diff options
Diffstat (limited to 'worktree.c')
| -rw-r--r-- | worktree.c | 435 |
1 files changed, 435 insertions, 0 deletions
diff --git a/worktree.c b/worktree.c new file mode 100644 index 0000000000..bae787cf8d --- /dev/null +++ b/worktree.c @@ -0,0 +1,435 @@ +#include "cache.h" +#include "refs.h" +#include "strbuf.h" +#include "worktree.h" +#include "dir.h" +#include "wt-status.h" + +void free_worktrees(struct worktree **worktrees) +{ + int i = 0; + + for (i = 0; worktrees[i]; i++) { + free(worktrees[i]->path); + free(worktrees[i]->id); + free(worktrees[i]->head_ref); + free(worktrees[i]->lock_reason); + free(worktrees[i]); + } + free (worktrees); +} + +/* + * read 'path_to_ref' into 'ref'. Also if is_detached is not NULL, + * set is_detached to 1 (0) if the ref is detached (is not detached). + * + * $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside $GIT_DIR so + * for linked worktrees, `resolve_ref_unsafe()` won't work (it uses + * git_path). Parse the ref ourselves. + * + * return -1 if the ref is not a proper ref, 0 otherwise (success) + */ +static int parse_ref(char *path_to_ref, struct strbuf *ref, int *is_detached) +{ + if (is_detached) + *is_detached = 0; + if (!strbuf_readlink(ref, path_to_ref, 0)) { + /* HEAD is symbolic link */ + if (!starts_with(ref->buf, "refs/") || + check_refname_format(ref->buf, 0)) + return -1; + } else if (strbuf_read_file(ref, path_to_ref, 0) >= 0) { + /* textual symref or detached */ + if (!starts_with(ref->buf, "ref:")) { + if (is_detached) + *is_detached = 1; + } else { + strbuf_remove(ref, 0, strlen("ref:")); + strbuf_trim(ref); + if (check_refname_format(ref->buf, 0)) + return -1; + } + } else + return -1; + return 0; +} + +/** + * Add the head_sha1 and head_ref (if not detached) to the given worktree + */ +static void add_head_info(struct strbuf *head_ref, struct worktree *worktree) +{ + if (head_ref->len) { + if (worktree->is_detached) { + get_sha1_hex(head_ref->buf, worktree->head_sha1); + } else { + resolve_ref_unsafe(head_ref->buf, 0, worktree->head_sha1, NULL); + worktree->head_ref = strbuf_detach(head_ref, NULL); + } + } +} + +/** + * get the main worktree + */ +static struct worktree *get_main_worktree(void) +{ + struct worktree *worktree = NULL; + struct strbuf path = STRBUF_INIT; + struct strbuf worktree_path = STRBUF_INIT; + struct strbuf head_ref = STRBUF_INIT; + int is_bare = 0; + int is_detached = 0; + + strbuf_add_absolute_path(&worktree_path, get_git_common_dir()); + is_bare = !strbuf_strip_suffix(&worktree_path, "/.git"); + if (is_bare) + strbuf_strip_suffix(&worktree_path, "/."); + + strbuf_addf(&path, "%s/HEAD", get_git_common_dir()); + + worktree = xcalloc(1, sizeof(*worktree)); + worktree->path = strbuf_detach(&worktree_path, NULL); + worktree->is_bare = is_bare; + worktree->is_detached = is_detached; + if (!parse_ref(path.buf, &head_ref, &is_detached)) + add_head_info(&head_ref, worktree); + + strbuf_release(&path); + strbuf_release(&worktree_path); + strbuf_release(&head_ref); + return worktree; +} + +static struct worktree *get_linked_worktree(const char *id) +{ + struct worktree *worktree = NULL; + struct strbuf path = STRBUF_INIT; + struct strbuf worktree_path = STRBUF_INIT; + struct strbuf head_ref = STRBUF_INIT; + int is_detached = 0; + + if (!id) + die("Missing linked worktree name"); + + strbuf_git_common_path(&path, "worktrees/%s/gitdir", id); + if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0) + /* invalid gitdir file */ + goto done; + + strbuf_rtrim(&worktree_path); + if (!strbuf_strip_suffix(&worktree_path, "/.git")) { + strbuf_reset(&worktree_path); + strbuf_add_absolute_path(&worktree_path, "."); + strbuf_strip_suffix(&worktree_path, "/."); + } + + strbuf_reset(&path); + strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id); + + if (parse_ref(path.buf, &head_ref, &is_detached) < 0) + goto done; + + worktree = xcalloc(1, sizeof(*worktree)); + worktree->path = strbuf_detach(&worktree_path, NULL); + worktree->id = xstrdup(id); + worktree->is_detached = is_detached; + add_head_info(&head_ref, worktree); + +done: + strbuf_release(&path); + strbuf_release(&worktree_path); + strbuf_release(&head_ref); + return worktree; +} + +static void mark_current_worktree(struct worktree **worktrees) +{ + char *git_dir = absolute_pathdup(get_git_dir()); + int