/*

 * We put all the git config variables in this same object

 * file, so that programs can link against the config parser

 * without having to link against all the rest of git.

 *

 * In particular, no need to bring in libz etc unless needed,

 * even if you might want to know where the git directory etc

 * are.

 */

#include "git-compat-util.h"

#include "abspath.h"

#include "branch.h"

#include "convert.h"

#include "environment.h"

#include "gettext.h"

#include "repository.h"

#include "config.h"

#include "refs.h"

#include "fmt-merge-msg.h"

#include "commit.h"

#include "strvec.h"

#include "object-file.h"

#include "object-store-ll.h"

#include "path.h"

#include "replace-object.h"

#include "tmp-objdir.h"

#include "chdir-notify.h"

#include "setup.h"

#include "shallow.h"

#include "trace.h"

#include "write-or-die.h"

int trust_executable_bit = 1;

int trust_ctime = 1;

int check_stat = 1;

int has_symlinks = 1;

int minimum_abbrev = 4, default_abbrev = -1;

int ignore_case;

int assume_unchanged;

int prefer_symlink_refs;

int is_bare_repository_cfg = -1; /* unspecified */

int warn_ambiguous_refs = 1;

int warn_on_object_refname_ambiguity = 1;

int repository_format_precious_objects;

const char *git_commit_encoding;

const char *git_log_output_encoding;

char *apply_default_whitespace;

char *apply_default_ignorewhitespace;

const char *git_attributes_file;

const char *git_hooks_path;

int zlib_compression_level = Z_BEST_SPEED;

int pack_compression_level = Z_DEFAULT_COMPRESSION;

int fsync_object_files = -1;

int use_fsync = -1;

enum fsync_method fsync_method = FSYNC_METHOD_DEFAULT;

enum fsync_component fsync_components = FSYNC_COMPONENTS_DEFAULT;

size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;

size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;

size_t delta_base_cache_limit = 96 * 1024 * 1024;

unsigned long big_file_threshold = 512 * 1024 * 1024;

const char *editor_program;

const char *askpass_program;

const char *excludes_file;

enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;

enum eol core_eol = EOL_UNSET;

int global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;

char *check_roundtrip_encoding = "SHIFT-JIS";

enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;

enum rebase_setup_type autorebase = AUTOREBASE_NEVER;

enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;

#ifndef OBJECT_CREATION_MODE

#define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS

#endif

enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;

char *notes_ref_name;

int grafts_keep_true_parents;

int core_apply_sparse_checkout;

int core_sparse_checkout_cone;

int sparse_expect_files_outside_of_patterns;

int merge_log_config = -1;

int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */

unsigned long pack_size_limit_cfg;

enum log_refs_config log_all_ref_updates = LOG_REFS_UNSET;

int max_allowed_tree_depth =

#ifdef _MSC_VER

  /*

   * When traversing into too-deep trees, Visual C-compiled Git seems to

   * run into some internal stack overflow detection in the

   * `RtlpAllocateHeap()` function that is called from within

   * `git_inflate_init()`'s call tree. The following value seems to be

   * low enough to avoid that by letting Git exit with an error before

   * the stack overflow can occur.

   */

  512;

#else

  2048;

#endif

#ifndef PROTECT_HFS_DEFAULT

#define PROTECT_HFS_DEFAULT 0

#endif

int protect_hfs = PROTECT_HFS_DEFAULT;

#ifndef PROTECT_NTFS_DEFAULT

#define PROTECT_NTFS_DEFAULT 1

#endif

int protect_ntfs = PROTECT_NTFS_DEFAULT;

/*

 * The character that begins a commented line in user-editable file

 * that is subject to stripspace.

 */

char comment_line_char = '#';

int auto_comment_line_char;

/* Parallel index stat data preload? */

int core_preload_index = 1;

/* This is set by setup_git_dir_gently() and/or git_default_config() */

char *git_work_tree_cfg;

static char *git_namespace;

/*

 * Repository-local GIT_* environment variables; see environment.h for details.

