Adding upstream version 1:2.43.0.upstream/1%2.43.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 986 insertions, 0 deletions

diff --git a/builtin/branch.c b/builtin/branch.c
new file mode 100644
index 0000000..e7ee9bd
--- /dev/null
+++ b/builtin/branch.c
@@ -0,0 +1,986 @@
+/*
+ * Builtin "git branch"
+ *
+ * Copyright (c) 2006 Kristian Høgsberg <krh@redhat.com>
+ * Based on git-branch.sh by Junio C Hamano.
+ */
+
+#include "builtin.h"
+#include "config.h"
+#include "color.h"
+#include "editor.h"
+#include "environment.h"
+#include "refs.h"
+#include "commit.h"
+#include "gettext.h"
+#include "object-name.h"
+#include "remote.h"
+#include "parse-options.h"
+#include "branch.h"
+#include "diff.h"
+#include "path.h"
+#include "revision.h"
+#include "string-list.h"
+#include "column.h"
+#include "utf8.h"
+#include "wt-status.h"
+#include "ref-filter.h"
+#include "worktree.h"
+#include "help.h"
+#include "commit-reach.h"
+
+static const char * const builtin_branch_usage[] = {
+	N_("git branch [<options>] [-r | -a] [--merged] [--no-merged]"),
+	N_("git branch [<options>] [-f] [--recurse-submodules] <branch-name> [<start-point>]"),
+	N_("git branch [<options>] [-l] [<pattern>...]"),
+	N_("git branch [<options>] [-r] (-d | -D) <branch-name>..."),
+	N_("git branch [<options>] (-m | -M) [<old-branch>] <new-branch>"),
+	N_("git branch [<options>] (-c | -C) [<old-branch>] <new-branch>"),
+	N_("git branch [<options>] [-r | -a] [--points-at]"),
+	N_("git branch [<options>] [-r | -a] [--format]"),
+	NULL
+};
+
+static const char *head;
+static struct object_id head_oid;
+static int recurse_submodules = 0;
+static int submodule_propagate_branches = 0;
+static int omit_empty = 0;
+
+static int branch_use_color = -1;
+static char branch_colors[][COLOR_MAXLEN] = {
+	GIT_COLOR_RESET,
+	GIT_COLOR_NORMAL,       /* PLAIN */
+	GIT_COLOR_RED,          /* REMOTE */
+	GIT_COLOR_NORMAL,       /* LOCAL */
+	GIT_COLOR_GREEN,        /* CURRENT */
+	GIT_COLOR_BLUE,         /* UPSTREAM */
+	GIT_COLOR_CYAN,         /* WORKTREE */
+};
+enum color_branch {
+	BRANCH_COLOR_RESET = 0,
+	BRANCH_COLOR_PLAIN = 1,
+	BRANCH_COLOR_REMOTE = 2,
+	BRANCH_COLOR_LOCAL = 3,
+	BRANCH_COLOR_CURRENT = 4,
+	BRANCH_COLOR_UPSTREAM = 5,
+	BRANCH_COLOR_WORKTREE = 6
+};
+
+static const char *color_branch_slots[] = {
+	[BRANCH_COLOR_RESET]	= "reset",
+	[BRANCH_COLOR_PLAIN]	= "plain",
+	[BRANCH_COLOR_REMOTE]	= "remote",
+	[BRANCH_COLOR_LOCAL]	= "local",
+	[BRANCH_COLOR_CURRENT]	= "current",
+	[BRANCH_COLOR_UPSTREAM] = "upstream",
+	[BRANCH_COLOR_WORKTREE] = "worktree",
+};
+
+static struct string_list output = STRING_LIST_INIT_DUP;
+static unsigned int colopts;
+
+define_list_config_array(color_branch_slots);
+
+static int git_branch_config(const char *var, const char *value,
+			     const struct config_context *ctx, void *cb)
+{
+	const char *slot_name;
+
+	if (!strcmp(var, "branch.sort")) {
+		if (!value)
+			return config_error_nonbool(var);
+		string_list_append(cb, value);
+		return 0;
+	}
+
+	if (starts_with(var, "column."))
+		return git_column_config(var, value, "branch", &colopts);
+	if (!strcmp(var, "color.branch")) {
+		branch_use_color = git_config_colorbool(var, value);
+		return 0;
+	}
+	if (skip_prefix(var, "color.branch.", &slot_name)) {
+		int slot = LOOKUP_CONFIG(color_branch_slots, slot_name);
+		if (slot < 0)
+			return 0;
+		if (!value)
+			return config_error_nonbool(var);
+		return color_parse(value, branch_colors[slot]);
+	}
+	if (!strcmp(var, "submodule.recurse")) {
+		recurse_submodules = git_config_bool(var, value);
+		return 0;
+	}
+	if (!strcasecmp(var, "submodule.propagateBranches")) {
+		submodule_propagate_branches = git_config_bool(var, value);
+		return 0;
+	}
+
+	if (git_color_config(var, value, cb) < 0)
+		return -1;
+
+	return git_default_config(var, value, ctx, cb);
+}
+
+static const char *branch_get_color(enum color_branch ix)
+{
+	if (want_color(branch_use_color))
+		return branch_colors[ix];
+	return "";
+}
+
+static int branch_merged(int kind, const char *name,
+			 struct commit *rev, struct commit *head_rev)
+{
+	/*
+	 * This checks whether the merge bases of branch and HEAD (or
+	 * the other branch this branch builds upon) contains the
+	 * branch, which means that the branch has already been merged
+	 * safely to HEAD (or the other branch).
