#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"

#include "abspath.h"

#include "environment.h"

#include "gettext.h"

#include "path.h"

#include "repository.h"

#include "refs.h"

#include "setup.h"

#include "strbuf.h"

#include "worktree.h"

#include "dir.h"

#include "wt-status.h"

#include "config.h"

void free_worktree(struct worktree *worktree)

{

  if (!worktree)

    return;

  free(worktree->path);

  free(worktree->id);

  free(worktree->head_ref);

  free(worktree->lock_reason);

  free(worktree->prune_reason);

  free(worktree);

}

void free_worktrees(struct worktree **worktrees)

{

  int i = 0;

  for (i = 0; worktrees[i]; i++)

    free_worktree(worktrees[i]);

  free (worktrees);

}

/**

 * Update head_oid, head_ref and is_detached of the given worktree

 */

static void add_head_info(struct worktree *wt)

{

  int flags;

  const char *target;

  target = refs_resolve_ref_unsafe(get_worktree_ref_store(wt),

           "HEAD",

           0,

           &wt->head_oid, &flags);

  if (!target)

    return;

  if (flags & REF_ISSYMREF)

    wt->head_ref = xstrdup(target);

  else

    wt->is_detached = 1;

}

static int is_current_worktree(struct worktree *wt)

{

  char *git_dir = absolute_pathdup(get_git_dir());

  const char *wt_git_dir = get_worktree_git_dir(wt);

  int is_current = !fspathcmp(git_dir, absolute_path(wt_git_dir));

  free(git_dir);

  return is_current;

}

/**

 * get the main worktree

 */

static struct worktree *get_main_worktree(int skip_reading_head)

{

  struct worktree *worktree = NULL;

  struct strbuf worktree_path = STRBUF_INIT;

  strbuf_add_real_path(&worktree_path, get_git_common_dir());

  strbuf_strip_suffix(&worktree_path, "/.git");

  CALLOC_ARRAY(worktree, 1);

  worktree->repo = the_repository;

  worktree->path = strbuf_detach(&worktree_path, NULL);

  /*

   * NEEDSWORK: If this function is called from a secondary worktree and

   * config.worktree is present, is_bare_repository_cfg will reflect the

   * contents of config.worktree, not the contents of the main worktree.

   * This means that worktree->is_bare may be set to 0 even if the main

   * worktree is configured to be bare.

   */

  worktree->is_bare = (is_bare_repository_cfg == 1) ||

    is_bare_repository();

  worktree->is_current = is_current_worktree(worktree);

  if (!skip_reading_head)

    add_head_info(worktree);

  return worktree;

}

struct worktree *get_linked_worktree(const char *id,

             int skip_reading_head)

{

  struct worktree *worktree = NULL;

  struct strbuf path = STRBUF_INIT;

  struct strbuf worktree_path = STRBUF_INIT;

  if (!id)

    die("Missing linked worktree name");

  strbuf_git_common_path(&path, the_repository, "worktrees/%s/gitdir", id);

  if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)

    /* invalid gitdir file */

    goto done;

  strbuf_rtrim(&worktree_path);

  strbuf_strip_suffix(&worktree_path, "/.git");

  CALLOC_ARRAY(worktree, 1);

  worktree->repo = the_repository;

  worktree->path = strbuf_detach(&worktree_path, NULL);

  worktree->id = xstrdup(id);

  worktree->is_current = is_current_worktree(worktree);

  if (!skip_reading_head)

    add_head_info(worktree);

done:

  strbuf_release(&path);

  strbuf_release(&worktree_path);

  return worktree;

}

/*

 * NEEDSWORK: This function exists so that we can look up metadata of a

 * worktree without trying to access any of its internals like the refdb. It

 * would be preferable to instead have a corruption-tolerant function for

 * retrieving worktree metadata that could be used when the worktree is known

 * to not be in a healthy state, e.g. when creating or repairing it.

