[PATCH 24/31] reference-transaction: use hook.h to run hooks

[Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>]

From: Emily Shaffer <emilyshaffer@xxxxxxxxxx>

By using the hook.h library, we get closer to removing the hook code
in run-command.c.

Signed-off-by: Emily Shaffer <emilyshaffer@xxxxxxxxxx>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 refs.c | 42 +++++++++++++++---------------------------
 1 file changed, 15 insertions(+), 27 deletions(-)

diff --git a/refs.c b/refs.c
index 59be29cf081..1149e7e7dcb 100644
--- a/refs.c
+++ b/refs.c
@@ -2062,47 +2062,35 @@ int ref_update_reject_duplicates(struct string_list *refnames,
 static int run_transaction_hook(struct ref_transaction *transaction,
 				const char *state)
 {
-	struct child_process proc = CHILD_PROCESS_INIT;
 	struct strbuf buf = STRBUF_INIT;
-	const char *hook;
+	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT;
+	struct string_list to_stdin = STRING_LIST_INIT_DUP;
 	int ret = 0, i;
+	char o[GIT_MAX_HEXSZ + 1], n[GIT_MAX_HEXSZ + 1];
 
-	hook = find_hook("reference-transaction");
-	if (!hook)
+	if (!hook_exists("reference-transaction"))
 		return ret;
 
-	strvec_pushl(&proc.args, hook, state, NULL);
-	proc.in = -1;
-	proc.stdout_to_stderr = 1;
-	proc.trace2_hook_name = "reference-transaction";
-
-	ret = start_command(&proc);
-	if (ret)
-		return ret;
-
-	sigchain_push(SIGPIPE, SIG_IGN);
+	strvec_push(&opt.args, state);
 
 	for (i = 0; i < transaction->nr; i++) {
 		struct ref_update *update = transaction->updates[i];
+		oid_to_hex_r(o, &update->old_oid);
+		oid_to_hex_r(n, &update->new_oid);
 
 		strbuf_reset(&buf);
-		strbuf_addf(&buf, "%s %s %s\n",
-			    oid_to_hex(&update->old_oid),
-			    oid_to_hex(&update->new_oid),
-			    update->refname);
-
-		if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
-			if (errno != EPIPE)
-				ret = -1;
-			break;
-		}
+		strbuf_addf(&buf, "%s %s %s", o, n, update->refname);
+		string_list_append(&to_stdin, buf.buf);
 	}
 
-	close(proc.in);
-	sigchain_pop(SIGPIPE);
+	opt.feed_pipe = pipe_from_string_list;
+	opt.feed_pipe_ctx = &to_stdin;
+
+	ret = run_hooks("reference-transaction", &opt);
+	run_hooks_opt_clear(&opt);
 	strbuf_release(&buf);
+	string_list_clear(&to_stdin, 0);
 
-	ret |= finish_command(&proc);
 	return ret;
 }
 
-- 
2.32.0.rc1.458.gd885d4f985c