Merge branch 'nd/resolve-ref'

* nd/resolve-ref:
  Rename resolve_ref() to resolve_ref_unsafe()
  Convert resolve_ref+xstrdup to new resolve_refdup function
  revert: convert resolve_ref() to read_ref_full()

branch.c

@@ -181,7 +181,7 @@ int validate_new_branchname(const char *name, struct strbuf *ref,
 		const char *head;
 		unsigned char sha1[20];
 
-		head = resolve_ref("HEAD", sha1, 0, NULL);
+		head = resolve_ref_unsafe("HEAD", sha1, 0, NULL);
 		if (!is_bare_repository() && head && !strcmp(head, ref->buf))
 			die("Cannot force update the current branch.");
 	}

builtin/branch.c

@@ -104,6 +104,7 @@ static int branch_merged(int kind, const char *name,
 	 */
 	struct commit *reference_rev = NULL;
 	const char *reference_name = NULL;
+	void *reference_name_to_free = NULL;
 	int merged;
 
 	if (kind == REF_LOCAL_BRANCH) {
@@ -114,11 +115,9 @@ static int branch_merged(int kind, const char *name,
 		    branch->merge &&
 		    branch->merge[0] &&
 		    branch->merge[0]->dst &&
-		    (reference_name =
-		     resolve_ref(branch->merge[0]->dst, sha1, 1, NULL)) != NULL) {
-			reference_name = xstrdup(reference_name);
+		    (reference_name = reference_name_to_free =
+		     resolve_refdup(branch->merge[0]->dst, sha1, 1, NULL)) != NULL)
 			reference_rev = lookup_commit_reference(sha1);
-		}
 	}
 	if (!reference_rev)
 		reference_rev = head_rev;
@@ -143,7 +142,7 @@ static int branch_merged(int kind, const char *name,
 				"         '%s', even though it is merged to HEAD."),
 				name, reference_name);
 	}
-	free((char *)reference_name);
+	free(reference_name_to_free);
 	return merged;
 }
 
@@ -253,7 +252,7 @@ static char *resolve_symref(const char *src, const char *prefix)
 	int flag;
 	const char *dst, *cp;
 
-	dst = resolve_ref(src, sha1, 0, &flag);
+	dst = resolve_ref_unsafe(src, sha1, 0, &flag);
 	if (!(dst && (flag & REF_ISSYMREF)))
 		return NULL;
 	if (prefix && (cp = skip_prefix(dst, prefix)))
@@ -738,10 +737,9 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 
 	track = git_branch_track;
 
-	head = resolve_ref("HEAD", head_sha1, 0, NULL);
+	head = resolve_refdup("HEAD", head_sha1, 0, NULL);
 	if (!head)
 		die(_("Failed to resolve HEAD as a valid ref."));
-	head = xstrdup(head);
 	if (!strcmp(head, "HEAD")) {
 		detached = 1;
 	} else {

builtin/checkout.c

@@ -705,17 +705,14 @@ static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
 {
 	int ret = 0;
 	struct branch_info old;
+	void *path_to_free;
 	unsigned char rev[20];
 	int flag;
 	memset(&old, 0, sizeof(old));
-	old.path = resolve_ref("HEAD", rev, 0, &flag);
-	if (old.path)
-		old.path = xstrdup(old.path);
+	old.path = path_to_free = resolve_refdup("HEAD", rev, 0, &flag);
 	old.commit = lookup_commit_reference_gently(rev, 1);
-	if (!(flag & REF_ISSYMREF)) {
-		free((char *)old.path);
+	if (!(flag & REF_ISSYMREF))
 		old.path = NULL;
-	}
 
 	if (old.path && !prefixcmp(old.path, "refs/heads/"))
 		old.name = old.path + strlen("refs/heads/");
@@ -729,16 +726,18 @@ static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
 	}
 
 	ret = merge_working_tree(opts, &old, new);
-	if (ret)
+	if (ret) {
+		free(path_to_free);
 		return ret;
+	}
 