 */

const char * const local_repo_env[] = {

  ALTERNATE_DB_ENVIRONMENT,

  CONFIG_ENVIRONMENT,

  CONFIG_DATA_ENVIRONMENT,

  CONFIG_COUNT_ENVIRONMENT,

  DB_ENVIRONMENT,

  GIT_DIR_ENVIRONMENT,

  GIT_WORK_TREE_ENVIRONMENT,

  GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,

  GRAFT_ENVIRONMENT,

  INDEX_ENVIRONMENT,

  NO_REPLACE_OBJECTS_ENVIRONMENT,

  GIT_REPLACE_REF_BASE_ENVIRONMENT,

  GIT_PREFIX_ENVIRONMENT,

  GIT_SHALLOW_FILE_ENVIRONMENT,

  GIT_COMMON_DIR_ENVIRONMENT,

  NULL

};

static char *expand_namespace(const char *raw_namespace)

{

  struct strbuf buf = STRBUF_INIT;

  struct strbuf **components, **c;

  if (!raw_namespace || !*raw_namespace)

    return xstrdup("");

  strbuf_addstr(&buf, raw_namespace);

  components = strbuf_split(&buf, '/');

  strbuf_reset(&buf);

  for (c = components; *c; c++)

    if (strcmp((*c)->buf, "/") != 0)

      strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);

  strbuf_list_free(components);

  if (check_refname_format(buf.buf, 0))

    die(_("bad git namespace path \"%s\""), raw_namespace);

  strbuf_addch(&buf, '/');

  return strbuf_detach(&buf, NULL);

}

const char *getenv_safe(struct strvec *argv, const char *name)

{

  const char *value = getenv(name);

  if (!value)

    return NULL;

  strvec_push(argv, value);

  return argv->v[argv->nr - 1];

}

void setup_git_env(const char *git_dir)

{

  char *git_replace_ref_base;

  const char *shallow_file;

  const char *replace_ref_base;

  struct set_gitdir_args args = { NULL };

  struct strvec to_free = STRVEC_INIT;

  args.commondir = getenv_safe(&to_free, GIT_COMMON_DIR_ENVIRONMENT);

  args.object_dir = getenv_safe(&to_free, DB_ENVIRONMENT);

  args.graft_file = getenv_safe(&to_free, GRAFT_ENVIRONMENT);

  args.index_file = getenv_safe(&to_free, INDEX_ENVIRONMENT);

  args.alternate_db = getenv_safe(&to_free, ALTERNATE_DB_ENVIRONMENT);

  if (getenv(GIT_QUARANTINE_ENVIRONMENT)) {

    args.disable_ref_updates = 1;

  }

  repo_set_gitdir(the_repository, git_dir, &args);

  strvec_clear(&to_free);

  if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))

    disable_replace_refs();

  replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);

  git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base

                : "refs/replace/");

  update_ref_namespace(NAMESPACE_REPLACE, git_replace_ref_base);

  free(git_namespace);

  git_namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));

  shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);

  if (shallow_file)

    set_alternate_shallow_file(the_repository, shallow_file, 0);

}

int is_bare_repository(void)

{

  /* if core.bare is not 'false', let's see if there is a work tree */

  return is_bare_repository_cfg && !get_git_work_tree();

}

int have_git_dir(void)

{

  return startup_info->have_repository

    || the_repository->gitdir;

}

const char *get_git_dir(void)

{

  if (!the_repository->gitdir)

    BUG("git environment hasn't been setup");

  return the_repository->gitdir;

}

const char *get_git_common_dir(void)

{

  if (!the_repository->commondir)

    BUG("git environment hasn't been setup");

  return the_repository->commondir;

}

const char *get_git_namespace(void)

{

  if (!git_namespace)

    BUG("git environment hasn't been setup");

  return git_namespace;

}

const char *strip_namespace(const char *namespaced_ref)

{

  const char *out;

  if (skip_prefix(namespaced_ref, get_git_namespace(), &out))

    return out;

  return NULL;

}

static int git_work_tree_initialized;

/*

 * Note.  This works only before you used a work tree.  This was added

 * primarily to support git-clone to work in a new repository it just

 * created, and is not meant to flip between different work trees.

