[PATCH 1/2] run-command: teach 'run_hook' about alternate worktrees

[Eric Sunshine <sunshine@sunshineco.com>]

Git commands which run hooks do so at the top level of the worktree in
which the command itself was invoked. However, the 'git worktree'
command may need to run hooks within some other directory. For
instance, when "git worktree add" runs the 'post-checkout' hook, the
hook must be run within the newly-created worktree, not within the
worktree from which "git worktree add" was invoked.

To support this case, add 'run-hook' overloads which allow the
worktree directory to be specified.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
---
 run-command.c | 23 +++++++++++++++++++++--
 run-command.h |  4 ++++
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/run-command.c b/run-command.c
index 31fc5ea86e..0e3995bbf9 100644
--- a/run-command.c
+++ b/run-command.c
@@ -1197,7 +1197,8 @@ const char *find_hook(const char *name)
 	return path.buf;
 }
 
-int run_hook_ve(const char *const *env, const char *name, va_list args)
+int run_hook_cd_ve(const char *dir, const char *const *env, const char *name,
+		   va_list args)
 {
 	struct child_process hook = CHILD_PROCESS_INIT;
 	const char *p;
@@ -1206,9 +1207,10 @@ int run_hook_ve(const char *const *env, const char *name, va_list args)
 	if (!p)
 		return 0;
 
-	argv_array_push(&hook.args, p);
+	argv_array_push(&hook.args, absolute_path(p));
 	while ((p = va_arg(args, const char *)))
 		argv_array_push(&hook.args, p);
+	hook.dir = dir;
 	hook.env = env;
 	hook.no_stdin = 1;
 	hook.stdout_to_stderr = 1;
@@ -1216,6 +1218,23 @@ int run_hook_ve(const char *const *env, const char *name, va_list args)
 	return run_command(&hook);
 }
 
+int run_hook_ve(const char *const *env, const char *name, va_list args)
+{
+	return run_hook_cd_ve(NULL, env, name, args);
+}
+
+int run_hook_cd_le(const char *dir, const char *const *env, const char *name, ...)
+{
+	va_list args;
+	int ret;
+
+	va_start(args, name);
+	ret = run_hook_cd_ve(dir, env, name, args);
+	va_end(args);
+
+	return ret;
+}
+
 int run_hook_le(const char *const *env, const char *name, ...)
 {
 	va_list args;
diff --git a/run-command.h b/run-command.h
index 3932420ec8..8beddffea8 100644
--- a/run-command.h
+++ b/run-command.h
@@ -66,7 +66,11 @@ int run_command(struct child_process *);
 extern const char *find_hook(const char *name);
 LAST_ARG_MUST_BE_NULL
 extern int run_hook_le(const char *const *env, const char *name, ...);
+extern int run_hook_cd_le(const char *dir, const char *const *env,
+			  const char *name, ...);
 extern int run_hook_ve(const char *const *env, const char *name, va_list args);
+extern int run_hook_cd_ve(const char *dir, const char *const *env,
+			  const char *name, va_list args);
 
 #define RUN_COMMAND_NO_STDIN 1
 #define RUN_GIT_CMD	     2	/*If this is to be git sub-command */
-- 
2.16.1.291.g4437f3f132