 */

static struct worktree **get_worktrees_internal(int skip_reading_head)

{

  struct worktree **list = NULL;

  struct strbuf path = STRBUF_INIT;

  DIR *dir;

  struct dirent *d;

  int counter = 0, alloc = 2;

  ALLOC_ARRAY(list, alloc);

  list[counter++] = get_main_worktree(skip_reading_head);

  strbuf_addf(&path, "%s/worktrees", get_git_common_dir());

  dir = opendir(path.buf);

  strbuf_release(&path);

  if (dir) {

    while ((d = readdir_skip_dot_and_dotdot(dir)) != NULL) {

      struct worktree *linked = NULL;

      if ((linked = get_linked_worktree(d->d_name, skip_reading_head))) {

        ALLOC_GROW(list, counter + 1, alloc);

        list[counter++] = linked;

      }

    }

    closedir(dir);

  }

  ALLOC_GROW(list, counter + 1, alloc);

  list[counter] = NULL;

  return list;

}

struct worktree **get_worktrees(void)

{

  return get_worktrees_internal(0);

}

const char *get_worktree_git_dir(const struct worktree *wt)

{

  if (!wt)

    return get_git_dir();

  else if (!wt->id)

    return get_git_common_dir();

  else

    return git_common_path("worktrees/%s", wt->id);

}

static struct worktree *find_worktree_by_suffix(struct worktree **list,

            const char *suffix)

{

  struct worktree *found = NULL;

  int nr_found = 0, suffixlen;

  suffixlen = strlen(suffix);

  if (!suffixlen)

    return NULL;

  for (; *list && nr_found < 2; list++) {

    const char  *path  = (*list)->path;

    int    pathlen = strlen(path);

    int    start   = pathlen - suffixlen;

    /* suffix must start at directory boundary */

    if ((!start || (start > 0 && is_dir_sep(path[start - 1]))) &&

        !fspathcmp(suffix, path + start)) {

      found = *list;

      nr_found++;

    }

  }

  return nr_found == 1 ? found : NULL;

}

struct worktree *find_worktree(struct worktree **list,

             const char *prefix,

             const char *arg)

{

  struct worktree *wt;

  char *to_free = NULL;

  if ((wt = find_worktree_by_suffix(list, arg)))

    return wt;

  if (prefix)

    arg = to_free = prefix_filename(prefix, arg);

  wt = find_worktree_by_path(list, arg);

  free(to_free);

  return wt;

}

struct worktree *find_worktree_by_path(struct worktree **list, const char *p)

{

  struct strbuf wt_path = STRBUF_INIT;

  char *path = real_pathdup(p, 0);

  if (!path)

    return NULL;

  for (; *list; list++) {

    if (!strbuf_realpath(&wt_path, (*list)->path, 0))

      continue;

    if (!fspathcmp(path, wt_path.buf))

      break;

  }

  free(path);

  strbuf_release(&wt_path);

  return *list;

}

int is_main_worktree(const struct worktree *wt)

{

  return !wt->id;

}

const char *worktree_lock_reason(struct worktree *wt)

{

  if (is_main_worktree(wt))

    return NULL;

  if (!wt->lock_reason_valid) {

    struct strbuf path = STRBUF_INIT;

    strbuf_addstr(&path, worktree_git_path(the_repository, wt, "locked"));

    if (file_exists(path.buf)) {

      struct strbuf lock_reason = STRBUF_INIT;

      if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)

        die_errno(_("failed to read '%s'"), path.buf);

      strbuf_trim(&lock_reason);

      wt->lock_reason = strbuf_detach(&lock_reason, NULL);

    } else

      wt->lock_reason = NULL;

    wt->lock_reason_valid = 1;

    strbuf_release(&path);

  }

  return wt->lock_reason;

}

const char *worktree_prune_reason(struct worktree *wt, timestamp_t expire)

{

  struct strbuf reason = STRBUF_INIT;

  char *path = NULL;

  if (is_main_worktree(wt))

    return NULL;

  if (wt->prune_reason_valid)

    return wt->prune_reason;

  if (should_prune_worktree(wt->id, &reason, &path, expire))

    wt->prune_reason = strbuf_detach(&reason, NULL);

  wt->prune_reason_valid = 1;

  strbuf_release(&reason);

  free(path);

  return wt->prune_reason;

}

/* convenient wrapper to deal with NULL strbuf */

__attribute__((format (printf, 2, 3)))

static void strbuf_addf_gently(struct strbuf *buf, const char *fmt, ...)

{

  va_list params;

  if (!buf)

    return;

  va_start(params, fmt);

  strbuf_vaddf(buf, fmt, params);

  va_end(params);

}

int validate_worktree(const struct worktree *wt, struct strbuf *errmsg,

          unsigned flags)

{

  struct strbuf wt_path = STRBUF_INIT;

  struct strbuf realpath = STRBUF_INIT;

  char *path = NULL;

  int err, ret = -1;

  strbuf_addf(&wt_path, "%s/.git", wt->path);

  if (is_main_worktree(wt)) {

    if (is_directory(wt_path.buf)) {

      ret = 0;

      goto done;

    }

    /*

     * Main worktree using .git file to point to the

     * repository would make it impossible to know where

     * the actual worktree is if this function is executed

     * from another worktree. No .git file support for now.

