Extract a new function, lock_ref_for_update(), from
ref_transaction_commit().
Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
---
refs/files-backend.c | 152 ++++++++++++++++++++++++++++-----------------------
1 file changed, 85 insertions(+), 67 deletions(-)
diff --git a/refs/files-backend.c b/refs/files-backend.c
index e0d9fa3..546656a 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -3048,6 +3048,88 @@ static int ref_update_reject_duplicates(struct
string_list *refnames,
return 0;
}
+/*
+ * Acquire all locks, verify old values if provided, check
+ * that new values are valid, and write new values to the
+ * lockfiles, ready to be activated. Only keep one lockfile
+ * open at a time to avoid running out of file descriptors.
+ */
+static int lock_ref_for_update(struct ref_update *update,
+ struct ref_transaction *transaction,
+ struct string_list *affected_refnames,
+ struct strbuf *err)
+{
+ int ret;
+
+ if ((update->flags & REF_HAVE_NEW) &&
+ is_null_sha1(update->new_sha1))
+ update->flags |= REF_DELETING;
+ update->lock = lock_ref_sha1_basic(
+ update->refname,
+ ((update->flags & REF_HAVE_OLD) ?
+ update->old_sha1 : NULL),
+ affected_refnames, NULL,
+ update->flags,
+ &update->type,
+ err);
+ if (!update->lock) {
+ char *reason;
+
+ ret = (errno == ENOTDIR)
+ ? TRANSACTION_NAME_CONFLICT
+ : TRANSACTION_GENERIC_ERROR;
+ reason = strbuf_detach(err, NULL);
+ strbuf_addf(err, "cannot lock ref '%s': %s",
+ update->refname, reason);
+ free(reason);
+ return ret;
+ }
+ if ((update->flags & REF_HAVE_NEW) &&
+ !(update->flags & REF_DELETING) &&
+ !(update->flags & REF_LOG_ONLY)) {
+ int overwriting_symref = ((update->type & REF_ISSYMREF) &&
+ (update->flags & REF_NODEREF));
+
+ if (!overwriting_symref &&
+ !hashcmp(update->lock->old_oid.hash, update->new_sha1)) {
+ /*
+ * The reference already has the desired
+ * value, so we don't need to write it.
+ */
+ } else if (write_ref_to_lockfile(update->lock,
+ update->new_sha1,
+ err)) {
+ char *write_err = strbuf_detach(err, NULL);
+
+ /*
+ * The lock was freed upon failure of
+ * write_ref_to_lockfile():
+ */
+ update->lock = NULL;
+ strbuf_addf(err,
+ "cannot update the ref '%s': %s",
+ update->refname, write_err);
+ free(write_err);
+ return TRANSACTION_GENERIC_ERROR;
+ } else {
+ update->flags |= REF_NEEDS_COMMIT;
+ }
+ }
+ if (!(update->flags & REF_NEEDS_COMMIT)) {
+ /*
+ * We didn't call write_ref_to_lockfile(), so
+ * the lockfile is still open. Close it to
+ * free up the file descriptor:
+ */
+ if (close_ref(update->lock)) {
+ strbuf_addf(err, "couldn't close '%s.lock'",
+ update->refname);
+ return TRANSACTION_GENERIC_ERROR;
+ }
+ }
+ return 0;
+}
+
int ref_transaction_commit(struct ref_transaction *transaction,
struct strbuf *err)
{
@@ -3085,74 +3167,10 @@ int ref_transaction_commit(struct ref_transaction
*transaction,
for (i = 0; i < transaction->nr; i++) {
struct ref_update *update = updates[i];
- if ((update->flags & REF_HAVE_NEW) &&
- is_null_sha1(update->new_sha1))
- update->flags |= REF_DELETING;
- update->lock = lock_ref_sha1_basic(
- update->refname,
- ((update->flags & REF_HAVE_OLD) ?
- update->old_sha1 : NULL),
- &affected_refnames, NULL,
- update->flags,
- &update->type,
- err);
- if (!update->lock) {
- char *reason;
-
- ret = (errno == ENOTDIR)
- ? TRANSACTION_NAME_CONFLICT
- : TRANSACTION_GENERIC_ERROR;
- reason = strbuf_detach(err, NULL);
- strbuf_addf(err, "cannot lock ref '%s': %s",
- update->refname, reason);
- free(reason);
+ ret = lock_ref_for_update(update, transaction,
+ &affected_refnames, err);
+ if (ret)
goto cleanup;
- }
- if ((update->flags & REF_HAVE_NEW) &&
- !(update->flags & REF_DELETING) &&
- !(update->flags & REF_LOG_ONLY)) {
- int overwriting_symref = ((update->type & REF_ISSYMREF)
&&
- (update->flags &
REF_NODEREF));
-
- if (!overwriting_symref &&
- !hashcmp(update->lock->old_oid.hash,
update->new_sha1)) {
- /*
- * The reference already has the desired
- * value, so we don't need to write it.
- */
- } else if (write_ref_to_lockfile(update->lock,
- update->new_sha1,
- err)) {
- char *write_err = strbuf_detach(err, NULL);
-
- /*
- * The lock was freed upon failure of
- * write_ref_to_lockfile():
- */
- update->lock = NULL;
- strbuf_addf(err,
- "cannot update the ref '%s': %s",
- update->refname, write_err);
- free(write_err);
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- } else {
- update->flags |= REF_NEEDS_COMMIT;
- }
- }
- if (!(update->flags & REF_NEEDS_COMMIT)) {
- /*
- * We didn't call write_ref_to_lockfile(), so
- * the lockfile is still open. Close it to
- * free up the file descriptor:
- */
- if (close_ref(update->lock)) {
- strbuf_addf(err, "couldn't close '%s.lock'",
- update->refname);
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- }
- }
}
/* Perform updates first so live commits remain referenced */
--
2.8.1
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