[PATCH v2 07/13] git hook run: add an --ignore-missing flag

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For certain one-shot hooks we'd like to optimistically run them, and
not complain if they don't exist. This will be used by send-email in a
subsequent commit.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 Documentation/git-hook.txt | 10 +++++++++-
 builtin/hook.c             |  7 ++++++-
 t/t1800-hook.sh            |  5 +++++
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-hook.txt b/Documentation/git-hook.txt
index e39b1b5d069..77c3a8ad909 100644
--- a/Documentation/git-hook.txt
+++ b/Documentation/git-hook.txt
@@ -8,7 +8,7 @@ git-hook - Run git hooks
 SYNOPSIS
 --------
 [verse]
-'git hook' run <hook-name> [-- <hook-args>]
+'git hook' run [--ignore-missing] <hook-name> [-- <hook-args>]
 
 DESCRIPTION
 -----------
@@ -28,6 +28,14 @@ Any positional arguments to the hook should be passed after a
 mandatory `--` (or `--end-of-options`, see linkgit:gitcli[7]). See
 linkgit:githooks[5] for arguments hooks might expect (if any).
 
+OPTIONS
+-------
+
+--ignore-missing::
+	Ignore any missing hook by quietly returning zero. Used for
+	tools that want to do a blind one-shot run of a hook that may
+	or may not be present.
+
 SEE ALSO
 --------
 linkgit:githooks[5]
diff --git a/builtin/hook.c b/builtin/hook.c
index 41dd15550cf..fa26454990d 100644
--- a/builtin/hook.c
+++ b/builtin/hook.c
@@ -7,7 +7,7 @@
 #include "strvec.h"
 
 #define BUILTIN_HOOK_RUN_USAGE \
-	N_("git hook run <hook-name> [-- <hook-args>]")
+	N_("git hook run [--ignore-missing] <hook-name> [-- <hook-args>]")
 
 static const char * const builtin_hook_usage[] = {
 	BUILTIN_HOOK_RUN_USAGE,
@@ -23,9 +23,12 @@ static int run(int argc, const char **argv, const char *prefix)
 {
 	int i;
 	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT;
+	int ignore_missing = 0;
 	const char *hook_name;
 	const char *hook_path;
 	struct option run_options[] = {
+		OPT_BOOL(0, "ignore-missing", &ignore_missing,
+			 N_("silently ignore missing requested <hook-name>")),
 		OPT_END(),
 	};
 	int ret;
@@ -53,6 +56,8 @@ static int run(int argc, const char **argv, const char *prefix)
 	git_config(git_default_config, NULL);
 
 	hook_name = argv[0];
+	if (ignore_missing)
+		return run_hooks_oneshot(hook_name, &opt);
 	hook_path = find_hook(hook_name);
 	if (!hook_path) {
 		error("cannot find a hook named %s", hook_name);
diff --git a/t/t1800-hook.sh b/t/t1800-hook.sh
index 3aea1b105f0..29718aa9913 100755
--- a/t/t1800-hook.sh
+++ b/t/t1800-hook.sh
@@ -21,6 +21,11 @@ test_expect_success 'git hook run: nonexistent hook' '
 	test_cmp stderr.expect stderr.actual
 '
 
+test_expect_success 'git hook run: nonexistent hook with --ignore-missing' '
+	git hook run --ignore-missing does-not-exist 2>stderr.actual &&
+	test_must_be_empty stderr.actual
+'
+
 test_expect_success 'git hook run: basic' '
 	write_script .git/hooks/test-hook <<-EOF &&
 	echo Test hook
-- 
2.33.1.1338.g20da966911a




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