 	if (!opts->quiet && !old.path && old.commit && new->commit != old.commit)
 		orphaned_commit_warning(old.commit);
 
 	update_refs_for_switch(opts, &old, new);
 
 	ret = post_checkout_hook(old.commit, new->commit, 1);
-	free((char *)old.path);
+	free(path_to_free);
 	return ret || opts->writeout_error;
 }
 

builtin/commit.c

@@ -1304,7 +1304,7 @@ static void print_summary(const char *prefix, const unsigned char *sha1,
 	rev.diffopt.break_opt = 0;
 	diff_setup_done(&rev.diffopt);
 
-	head = resolve_ref("HEAD", junk_sha1, 0, NULL);
+	head = resolve_ref_unsafe("HEAD", junk_sha1, 0, NULL);
 	printf("[%s%s ",
 		!prefixcmp(head, "refs/heads/") ?
 			head + 11 :

builtin/fmt-merge-msg.c

@@ -372,14 +372,15 @@ int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
 	int i = 0, pos = 0;
 	unsigned char head_sha1[20];
 	const char *current_branch;
+	void *current_branch_to_free;
 
 	/* get current branch */
-	current_branch = resolve_ref("HEAD", head_sha1, 1, NULL);
+	current_branch = current_branch_to_free =
+		resolve_refdup("HEAD", head_sha1, 1, NULL);
 	if (!current_branch)
 		die("No current branch");
 	if (!prefixcmp(current_branch, "refs/heads/"))
 		current_branch += 11;
-	current_branch = xstrdup(current_branch);
 
 	/* get a line */
 	while (pos < in->len) {
@@ -421,7 +422,7 @@ int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
 	}
 
 	strbuf_complete_line(out);
-	free((char *)current_branch);
+	free(current_branch_to_free);
 	return 0;
 }
 

builtin/for-each-ref.c

@@ -628,11 +628,8 @@ static void populate_value(struct refinfo *ref)
 
 	if (need_symref && (ref->flag & REF_ISSYMREF) && !ref->symref) {
 		unsigned char unused1[20];
-		const char *symref;
-		symref = resolve_ref(ref->refname, unused1, 1, NULL);
-		if (symref)
-			ref->symref = xstrdup(symref);
-		else
+		ref->symref = resolve_refdup(ref->refname, unused1, 1, NULL);
+		if (!ref->symref)
 			ref->symref = "";
 	}
 

builtin/fsck.c

@@ -563,7 +563,7 @@ static int fsck_head_link(void)
 	if (verbose)
 		fprintf(stderr, "Checking HEAD link\n");
 
-	head_points_at = resolve_ref("HEAD", head_sha1, 0, &flag);
+	head_points_at = resolve_ref_unsafe("HEAD", head_sha1, 0, &flag);
 	if (!head_points_at)
 		return error("Invalid HEAD");
 	if (!strcmp(head_points_at, "HEAD"))

builtin/log.c

@@ -1040,7 +1040,7 @@ static char *find_branch_name(struct rev_info *rev)
 	if (positive < 0)
 		return NULL;
 	strbuf_addf(&buf, "refs/heads/%s", rev->cmdline.rev[positive].name);
-	branch = resolve_ref(buf.buf, branch_sha1, 1, NULL);
+	branch = resolve_ref_unsafe(buf.buf, branch_sha1, 1, NULL);
 	if (!branch ||
 	    prefixcmp(branch, "refs/heads/") ||
 	    hashcmp(rev->cmdline.rev[positive].item->sha1, branch_sha1))
@@ -1268,7 +1268,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 
 			rev.pending.objects[0].item->flags |= UNINTERESTING;
 			add_head_to_pending(&rev);
-			ref = resolve_ref("HEAD", sha1, 1, NULL);
+			ref = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
 			if (ref && !prefixcmp(ref, "refs/heads/"))
 				branch_name = xstrdup(ref + strlen("refs/heads/"));
 			else

