From e1c1ab9d25864e8de0009f3f3149ec4386a14bf8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nguy=E1=BB=85n=20Th=C3=A1i=20Ng=E1=BB=8Dc=20Duy?=
 <pclouds@gmail.com>
Date: Fri, 12 Jun 2015 17:49:24 +0700
Subject: [PATCH 1/2] checkout: don't check worktrees when not necessary
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When --patch or pathspecs are passed to git checkout, the working tree
will not be switching branch, so there's no need to check if the branch
that we are running checkout on is already checked out.

Original-patch-by: Spencer Baugh <sbaugh@catern.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/checkout.c     | 23 +++++++++++------------
 t/t2025-checkout-to.sh |  8 ++++++++
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 8b2bf2093b..2079aa4170 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -1085,7 +1085,6 @@ static int parse_branchname_arg(int argc, const char **argv,
 {
 	struct tree **source_tree = &opts->source_tree;
 	const char **new_branch = &opts->new_branch;
-	int force_detach = opts->force_detach;
 	int argcount = 0;
 	unsigned char branch_rev[20];
 	const char *arg;
@@ -1206,17 +1205,6 @@ static int parse_branchname_arg(int argc, const char **argv,
 	else
 		new->path = NULL; /* not an existing branch */
 
-	if (new->path && !force_detach && !*new_branch) {
-		unsigned char sha1[20];
-		int flag;
-		char *head_ref = resolve_refdup("HEAD", 0, sha1, &flag);
-		if (head_ref &&
-		    (!(flag & REF_ISSYMREF) || strcmp(head_ref, new->path)) &&
-		    !opts->ignore_other_worktrees)
-			check_linked_checkouts(new);
-		free(head_ref);
-	}
-
 	new->commit = lookup_commit_reference_gently(rev, 1);
 	if (!new->commit) {
 		/* not a commit */
@@ -1296,6 +1284,17 @@ static int checkout_branch(struct checkout_opts *opts,
 		die(_("Cannot switch branch to a non-commit '%s'"),
 		    new->name);
 
+	if (new->path && !opts->force_detach && !opts->new_branch) {
+		unsigned char sha1[20];
+		int flag;
+		char *head_ref = resolve_refdup("HEAD", 0, sha1, &flag);
+		if (head_ref &&
+		    (!(flag & REF_ISSYMREF) || strcmp(head_ref, new->path)) &&
+		    !opts->ignore_other_worktrees)
+			check_linked_checkouts(new);
+		free(head_ref);
+	}
+
 	if (opts->new_worktree)
 		return prepare_linked_checkout(opts, new);
 
diff --git a/t/t2025-checkout-to.sh b/t/t2025-checkout-to.sh
index f8e4df4818..a8d93366f6 100755
--- a/t/t2025-checkout-to.sh
+++ b/t/t2025-checkout-to.sh
@@ -28,6 +28,14 @@ test_expect_success 'checkout --to refuses to checkout locked branch' '
 	! test -d .git/worktrees/zere
 '
 
+test_expect_success 'checking out paths not complaining about linked checkouts' '
+	(
+	cd existing_empty &&
+	echo dirty >>init.t &&
+	git checkout master -- init.t
+	)
+'
+
 test_expect_success 'checkout --to a new worktree' '
 	git rev-parse HEAD >expect &&
 	git checkout --detach --to here master &&

From df0b6cfbda88144714541664fb501146d6465a82 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nguy=E1=BB=85n=20Th=C3=A1i=20Ng=E1=BB=8Dc=20Duy?=
 <pclouds@gmail.com>
Date: Mon, 29 Jun 2015 19:51:18 +0700
Subject: [PATCH 2/2] worktree: new place for "git prune --worktrees"
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Commit 23af91d (prune: strategies for linked checkouts - 2014-11-30)
adds "--worktrees" to "git prune" without realizing that "git prune" is
for object database only. This patch moves the same functionality to a
new command "git worktree".

