transport-helper: fix sync issue on crashes
When a remote helper crashes while pushing we should revert back to the
state before the push, however, it's possible that `git fast-export`
already finished its job, and therefore has exported the marks already.
This creates a synchronization problem because from that moment on
`git fast-{import,export}` will have marks that the remote helper is not
aware of and all further commands fail (if those marks are referenced).
The fix is to tell `git fast-export` to export to a temporary file, and
only after the remote helper has finishes successfully, move to the
final destination.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t5801-remote-helpers.sh b/t/t5801-remote-helpers.sh
index 25fd2e7..aa3e223 100755
--- a/t/t5801-remote-helpers.sh
+++ b/t/t5801-remote-helpers.sh
@@ -220,6 +220,20 @@
)
'
+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 &&
@@ -232,7 +246,11 @@
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 c890db6..b468e4f 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -435,7 +435,7 @@
fastexport->argv[argc++] = data->signed_tags ?
"--signed-tags=verbatim" : "--signed-tags=warn-strip";
if (data->export_marks) {
- strbuf_addf(&tmp, "--export-marks=%s", data->export_marks);
+ strbuf_addf(&tmp, "--export-marks=%s.tmp", data->export_marks);
fastexport->argv[argc++] = strbuf_detach(&tmp, NULL);
}
if (data->import_marks) {
@@ -911,7 +911,16 @@
if (finish_command(&exporter))
die("Error while running fast-export");
- return 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;
}
static int push_refs(struct transport *transport,
