Merge branch 'fc/transport-helper-sync-error-fix'

Make sure the marks are not written out when the transport helper
did not finish happily, to avoid leaving a marks file that is out of
sync with the reality.

* fc/transport-helper-sync-error-fix:
  t5801 (remote-helpers): cleanup environment sets
  transport-helper: fix sync issue on crashes
  transport-helper: trivial cleanup
  transport-helper: propagate recvline() error pushing
  remote-helpers: make recvline return an error
  transport-helper: remove barely used xchgline()

2 files changed, 67 insertions, 37 deletions

diff --git a/t/t5801-remote-helpers.sh b/t/t5801-remote-helpers.sh
index 25fd2e7f46..a00a660763 100755
--- a/t/t5801-remote-helpers.sh
+++ b/t/t5801-remote-helpers.sh
@@ -212,19 +212,30 @@ test_expect_success 'push update refs failure' '
 	echo "update fail" >>file &&
 	git commit -a -m "update fail" &&
 	git rev-parse --verify testgit/origin/heads/update >expect &&
-	GIT_REMOTE_TESTGIT_PUSH_ERROR="non-fast forward" &&
-	export GIT_REMOTE_TESTGIT_PUSH_ERROR &&
-	test_expect_code 1 git push origin update &&
+	test_expect_code 1 env GIT_REMOTE_TESTGIT_FAILURE="non-fast forward" \
+		git push origin update &&
 	git rev-parse --verify testgit/origin/heads/update >actual &&
 	test_cmp expect actual
 	)
 '
 
+clean_mark () {
+	cut -f 2 -d ' ' "$1" |
+	git cat-file --batch-check |
+	grep commit |
+	sort >$(basename "$1")
+}
+
+cmp_marks () {
+	test_when_finished "rm -rf git.marks testgit.marks" &&
+	clean_mark ".git/testgit/$1/git.marks" &&
+	clean_mark ".git/testgit/$1/testgit.marks" &&
+	test_cmp git.marks testgit.marks
+}
+
 test_expect_success 'proper failure checks for fetching' '
-	(GIT_REMOTE_TESTGIT_FAILURE=1 &&
-	export GIT_REMOTE_TESTGIT_FAILURE &&
-	cd local &&
-	test_must_fail git fetch 2> error &&
+	(cd local &&
+	test_must_fail env GIT_REMOTE_TESTGIT_FAILURE=1 git fetch 2>error &&
 	cat error &&
 	grep -q "Error while running fast-import" error
 	)
@@ -232,7 +243,11 @@ test_expect_success 'proper failure checks for fetching' '
 
 test_expect_success 'proper failure checks for pushing' '
 	(cd local &&
-	test_must_fail env GIT_REMOTE_TESTGIT_FAILURE=1 git push --all
+	git checkout -b crash master &&
+	echo crash >>file &&
+	git commit -a -m crash &&
+	test_must_fail env GIT_REMOTE_TESTGIT_FAILURE=1 git push --all &&
+	cmp_marks origin
 	)
 '
 
diff --git a/transport-helper.c b/transport-helper.c
index 86e1679c1e..b468e4f88e 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -58,7 +58,7 @@ static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name)
 	if (strbuf_getline(buffer, helper, '\n') == EOF) {
 		if (debug)
 			fprintf(stderr, "Debug: Remote helper quit.\n");
-		exit(128);
+		return 1;
 	}
 
 	if (debug)
@@ -71,12 +71,6 @@ static int recvline(struct helper_data *helper, struct strbuf *buffer)
 	return recvline_fh(helper->out, buffer, helper->name);
 }
 
-static void xchgline(struct helper_data *helper, struct strbuf *buffer)
-{
-	sendline(helper, buffer);
-	recvline(helper, buffer);
-}
-
 static void write_constant(int fd, const char *str)
 {
 	if (debug)
@@ -163,7 +157,8 @@ static struct child_process *get_helper(struct transport *transport)
 	while (1) {
 		const char *capname;
 		int mandatory = 0;
-		recvline(data, &buf);
+		if (recvline(data, &buf))
+			exit(128);
 
 		if (!*buf.buf)
 			break;
@@ -200,15 +195,9 @@ static struct child_process *get_helper(struct transport *transport)
 		} else if (!strcmp(capname, "signed-tags")) {
 			data->signed_tags = 1;
 		} else if (starts_with(capname, "export-marks ")) {
-			struct strbuf arg = STRBUF_INIT;
-			strbuf_addstr(&arg, "--export-marks=");
-			strbuf_addstr(&arg, capname + strlen("export-marks "));
-			data->export_marks = strbuf_detach(&arg, NULL);
+			data->export_marks = xstrdup(capname + strlen("export-marks "));
 		} else if (starts_with(capname, "import-marks")) {
-			struct strbuf arg = STRBUF_INIT;
-			strbuf_addstr(&arg, "--import-marks=");
-			strbuf_addstr(&arg, capname + strlen("import-marks "));
-			data->import_marks = strbuf_detach(&arg, NULL);
+			data->import_marks = xstrdup(capname + strlen("import-marks "));
 		} else if (starts_with(capname, "no-private-update")) {
 			data->no_private_update = 1;
 		} else if (mandatory) {
@@ -307,7 +296,9 @@ static int set_helper_option(struct transport *transport,
 		quote_c_style(value, &buf, NULL, 0);
 	strbuf_addch(&buf, '\n');
 