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 .gitignore                        |   1 +
 Documentation/git-prune.txt       |   3 -
 Documentation/git-worktree.txt    |  48 +++++++++++
 Makefile                          |   1 +
 builtin.h                         |   1 +
 builtin/gc.c                      |   2 +-
 builtin/prune.c                   |  99 ----------------------
 builtin/worktree.c                | 133 ++++++++++++++++++++++++++++++
 command-list.txt                  |   1 +
 git.c                             |   1 +
 t/t2026-prune-linked-checkouts.sh |  22 ++---
 11 files changed, 198 insertions(+), 114 deletions(-)
 create mode 100644 Documentation/git-worktree.txt
 create mode 100644 builtin/worktree.c

diff --git a/.gitignore b/.gitignore
index a05241916c..b527248ff0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -171,6 +171,7 @@
 /git-verify-tag
 /git-web--browse
 /git-whatchanged
+/git-worktree
 /git-write-tree
 /git-core-*/?*
 /gitweb/GITWEB-BUILD-OPTIONS
diff --git a/Documentation/git-prune.txt b/Documentation/git-prune.txt
index 1cf3bed4ab..7a493c80f7 100644
--- a/Documentation/git-prune.txt
+++ b/Documentation/git-prune.txt
@@ -48,9 +48,6 @@ OPTIONS
 --expire <time>::
 	Only expire loose objects older than <time>.
 
---worktrees::
-	Prune dead working tree information in $GIT_DIR/worktrees.
-
 <head>...::
 	In addition to objects
 	reachable from any of our references, keep objects
diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
new file mode 100644
index 0000000000..41103e5485
--- /dev/null
+++ b/Documentation/git-worktree.txt
@@ -0,0 +1,48 @@
+git-worktree(1)
+===============
+
+NAME
+----
+git-worktree - Manage multiple worktrees
+
+
+SYNOPSIS
+--------
+[verse]
+'git worktree prune' [-n] [-v] [--expire <expire>]
+
+DESCRIPTION
+-----------
+
+Manage multiple worktrees attached to the same repository. These are
+created by the command `git checkout --to`.
+
+COMMANDS
+--------
+prune::
+
+Prune working tree information in $GIT_DIR/worktrees.
+
+OPTIONS
+-------
+
+-n::
+--dry-run::
+	Do not remove anything; just report what it would
+	remove.
+
+-v::
+--verbose::
+	Report all removals.
+
+--expire <time>::
+	Only expire unused worktrees older than <time>.
+
+SEE ALSO
+--------
+
+linkgit:git-checkout[1]
+
+GIT
+---
+Part of the linkgit:git[1] suite
diff --git a/Makefile b/Makefile
index 827006ba61..bfdc908771 100644
--- a/Makefile
+++ b/Makefile
@@ -886,6 +886,7 @@ BUILTIN_OBJS += builtin/var.o
 BUILTIN_OBJS += builtin/verify-commit.o
 BUILTIN_OBJS += builtin/verify-pack.o
 BUILTIN_OBJS += builtin/verify-tag.o
+BUILTIN_OBJS += builtin/worktree.o
 BUILTIN_OBJS += builtin/write-tree.o
 
 GITLIBS = $(LIB_FILE) $(XDIFF_LIB)
diff --git a/builtin.h b/builtin.h
index b87df70f96..9e04f979bc 100644
--- a/builtin.h
+++ b/builtin.h
@@ -133,6 +133,7 @@ extern int cmd_verify_commit(int argc, const char **argv, const char *prefix);
 extern int cmd_verify_tag(int argc, const char **argv, const char *prefix);
 extern int cmd_version(int argc, const char **argv, const char *prefix);
 extern int cmd_whatchanged(int argc, const char **argv, const char *prefix);
+extern int cmd_worktree(int argc, const char **argv, const char *prefix);
 extern int cmd_write_tree(int argc, const char **argv, const char *prefix);
 extern int cmd_verify_pack(int argc, const char **argv, const char *prefix);
 extern int cmd_show_ref(int argc, const char **argv, const char *prefix);
diff --git a/builtin/gc.c b/builtin/gc.c
index fa87ad355c..44b206acad 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -293,7 +293,7 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
 	argv_array_pushl(&reflog, "reflog", "expire", "--all", NULL);
 	argv_array_pushl(&repack, "repack", "-d", "-l", NULL);
 	argv_array_pushl(&prune, "prune", "--expire", NULL);
-	argv_array_pushl(&prune_worktrees, "prune", "--worktrees", "--expire", NULL);
+	argv_array_pushl(&prune_worktrees, "worktree", "prune", "--expire", NULL);
 	argv_array_pushl(&rerere, "rerere", "gc", NULL);
 
