1 files changed, 56 insertions, 78 deletions

diff --git a/worktree.c b/worktree.c
index fa7bc67a50..f5da7d286d 100644
--- a/worktree.c
+++ b/worktree.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "repository.h"
 #include "refs.h"
 #include "strbuf.h"
 #include "worktree.h"
@@ -19,54 +20,25 @@ void free_worktrees(struct worktree **worktrees)
 	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
+ * Update head_sha1, head_ref and is_detached of the given worktree
  */
-static void add_head_info(struct strbuf *head_ref, struct worktree *worktree)
+static void add_head_info(struct worktree *wt)
 {
-	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);
-		}
-	}
+	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;
 }
 
 /**
@@ -77,9 +49,7 @@ 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");
@@ -91,13 +61,10 @@ static struct worktree *get_main_worktree(void)
 	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);
+	add_head_info(worktree);
 
 	strbuf_release(&path);
 	strbuf_release(&worktree_path);
-	strbuf_release(&head_ref);
 	return worktree;
 }
 
@@ -106,13 +73,11 @@ 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);
+	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;
@@ -127,19 +92,14 @@ static struct worktree *get_linked_worktree(const char *id)
 	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);
+	add_head_info(worktree);
 
 done:
 	strbuf_release(&path);
 	strbuf_release(&worktree_path);
-	strbuf_release(&head_ref);
 	return worktree;
 }
 
@@ -250,16 +210,19 @@ struct worktree *find_worktree(struct worktree **list,
 {
 	struct worktree *wt;
 	char *path;
+	char *to_free = NULL;
 
 	if ((wt = find_worktree_by_suffix(list, arg)))
 		return wt;
 
-	arg = prefix_filename(prefix, strlen(prefix), arg);
+	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;
 }
 
@@ -334,8 +297,6 @@ 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;
 
@@ -345,6 +306,10 @@ const struct worktree *find_shared_symref(const char *symref,
 
 	for (i = 0; worktrees[i]; i++) {
 		struct worktree *wt = worktrees[i];
+		const char *symref_target;
+		struct ref_store *refs;
+		int flags;
+
 		if (wt->is_bare)
 			continue;
 
@@ -359,25 +324,16 @@ const struct worktree *find_shared_symref(const char *symref,
 			}
 		}
 
-		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)) {
+		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)) {
 			existing = wt;
 			break;
 		}
 	}
 
-	strbuf_release(&path);
-	strbuf_release(&sb);
-
 	return existing;
 }
 
@@ -396,6 +352,7 @@ int submodule_uses_worktrees(const char *path)
 
 	/* The env would be set for the superproject. */
 	get_common_dir_noenv(&sb, submodule_gitdir);
+	free(submodule_gitdir);
 
 	/*
 	 * The check below is only known to be good for repository format
@@ -415,7 +372,6 @@ int submodule_uses_worktrees(const char *path)
 	/* See if there is any file inside the worktrees directory. */
 	dir = opendir(sb.buf);
 	strbuf_release(&sb);
-	free(submodule_gitdir);
 
 	if (!dir)
 		return 0;
@@ -430,3 +386,25 @@ int submodule_uses_worktrees(const char *path)
 	closedir(dir);
 	return ret;
 }
+
+int other_head_refs(each_ref_fn fn, void *cb_data)
+{
+	struct worktree **worktrees, **p;
+	int ret = 0;
+
+	worktrees = get_worktrees(0);
+	for (p = worktrees; *p; p++) {
+		struct worktree *wt = *p;
+		struct ref_store *refs;
+
+		if (wt->is_current)
+			continue;
+
+		refs = get_worktree_ref_store(wt);
+		ret = refs_head_ref(refs, fn, cb_data);
+		if (ret)
+			break;
+	}
+	free_worktrees(worktrees);
+	return ret;
+}