     */

    strbuf_addf_gently(errmsg,

           _("'%s' at main working tree is not the repository directory"),

           wt_path.buf);

    goto done;

  }

  /*

   * Make sure "gitdir" file points to a real .git file and that

   * file points back here.

   */

  if (!is_absolute_path(wt->path)) {

    strbuf_addf_gently(errmsg,

           _("'%s' file does not contain absolute path to the working tree location"),

           git_common_path("worktrees/%s/gitdir", wt->id));

    goto done;

  }

  if (flags & WT_VALIDATE_WORKTREE_MISSING_OK &&

      !file_exists(wt->path)) {

    ret = 0;

    goto done;

  }

  if (!file_exists(wt_path.buf)) {

    strbuf_addf_gently(errmsg, _("'%s' does not exist"), wt_path.buf);

    goto done;

  }

  path = xstrdup_or_null(read_gitfile_gently(wt_path.buf, &err));

  if (!path) {

    strbuf_addf_gently(errmsg, _("'%s' is not a .git file, error code %d"),

           wt_path.buf, err);

    goto done;

  }

  strbuf_realpath(&realpath, git_common_path("worktrees/%s", wt->id), 1);

  ret = fspathcmp(path, realpath.buf);

  if (ret)

    strbuf_addf_gently(errmsg, _("'%s' does not point back to '%s'"),

           wt->path, git_common_path("worktrees/%s", wt->id));

done:

  free(path);

  strbuf_release(&wt_path);

  strbuf_release(&realpath);

  return ret;

}

void update_worktree_location(struct worktree *wt, const char *path_)

{

  struct strbuf path = STRBUF_INIT;

  if (is_main_worktree(wt))

    BUG("can't relocate main worktree");

  strbuf_realpath(&path, path_, 1);

  if (fspathcmp(wt->path, path.buf)) {

    write_file(git_common_path("worktrees/%s/gitdir", wt->id),

         "%s/.git", path.buf);

    free(wt->path);

    wt->path = strbuf_detach(&path, NULL);

  }

  strbuf_release(&path);

}

int is_worktree_being_rebased(const struct worktree *wt,

            const char *target)

{

  struct wt_status_state state;

  int found_rebase;

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

  found_rebase = wt_status_check_rebase(wt, &state) &&

           (state.rebase_in_progress ||

      state.rebase_interactive_in_progress) &&

           state.branch &&

           skip_prefix(target, "refs/heads/", &target) &&

           !strcmp(state.branch, target);

  wt_status_state_free_buffers(&state);

  return found_rebase;

}

int is_worktree_being_bisected(const struct worktree *wt,

             const char *target)

{

  struct wt_status_state state;

  int found_bisect;

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

  found_bisect = wt_status_check_bisect(wt, &state) &&

           state.bisecting_from &&

           skip_prefix(target, "refs/heads/", &target) &&

           !strcmp(state.bisecting_from, target);

  wt_status_state_free_buffers(&state);

  return found_bisect;

}

/*

 * note: this function should be able to detect shared symref even if

 * HEAD is temporarily detached (e.g. in the middle of rebase or

 * bisect). New commands that do similar things should update this

 * function as well.

 */

int is_shared_symref(const struct worktree *wt, const char *symref,

         const char *target)

{

  const char *symref_target;

  struct ref_store *refs;

  int flags;

  if (wt->is_bare)

    return 0;

  if (wt->is_detached && !strcmp(symref, "HEAD")) {

    if (is_worktree_being_rebased(wt, target))

      return 1;

    if (is_worktree_being_bisected(wt, target))

      return 1;

  }

  refs = get_worktree_ref_store(wt);

  symref_target = refs_resolve_ref_unsafe(refs, symref, 0,

            NULL, &flags);

  if ((flags & REF_ISSYMREF) &&

      symref_target && !strcmp(symref_target, target))

    return 1;

  return 0;

}

const struct worktree *find_shared_symref(struct worktree **worktrees,

            const char *symref,

            const char *target)