 	gc_config();
diff --git a/builtin/prune.c b/builtin/prune.c
index 86282b2447..75f3b83aa1 100644
--- a/builtin/prune.c
+++ b/builtin/prune.c
@@ -6,7 +6,6 @@
 #include "reachable.h"
 #include "parse-options.h"
 #include "progress.h"
-#include "dir.h"
 
 static const char * const prune_usage[] = {
 	N_("git prune [-n] [-v] [--expire <time>] [--] [<head>...]"),
@@ -76,95 +75,6 @@ static int prune_subdir(int nr, const char *path, void *data)
 	return 0;
 }
 
-static int prune_worktree(const char *id, struct strbuf *reason)
-{
-	struct stat st;
-	char *path;
-	int fd, len;
-
-	if (!is_directory(git_path("worktrees/%s", id))) {
-		strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
-		return 1;
-	}
-	if (file_exists(git_path("worktrees/%s/locked", id)))
-		return 0;
-	if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
-		strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
-		return 1;
-	}
-	fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
-	if (fd < 0) {
-		strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
-			    id, strerror(errno));
-		return 1;
-	}
-	len = st.st_size;
-	path = xmalloc(len + 1);
-	read_in_full(fd, path, len);
-	close(fd);
-	while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
-		len--;
-	if (!len) {
-		strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
-		free(path);
-		return 1;
-	}
-	path[len] = '\0';
-	if (!file_exists(path)) {
-		struct stat st_link;
-		free(path);
-		/*
-		 * the repo is moved manually and has not been
-		 * accessed since?
-		 */
-		if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
-		    st_link.st_nlink > 1)
-			return 0;
-		if (st.st_mtime <= expire) {
-			strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
-			return 1;
-		} else {
-			return 0;
-		}
-	}
-	free(path);
-	return 0;
-}
-
-static void prune_worktrees(void)
-{
-	struct strbuf reason = STRBUF_INIT;
-	struct strbuf path = STRBUF_INIT;
-	DIR *dir = opendir(git_path("worktrees"));
-	struct dirent *d;
-	int ret;
-	if (!dir)
-		return;
-	while ((d = readdir(dir)) != NULL) {
-		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
-			continue;
-		strbuf_reset(&reason);
-		if (!prune_worktree(d->d_name, &reason))
-			continue;
-		if (show_only || verbose)
-			printf("%s\n", reason.buf);
-		if (show_only)
-			continue;
-		strbuf_reset(&path);
-		strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
-		ret = remove_dir_recursively(&path, 0);
-		if (ret < 0 && errno == ENOTDIR)
-			ret = unlink(path.buf);
-		if (ret)
-			error(_("failed to remove: %s"), strerror(errno));
-	}
-	closedir(dir);
-	if (!show_only)
-		rmdir(git_path("worktrees"));
-	strbuf_release(&reason);
-	strbuf_release(&path);
-}
-
 /*
  * Write errors (particularly out of space) can result in
  * failed temporary packs (and more rarely indexes and other
@@ -191,12 +101,10 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
 {
 	struct rev_info revs;
 	struct progress *progress = NULL;
-	int do_prune_worktrees = 0;
 	const struct option options[] = {
 		OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 		OPT__VERBOSE(&verbose, N_("report pruned objects")),
 		OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
-		OPT_BOOL(0, "worktrees", &do_prune_worktrees, N_("prune .git/worktrees")),
 		OPT_EXPIRY_DATE(0, "expire", &expire,
 				N_("expire objects older than <time>")),
 		OPT_END()
@@ -210,13 +118,6 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
 
