[PATCH 05/13] hooks: convert 'post-checkout' hook to hook library

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

From: Emily Shaffer <emilyshaffer@google.com>

Move the running of the 'post-checkout' hook away from run-command.h
to the new hook.h library. For "worktree" this requires a change to it
to run the hooks from a given directory.

We could strictly speaking skip the "absolute_path" flag and just
check if "dir" is specified, but let's split them up for clarity, as
well as for any future user who'd like to set "dir" but not implicitly
change the argument to an absolute path.

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 builtin/checkout.c | 14 +++++++++-----
 builtin/clone.c    |  7 +++++--
 builtin/worktree.c | 28 ++++++++++++----------------
 hook.c             |  9 +++++++++
 hook.h             |  9 +++++++++
 read-cache.c       |  1 +
 reset.c            | 14 ++++++++++----
 7 files changed, 55 insertions(+), 27 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 8c69dcdf72a..555119cc322 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -9,6 +9,7 @@
 #include "config.h"
 #include "diff.h"
 #include "dir.h"
+#include "hook.h"
 #include "ll-merge.h"
 #include "lockfile.h"
 #include "merge-recursive.h"
@@ -106,13 +107,16 @@ struct branch_info {
 static int post_checkout_hook(struct commit *old_commit, struct commit *new_commit,
 			      int changed)
 {
-	return run_hook_le(NULL, "post-checkout",
-			   oid_to_hex(old_commit ? &old_commit->object.oid : null_oid()),
-			   oid_to_hex(new_commit ? &new_commit->object.oid : null_oid()),
-			   changed ? "1" : "0", NULL);
+	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT;
+
 	/* "new_commit" can be NULL when checking out from the index before
 	   a commit exists. */
-
+	strvec_pushl(&opt.args,
+		     oid_to_hex(old_commit ? &old_commit->object.oid : null_oid()),
+		     oid_to_hex(new_commit ? &new_commit->object.oid : null_oid()),
+		     changed ? "1" : "0",
+		     NULL);
+	return run_hooks_oneshot("post-checkout", &opt);
 }
 
 static int update_some(const struct object_id *oid, struct strbuf *base,
diff --git a/builtin/clone.c b/builtin/clone.c
index c9d4ca26640..4b356770739 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -32,6 +32,7 @@
 #include "connected.h"
 #include "packfile.h"
 #include "list-objects-filter-options.h"
+#include "hook.h"
 
 /*
  * Overall FIXMEs:
@@ -659,6 +660,7 @@ static int checkout(int submodule_progress)
 	struct tree *tree;
 	struct tree_desc t;
 	int err = 0;
+	struct run_hooks_opt hook_opt = RUN_HOOKS_OPT_INIT;
 
 	if (option_no_checkout)
 		return 0;
@@ -704,8 +706,9 @@ static int checkout(int submodule_progress)
 	if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 		die(_("unable to write new index file"));
 
-	err |= run_hook_le(NULL, "post-checkout", oid_to_hex(null_oid()),
-			   oid_to_hex(&oid), "1", NULL);
+	strvec_pushl(&hook_opt.args, oid_to_hex(null_oid()), oid_to_hex(&oid),
+		     "1", NULL);
+	err |= run_hooks_oneshot("post-checkout", &hook_opt);
 
 	if (!err && (option_recurse_submodules.nr > 0)) {
 		struct strvec args = STRVEC_INIT;
diff --git a/builtin/worktree.c b/builtin/worktree.c
index d22ece93e1a..330867c19bf 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -382,22 +382,18 @@ static int add_worktree(const char *path, const char *refname,
 	 * is_junk is cleared, but do return appropriate code when hook fails.
 	 */
 	if (!ret && opts->checkout) {
-		const char *hook = find_hook("post-checkout");
-		if (hook) {
-			const char *env[] = { "GIT_DIR", "GIT_WORK_TREE", NULL };
-			cp.git_cmd = 0;
-			cp.no_stdin = 1;
-			cp.stdout_to_stderr = 1;
-			cp.dir = path;
-			cp.env = env;
-			cp.argv = NULL;
-			cp.trace2_hook_name = "post-checkout";
-			strvec_pushl(&cp.args, absolute_path(hook),
-				     oid_to_hex(null_oid()),
-				     oid_to_hex(&commit->object.oid),
-				     "1", NULL);
-			ret = run_command(&cp);
-		}
+		struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT;
+
+		strvec_pushl(&opt.env, "GIT_DIR", "GIT_WORK_TREE", NULL);
+		strvec_pushl(&opt.args,
+			     oid_to_hex(null_oid()),
+			     oid_to_hex(&commit->object.oid),
+			     "1",
+			     NULL);
+		opt.dir = path;
+		opt.absolute_path = 1;
+
+		ret = run_hooks_oneshot("post-checkout", &opt);
 	}
 
