[PATCH v8 4/6] refs: add TRANSACTION_CREATE_EXISTS error
From: Bence Ferdinandy <hidden>
Date: 2024-10-14 22:55:40
Subsystem:
the rest · Maintainer:
Linus Torvalds
Currently there is only one special error for transaction, for when
there is a naming conflict, all other errors are dumped under a generic
error. Add a new special error case for when the caller requests the
reference to be updated only when it does not yet exist and the
reference actually does exist.
Signed-off-by: Bence Ferdinandy <redacted>
---
Notes:
v4: new patch
v5: no change
v6: no change
v7: - change commit prefix to be more in line with project standards
- changed error checking to Karthik's suggestion
v8: no change
refs.h | 4 +++-
refs/files-backend.c | 24 ++++++++++++++++--------
refs/reftable-backend.c | 6 ++++--
3 files changed, 23 insertions(+), 11 deletions(-)
diff --git a/refs.h b/refs.h
index b09a3a4384..c83b1ec76e 100644
--- a/refs.h
+++ b/refs.h@@ -759,8 +759,10 @@ int ref_transaction_verify(struct ref_transaction *transaction, /* Naming conflict (for example, the ref names A and A/B conflict). */ #define TRANSACTION_NAME_CONFLICT -1 +/* When only creation was requested, but the ref already exists. */ +#define TRANSACTION_CREATE_EXISTS -2 /* All other errors. */ -#define TRANSACTION_GENERIC_ERROR -2 +#define TRANSACTION_GENERIC_ERROR -3 /* * Perform the preparatory stages of committing `transaction`. Acquire
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 0824c0b8a9..e743ec44b5 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c@@ -2502,14 +2502,18 @@ static int split_symref_update(struct ref_update *update, static int check_old_oid(struct ref_update *update, struct object_id *oid, struct strbuf *err) { + int ret = TRANSACTION_GENERIC_ERROR; + if (!(update->flags & REF_HAVE_OLD) || oideq(oid, &update->old_oid)) return 0; - if (is_null_oid(&update->old_oid)) + if (is_null_oid(&update->old_oid)) { strbuf_addf(err, "cannot lock ref '%s': " "reference already exists", ref_update_original_update_refname(update)); + ret = TRANSACTION_CREATE_EXISTS; + } else if (is_null_oid(oid)) strbuf_addf(err, "cannot lock ref '%s': " "reference is missing but expected %s",
@@ -2522,7 +2526,7 @@ static int check_old_oid(struct ref_update *update, struct object_id *oid, oid_to_hex(oid), oid_to_hex(&update->old_oid)); - return -1; + return ret; } /*
@@ -2602,9 +2606,11 @@ static int lock_ref_for_update(struct files_ref_store *refs, ret = TRANSACTION_GENERIC_ERROR; goto out; } - } else if (check_old_oid(update, &lock->old_oid, err)) { - ret = TRANSACTION_GENERIC_ERROR; - goto out; + } else { + ret = check_old_oid(update, &lock->old_oid, err); + if (ret) { + goto out; + } } } else { /*
@@ -2635,9 +2641,11 @@ static int lock_ref_for_update(struct files_ref_store *refs, update->old_target); ret = TRANSACTION_GENERIC_ERROR; goto out; - } else if (check_old_oid(update, &lock->old_oid, err)) { - ret = TRANSACTION_GENERIC_ERROR; - goto out; + } else { + ret = check_old_oid(update, &lock->old_oid, err); + if (ret) { + goto out; + } } /*
diff --git a/refs/reftable-backend.c b/refs/reftable-backend.c
index 3c96fbf66f..ebf8e57fbc 100644
--- a/refs/reftable-backend.c
+++ b/refs/reftable-backend.c@@ -1206,10 +1206,13 @@ static int reftable_be_transaction_prepare(struct ref_store *ref_store, goto done; } } else if ((u->flags & REF_HAVE_OLD) && !oideq(¤t_oid, &u->old_oid)) { - if (is_null_oid(&u->old_oid)) + ret = TRANSACTION_NAME_CONFLICT; + if (is_null_oid(&u->old_oid)) { strbuf_addf(err, _("cannot lock ref '%s': " "reference already exists"), ref_update_original_update_refname(u)); + ret = TRANSACTION_CREATE_EXISTS; + } else if (is_null_oid(¤t_oid)) strbuf_addf(err, _("cannot lock ref '%s': " "reference is missing but expected %s"),
@@ -1221,7 +1224,6 @@ static int reftable_be_transaction_prepare(struct ref_store *ref_store, ref_update_original_update_refname(u), oid_to_hex(¤t_oid), oid_to_hex(&u->old_oid)); - ret = -1; goto done; }
--
2.47.0.7.g072c39eddb.dirty