+	 */
+	struct commit *reference_rev = NULL;
+	const char *reference_name = NULL;
+	void *reference_name_to_free = NULL;
+	int merged;
+
+	if (kind == FILTER_REFS_BRANCHES) {
+		struct branch *branch = branch_get(name);
+		const char *upstream = branch_get_upstream(branch, NULL);
+		struct object_id oid;
+
+		if (upstream &&
+		    (reference_name = reference_name_to_free =
+		     resolve_refdup(upstream, RESOLVE_REF_READING,
+				    &oid, NULL)) != NULL)
+			reference_rev = lookup_commit_reference(the_repository,
+								&oid);
+	}
+	if (!reference_rev)
+		reference_rev = head_rev;
+
+	merged = reference_rev ? repo_in_merge_bases(the_repository, rev,
+						     reference_rev) : 0;
+
+	/*
+	 * After the safety valve is fully redefined to "check with
+	 * upstream, if any, otherwise with HEAD", we should just
+	 * return the result of the repo_in_merge_bases() above without
+	 * any of the following code, but during the transition period,
+	 * a gentle reminder is in order.
+	 */
+	if ((head_rev != reference_rev) &&
+	    (head_rev ? repo_in_merge_bases(the_repository, rev, head_rev) : 0) != merged) {
+		if (merged)
+			warning(_("deleting branch '%s' that has been merged to\n"
+				"         '%s', but not yet merged to HEAD"),
+				name, reference_name);
+		else
+			warning(_("not deleting branch '%s' that is not yet merged to\n"
+				"         '%s', even though it is merged to HEAD"),
+				name, reference_name);
+	}
+	free(reference_name_to_free);
+	return merged;
+}
+
+static int check_branch_commit(const char *branchname, const char *refname,
+			       const struct object_id *oid, struct commit *head_rev,
+			       int kinds, int force)
+{
+	struct commit *rev = lookup_commit_reference(the_repository, oid);
+	if (!force && !rev) {
+		error(_("couldn't look up commit object for '%s'"), refname);
+		return -1;
+	}
+	if (!force && !branch_merged(kinds, branchname, rev, head_rev)) {
+		error(_("the branch '%s' is not fully merged.\n"
+		      "If you are sure you want to delete it, "
+		      "run 'git branch -D %s'"), branchname, branchname);
+		return -1;
+	}
+	return 0;
+}
+
+static void delete_branch_config(const char *branchname)
+{
+	struct strbuf buf = STRBUF_INIT;
+	strbuf_addf(&buf, "branch.%s", branchname);
+	if (git_config_rename_section(buf.buf, NULL) < 0)
+		warning(_("update of config-file failed"));
+	strbuf_release(&buf);
+}
+
+static int delete_branches(int argc, const char **argv, int force, int kinds,
+			   int quiet)
+{
+	struct commit *head_rev = NULL;
+	struct object_id oid;
+	char *name = NULL;
+	const char *fmt;
+	int i;
+	int ret = 0;
+	int remote_branch = 0;
+	struct strbuf bname = STRBUF_INIT;
+	unsigned allowed_interpret;
+	struct string_list refs_to_delete = STRING_LIST_INIT_DUP;
+	struct string_list_item *item;
+	int branch_name_pos;
+	const char *fmt_remotes = "refs/remotes/%s";
+
+	switch (kinds) {
+	case FILTER_REFS_REMOTES:
+		fmt = fmt_remotes;
+		/* For subsequent UI messages */
+		remote_branch = 1;
+		allowed_interpret = INTERPRET_BRANCH_REMOTE;
+
+		force = 1;
+		break;
+	case FILTER_REFS_BRANCHES:
+		fmt = "refs/heads/%s";
+		allowed_interpret = INTERPRET_BRANCH_LOCAL;
+		break;
+	default:
+		die(_("cannot use -a with -d"));
+	}
+	branch_name_pos = strcspn(fmt, "%");
+
+	if (!force)
+		head_rev = lookup_commit_reference(the_repository, &head_oid);
+
+	for (i = 0; i < argc; i++, strbuf_reset(&bname)) {
+		char *target = NULL;
+		int flags = 0;
+
+		strbuf_branchname(&bname, argv[i], allowed_interpret);
+		free(name);
+		name = mkpathdup(fmt, bname.buf);
+
+		if (kinds == FILTER_REFS_BRANCHES) {
+			const char *path;
+			if ((path = branch_checked_out(name))) {
+				error(_("cannot delete branch '%s' "
+					"used by worktree at '%s'"),
+				      bname.buf, path);
+				ret = 1;
+				continue;
+			}
+		}
+
+		target = resolve_refdup(name,
+					RESOLVE_REF_READING
+					| RESOLVE_REF_NO_RECURSE
