[PATCH v9 29/37] receive-pack: convert 'update' hook to hook.h

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By using hook.h to invoke the 'update' hook, now hooks can be specified
in the config in addition to the hookdir.

Signed-off-by: Emily Shaffer <emilyshaffer@xxxxxxxxxx>
---
 Documentation/githooks.txt       |  3 ++
 builtin/receive-pack.c           | 65 ++++++++++++++++++++++----------
 t/t1416-ref-transaction-hooks.sh |  4 +-
 3 files changed, 50 insertions(+), 22 deletions(-)

diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index edb840dcdd..1d731474ac 100644
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt
@@ -368,6 +368,9 @@ The default 'update' hook, when enabled--and with
 `hooks.allowunannotated` config option unset or set to false--prevents
 unannotated tags to be pushed.
 
+Hooks executed during 'update' are run in parallel, unless hook.jobs is
+configured to 1.
+
 [[proc-receive]]
 proc-receive
 ~~~~~~~~~~~~
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 09e7cdee45..0f6bc8653f 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -938,33 +938,58 @@ static int run_receive_hook(struct command *commands,
 	return status;
 }
 
+static void hook_output_to_sideband(struct strbuf *output, void *cb_data)
+{
+	int keepalive_active = 0;
+
+	if (keepalive_in_sec <= 0)
+		use_keepalive = KEEPALIVE_NEVER;
+	if (use_keepalive == KEEPALIVE_ALWAYS)
+		keepalive_active = 1;
+
+	/* send a keepalive if there is no data to write */
+	if (keepalive_active && !output->len) {
+		static const char buf[] = "0005\1";
+		write_or_die(1, buf, sizeof(buf) - 1);
+		return;
+	}
+
+	if (use_keepalive == KEEPALIVE_AFTER_NUL && !keepalive_active) {
+		const char *first_null = memchr(output->buf, '\0', output->len);
+		if (first_null) {
+			/* The null bit is excluded. */
+			size_t before_null = first_null - output->buf;
+			size_t after_null = output->len - (before_null + 1);
+			keepalive_active = 1;
+			send_sideband(1, 2, output->buf, before_null, use_sideband);
+			send_sideband(1, 2, first_null + 1, after_null, use_sideband);
+
+			return;
+		}
+	}
+
+	send_sideband(1, 2, output->buf, output->len, use_sideband);
+}
+
 static int run_update_hook(struct command *cmd)
 {
-	const char *argv[5];
-	struct child_process proc = CHILD_PROCESS_INIT;
+	struct run_hooks_opt opt;
 	int code;
 
-	argv[0] = find_hook("update");
-	if (!argv[0])
-		return 0;
+	run_hooks_opt_init_async(&opt);
 
-	argv[1] = cmd->ref_name;
-	argv[2] = oid_to_hex(&cmd->old_oid);
-	argv[3] = oid_to_hex(&cmd->new_oid);
-	argv[4] = NULL;
+	strvec_pushl(&opt.args,
+		     cmd->ref_name,
+		     oid_to_hex(&cmd->old_oid),
+		     oid_to_hex(&cmd->new_oid),
+		     NULL);
 
-	proc.no_stdin = 1;
-	proc.stdout_to_stderr = 1;
-	proc.err = use_sideband ? -1 : 0;
-	proc.argv = argv;
-	proc.trace2_hook_name = "update";
-
-	code = start_command(&proc);
-	if (code)
-		return code;
 	if (use_sideband)
-		copy_to_sideband(proc.err, -1, NULL);
-	return finish_command(&proc);
+		opt.consume_sideband = hook_output_to_sideband;
+
+	code = run_hooks("update", &opt);
+	run_hooks_opt_clear(&opt);
+	return code;
 }
 
 static struct command *find_command_by_refname(struct command *list,
diff --git a/t/t1416-ref-transaction-hooks.sh b/t/t1416-ref-transaction-hooks.sh
index 3a90a59143..0a3c3e4a86 100755
--- a/t/t1416-ref-transaction-hooks.sh
+++ b/t/t1416-ref-transaction-hooks.sh
@@ -124,10 +124,10 @@ test_expect_success 'interleaving hook calls succeed' '
 	EOF
 
 	cat >expect <<-EOF &&
-		hooks/update refs/tags/PRE $ZERO_OID $PRE_OID
+		$(pwd)/target-repo.git/hooks/update refs/tags/PRE $ZERO_OID $PRE_OID
 		$(pwd)/target-repo.git/hooks/reference-transaction prepared
 		$(pwd)/target-repo.git/hooks/reference-transaction committed
-		hooks/update refs/tags/POST $ZERO_OID $POST_OID
+		$(pwd)/target-repo.git/hooks/update refs/tags/POST $ZERO_OID $POST_OID
 		$(pwd)/target-repo.git/hooks/reference-transaction prepared
 		$(pwd)/target-repo.git/hooks/reference-transaction committed
 	EOF
-- 
2.31.1.818.g46aad6cb9e-goog




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