i; + + for (i = 0; worktrees[i]; i++) { + struct worktree *wt = worktrees[i]; + const char *wt_git_dir = get_worktree_git_dir(wt); + + if (!fspathcmp(git_dir, absolute_path(wt_git_dir))) { + wt->is_current = 1; + break; + } + } + free(git_dir); +} + +static int compare_worktree(const void *a_, const void *b_) +{ + const struct worktree *const *a = a_; + const struct worktree *const *b = b_; + return fspathcmp((*a)->path, (*b)->path); +} + +struct worktree **get_worktrees(unsigned flags) +{ + 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(); + + strbuf_addf(&path, "%s/worktrees", get_git_common_dir()); + dir = opendir(path.buf); + strbuf_release(&path); + if (dir) { + while ((d = readdir(dir)) != NULL) { + struct worktree *linked = NULL; + if (is_dot_or_dotdot(d->d_name)) + continue; + + if ((linked = get_linked_worktree(d->d_name))) { + ALLOC_GROW(list, counter + 1, alloc); + list[counter++] = linked; + } + } + closedir(dir); + } + ALLOC_GROW(list, counter + 1, alloc); + list[counter] = NULL; + + if (flags & GWT_SORT_LINKED) + /* + * don't sort the first item (main worktree), which will + * always be the first + */ + QSORT(list + 1, counter - 1, compare_worktree); + + mark_current_worktree(list); + return list; +} + +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 *path; + char *to_free = NULL; + + if ((wt = find_worktree_by_suffix(list, arg))) + return wt; + + if (prefix) + arg = to_free = prefix_filename(prefix, arg); + path = real_pathdup(arg, 1); + for (; *list; list++) + if (!fspathcmp(path, real_path((*list)->path))) + break; + free(path); + free(to_free); + return *list; +} + +int is_main_worktree(const struct worktree *wt) +{ + return !wt->id; +} + +const char *is_worktree_locked(struct worktree *wt) +{ + assert(!is_main_worktree(wt)); + + if (!wt->lock_reason_valid) { + struct strbuf path = STRBUF_INIT; + + strbuf_addstr(&path, worktree_git_path(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; +} + +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 && + starts_with(target, "refs/heads/") && + !strcmp(state.branch, target + strlen("refs/heads/"))); + free(state.branch); + free(state.onto); + return found_rebase; +} + +int is_worktree_being_bisected(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_bisect(wt, &state) && + state.branch && + starts_with(target, "refs/heads/") && + !strcmp(state.branch, target + strlen("refs/heads/")); + free(state.branch); + return found_rebase; +} + +/* + * 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. + */ +const struct worktree *find_shared_symref(const char *symref, + const char *target) +{ + const struct worktree *existing = NULL; + struct strbuf path = STRBUF_INIT; + struct strbuf sb = STRBUF_INIT; + static struct worktree **worktrees; + int i = 0; + + if (worktrees) + free_worktrees(worktrees); + worktrees = get_worktrees(0); + + for (i = 0; worktrees[i]; i++) { + struct worktree *wt = worktrees[i]; + if (wt->is_bare) + continue; + + if (wt->is_detached && !strcmp(symref, "HEAD")) { + if (is_worktree_being_rebased(wt, target)) { + existing = wt; + break; + } + if (is_worktree_being_bisected(wt, target)) { + existing = wt; + break; + } + } + + strbuf_reset(&path); + strbuf_reset(&sb); + strbuf_addf(&path, "%s/%s", + get_worktree_git_dir(wt), + symref); + + if (parse_ref(path.buf, &sb, NULL)) { + continue; + } + + if (!strcmp(sb.buf, target)) { + existing = wt; + break; + } + } + + strbuf_release(&path); + strbuf_release(&sb); + + return existing; +} + +int submodule_uses_worktrees(const char *path) +{ + char *submodule_gitdir; + struct strbuf sb = STRBUF_INIT; + DIR *dir; + struct dirent *d; + int ret = 0; + struct repository_format format; + + 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); + + /* + * The check below is only known to be good for repository format + * version 0 at the time of writing this code. + */ + strbuf_addstr(&sb, "/config"); + read_repository_format(&format, sb.buf); + if (format.version != 0) { + strbuf_release(&sb); + return 1; + } + + /* 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); + free(submodule_gitdir); + + if (!dir) + return 0; + + while ((d = readdir(dir)) != NULL) { + if (is_dot_or_dotdot(d->d_name)) + continue; + + ret = 1; + break; + } + closedir(dir); + return ret; +} |