{

  for (int i = 0; worktrees[i]; i++)

    if (is_shared_symref(worktrees[i], symref, target))

      return worktrees[i];

  return NULL;

}

int submodule_uses_worktrees(const char *path)

{

  char *submodule_gitdir;

  struct strbuf sb = STRBUF_INIT, err = STRBUF_INIT;

  DIR *dir;

  struct dirent *d;

  int ret = 0;

  struct repository_format format = REPOSITORY_FORMAT_INIT;

  submodule_gitdir = git_pathdup_submodule(path, "%s", "");

  if (!submodule_gitdir)

    return 0;

  /* The env would be set for the superproject. */

  get_common_dir_noenv(&sb, submodule_gitdir);

  free(submodule_gitdir);

  strbuf_addstr(&sb, "/config");

  read_repository_format(&format, sb.buf);

  if (verify_repository_format(&format, &err)) {

    strbuf_release(&err);

    strbuf_release(&sb);

    clear_repository_format(&format);

    return 1;

  }

  clear_repository_format(&format);

  strbuf_release(&err);

  /* Replace config by worktrees. */

  strbuf_setlen(&sb, sb.len - strlen("config"));

  strbuf_addstr(&sb, "worktrees");

  /* See if there is any file inside the worktrees directory. */

  dir = opendir(sb.buf);

  strbuf_release(&sb);

  if (!dir)

    return 0;

  d = readdir_skip_dot_and_dotdot(dir);

  if (d)

    ret = 1;

  closedir(dir);

  return ret;

}

void strbuf_worktree_ref(const struct worktree *wt,

       struct strbuf *sb,

       const char *refname)

{

  if (parse_worktree_ref(refname, NULL, NULL, NULL) ==

        REF_WORKTREE_CURRENT &&

      wt && !wt->is_current) {

    if (is_main_worktree(wt))

      strbuf_addstr(sb, "main-worktree/");

    else

      strbuf_addf(sb, "worktrees/%s/", wt->id);

  }

  strbuf_addstr(sb, refname);

}

int other_head_refs(each_ref_fn fn, void *cb_data)

{

  struct worktree **worktrees, **p;

  struct strbuf refname = STRBUF_INIT;

  int ret = 0;

  worktrees = get_worktrees();

  for (p = worktrees; *p; p++) {

    struct worktree *wt = *p;

    struct object_id oid;

    int flag;

    if (wt->is_current)

      continue;

    strbuf_reset(&refname);

    strbuf_worktree_ref(wt, &refname, "HEAD");

    if (refs_resolve_ref_unsafe(get_main_ref_store(the_repository),

              refname.buf,

              RESOLVE_REF_READING,

              &oid, &flag))

      ret = fn(refname.buf, NULL, &oid, flag, cb_data);

    if (ret)

      break;

  }

  free_worktrees(worktrees);

  strbuf_release(&refname);

  return ret;

}

/*

 * Repair worktree's /path/to/worktree/.git file if missing, corrupt, or not

 * pointing at <repo>/worktrees/<id>.

 */

static void repair_gitfile(struct worktree *wt,

         worktree_repair_fn fn, void *cb_data)

{

  struct strbuf dotgit = STRBUF_INIT;

  struct strbuf repo = STRBUF_INIT;

  char *backlink;

  const char *repair = NULL;

  int err;

  /* missing worktree can't be repaired */

  if (!file_exists(wt->path))

    return;

  if (!is_directory(wt->path)) {

    fn(1, wt->path, _("not a directory"), cb_data);

    return;

  }

  strbuf_realpath(&repo, git_common_path("worktrees/%s", wt->id), 1);

  strbuf_addf(&dotgit, "%s/.git", wt->path);

  backlink = xstrdup_or_null(read_gitfile_gently(dotgit.buf, &err));

  if (err == READ_GITFILE_ERR_NOT_A_FILE)

    fn(1, wt->path, _(".git is not a file"), cb_data);

  else if (err)

    repair = _(".git file broken");

  else if (fspathcmp(backlink, repo.buf))

    repair = _(".git file incorrect");

  if (repair) {

    fn(0, wt->path, repair, cb_data);

    write_file(dotgit.buf, "gitdir: %s", repo.buf);

  }

  free(backlink);

  strbuf_release(&repo);

  strbuf_release(&dotgit);

}

static void repair_noop(int iserr UNUSED,

      const char *path UNUSED,

      const char *msg UNUSED,

      void *cb_data UNUSED)