+					| RESOLVE_REF_ALLOW_BAD_NAME,
+					&oid, &flags);
+		if (!target) {
+			if (remote_branch) {
+				error(_("remote-tracking branch '%s' not found"), bname.buf);
+			} else {
+				char *virtual_name = mkpathdup(fmt_remotes, bname.buf);
+				char *virtual_target = resolve_refdup(virtual_name,
+							RESOLVE_REF_READING
+							| RESOLVE_REF_NO_RECURSE
+							| RESOLVE_REF_ALLOW_BAD_NAME,
+							&oid, &flags);
+				FREE_AND_NULL(virtual_name);
+
+				if (virtual_target)
+					error(_("branch '%s' not found.\n"
+						"Did you forget --remote?"),
+						bname.buf);
+				else
+					error(_("branch '%s' not found"), bname.buf);
+				FREE_AND_NULL(virtual_target);
+			}
+			ret = 1;
+			continue;
+		}
+
+		if (!(flags & (REF_ISSYMREF|REF_ISBROKEN)) &&
+		    check_branch_commit(bname.buf, name, &oid, head_rev, kinds,
+					force)) {
+			ret = 1;
+			goto next;
+		}
+
+		item = string_list_append(&refs_to_delete, name);
+		item->util = xstrdup((flags & REF_ISBROKEN) ? "broken"
+				    : (flags & REF_ISSYMREF) ? target
+				    : repo_find_unique_abbrev(the_repository, &oid, DEFAULT_ABBREV));
+
+	next:
+		free(target);
+	}
+
+	if (delete_refs(NULL, &refs_to_delete, REF_NO_DEREF))
+		ret = 1;
+
+	for_each_string_list_item(item, &refs_to_delete) {
+		char *describe_ref = item->util;
+		char *name = item->string;
+		if (!ref_exists(name)) {
+			char *refname = name + branch_name_pos;
+			if (!quiet)
+				printf(remote_branch
+					? _("Deleted remote-tracking branch %s (was %s).\n")
+					: _("Deleted branch %s (was %s).\n"),
+					name + branch_name_pos, describe_ref);
+
+			delete_branch_config(refname);
+		}
+		free(describe_ref);
+	}
+	string_list_clear(&refs_to_delete, 0);
+
+	free(name);
+	strbuf_release(&bname);
+
+	return ret;
+}
+
+static int calc_maxwidth(struct ref_array *refs, int remote_bonus)
+{
+	int i, max = 0;
+	for (i = 0; i < refs->nr; i++) {
+		struct ref_array_item *it = refs->items[i];
+		const char *desc = it->refname;
+		int w;
+
+		skip_prefix(it->refname, "refs/heads/", &desc);
+		skip_prefix(it->refname, "refs/remotes/", &desc);
+		if (it->kind == FILTER_REFS_DETACHED_HEAD) {
+			char *head_desc = get_head_description();
+			w = utf8_strwidth(head_desc);
+			free(head_desc);
+		} else
+			w = utf8_strwidth(desc);
+
+		if (it->kind == FILTER_REFS_REMOTES)
+			w += remote_bonus;
+		if (w > max)
+			max = w;
+	}
+	return max;
+}
+
+static const char *quote_literal_for_format(const char *s)
+{
+	static struct strbuf buf = STRBUF_INIT;
+
+	strbuf_reset(&buf);
+	while (strbuf_expand_step(&buf, &s))
+		strbuf_addstr(&buf, "%%");
+	return buf.buf;
+}
+
+static char *build_format(struct ref_filter *filter, int maxwidth, const char *remote_prefix)
+{
+	struct strbuf fmt = STRBUF_INIT;
+	struct strbuf local = STRBUF_INIT;
+	struct strbuf remote = STRBUF_INIT;
+
+	strbuf_addf(&local, "%%(if)%%(HEAD)%%(then)* %s%%(else)%%(if)%%(worktreepath)%%(then)+ %s%%(else)  %s%%(end)%%(end)",
+			branch_get_color(BRANCH_COLOR_CURRENT),
+			branch_get_color(BRANCH_COLOR_WORKTREE),
+			branch_get_color(BRANCH_COLOR_LOCAL));
+	strbuf_addf(&remote, "  %s",
+		    branch_get_color(BRANCH_COLOR_REMOTE));
+
+	if (filter->verbose) {
+		struct strbuf obname = STRBUF_INIT;
+
+		if (filter->abbrev < 0)
+			strbuf_addf(&obname, "%%(objectname:short)");
+		else if (!filter->abbrev)
+			strbuf_addf(&obname, "%%(objectname)");
+		else
+			strbuf_addf(&obname, "%%(objectname:short=%d)", filter->abbrev);
+
+		strbuf_addf(&local, "%%(align:%d,left)%%(refname:lstrip=2)%%(end)", maxwidth);
+		strbuf_addstr(&local, branch_get_color(BRANCH_COLOR_RESET));
+		strbuf_addf(&local, " %s ", obname.buf);
+
+		if (filter->verbose > 1)
+		{
+			strbuf_addf(&local, "%%(if:notequals=*)%%(HEAD)%%(then)%%(if)%%(worktreepath)%%(then)(%s%%(worktreepath)%s) %%(end)%%(end)",
+				    branch_get_color(BRANCH_COLOR_WORKTREE), branch_get_color(BRANCH_COLOR_RESET));