 	argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
 
-	if (do_prune_worktrees) {
-		if (argc)
-			die(_("--worktrees does not take extra arguments"));
-		prune_worktrees();
-		return 0;
-	}
-
 	while (argc--) {
 		unsigned char sha1[20];
 		const char *name = *argv++;
diff --git a/builtin/worktree.c b/builtin/worktree.c
new file mode 100644
index 0000000000..2a729c661c
--- /dev/null
+++ b/builtin/worktree.c
@@ -0,0 +1,133 @@
+#include "cache.h"
+#include "builtin.h"
+#include "dir.h"
+#include "parse-options.h"
+
+static const char * const worktree_usage[] = {
+	N_("git worktree prune [<options>]"),
+	NULL
+};
+
+static int show_only;
+static int verbose;
+static unsigned long expire;
+
+static int prune_worktree(const char *id, struct strbuf *reason)
+{
+	struct stat st;
+	char *path;
+	int fd, len;
+
+	if (!is_directory(git_path("worktrees/%s", id))) {
+		strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
+		return 1;
+	}
+	if (file_exists(git_path("worktrees/%s/locked", id)))
+		return 0;
+	if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
+		strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
+		return 1;
+	}
+	fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
+	if (fd < 0) {
+		strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
+			    id, strerror(errno));
+		return 1;
+	}
+	len = st.st_size;
+	path = xmalloc(len + 1);
+	read_in_full(fd, path, len);
+	close(fd);
+	while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
+		len--;
+	if (!len) {
+		strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
+		free(path);
+		return 1;
+	}
+	path[len] = '\0';
+	if (!file_exists(path)) {
+		struct stat st_link;
+		free(path);
+		/*
+		 * the repo is moved manually and has not been
+		 * accessed since?
+		 */
+		if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
+		    st_link.st_nlink > 1)
+			return 0;
+		if (st.st_mtime <= expire) {
+			strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
+			return 1;
+		} else {
+			return 0;
+		}
+	}
+	free(path);
+	return 0;
+}
+
+static void prune_worktrees(void)
+{
+	struct strbuf reason = STRBUF_INIT;
+	struct strbuf path = STRBUF_INIT;
+	DIR *dir = opendir(git_path("worktrees"));
+	struct dirent *d;
+	int ret;
+	if (!dir)
+		return;
+	while ((d = readdir(dir)) != NULL) {
+		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
+			continue;
+		strbuf_reset(&reason);
+		if (!prune_worktree(d->d_name, &reason))
+			continue;
+		if (show_only || verbose)
+			printf("%s\n", reason.buf);
+		if (show_only)
+			continue;
+		strbuf_reset(&path);
+		strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
+		ret = remove_dir_recursively(&path, 0);
+		if (ret < 0 && errno == ENOTDIR)
+			ret = unlink(path.buf);
+		if (ret)
+			error(_("failed to remove: %s"), strerror(errno));
+	}
+	closedir(dir);
+	if (!show_only)
+		rmdir(git_path("worktrees"));
+	strbuf_release(&reason);
+	strbuf_release(&path);
+}
+
+static int prune(int ac, const char **av, const char *prefix)
+{
+	struct option options[] = {
+		OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
+		OPT__VERBOSE(&verbose, N_("report pruned objects")),
+		OPT_EXPIRY_DATE(0, "expire", &expire,
+				N_("expire objects older than <time>")),
+		OPT_END()
+	};
+
+	expire = ULONG_MAX;
+	ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
+	if (ac)
+		usage_with_options(worktree_usage, options);
+	prune_worktrees();
+	return 0;
+}
+
+int cmd_worktree(int ac, const char **av, const char *prefix)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+
+	if (ac < 2)
+		usage_with_options(worktree_usage, options);
+	if (!strcmp(av[1], "prune"))
+		return prune(ac - 1, av + 1, prefix);
+	usage_with_options(worktree_usage, options);
+}
diff --git a/command-list.txt b/command-list.txt
index f1eae0810d..5fc74b94b8 100644
--- a/command-list.txt
+++ b/command-list.txt
@@ -138,4 +138,5 @@ git-verify-pack                         plumbinginterrogators
 git-verify-tag                          ancillaryinterrogators
 gitweb                                  ancillaryinterrogators
 git-whatchanged                         ancillaryinterrogators
+git-worktree                            mainporcelain
 git-write-tree                          plumbingmanipulators
diff --git a/git.c b/git.c
index 160896a943..f22783894c 100644
--- a/git.c
+++ b/git.c
@@ -484,6 +484,7 @@ static struct cmd_struct commands[] = {
 	{ "verify-tag", cmd_verify_tag, RUN_SETUP },
 	{ "version", cmd_version },
 	{ "whatchanged", cmd_whatchanged, RUN_SETUP },
+	{ "worktree", cmd_worktree, RUN_SETUP },
 	{ "write-tree", cmd_write_tree, RUN_SETUP },
 };
 
diff --git a/t/t2026-prune-linked-checkouts.sh b/t/t2026-prune-linked-checkouts.sh
index 1821a480c5..e872f02dac 100755
--- a/t/t2026-prune-linked-checkouts.sh
+++ b/t/t2026-prune-linked-checkouts.sh
@@ -8,15 +8,15 @@ test_expect_success initialize '
 	git commit --allow-empty -m init
 '
 
