return git_transaction_config_new(out, cfg);
}

int git_config_unlock(git_config *cfg, int commit)
{
  git_config_backend *backend;
  backend_internal *internal;

  GIT_ASSERT_ARG(cfg);

  internal = git_vector_get(&cfg->backends, 0);
  if (!internal || !internal->backend) {
    git_error_set(GIT_ERROR_CONFIG, "cannot lock; the config has no backends");
    return -1;
  }

  backend = internal->backend;

  return backend->unlock(backend, commit);
}

/***********
 * Parsers
 ***********/

int git_config_lookup_map_value(
  int *out,
  const git_configmap *maps,
  size_t map_n,
  const char *value)
{
  size_t i;

  for (i = 0; i < map_n; ++i) {
    const git_configmap *m = maps + i;

    switch (m->type) {
    case GIT_CONFIGMAP_FALSE:
    case GIT_CONFIGMAP_TRUE: {
      int bool_val;

      if (git_config_parse_bool(&bool_val, value) == 0 &&
        bool_val == (int)m->type) {
        *out = m->map_value;
        return 0;
      }
      break;
    }

    case GIT_CONFIGMAP_INT32:
      if (git_config_parse_int32(out, value) == 0)
        return 0;
      break;

    case GIT_CONFIGMAP_STRING:
      if (value && strcasecmp(value, m->str_match) == 0) {
        *out = m->map_value;
        return 0;
      }
      break;
    }
  }

  git_error_set(GIT_ERROR_CONFIG, "failed to map '%s'", value);
  return -1;
}

int git_config_lookup_map_enum(git_configmap_t *type_out, const char **str_out,
             const git_configmap *maps, size_t map_n, int enum_val)
{
  size_t i;

  for (i = 0; i < map_n; i++) {
    const git_configmap *m = &maps[i];

    if (m->map_value != enum_val)
      continue;

    *type_out = m->type;
    *str_out = m->str_match;
    return 0;
  }

  git_error_set(GIT_ERROR_CONFIG, "invalid enum value");
  return GIT_ENOTFOUND;
}

int git_config_parse_bool(int *out, const char *value)
{
  if (git__parse_bool(out, value) == 0)
    return 0;

  if (git_config_parse_int32(out, value) == 0) {
    *out = !!(*out);
    return 0;
  }

  git_error_set(GIT_ERROR_CONFIG, "failed to parse '%s' as a boolean value", value);
  return -1;
}

int git_config_parse_int64(int64_t *out, const char *value)
{
  const char *num_end;
  int64_t num;

  if (!value || git__strntol64(&num, value, strlen(value), &num_end, 0) < 0)
    goto fail_parse;

  switch (*num_end) {
  case 'g':
  case 'G':
    num *= 1024;
    /* fallthrough */

  case 'm':
  case 'M':
    num *= 1024;
    /* fallthrough */

  case 'k':
  case 'K':
    num *= 1024;

    /* check that that there are no more characters after the
     * given modifier suffix */
    if (num_end[1] != '\0')
      return -1;

    /* fallthrough */

  case '\0':
    *out = num;
    return 0;

  default:
    goto fail_parse;
  }

fail_parse:
  git_error_set(GIT_ERROR_CONFIG, "failed to parse '%s' as an integer", value ? value : "(null)");
  return -1;
}

int git_config_parse_int32(int32_t *out, const char *value)
{
  int64_t tmp;
  int32_t truncate;

  if (git_config_parse_int64(&tmp, value) < 0)
    goto fail_parse;

  truncate = tmp & 0xFFFFFFFF;
  if (truncate != tmp)
    goto fail_parse;

  *out = truncate;
  return 0;

fail_parse:
  git_error_set(GIT_ERROR_CONFIG, "failed to parse '%s' as a 32-bit integer", value ? value : "(null)");
  return -1;
}

static int normalize_section(char *start, char *end)
{
  char *scan;

  if (start == end)
    return GIT_EINVALIDSPEC;

  /* Validate and downcase range */
  for (scan = start; *scan; ++scan) {
    if (end && scan >= end)
      break;
    if (isalnum(*scan))
      *scan = (char)git__tolower(*scan);
    else if (*scan != '-' || scan == start)
      return GIT_EINVALIDSPEC;
  }

  if (scan == start)
    return GIT_EINVALIDSPEC;

  return 0;
}


/* Take something the user gave us and make it nice for our hash function */
int git_config__normalize_name(const char *in, char **out)
{
  char *name, *fdot, *ldot;

  GIT_ASSERT_ARG(in);
  GIT_ASSERT_ARG(out);

  name = git__strdup(in);
  GIT_ERROR_CHECK_ALLOC(name);

  fdot = strchr(name, '.');
  ldot = strrchr(name, '.');

  if (fdot == NULL || fdot == name || ldot == NULL || !ldot[1])
    goto invalid;

  /* Validate and downcase up to first dot and after last dot */
  if (normalize_section(name, fdot) < 0 ||
      normalize_section(ldot + 1, NULL) < 0)
    goto invalid;

  /* If there is a middle range, make sure it doesn't have newlines */
  while (fdot < ldot)
    if (*fdot++ == '\n')
      goto invalid;

  *out = name;
  return 0;

invalid:
  git__free(name);
  git_error_set(GIT_ERROR_CONFIG, "invalid config item name '%s'", in);
  return GIT_EINVALIDSPEC;
}

struct rename_data {
  git_config *config;
  git_str *name;
  size_t old_len;
};

static int rename_config_entries_cb(
  const git_config_entry *entry,
  void *payload)
{
  int error = 0;
  struct rename_data *data = (struct rename_data *)payload;
  size_t base_len = git_str_len(data->name);

  if (base_len > 0 &&
    !(error = git_str_puts(data->name, entry->name + data->old_len)))
  {
    error = git_config_set_string(
      data->config, git_str_cstr(data->name), entry->value);

    git_str_truncate(data->name, base_len);
  }

  if (!error)
    error = git_config_delete_entry(data->config, entry->name);

  return error;
}

int git_config_rename_section(
  git_repository *repo,
  const char *old_section_name,
  const char *new_section_name)
{
  git_config *config;
  git_str pattern = GIT_STR_INIT, replace = GIT_STR_INIT;
  int error = 0;
  struct rename_data data;

  git_str_puts_escape_regex(&pattern, old_section_name);

  if ((error = git_str_puts(&pattern, "\\..+")) < 0)
    goto cleanup;

  if ((error = git_repository_config__weakptr(&config, repo)) < 0)
    goto cleanup;

  data.config  = config;
  data.name    = &replace;
  data.old_len = strlen(old_section_name) + 1;

  if ((error = git_str_join(&replace, '.', new_section_name, "")) < 0)
    goto cleanup;

  if (new_section_name != NULL &&
      (error = normalize_section(replace.ptr, strchr(replace.ptr, '.'))) < 0)
  {
    git_error_set(
      GIT_ERROR_CONFIG, "invalid config section '%s'", new_section_name);
    goto cleanup;
  }

  error = git_config_foreach_match(
    config, git_str_cstr(&pattern), rename_config_entries_cb, &data);

cleanup:
  git_str_dispose(&pattern);
  git_str_dispose(&replace);

  return error;
}

int git_config_init_backend(git_config_backend *backend, unsigned int version)
{
  GIT_INIT_STRUCTURE_FROM_TEMPLATE(
    backend, version, git_config_backend, GIT_CONFIG_BACKEND_INIT);
  return 0;
}

Coverage Report

Created: 2023-11-19 06:28