{

  /* nothing */

}

void repair_worktrees(worktree_repair_fn fn, void *cb_data)

{

  struct worktree **worktrees = get_worktrees_internal(1);

  struct worktree **wt = worktrees + 1; /* +1 skips main worktree */

  if (!fn)

    fn = repair_noop;

  for (; *wt; wt++)

    repair_gitfile(*wt, fn, cb_data);

  free_worktrees(worktrees);

}

static int is_main_worktree_path(const char *path)

{

  struct strbuf target = STRBUF_INIT;

  struct strbuf maindir = STRBUF_INIT;

  int cmp;

  strbuf_add_real_path(&target, path);

  strbuf_strip_suffix(&target, "/.git");

  strbuf_add_real_path(&maindir, get_git_common_dir());

  strbuf_strip_suffix(&maindir, "/.git");

  cmp = fspathcmp(maindir.buf, target.buf);

  strbuf_release(&maindir);

  strbuf_release(&target);

  return !cmp;

}

/*

 * If both the main worktree and linked worktree have been moved, then the

 * gitfile /path/to/worktree/.git won't point into the repository, thus we

 * won't know which <repo>/worktrees/<id>/gitdir to repair. However, we may

 * be able to infer the gitdir by manually reading /path/to/worktree/.git,

 * extracting the <id>, and checking if <repo>/worktrees/<id> exists.

 */

static char *infer_backlink(const char *gitfile)

{

  struct strbuf actual = STRBUF_INIT;

  struct strbuf inferred = STRBUF_INIT;

  const char *id;

  if (strbuf_read_file(&actual, gitfile, 0) < 0)

    goto error;

  if (!starts_with(actual.buf, "gitdir:"))

    goto error;

  if (!(id = find_last_dir_sep(actual.buf)))

    goto error;

  strbuf_trim(&actual);

  id++; /* advance past '/' to point at <id> */

  if (!*id)

    goto error;

  strbuf_git_common_path(&inferred, the_repository, "worktrees/%s", id);

  if (!is_directory(inferred.buf))

    goto error;

  strbuf_release(&actual);

  return strbuf_detach(&inferred, NULL);

error:

  strbuf_release(&actual);

  strbuf_release(&inferred);

  return NULL;

}

/*

 * Repair <repo>/worktrees/<id>/gitdir if missing, corrupt, or not pointing at

 * the worktree's path.

 */

void repair_worktree_at_path(const char *path,

           worktree_repair_fn fn, void *cb_data)

{

  struct strbuf dotgit = STRBUF_INIT;

  struct strbuf realdotgit = STRBUF_INIT;

  struct strbuf gitdir = STRBUF_INIT;

  struct strbuf olddotgit = STRBUF_INIT;

  char *backlink = NULL;

  const char *repair = NULL;

  int err;

  if (!fn)

    fn = repair_noop;

  if (is_main_worktree_path(path))

    goto done;

  strbuf_addf(&dotgit, "%s/.git", path);

  if (!strbuf_realpath(&realdotgit, dotgit.buf, 0)) {

    fn(1, path, _("not a valid path"), cb_data);

    goto done;

  }

  backlink = xstrdup_or_null(read_gitfile_gently(realdotgit.buf, &err));

  if (err == READ_GITFILE_ERR_NOT_A_FILE) {

    fn(1, realdotgit.buf, _("unable to locate repository; .git is not a file"), cb_data);

    goto done;

  } else if (err == READ_GITFILE_ERR_NOT_A_REPO) {

    if (!(backlink = infer_backlink(realdotgit.buf))) {

      fn(1, realdotgit.buf, _("unable to locate repository; .git file does not reference a repository"), cb_data);

      goto done;

    }

  } else if (err) {

    fn(1, realdotgit.buf, _("unable to locate repository; .git file broken"), cb_data);

    goto done;

  }

  strbuf_addf(&gitdir, "%s/gitdir", backlink);

  if (strbuf_read_file(&olddotgit, gitdir.buf, 0) < 0)

    repair = _("gitdir unreadable");

  else {

    strbuf_rtrim(&olddotgit);

    if (fspathcmp(olddotgit.buf, realdotgit.buf))

      repair = _("gitdir incorrect");

  }

  if (repair) {

    fn(0, gitdir.buf, repair, cb_data);

    write_file(gitdir.buf, "%s", realdotgit.buf);