-test_expect_success 'prune --worktrees on normal repo' '
-	git prune --worktrees &&
-	test_must_fail git prune --worktrees abc
+test_expect_success 'worktree prune on normal repo' '
+	git worktree prune &&
+	test_must_fail git worktree prune abc
 '
 
 test_expect_success 'prune files inside $GIT_DIR/worktrees' '
 	mkdir .git/worktrees &&
 	: >.git/worktrees/abc &&
-	git prune --worktrees --verbose >actual &&
+	git worktree prune --verbose >actual &&
 	cat >expect <<EOF &&
 Removing worktrees/abc: not a valid directory
 EOF
@@ -31,7 +31,7 @@ test_expect_success 'prune directories without gitdir' '
 	cat >expect <<EOF &&
 Removing worktrees/def: gitdir file does not exist
 EOF
-	git prune --worktrees --verbose >actual &&
+	git worktree prune --verbose >actual &&
 	test_i18ncmp expect actual &&
 	! test -d .git/worktrees/def &&
 	! test -d .git/worktrees
@@ -42,7 +42,7 @@ test_expect_success SANITY 'prune directories with unreadable gitdir' '
 	: >.git/worktrees/def/def &&
 	: >.git/worktrees/def/gitdir &&
 	chmod u-r .git/worktrees/def/gitdir &&
-	git prune --worktrees --verbose >actual &&
+	git worktree prune --verbose >actual &&
 	test_i18ngrep "Removing worktrees/def: unable to read gitdir file" actual &&
 	! test -d .git/worktrees/def &&
 	! test -d .git/worktrees
@@ -52,7 +52,7 @@ test_expect_success 'prune directories with invalid gitdir' '
 	mkdir -p .git/worktrees/def/abc &&
 	: >.git/worktrees/def/def &&
 	: >.git/worktrees/def/gitdir &&
-	git prune --worktrees --verbose >actual &&
+	git worktree prune --verbose >actual &&
 	test_i18ngrep "Removing worktrees/def: invalid gitdir file" actual &&
 	! test -d .git/worktrees/def &&
 	! test -d .git/worktrees
@@ -62,7 +62,7 @@ test_expect_success 'prune directories with gitdir pointing to nowhere' '
 	mkdir -p .git/worktrees/def/abc &&
 	: >.git/worktrees/def/def &&
 	echo "$(pwd)"/nowhere >.git/worktrees/def/gitdir &&
-	git prune --worktrees --verbose >actual &&
+	git worktree prune --verbose >actual &&
 	test_i18ngrep "Removing worktrees/def: gitdir file points to non-existent location" actual &&
 	! test -d .git/worktrees/def &&
 	! test -d .git/worktrees
@@ -72,7 +72,7 @@ test_expect_success 'not prune locked checkout' '
 	test_when_finished rm -r .git/worktrees &&
 	mkdir -p .git/worktrees/ghi &&
 	: >.git/worktrees/ghi/locked &&
-	git prune --worktrees &&
+	git worktree prune &&
 	test -d .git/worktrees/ghi
 '
 
@@ -82,14 +82,14 @@ test_expect_success 'not prune recent checkouts' '
 	mkdir -p .git/worktrees/jlm &&
 	echo "$(pwd)"/zz >.git/worktrees/jlm/gitdir &&
 	rmdir zz &&
-	git prune --worktrees --verbose --expire=2.days.ago &&
+	git worktree prune --verbose --expire=2.days.ago &&
 	test -d .git/worktrees/jlm
 '
 
 test_expect_success 'not prune proper checkouts' '
 	test_when_finished rm -r .git/worktrees &&
 	git checkout "--to=$PWD/nop" --detach master &&
-	git prune --worktrees &&
+	git worktree prune &&
 	test -d .git/worktrees/nop
 '