-	xchgline(data, &buf);
+	sendline(data, &buf);
+	if (recvline(data, &buf))
+		exit(128);
 
 	if (!strcmp(buf.buf, "ok"))
 		ret = 0;
@@ -379,7 +370,8 @@ static int fetch_with_fetch(struct transport *transport,
 	sendline(data, &buf);
 
 	while (1) {
-		recvline(data, &buf);
+		if (recvline(data, &buf))
+			exit(128);
 
 		if (starts_with(buf.buf, "lock ")) {
 			const char *name = buf.buf + 5;
@@ -430,6 +422,8 @@ static int get_exporter(struct transport *transport,
 	struct helper_data *data = transport->data;
 	struct child_process *helper = get_helper(transport);
 	int argc = 0, i;
+	struct strbuf tmp = STRBUF_INIT;
+
 	memset(fastexport, 0, sizeof(*fastexport));
 
 	/* we need to duplicate helper->in because we want to use it after
@@ -440,10 +434,14 @@ static int get_exporter(struct transport *transport,
 	fastexport->argv[argc++] = "--use-done-feature";
 	fastexport->argv[argc++] = data->signed_tags ?
 		"--signed-tags=verbatim" : "--signed-tags=warn-strip";
-	if (data->export_marks)
-		fastexport->argv[argc++] = data->export_marks;
-	if (data->import_marks)
-		fastexport->argv[argc++] = data->import_marks;
+	if (data->export_marks) {
+		strbuf_addf(&tmp, "--export-marks=%s.tmp", data->export_marks);
+		fastexport->argv[argc++] = strbuf_detach(&tmp, NULL);
+	}
+	if (data->import_marks) {
+		strbuf_addf(&tmp, "--import-marks=%s", data->import_marks);
+		fastexport->argv[argc++] = strbuf_detach(&tmp, NULL);
+	}
 
 	for (i = 0; i < revlist_args->nr; i++)
 		fastexport->argv[argc++] = revlist_args->items[i].string;
@@ -563,7 +561,9 @@ static int process_connect_service(struct transport *transport,
 		goto exit;
 
 	sendline(data, &cmdbuf);
-	recvline_fh(input, &cmdbuf, name);
+	if (recvline_fh(input, &cmdbuf, name))
+		exit(128);
+
 	if (!strcmp(cmdbuf.buf, "")) {
 		data->no_disconnect_req = 1;
 		if (debug)
@@ -739,16 +739,22 @@ static int push_update_ref_status(struct strbuf *buf,
 	return !(status == REF_STATUS_OK);
 }
 
-static void push_update_refs_status(struct helper_data *data,
+static int push_update_refs_status(struct helper_data *data,
 				    struct ref *remote_refs,
 				    int flags)
 {
 	struct strbuf buf = STRBUF_INIT;
 	struct ref *ref = remote_refs;
+	int ret = 0;
+
 	for (;;) {
 		char *private;
 
-		recvline(data, &buf);
+		if (recvline(data, &buf)) {
+			ret = 1;
+			break;
+		}
+
 		if (!buf.len)
 			break;
 
@@ -766,6 +772,7 @@ static void push_update_refs_status(struct helper_data *data,
 		free(private);
 	}
 	strbuf_release(&buf);
+	return ret;
 }
 
 static int push_refs_with_push(struct transport *transport,
@@ -846,8 +853,7 @@ static int push_refs_with_push(struct transport *transport,
 	sendline(data, &buf);
 	strbuf_release(&buf);
 
-	push_update_refs_status(data, remote_refs, flags);
-	return 0;
+	return push_update_refs_status(data, remote_refs, flags);
 }
 
 static int push_refs_with_export(struct transport *transport,
@@ -905,7 +911,15 @@ static int push_refs_with_export(struct transport *transport,
 
 	if (finish_command(&exporter))
 		die("Error while running fast-export");
-	push_update_refs_status(data, remote_refs, flags);
+	if (push_update_refs_status(data, remote_refs, flags))
+		return 1;
+
+	if (data->export_marks) {
+		strbuf_addf(&buf, "%s.tmp", data->export_marks);
+		rename(buf.buf, data->export_marks);
+		strbuf_release(&buf);
+	}
+
 	return 0;
 }
 
@@ -974,7 +988,8 @@ static struct ref *get_refs_list(struct transport *transport, int for_push)
 
 	while (1) {
 		char *eov, *eon;
-		recvline(data, &buf);
+		if (recvline(data, &buf))
+			exit(128);
 
 		if (!*buf.buf)
 			break;