builtin/merge.c

@@ -1100,6 +1100,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 	struct commit_list *common = NULL;
 	const char *best_strategy = NULL, *wt_strategy = NULL;
 	struct commit_list **remotes = &remoteheads;
+	void *branch_to_free;
 
 	if (argc == 2 && !strcmp(argv[1], "-h"))
 		usage_with_options(builtin_merge_usage, builtin_merge_options);
@@ -1108,12 +1109,9 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 	 * Check if we are _not_ on a detached HEAD, i.e. if there is a
 	 * current branch.
 	 */
-	branch = resolve_ref("HEAD", head_sha1, 0, &flag);
-	if (branch) {
-		if (!prefixcmp(branch, "refs/heads/"))
-			branch += 11;
-		branch = xstrdup(branch);
-	}
+	branch = branch_to_free = resolve_refdup("HEAD", head_sha1, 0, &flag);
+	if (branch && !prefixcmp(branch, "refs/heads/"))
+		branch += 11;
 	if (!branch || is_null_sha1(head_sha1))
 		head_commit = NULL;
 	else
@@ -1524,6 +1522,6 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 		ret = suggest_conflicts(option_renormalize);
 
 done:
-	free((char *)branch);
+	free(branch_to_free);
 	return ret;
 }

builtin/notes.c

@@ -804,6 +804,7 @@ static int merge_commit(struct notes_merge_options *o)
 	struct notes_tree *t;
 	struct commit *partial;
 	struct pretty_print_context pretty_ctx;
+	void *local_ref_to_free;
 	int ret;
 
 	/*
@@ -826,10 +827,10 @@ static int merge_commit(struct notes_merge_options *o)
 	t = xcalloc(1, sizeof(struct notes_tree));
 	init_notes(t, "NOTES_MERGE_PARTIAL", combine_notes_overwrite, 0);
 
-	o->local_ref = resolve_ref("NOTES_MERGE_REF", sha1, 0, NULL);
+	o->local_ref = local_ref_to_free =
+		resolve_refdup("NOTES_MERGE_REF", sha1, 0, NULL);
 	if (!o->local_ref)
 		die("Failed to resolve NOTES_MERGE_REF");
-	o->local_ref = xstrdup(o->local_ref);
 
 	if (notes_merge_commit(o, t, partial, sha1))
 		die("Failed to finalize notes merge");
@@ -846,7 +847,7 @@ static int merge_commit(struct notes_merge_options *o)
 	free_notes(t);
 	strbuf_release(&msg);
 	ret = merge_abort(o);
-	free((char *)o->local_ref);
+	free(local_ref_to_free);
 	return ret;
 }
 

builtin/receive-pack.c

@@ -37,6 +37,7 @@ static int prefer_ofs_delta = 1;
 static int auto_update_server_info;
 static int auto_gc = 1;
 static const char *head_name;
+static void *head_name_to_free;
 static int sent_capabilities;
 
 static enum deny_action parse_deny_action(const char *var, const char *value)
@@ -571,7 +572,7 @@ static void check_aliased_update(struct command *cmd, struct string_list *list)
 	int flag;
 
 	strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
-	dst_name = resolve_ref(buf.buf, sha1, 0, &flag);
+	dst_name = resolve_ref_unsafe(buf.buf, sha1, 0, &flag);
 	strbuf_release(&buf);
 
 	if (!(flag & REF_ISSYMREF))
@@ -695,10 +696,8 @@ static void execute_commands(struct command *commands, const char *unpacker_erro
 
 	check_aliased_updates(commands);
 