+			strbuf_addf(&local, "%%(if)%%(upstream)%%(then)[%s%%(upstream:short)%s%%(if)%%(upstream:track)"
+				    "%%(then): %%(upstream:track,nobracket)%%(end)] %%(end)%%(contents:subject)",
+				    branch_get_color(BRANCH_COLOR_UPSTREAM), branch_get_color(BRANCH_COLOR_RESET));
+		}
+		else
+			strbuf_addf(&local, "%%(if)%%(upstream:track)%%(then)%%(upstream:track) %%(end)%%(contents:subject)");
+
+		strbuf_addf(&remote, "%%(align:%d,left)%s%%(refname:lstrip=2)%%(end)%s"
+			    "%%(if)%%(symref)%%(then) -> %%(symref:short)"
+			    "%%(else) %s %%(contents:subject)%%(end)",
+			    maxwidth, quote_literal_for_format(remote_prefix),
+			    branch_get_color(BRANCH_COLOR_RESET), obname.buf);
+		strbuf_release(&obname);
+	} else {
+		strbuf_addf(&local, "%%(refname:lstrip=2)%s%%(if)%%(symref)%%(then) -> %%(symref:short)%%(end)",
+			    branch_get_color(BRANCH_COLOR_RESET));
+		strbuf_addf(&remote, "%s%%(refname:lstrip=2)%s%%(if)%%(symref)%%(then) -> %%(symref:short)%%(end)",
+			    quote_literal_for_format(remote_prefix),
+			    branch_get_color(BRANCH_COLOR_RESET));
+	}
+
+	strbuf_addf(&fmt, "%%(if:notequals=refs/remotes)%%(refname:rstrip=-2)%%(then)%s%%(else)%s%%(end)", local.buf, remote.buf);
+
+	strbuf_release(&local);
+	strbuf_release(&remote);
+	return strbuf_detach(&fmt, NULL);
+}
+
+static void print_ref_list(struct ref_filter *filter, struct ref_sorting *sorting,
+			   struct ref_format *format, struct string_list *output)
+{
+	int i;
+	struct ref_array array;
+	struct strbuf out = STRBUF_INIT;
+	struct strbuf err = STRBUF_INIT;
+	int maxwidth = 0;
+	const char *remote_prefix = "";
+	char *to_free = NULL;
+
+	/*
+	 * If we are listing more than just remote branches,
+	 * then remote branches will have a "remotes/" prefix.
+	 * We need to account for this in the width.
+	 */
+	if (filter->kind != FILTER_REFS_REMOTES)
+		remote_prefix = "remotes/";
+
+	memset(&array, 0, sizeof(array));
+
+	filter_refs(&array, filter, filter->kind);
+
+	if (filter->verbose)
+		maxwidth = calc_maxwidth(&array, strlen(remote_prefix));
+
+	if (!format->format)
+		format->format = to_free = build_format(filter, maxwidth, remote_prefix);
+	format->use_color = branch_use_color;
+
+	if (verify_ref_format(format))
+		die(_("unable to parse format string"));
+
+	filter_ahead_behind(the_repository, format, &array);
+	ref_array_sort(sorting, &array);
+
+	for (i = 0; i < array.nr; i++) {
+		strbuf_reset(&err);
+		strbuf_reset(&out);
+		if (format_ref_array_item(array.items[i], format, &out, &err))
+			die("%s", err.buf);
+		if (column_active(colopts)) {
+			assert(!filter->verbose && "--column and --verbose are incompatible");
+			 /* format to a string_list to let print_columns() do its job */
+			string_list_append(output, out.buf);
+		} else {
+			fwrite(out.buf, 1, out.len, stdout);
+			if (out.len || !omit_empty)
+				putchar('\n');
+		}
+	}
+
+	strbuf_release(&err);
+	strbuf_release(&out);
+	ref_array_clear(&array);
+	free(to_free);
+}
+
+static void print_current_branch_name(void)
+{
+	int flags;
+	const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, &flags);
+	const char *shortname;
+	if (!refname)
+		die(_("could not resolve HEAD"));
+	else if (!(flags & REF_ISSYMREF))
+		return;
+	else if (skip_prefix(refname, "refs/heads/", &shortname))
+		puts(shortname);
+	else
+		die(_("HEAD (%s) points outside of refs/heads/"), refname);
+}
+
+static void reject_rebase_or_bisect_branch(struct worktree **worktrees,
+					   const char *target)
+{
+	int i;
+
+	for (i = 0; worktrees[i]; i++) {
+		struct worktree *wt = worktrees[i];
+
+		if (!wt->is_detached)
+			continue;
+
+		if (is_worktree_being_rebased(wt, target))
+			die(_("branch %s is being rebased at %s"),
+			    target, wt->path);
+
+		if (is_worktree_being_bisected(wt, target))
+			die(_("branch %s is being bisected at %s"),
+			    target, wt->path);
+	}
+}
+
+/*
+ * Update all per-worktree HEADs pointing at the old ref to point the new ref.