  }

done:

  free(backlink);

  strbuf_release(&olddotgit);

  strbuf_release(&gitdir);

  strbuf_release(&realdotgit);

  strbuf_release(&dotgit);

}

int should_prune_worktree(const char *id, struct strbuf *reason, char **wtpath, timestamp_t expire)

{

  struct stat st;

  char *path;

  int fd;

  size_t len;

  ssize_t read_result;

  *wtpath = NULL;

  if (!is_directory(git_path("worktrees/%s", id))) {

    strbuf_addstr(reason, _("not a valid directory"));

    return 1;

  }

  if (file_exists(git_path("worktrees/%s/locked", id)))

    return 0;

  if (stat(git_path("worktrees/%s/gitdir", id), &st)) {

    strbuf_addstr(reason, _("gitdir file does not exist"));

    return 1;

  }

  fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);

  if (fd < 0) {

    strbuf_addf(reason, _("unable to read gitdir file (%s)"),

          strerror(errno));

    return 1;

  }

  len = xsize_t(st.st_size);

  path = xmallocz(len);

  read_result = read_in_full(fd, path, len);

  if (read_result < 0) {

    strbuf_addf(reason, _("unable to read gitdir file (%s)"),

          strerror(errno));

    close(fd);

    free(path);

    return 1;

  }

  close(fd);

  if (read_result != len) {

    strbuf_addf(reason,

          _("short read (expected %"PRIuMAX" bytes, read %"PRIuMAX")"),

          (uintmax_t)len, (uintmax_t)read_result);

    free(path);

    return 1;

  }

  while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))

    len--;

  if (!len) {

    strbuf_addstr(reason, _("invalid gitdir file"));

    free(path);

    return 1;

  }

  path[len] = '\0';

  if (!file_exists(path)) {

    if (stat(git_path("worktrees/%s/index", id), &st) ||

        st.st_mtime <= expire) {

      strbuf_addstr(reason, _("gitdir file points to non-existent location"));

      free(path);

      return 1;

    } else {

      *wtpath = path;

      return 0;

    }

  }

  *wtpath = path;

  return 0;

}

static int move_config_setting(const char *key, const char *value,

             const char *from_file, const char *to_file)

{

  if (git_config_set_in_file_gently(to_file, key, NULL, value))

    return error(_("unable to set %s in '%s'"), key, to_file);

  if (git_config_set_in_file_gently(from_file, key, NULL, NULL))

    return error(_("unable to unset %s in '%s'"), key, from_file);

  return 0;

}

int init_worktree_config(struct repository *r)

{

  int res = 0;

  int bare = 0;

  struct config_set cs = { { 0 } };

  const char *core_worktree;

  char *common_config_file;

  char *main_worktree_file;

  /*

   * If the extension is already enabled, then we can skip the

   * upgrade process.

   */

  if (r->repository_format_worktree_config)

    return 0;

  if ((res = git_config_set_gently("extensions.worktreeConfig", "true")))

    return error(_("failed to set extensions.worktreeConfig setting"));

  common_config_file = xstrfmt("%s/config", r->commondir);

  main_worktree_file = xstrfmt("%s/config.worktree", r->commondir);

  git_configset_init(&cs);

  git_configset_add_file(&cs, common_config_file);

  /*

   * If core.bare is true in the common config file, then we need to

   * move it to the main worktree's config file or it will break all

   * worktrees. If it is false, then leave it in place because it

   * _could_ be negating a global core.bare=true.

   */

  if (!git_configset_get_bool(&cs, "core.bare", &bare) && bare) {

    if ((res = move_config_setting("core.bare", "true",

                 common_config_file,

                 main_worktree_file)))

      goto cleanup;

  }

  /*

   * If core.worktree is set, then the main worktree is located

   * somewhere different than the parent of the common Git dir.

   * Relocate that value to avoid breaking all worktrees with this

   * upgrade to worktree config.

   */

  if (!git_configset_get_value(&cs, "core.worktree", &core_worktree, NULL)) {

    if ((res = move_config_setting("core.worktree", core_worktree,

                 common_config_file,

                 main_worktree_file)))

      goto cleanup;

  }

  /*

   * Ensure that we use worktree config for the remaining lifetime

   * of the current process.

   */

  r->repository_format_worktree_config = 1;

cleanup:

  git_configset_clear(&cs);

  free(common_config_file);

  free(main_worktree_file);

  return res;

}