 	strvec_clear(&child_env);
diff --git a/hook.c b/hook.c
index bfdc79e2f1a..186c249bbec 100644
--- a/hook.c
+++ b/hook.c
@@ -63,6 +63,7 @@ static int pick_next_hook(struct child_process *cp,
 	cp->env = hook_cb->options->env.v;
 	cp->stdout_to_stderr = 1;
 	cp->trace2_hook_name = hook_cb->hook_name;
+	cp->dir = hook_cb->options->dir;
 
 	/* add command */
 	strvec_push(&cp->args, run_me->hook_path);
@@ -116,6 +117,7 @@ static int notify_hook_finished(int result,
 int run_hooks(const char *hook_name, const char *hook_path,
 	      struct run_hooks_opt *options)
 {
+	struct strbuf abs_path = STRBUF_INIT;
 	struct hook my_hook = {
 		.hook_path = hook_path,
 	};
@@ -129,6 +131,10 @@ int run_hooks(const char *hook_name, const char *hook_path,
 	if (!options)
 		BUG("a struct run_hooks_opt must be provided to run_hooks");
 
+	if (options->absolute_path) {
+		strbuf_add_absolute_path(&abs_path, hook_path);
+		my_hook.hook_path = abs_path.buf;
+	}
 	cb_data.run_me = &my_hook;
 
 	run_processes_parallel_tr2(jobs,
@@ -139,6 +145,9 @@ int run_hooks(const char *hook_name, const char *hook_path,
 				   "hook",
 				   hook_name);
 
+	if (options->absolute_path)
+		strbuf_release(&abs_path);
+
 	return cb_data.rc;
 }
 
diff --git a/hook.h b/hook.h
index a2b8d4fc6bd..7a858a6beed 100644
--- a/hook.h
+++ b/hook.h
@@ -14,6 +14,15 @@ struct run_hooks_opt
 
 	/* Args to be passed to each hook */
 	struct strvec args;
+
+	/*
+	 * Resolve and run the "absolute_path(hook)" instead of
+	 * "hook". Used for "git worktree" hooks
+	 */
+	int absolute_path;
+
+	/* Path to initial working directory for subprocess */
+	const char *dir;
 };
 
 #define RUN_HOOKS_OPT_INIT { \
diff --git a/read-cache.c b/read-cache.c
index a78b88a41bf..9773118d078 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -28,6 +28,7 @@
 #include "sparse-index.h"
 #include "csum-file.h"
 #include "promisor-remote.h"
+#include "hook.h"
 
 /* Mask for the name length in ce_flags in the on-disk index */
 
diff --git a/reset.c b/reset.c
index 79310ae071b..1237ced8a58 100644
--- a/reset.c
+++ b/reset.c
@@ -7,6 +7,7 @@
 #include "tree-walk.h"
 #include "tree.h"
 #include "unpack-trees.h"
+#include "hook.h"
 
 int reset_head(struct repository *r, struct object_id *oid, const char *action,
 	       const char *switch_to_branch, unsigned flags,
@@ -125,10 +126,15 @@ int reset_head(struct repository *r, struct object_id *oid, const char *action,
 			ret = create_symref("HEAD", switch_to_branch,
 					    reflog_head);
 	}
-	if (run_hook)
-		run_hook_le(NULL, "post-checkout",
-			    oid_to_hex(orig ? orig : null_oid()),
-			    oid_to_hex(oid), "1", NULL);
+	if (run_hook) {
+		struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT;
+		strvec_pushl(&opt.args,
+			     oid_to_hex(orig ? orig : null_oid()),
+			     oid_to_hex(oid),
+			     "1",
+			     NULL);
+		run_hooks_oneshot("post-checkout", &opt);
+	}
 
 leave_reset_head:
 	strbuf_release(&msg);
-- 
2.33.0.1567.g7b23ce7ed9e