+ * This will be used when renaming a branch. Returns 0 if successful, non-zero
+ * otherwise.
+ */
+static int replace_each_worktree_head_symref(struct worktree **worktrees,
+					     const char *oldref, const char *newref,
+					     const char *logmsg)
+{
+	int ret = 0;
+	int i;
+
+	for (i = 0; worktrees[i]; i++) {
+		struct ref_store *refs;
+
+		if (worktrees[i]->is_detached)
+			continue;
+		if (!worktrees[i]->head_ref)
+			continue;
+		if (strcmp(oldref, worktrees[i]->head_ref))
+			continue;
+
+		refs = get_worktree_ref_store(worktrees[i]);
+		if (refs_create_symref(refs, "HEAD", newref, logmsg))
+			ret = error(_("HEAD of working tree %s is not updated"),
+				    worktrees[i]->path);
+	}
+
+	return ret;
+}
+
+#define IS_HEAD 1
+#define IS_ORPHAN 2
+
+static void copy_or_rename_branch(const char *oldname, const char *newname, int copy, int force)
+{
+	struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT;
+	struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT;
+	const char *interpreted_oldname = NULL;
+	const char *interpreted_newname = NULL;
+	int recovery = 0, oldref_usage = 0;
+	struct worktree **worktrees = get_worktrees();
+
+	if (strbuf_check_branch_ref(&oldref, oldname)) {
+		/*
+		 * Bad name --- this could be an attempt to rename a
+		 * ref that we used to allow to be created by accident.
+		 */
+		if (ref_exists(oldref.buf))
+			recovery = 1;
+		else
+			die(_("invalid branch name: '%s'"), oldname);
+	}
+
+	for (int i = 0; worktrees[i]; i++) {
+		struct worktree *wt = worktrees[i];
+
+		if (wt->head_ref && !strcmp(oldref.buf, wt->head_ref)) {
+			oldref_usage |= IS_HEAD;
+			if (is_null_oid(&wt->head_oid))
+				oldref_usage |= IS_ORPHAN;
+			break;
+		}
+	}
+
+	if ((copy || !(oldref_usage & IS_HEAD)) && !ref_exists(oldref.buf)) {
+		if (oldref_usage & IS_HEAD)
+			die(_("no commit on branch '%s' yet"), oldname);
+		else
+			die(_("no branch named '%s'"), oldname);
+	}
+
+	/*
+	 * A command like "git branch -M currentbranch currentbranch" cannot
+	 * cause the worktree to become inconsistent with HEAD, so allow it.
+	 */
+	if (!strcmp(oldname, newname))
+		validate_branchname(newname, &newref);
+	else
+		validate_new_branchname(newname, &newref, force);
+
+	reject_rebase_or_bisect_branch(worktrees, oldref.buf);
+
+	if (!skip_prefix(oldref.buf, "refs/heads/", &interpreted_oldname) ||
+	    !skip_prefix(newref.buf, "refs/heads/", &interpreted_newname)) {
+		BUG("expected prefix missing for refs");
+	}
+
+	if (copy)
+		strbuf_addf(&logmsg, "Branch: copied %s to %s",
+			    oldref.buf, newref.buf);
+	else
+		strbuf_addf(&logmsg, "Branch: renamed %s to %s",
+			    oldref.buf, newref.buf);
+
+	if (!copy && !(oldref_usage & IS_ORPHAN) &&
+	    rename_ref(oldref.buf, newref.buf, logmsg.buf))
+		die(_("branch rename failed"));
+	if (copy && copy_existing_ref(oldref.buf, newref.buf, logmsg.buf))
+		die(_("branch copy failed"));
+
+	if (recovery) {
+		if (copy)
+			warning(_("created a copy of a misnamed branch '%s'"),
+				interpreted_oldname);
+		else
+			warning(_("renamed a misnamed branch '%s' away"),
+				interpreted_oldname);
+	}
+
+	if (!copy && (oldref_usage & IS_HEAD) &&
+	    replace_each_worktree_head_symref(worktrees, oldref.buf, newref.buf,
+					      logmsg.buf))
+		die(_("branch renamed to %s, but HEAD is not updated"), newname);
+
+	strbuf_release(&logmsg);
+
+	strbuf_addf(&oldsection, "branch.%s", interpreted_oldname);
+	strbuf_addf(&newsection, "branch.%s", interpreted_newname);
+	if (!copy && git_config_rename_section(oldsection.buf, newsection.buf) < 0)
+		die(_("branch is renamed, but update of config-file failed"));
+	if (copy && strcmp(interpreted_oldname, interpreted_newname) && git_config_copy_section(oldsection.buf, newsection.buf) < 0)
+		die(_("branch is copied, but update of config-file failed"));
