[PATCH v2 3/3] worktree: teach `add` to accept --reason <string> with --lock

["Stephen Manz via GitGitGadget" <gitgitgadget@gmail.com>]

From: Stephen Manz <smanz@alum.mit.edu>

The default reason stored in the lock file, "added with --lock",
is unlikely to be what the user would have given in a separate
`git worktree lock` command. Allowing `--reason` to be specified
along with `--lock` when adding a working tree gives the user control
over the reason for locking without needing a second command.

Signed-off-by: Stephen Manz <smanz@alum.mit.edu>
---
 Documentation/git-worktree.txt |  4 ++--
 builtin/worktree.c             |  7 +++++++
 t/t2400-worktree-add.sh        | 13 +++++++++++++
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index f1bb1fa5f5a..720663746ba 100644
--- a/Documentation/git-worktree.txt
+++ b/Documentation/git-worktree.txt
@@ -9,7 +9,7 @@ git-worktree - Manage multiple working trees
 SYNOPSIS
 --------
 [verse]
-'git worktree add' [-f] [--detach] [--checkout] [--lock] [-b <new-branch>] <path> [<commit-ish>]
+'git worktree add' [-f] [--detach] [--checkout] [--lock [--reason <string>]] [-b <new-branch>] <path> [<commit-ish>]
 'git worktree list' [--porcelain]
 'git worktree lock' [--reason <string>] <worktree>
 'git worktree move' <worktree> <new-path>
@@ -242,7 +242,7 @@ With `list`, annotate missing working trees as prunable if they are
 older than `<time>`.
 
 --reason <string>::
-	With `lock`, an explanation why the working tree is locked.
+	With `lock` or with `add --lock`, an explanation why the working tree is locked.
 
 <worktree>::
 	Working trees can be identified by path, either relative or
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 448ec69e745..074169508d0 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -31,6 +31,7 @@ struct add_opts {
 	int quiet;
 	int checkout;
 	int keep_locked;
+	const char *lock_reason;
 };
 
 static int show_only;
@@ -304,6 +305,8 @@ static int add_worktree(const char *path, const char *refname,
 	strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 	if (!opts->keep_locked)
 		write_file(sb.buf, "initializing");
+	else if (opts->lock_reason)
+		write_file(sb.buf, "%s", opts->lock_reason);
 	else
 		write_file(sb.buf, _("added with --lock"));
 
@@ -486,6 +489,8 @@ static int add(int ac, const char **av, const char *prefix)
 		OPT_BOOL('d', "detach", &opts.detach, N_("detach HEAD at named commit")),
 		OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
 		OPT_BOOL(0, "lock", &opts.keep_locked, N_("keep the new working tree locked")),
+		OPT_STRING(0, "reason", &opts.lock_reason, N_("string"),
+			   N_("reason for locking")),
 		OPT__QUIET(&opts.quiet, N_("suppress progress reporting")),
 		OPT_PASSTHRU(0, "track", &opt_track, NULL,
 			     N_("set up tracking mode (see git-branch(1))"),
@@ -500,6 +505,8 @@ static int add(int ac, const char **av, const char *prefix)
 	ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 	if (!!opts.detach + !!new_branch + !!new_branch_force > 1)
 		die(_("-b, -B, and --detach are mutually exclusive"));
+	if (opts.lock_reason && !opts.keep_locked)
+		die(_("--reason requires --lock"));
 	if (ac < 1 || ac > 2)
 		usage_with_options(worktree_usage, options);
 
diff --git a/t/t2400-worktree-add.sh b/t/t2400-worktree-add.sh
index 874a61dbfa7..de904448e59 100755
--- a/t/t2400-worktree-add.sh
+++ b/t/t2400-worktree-add.sh
@@ -71,6 +71,19 @@ test_expect_success '"add" worktree with lock' '
 	test -f .git/worktrees/here-with-lock/locked
 '
 
+test_expect_success '"add" worktree with lock and reason' '
+	git worktree add --detach --lock --reason "why not" here-with-lock-reason main &&
+	test_when_finished "git worktree unlock here-with-lock-reason || :" &&
+	test -f .git/worktrees/here-with-lock-reason/locked &&
+	echo why not >expect &&
+	test_cmp expect .git/worktrees/here-with-lock-reason/locked
+'
+
+test_expect_success '"add" worktree with reason but no lock' '
+	test_must_fail git worktree add --detach --reason "why not" here-with-reason-only main &&
+	test_path_is_missing .git/worktrees/here-with-reason-only/locked
+'
+
 test_expect_success '"add" worktree from a subdir' '
 	(
 		mkdir sub &&
-- 
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