From: Han-Wen Nienhuys <hanwen@xxxxxxxxxx>
This introduces the REF_SKIP_OID_VERIFICATION flag, which lets the ref-store
test helper write non-existent or unparsable objects into the ref storage.
Use this to make t1006 and t3800 independent of the files storage backend.
Signed-off-by: Han-Wen Nienhuys <hanwen@xxxxxxxxxx>
---
refs.h | 8 ++++++-
refs/files-backend.c | 50 +++++++++++++++++++++++++-------------------
t/t1006-cat-file.sh | 5 ++---
t/t3800-mktag.sh | 6 ++++--
4 files changed, 42 insertions(+), 27 deletions(-)
diff --git a/refs.h b/refs.h
index d5099d4984e..46e68fd4c2a 100644
--- a/refs.h
+++ b/refs.h
@@ -611,12 +611,18 @@ struct ref_transaction *ref_transaction_begin(struct strbuf *err);
*/
#define REF_FORCE_CREATE_REFLOG (1 << 1)
+/*
+ * Blindly write an object_id. This is useful for testing data corruption
+ * scenarios.
+ */
+#define REF_SKIP_OID_VERIFICATION (1 << 10)
+
/*
* Bitmask of all of the flags that are allowed to be passed in to
* ref_transaction_update() and friends:
*/
#define REF_TRANSACTION_UPDATE_ALLOWED_FLAGS \
- (REF_NO_DEREF | REF_FORCE_CREATE_REFLOG)
+ (REF_NO_DEREF | REF_FORCE_CREATE_REFLOG | REF_SKIP_OID_VERIFICATION)
/*
* Add a reference update to transaction. `new_oid` is the value that
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 5cfdec1e820..28a349b24ad 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -1351,7 +1351,8 @@ static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname)
}
static int write_ref_to_lockfile(struct ref_lock *lock,
- const struct object_id *oid, struct strbuf *err);
+ const struct object_id *oid,
+ int skip_oid_verification, struct strbuf *err);
static int commit_ref_update(struct files_ref_store *refs,
struct ref_lock *lock,
const struct object_id *oid, const char *logmsg,
@@ -1468,7 +1469,7 @@ static int files_copy_or_rename_ref(struct ref_store *ref_store,
}
oidcpy(&lock->old_oid, &orig_oid);
- if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
+ if (write_ref_to_lockfile(lock, &orig_oid, 0, &err) ||
commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) {
error("unable to write current sha1 into %s: %s", newrefname, err.buf);
strbuf_release(&err);
@@ -1488,7 +1489,7 @@ static int files_copy_or_rename_ref(struct ref_store *ref_store,
flag = log_all_ref_updates;
log_all_ref_updates = LOG_REFS_NONE;
- if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
+ if (write_ref_to_lockfile(lock, &orig_oid, 0, &err) ||
commit_ref_update(refs, lock, &orig_oid, NULL, &err)) {
error("unable to write current sha1 into %s: %s", oldrefname, err.buf);
strbuf_release(&err);
@@ -1724,26 +1725,31 @@ static int files_log_ref_write(struct files_ref_store *refs,
* errors, rollback the lockfile, fill in *err and return -1.
*/
static int write_ref_to_lockfile(struct ref_lock *lock,
- const struct object_id *oid, struct strbuf *err)
+ const struct object_id *oid,
+ int skip_oid_verification, struct strbuf *err)
{
static char term = '\n';
struct object *o;
int fd;
- o = parse_object(the_repository, oid);
- if (!o) {
- strbuf_addf(err,
- "trying to write ref '%s' with nonexistent object %s",
- lock->ref_name, oid_to_hex(oid));
- unlock_ref(lock);
- return -1;
- }
- if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
- strbuf_addf(err,
- "trying to write non-commit object %s to branch '%s'",
- oid_to_hex(oid), lock->ref_name);
- unlock_ref(lock);
- return -1;
+ if (!skip_oid_verification) {
+ o = parse_object(the_repository, oid);
+ if (!o) {
+ strbuf_addf(
+ err,
+ "trying to write ref '%s' with nonexistent object %s",
+ lock->ref_name, oid_to_hex(oid));
+ unlock_ref(lock);
+ return -1;
+ }
+ if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
+ strbuf_addf(
+ err,
+ "trying to write non-commit object %s to branch '%s'",
+ oid_to_hex(oid), lock->ref_name);
+ unlock_ref(lock);
+ return -1;
+ }
}
fd = get_lock_file_fd(&lock->lk);
if (write_in_full(fd, oid_to_hex(oid), the_hash_algo->hexsz) < 0 ||
@@ -2150,7 +2156,7 @@ static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator)
}
static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator,
- struct object_id *peeled)
+ struct object_id *peeled)
{
BUG("ref_iterator_peel() called for reflog_iterator");
}
@@ -2534,8 +2540,10 @@ static int lock_ref_for_update(struct files_ref_store *refs,
* The reference already has the desired
* value, so we don't need to write it.
*/
- } else if (write_ref_to_lockfile(lock, &update->new_oid,
- err)) {
+ } else if (write_ref_to_lockfile(
+ lock, &update->new_oid,
+ update->flags & REF_SKIP_OID_VERIFICATION,
+ err)) {
char *write_err = strbuf_detach(err, NULL);
/*
diff --git a/t/t1006-cat-file.sh b/t/t1006-cat-file.sh
index 658628375c8..f5333196b07 100755
--- a/t/t1006-cat-file.sh
+++ b/t/t1006-cat-file.sh
@@ -452,9 +452,8 @@ test_expect_success 'the --allow-unknown-type option does not consider replaceme
# Create it manually, as "git replace" will die on bogus
# types.
head=$(git rev-parse --verify HEAD) &&
- test_when_finished "rm -rf .git/refs/replace" &&
- mkdir -p .git/refs/replace &&
- echo $head >.git/refs/replace/$bogus_short_sha1 &&
+ test_when_finished "test-tool ref-store main delete-refs 0 msg refs/replace/$bogus_short_sha1" &&
+ test-tool ref-store main update-ref msg "refs/replace/$bogus_short_sha1" $head $ZERO_OID 1024 &&
cat >expect <<-EOF &&
commit
diff --git a/t/t3800-mktag.sh b/t/t3800-mktag.sh
index 0544d58a6ea..128d374f740 100755
--- a/t/t3800-mktag.sh
+++ b/t/t3800-mktag.sh
@@ -72,7 +72,8 @@ check_verify_failure () {
# Manually create the broken, we cannot do it with
# update-ref
- echo "$bad_tag" >"bad-tag/$tag_ref" &&
+ test-tool -C bad-tag ref-store main delete-refs 0 msg "$tag_ref" &&
+ test-tool -C bad-tag ref-store main update-ref msg "$tag_ref" $bad_tag $ZERO_OID 1024 &&
# Unlike fsck-ing unreachable content above, this
# will always fail.
@@ -83,7 +84,8 @@ check_verify_failure () {
# Make sure the earlier test created it for us
git rev-parse "$bad_tag" &&
- echo "$bad_tag" >"bad-tag/$tag_ref" &&
+ test-tool -C bad-tag ref-store main delete-refs 0 msg "$tag_ref" &&
+ test-tool -C bad-tag ref-store main update-ref msg "$tag_ref" $bad_tag $ZERO_OID 1024 &&
printf "%s tag\t%s\n" "$bad_tag" "$tag_ref" >expected &&
git -C bad-tag for-each-ref "$tag_ref" >actual &&
--
gitgitgadget