+	strbuf_release(&oldref);
+	strbuf_release(&newref);
+	strbuf_release(&oldsection);
+	strbuf_release(&newsection);
+	free_worktrees(worktrees);
+}
+
+static GIT_PATH_FUNC(edit_description, "EDIT_DESCRIPTION")
+
+static int edit_branch_description(const char *branch_name)
+{
+	int exists;
+	struct strbuf buf = STRBUF_INIT;
+	struct strbuf name = STRBUF_INIT;
+
+	exists = !read_branch_desc(&buf, branch_name);
+	if (!buf.len || buf.buf[buf.len-1] != '\n')
+		strbuf_addch(&buf, '\n');
+	strbuf_commented_addf(&buf, comment_line_char,
+		    _("Please edit the description for the branch\n"
+		      "  %s\n"
+		      "Lines starting with '%c' will be stripped.\n"),
+		    branch_name, comment_line_char);
+	write_file_buf(edit_description(), buf.buf, buf.len);
+	strbuf_reset(&buf);
+	if (launch_editor(edit_description(), &buf, NULL)) {
+		strbuf_release(&buf);
+		return -1;
+	}
+	strbuf_stripspace(&buf, comment_line_char);
+
+	strbuf_addf(&name, "branch.%s.description", branch_name);
+	if (buf.len || exists)
+		git_config_set(name.buf, buf.len ? buf.buf : NULL);
+	strbuf_release(&name);
+	strbuf_release(&buf);
+
+	return 0;
+}
+
+int cmd_branch(int argc, const char **argv, const char *prefix)
+{
+	/* possible actions */
+	int delete = 0, rename = 0, copy = 0, list = 0,
+	    unset_upstream = 0, show_current = 0, edit_description = 0;
+	const char *new_upstream = NULL;
+	int noncreate_actions = 0;
+	/* possible options */
+	int reflog = 0, quiet = 0, icase = 0, force = 0,
+	    recurse_submodules_explicit = 0;
+	enum branch_track track;
+	struct ref_filter filter = REF_FILTER_INIT;
+	static struct ref_sorting *sorting;
+	struct string_list sorting_options = STRING_LIST_INIT_DUP;
+	struct ref_format format = REF_FORMAT_INIT;
+
+	struct option options[] = {
+		OPT_GROUP(N_("Generic options")),
+		OPT__VERBOSE(&filter.verbose,
+			N_("show hash and subject, give twice for upstream branch")),
+		OPT__QUIET(&quiet, N_("suppress informational messages")),
+		OPT_CALLBACK_F('t', "track",  &track, "(direct|inherit)",
+			N_("set branch tracking configuration"),
+			PARSE_OPT_OPTARG,
+			parse_opt_tracking_mode),
+		OPT_SET_INT_F(0, "set-upstream", &track, N_("do not use"),
+			BRANCH_TRACK_OVERRIDE, PARSE_OPT_HIDDEN),
+		OPT_STRING('u', "set-upstream-to", &new_upstream, N_("upstream"), N_("change the upstream info")),
+		OPT_BOOL(0, "unset-upstream", &unset_upstream, N_("unset the upstream info")),
+		OPT__COLOR(&branch_use_color, N_("use colored output")),
+		OPT_SET_INT_F('r', "remotes",     &filter.kind, N_("act on remote-tracking branches"),
+			      FILTER_REFS_REMOTES,
+			      PARSE_OPT_NONEG),
+		OPT_CONTAINS(&filter.with_commit, N_("print only branches that contain the commit")),
+		OPT_NO_CONTAINS(&filter.no_commit, N_("print only branches that don't contain the commit")),
+		OPT_WITH(&filter.with_commit, N_("print only branches that contain the commit")),
+		OPT_WITHOUT(&filter.no_commit, N_("print only branches that don't contain the commit")),
+		OPT__ABBREV(&filter.abbrev),
+
+		OPT_GROUP(N_("Specific git-branch actions:")),
+		OPT_SET_INT_F('a', "all", &filter.kind, N_("list both remote-tracking and local branches"),
+			      FILTER_REFS_REMOTES | FILTER_REFS_BRANCHES,
+			      PARSE_OPT_NONEG),
+		OPT_BIT('d', "delete", &delete, N_("delete fully merged branch"), 1),
+		OPT_BIT('D', NULL, &delete, N_("delete branch (even if not merged)"), 2),
+		OPT_BIT('m', "move", &rename, N_("move/rename a branch and its reflog"), 1),
+		OPT_BIT('M', NULL, &rename, N_("move/rename a branch, even if target exists"), 2),
+		OPT_BOOL(0, "omit-empty",  &omit_empty,
+			N_("do not output a newline after empty formatted refs")),
+		OPT_BIT('c', "copy", &copy, N_("copy a branch and its reflog"), 1),
+		OPT_BIT('C', NULL, &copy, N_("copy a branch, even if target exists"), 2),