 */

void set_git_work_tree(const char *new_work_tree)

{

  if (git_work_tree_initialized) {

    struct strbuf realpath = STRBUF_INIT;

    strbuf_realpath(&realpath, new_work_tree, 1);

    new_work_tree = realpath.buf;

    if (strcmp(new_work_tree, the_repository->worktree))

      die("internal error: work tree has already been set\n"

          "Current worktree: %s\nNew worktree: %s",

          the_repository->worktree, new_work_tree);

    strbuf_release(&realpath);

    return;

  }

  git_work_tree_initialized = 0;

  repo_set_worktree(the_repository, new_work_tree);

}

const char *get_git_work_tree(void)

{

  return the_repository->worktree;

}

const char *get_object_directory(void)

{

  if (!the_repository->objects->odb)

    BUG("git environment hasn't been setup");

  return the_repository->objects->odb->path;

}

int odb_mkstemp(struct strbuf *temp_filename, const char *pattern)

{

  int fd;

  /*

   * we let the umask do its job, don't try to be more

   * restrictive except to remove write permission.

   */

  int mode = 0444;

  git_path_buf(temp_filename, "objects/%s", pattern);

  fd = git_mkstemp_mode(temp_filename->buf, mode);

  if (0 <= fd)

    return fd;

  /* slow path */

  /* some mkstemp implementations erase temp_filename on failure */

  git_path_buf(temp_filename, "objects/%s", pattern);

  safe_create_leading_directories(temp_filename->buf);

  return xmkstemp_mode(temp_filename->buf, mode);

}

int odb_pack_keep(const char *name)

{

  int fd;

  fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);

  if (0 <= fd)

    return fd;

  /* slow path */

  safe_create_leading_directories_const(name);

  return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);

}

char *get_index_file(void)

{

  if (!the_repository->index_file)

    BUG("git environment hasn't been setup");

  return the_repository->index_file;

}

char *get_graft_file(struct repository *r)

{

  if (!r->graft_file)

    BUG("git environment hasn't been setup");

  return r->graft_file;

}

static void set_git_dir_1(const char *path)

{

  xsetenv(GIT_DIR_ENVIRONMENT, path, 1);

  setup_git_env(path);

}

static void update_relative_gitdir(const char *name UNUSED,

           const char *old_cwd,

           const char *new_cwd,

           void *data UNUSED)

{

  char *path = reparent_relative_path(old_cwd, new_cwd, get_git_dir());

  struct tmp_objdir *tmp_objdir = tmp_objdir_unapply_primary_odb();

  trace_printf_key(&trace_setup_key,

       "setup: move $GIT_DIR to '%s'",

       path);

  set_git_dir_1(path);

  if (tmp_objdir)

    tmp_objdir_reapply_primary_odb(tmp_objdir, old_cwd, new_cwd);

  free(path);

}

void set_git_dir(const char *path, int make_realpath)

{

  struct strbuf realpath = STRBUF_INIT;

  if (make_realpath) {

    strbuf_realpath(&realpath, path, 1);

    path = realpath.buf;

  }

  set_git_dir_1(path);

  if (!is_absolute_path(path))

    chdir_notify_register(NULL, update_relative_gitdir, NULL);

  strbuf_release(&realpath);

}

const char *get_log_output_encoding(void)

{

  return git_log_output_encoding ? git_log_output_encoding

    : get_commit_output_encoding();

}

const char *get_commit_output_encoding(void)

{

  return git_commit_encoding ? git_commit_encoding : "UTF-8";

}

static int the_shared_repository = PERM_UMASK;

static int need_shared_repository_from_config = 1;

void set_shared_repository(int value)

{

  the_shared_repository = value;

  need_shared_repository_from_config = 0;

}

int get_shared_repository(void)

{

  if (need_shared_repository_from_config) {

    const char *var = "core.sharedrepository";

    const char *value;

    if (!git_config_get_value(var, &value))

      the_shared_repository = git_config_perm(var, value);

    need_shared_repository_from_config = 0;

  }

  return the_shared_repository;

}

void reset_shared_repository(void)

{

  need_shared_repository_from_config = 1;

}

int use_optional_locks(void)

{

  return git_env_bool(GIT_OPTIONAL_LOCKS_ENVIRONMENT, 1);

}

int print_sha1_ellipsis(void)

{

  /*

   * Determine if the calling environment contains the variable

   * GIT_PRINT_SHA1_ELLIPSIS set to "yes".

   */

  static int cached_result = -1; /* unknown */

  if (cached_result < 0) {

    const char *v = getenv("GIT_PRINT_SHA1_ELLIPSIS");

    cached_result = (v && !strcasecmp(v, "yes"));

  }

  return cached_result;

}