[PATCH v5 1/7] refs: create and use `ref_update_expects_existing_old_ref()`
From: Karthik Nayak <hidden>
Date: 2024-06-07 13:33:09
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Karthik Nayak <redacted> The files and reftable backend, need to check if a ref must exist, so that the required validation can be done. A ref must exist only when the `old_oid` value of the update has been explicitly set and it is not the `null_oid` value. Since we also support symrefs now, we need to ensure that even when `old_target` is set a ref must exist. While this was missed when we added symref support in transactions, there are no active users of this path. As we introduce the 'symref-verify' command in the upcoming commits, it is important to fix this. So let's export this to a function called `ref_update_expects_existing_old_ref()` and expose it internally via 'refs-internal.h'. Helped-by: Patrick Steinhardt [off-list ref] Signed-off-by: Karthik Nayak <redacted> --- refs.c | 6 ++++++ refs/files-backend.c | 3 +-- refs/refs-internal.h | 6 ++++++ refs/reftable-backend.c | 2 +- 4 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/refs.c b/refs.c
index 8260c27cde..50d8d7d777 100644
--- a/refs.c
+++ b/refs.c@@ -2679,3 +2679,9 @@ int ref_update_check_old_target(const char *referent, struct ref_update *update, referent, update->old_target); return -1; } + +int ref_update_expects_existing_old_ref(struct ref_update *update) +{ + return (update->flags & REF_HAVE_OLD) && + (!is_null_oid(&update->old_oid) || update->old_target); +}
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 5f3089d947..194e74eb4d 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c@@ -2412,8 +2412,7 @@ static int lock_ref_for_update(struct files_ref_store *refs, struct strbuf *err) { struct strbuf referent = STRBUF_INIT; - int mustexist = (update->flags & REF_HAVE_OLD) && - !is_null_oid(&update->old_oid); + int mustexist = ref_update_expects_existing_old_ref(update); int ret = 0; struct ref_lock *lock;
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 53a6c5d842..ee298ec0d5 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h@@ -765,4 +765,10 @@ int ref_update_has_null_new_value(struct ref_update *update); int ref_update_check_old_target(const char *referent, struct ref_update *update, struct strbuf *err); +/* + * Check if the ref must exist, this means that the old_oid or + * old_target is non NULL. + */ +int ref_update_expects_existing_old_ref(struct ref_update *update); + #endif /* REFS_REFS_INTERNAL_H */
diff --git a/refs/reftable-backend.c b/refs/reftable-backend.c
index 1af86bbdec..b838cf8f00 100644
--- a/refs/reftable-backend.c
+++ b/refs/reftable-backend.c@@ -824,7 +824,7 @@ static int reftable_be_transaction_prepare(struct ref_store *ref_store, ¤t_oid, &referent, &u->type); if (ret < 0) goto done; - if (ret > 0 && (!(u->flags & REF_HAVE_OLD) || is_null_oid(&u->old_oid))) { + if (ret > 0 && !ref_update_expects_existing_old_ref(u)) { /* * The reference does not exist, and we either have no * old object ID or expect the reference to not exist.
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2.43.GIT