+		OPT_BOOL('l', "list", &list, N_("list branch names")),
+		OPT_BOOL(0, "show-current", &show_current, N_("show current branch name")),
+		OPT_BOOL(0, "create-reflog", &reflog, N_("create the branch's reflog")),
+		OPT_BOOL(0, "edit-description", &edit_description,
+			 N_("edit the description for the branch")),
+		OPT__FORCE(&force, N_("force creation, move/rename, deletion"), PARSE_OPT_NOCOMPLETE),
+		OPT_MERGED(&filter, N_("print only branches that are merged")),
+		OPT_NO_MERGED(&filter, N_("print only branches that are not merged")),
+		OPT_COLUMN(0, "column", &colopts, N_("list branches in columns")),
+		OPT_REF_SORT(&sorting_options),
+		OPT_CALLBACK(0, "points-at", &filter.points_at, N_("object"),
+			N_("print only branches of the object"), parse_opt_object_name),
+		OPT_BOOL('i', "ignore-case", &icase, N_("sorting and filtering are case insensitive")),
+		OPT_BOOL(0, "recurse-submodules", &recurse_submodules_explicit, N_("recurse through submodules")),
+		OPT_STRING(  0 , "format", &format.format, N_("format"), N_("format to use for the output")),
+		OPT_END(),
+	};
+
+	setup_ref_filter_porcelain_msg();
+
+	filter.kind = FILTER_REFS_BRANCHES;
+	filter.abbrev = -1;
+
+	if (argc == 2 && !strcmp(argv[1], "-h"))
+		usage_with_options(builtin_branch_usage, options);
+
+	git_config(git_branch_config, &sorting_options);
+
+	track = git_branch_track;
+
+	head = resolve_refdup("HEAD", 0, &head_oid, NULL);
+	if (!head)
+		die(_("failed to resolve HEAD as a valid ref"));
+	if (!strcmp(head, "HEAD"))
+		filter.detached = 1;
+	else if (!skip_prefix(head, "refs/heads/", &head))
+		die(_("HEAD not found below refs/heads!"));
+
+	argc = parse_options(argc, argv, prefix, options, builtin_branch_usage,
+			     0);
+
+	if (!delete && !rename && !copy && !edit_description && !new_upstream &&
+	    !show_current && !unset_upstream && argc == 0)
+		list = 1;
+
+	if (filter.with_commit || filter.no_commit ||
+	    filter.reachable_from || filter.unreachable_from || filter.points_at.nr)
+		list = 1;
+
+	noncreate_actions = !!delete + !!rename + !!copy + !!new_upstream +
+			    !!show_current + !!list + !!edit_description +
+			    !!unset_upstream;
+	if (noncreate_actions > 1)
+		usage_with_options(builtin_branch_usage, options);
+
+	if (recurse_submodules_explicit) {
+		if (!submodule_propagate_branches)
+			die(_("branch with --recurse-submodules can only be used if submodule.propagateBranches is enabled"));
+		if (noncreate_actions)
+			die(_("--recurse-submodules can only be used to create branches"));
+	}
+
+	recurse_submodules =
+		(recurse_submodules || recurse_submodules_explicit) &&
+		submodule_propagate_branches;
+
+	if (filter.abbrev == -1)
+		filter.abbrev = DEFAULT_ABBREV;
+	filter.ignore_case = icase;
+
+	finalize_colopts(&colopts, -1);
+	if (filter.verbose) {
+		if (explicitly_enable_column(colopts))
+			die(_("options '%s' and '%s' cannot be used together"), "--column", "--verbose");
+		colopts = 0;
+	}
+
+	if (force) {
+		delete *= 2;
+		rename *= 2;
+		copy *= 2;
+	}
+
+	if (list)
+		setup_auto_pager("branch", 1);
+
+	UNLEAK(sorting_options);
+
+	if (delete) {
+		if (!argc)
+			die(_("branch name required"));
+		return delete_branches(argc, argv, delete > 1, filter.kind, quiet);
+	} else if (show_current) {
+		print_current_branch_name();
+		return 0;
+	} else if (list) {
+		/*  git branch --list also shows HEAD when it is detached */
+		if ((filter.kind & FILTER_REFS_BRANCHES) && filter.detached)
+			filter.kind |= FILTER_REFS_DETACHED_HEAD;
+		filter.name_patterns = argv;
+		/*
+		 * If no sorting parameter is given then we default to sorting
+		 * by 'refname'. This would give us an alphabetically sorted
+		 * array with the 'HEAD' ref at the beginning followed by
+		 * local branches 'refs/heads/...' and finally remote-tracking
+		 * branches 'refs/remotes/...'.