-	free((char *)head_name);
-	head_name = resolve_ref("HEAD", sha1, 0, NULL);
-	if (head_name)
-		head_name = xstrdup(head_name);
+	free(head_name_to_free);
+	head_name = head_name_to_free = resolve_refdup("HEAD", sha1, 0, NULL);
 
 	for (cmd = commands; cmd; cmd = cmd->next)
 		if (!cmd->skip_update)

builtin/remote.c

@@ -573,7 +573,7 @@ static int read_remote_branches(const char *refname,
 	strbuf_addf(&buf, "refs/remotes/%s/", rename->old);
 	if (!prefixcmp(refname, buf.buf)) {
 		item = string_list_append(rename->remote_branches, xstrdup(refname));
-		symref = resolve_ref(refname, orig_sha1, 1, &flag);
+		symref = resolve_ref_unsafe(refname, orig_sha1, 1, &flag);
 		if (flag & REF_ISSYMREF)
 			item->util = xstrdup(symref);
 		else

builtin/revert.c

@@ -903,7 +903,7 @@ static int rollback_single_pick(void)
 	if (!file_exists(git_path("CHERRY_PICK_HEAD")) &&
 	    !file_exists(git_path("REVERT_HEAD")))
 		return error(_("no cherry-pick or revert in progress"));
-	if (!resolve_ref("HEAD", head_sha1, 0, NULL))
+	if (read_ref_full("HEAD", head_sha1, 0, NULL))
 		return error(_("cannot resolve HEAD"));
 	if (is_null_sha1(head_sha1))
 		return error(_("cannot abort from a branch yet to be born"));

builtin/show-branch.c

@@ -726,10 +726,8 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 
 		if (ac == 0) {
 			static const char *fake_av[2];
-			const char *refname;
 
-			refname = resolve_ref("HEAD", sha1, 1, NULL);
-			fake_av[0] = xstrdup(refname);
+			fake_av[0] = resolve_refdup("HEAD", sha1, 1, NULL);
 			fake_av[1] = NULL;
 			av = fake_av;
 			ac = 1;
@@ -791,7 +789,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 		}
 	}
 
-	head_p = resolve_ref("HEAD", head_sha1, 1, NULL);
+	head_p = resolve_ref_unsafe("HEAD", head_sha1, 1, NULL);
 	if (head_p) {
 		head_len = strlen(head_p);
 		memcpy(head, head_p, head_len + 1);

builtin/symbolic-ref.c

@@ -12,7 +12,7 @@ static void check_symref(const char *HEAD, int quiet)
 {
 	unsigned char sha1[20];
 	int flag;
-	const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
+	const char *refs_heads_master = resolve_ref_unsafe(HEAD, sha1, 0, &flag);
 
 	if (!refs_heads_master)
 		die("No such ref: %s", HEAD);

cache.h

@@ -867,7 +867,8 @@ extern int read_ref(const char *filename, unsigned char *sha1);
  *
  * errno is sometimes set on errors, but not always.
  */
-extern const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag);
+extern const char *resolve_ref_unsafe(const char *ref, unsigned char *sha1, int reading, int *flag);
+extern char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag);
 
 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);

reflog-walk.c

@@ -50,11 +50,12 @@ static struct complete_reflogs *read_complete_reflog(const char *ref)
 	for_each_reflog_ent(ref, read_one_reflog, reflogs);
 	if (reflogs->nr == 0) {
 		unsigned char sha1[20];
-		const char *name = resolve_ref(ref, sha1, 1, NULL);
+		const char *name;
+		void *name_to_free;
+		name = name_to_free = resolve_refdup(ref, sha1, 1, NULL);
 		if (name) {
-			name = xstrdup(name);
 			for_each_reflog_ent(name, read_one_reflog, reflogs);
-			free((char *)name);
+			free(name_to_free);
 		}
 	}
 	if (reflogs->nr == 0) {
@@ -171,11 +172,11 @@ int add_reflog_for_walk(struct reflog_walk_info *info,
 	else {
 		if (*branch == '\0') {
 			unsigned char sha1[20];
-			const char *head = resolve_ref("HEAD", sha1, 0, NULL);
-			if (!head)
-				die ("No current branch");
 			free(branch);
-			branch = xstrdup(head);
+			branch = resolve_refdup("HEAD", sha1, 0, NULL);
+			if (!branch)
+				die ("No current branch");
+
 		}
 		reflogs = read_complete_reflog(branch);
 		if (!reflogs || reflogs->nr == 0) {