+		 */
+		sorting = ref_sorting_options(&sorting_options);
+		ref_sorting_set_sort_flags_all(sorting, REF_SORTING_ICASE, icase);
+		ref_sorting_set_sort_flags_all(
+			sorting, REF_SORTING_DETACHED_HEAD_FIRST, 1);
+		print_ref_list(&filter, sorting, &format, &output);
+		print_columns(&output, colopts, NULL);
+		string_list_clear(&output, 0);
+		ref_sorting_release(sorting);
+		ref_filter_clear(&filter);
+		return 0;
+	} else if (edit_description) {
+		const char *branch_name;
+		struct strbuf branch_ref = STRBUF_INIT;
+		struct strbuf buf = STRBUF_INIT;
+		int ret = 1; /* assume failure */
+
+		if (!argc) {
+			if (filter.detached)
+				die(_("cannot give description to detached HEAD"));
+			branch_name = head;
+		} else if (argc == 1) {
+			strbuf_branchname(&buf, argv[0], INTERPRET_BRANCH_LOCAL);
+			branch_name = buf.buf;
+		} else {
+			die(_("cannot edit description of more than one branch"));
+		}
+
+		strbuf_addf(&branch_ref, "refs/heads/%s", branch_name);
+		if (!ref_exists(branch_ref.buf))
+			error((!argc || branch_checked_out(branch_ref.buf))
+			      ? _("no commit on branch '%s' yet")
+			      : _("no branch named '%s'"),
+			      branch_name);
+		else if (!edit_branch_description(branch_name))
+			ret = 0; /* happy */
+
+		strbuf_release(&branch_ref);
+		strbuf_release(&buf);
+
+		return ret;
+	} else if (copy || rename) {
+		if (!argc)
+			die(_("branch name required"));
+		else if ((argc == 1) && filter.detached)
+			die(copy? _("cannot copy the current branch while not on any")
+				: _("cannot rename the current branch while not on any"));
+		else if (argc == 1)
+			copy_or_rename_branch(head, argv[0], copy, copy + rename > 1);
+		else if (argc == 2)
+			copy_or_rename_branch(argv[0], argv[1], copy, copy + rename > 1);
+		else
+			die(copy? _("too many branches for a copy operation")
+				: _("too many arguments for a rename operation"));
+	} else if (new_upstream) {
+		struct branch *branch;
+		struct strbuf buf = STRBUF_INIT;
+
+		if (!argc)
+			branch = branch_get(NULL);
+		else if (argc == 1) {
+			strbuf_branchname(&buf, argv[0], INTERPRET_BRANCH_LOCAL);
+			branch = branch_get(buf.buf);
+		} else
+			die(_("too many arguments to set new upstream"));
+
+		if (!branch) {
+			if (!argc || !strcmp(argv[0], "HEAD"))
+				die(_("could not set upstream of HEAD to %s when "
+				      "it does not point to any branch"),
+				    new_upstream);
+			die(_("no such branch '%s'"), argv[0]);
+		}
+
+		if (!ref_exists(branch->refname)) {
+			if (!argc || branch_checked_out(branch->refname))
+				die(_("no commit on branch '%s' yet"), branch->name);
+			die(_("branch '%s' does not exist"), branch->name);
+		}
+
+		dwim_and_setup_tracking(the_repository, branch->name,
+					new_upstream, BRANCH_TRACK_OVERRIDE,
+					quiet);
+		strbuf_release(&buf);
+	} else if (unset_upstream) {
+		struct branch *branch;
+		struct strbuf buf = STRBUF_INIT;
+
+		if (!argc)
+			branch = branch_get(NULL);
+		else if (argc == 1) {
+			strbuf_branchname(&buf, argv[0], INTERPRET_BRANCH_LOCAL);
+			branch = branch_get(buf.buf);
+		} else
+			die(_("too many arguments to unset upstream"));
+
+		if (!branch) {
+			if (!argc || !strcmp(argv[0], "HEAD"))
+				die(_("could not unset upstream of HEAD when "
+				      "it does not point to any branch"));
+			die(_("no such branch '%s'"), argv[0]);
+		}
+
+		if (!branch_has_merge_config(branch))
+			die(_("branch '%s' has no upstream information"), branch->name);
+
+		strbuf_reset(&buf);
+		strbuf_addf(&buf, "branch.%s.remote", branch->name);
+		git_config_set_multivar(buf.buf, NULL, NULL, CONFIG_FLAGS_MULTI_REPLACE);
+		strbuf_reset(&buf);
+		strbuf_addf(&buf, "branch.%s.merge", branch->name);
+		git_config_set_multivar(buf.buf, NULL, NULL, CONFIG_FLAGS_MULTI_REPLACE);
+		strbuf_release(&buf);
+	} else if (!noncreate_actions && argc > 0 && argc <= 2) {
+		const char *branch_name = argv[0];
+		const char *start_name = argc == 2 ? argv[1] : head;
+
+		if (filter.kind != FILTER_REFS_BRANCHES)
+			die(_("the -a, and -r, options to 'git branch' do not take a branch name.\n"
+				  "Did you mean to use: -a|-r --list <pattern>?"));
+
+		if (track == BRANCH_TRACK_OVERRIDE)
+			die(_("the '--set-upstream' option is no longer supported. Please use '--track' or '--set-upstream-to' instead"));
+
+		if (recurse_submodules) {
+			create_branches_recursively(the_repository, branch_name,
+						    start_name, NULL, force,
+						    reflog, quiet, track, 0);
+			return 0;
+		}
+		create_branch(the_repository, branch_name, start_name, force, 0,
+			      reflog, quiet, track, 0);
+	} else
+		usage_with_options(builtin_branch_usage, options);
+
+	return 0;
+}