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[PATCH v4 11/21] refs: move duplicate check to common code

From
David Turner <dturner@twopensource.com>
Date
Feb 5, 2016, 19:44 UTC
Message-ID
<1454701462-3817-12-git-send-email-dturner@twopensource.com>
In-Reply-To
<1454701462-3817-1-git-send-email-dturner@twopensource.com>

The check for duplicate refnames in a transaction is needed for all backends, so move it to the common code.

ref_transaction_commit_fn gains a new argument, the sorted string_list of affected refnames.

Signed-off-by: David Turner <dturner@twopensource.com>
---
 refs.c               | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 refs/files-backend.c | 57 ++++---------------------------------------
 refs/refs-internal.h |  1 +
 3 files changed, 73 insertions(+), 54 deletions(-)
diff --git a/refs.c b/refs.c
index e04fddc..283a5ec 100644
--- a/refs.c
+++ b/refs.c
@@ -1116,6 +1116,36 @@ int rename_ref_available(const char *oldname, const char *newname)
 	return ret;
 }
 
+/*
+ * Return 1 if there are any duplicate refnames in the updates in
+ * `transaction`, and fill in err with an appropriate error message.
+ * Fill in `refnames` with the refnames from the transaction.
+ */
+static int get_affected_refnames(struct ref_transaction *transaction,
+				 struct string_list *refnames,
+				 struct strbuf *err)
+{
+	int i, n = transaction->nr;
+	struct ref_update **updates;
+
+	assert(err);
+
+	updates = transaction->updates;
+	/* Fail if a refname appears more than once in the transaction: */
+	for (i = 0; i < n; i++)
+		string_list_append(refnames, updates[i]->refname);
+	string_list_sort(refnames);
+
+	for (i = 1; i < n; i++)
+		if (!strcmp(refnames->items[i - 1].string, refnames->items[i].string)) {
+			strbuf_addf(err,
+				    "Multiple updates for ref '%s' not allowed.",
+				    refnames->items[i].string);
+			return 1;
+		}
+	return 0;
+}
+
 /* backend functions */
 int refs_init_db(struct strbuf *err, int shared)
 {
@@ -1125,7 +1155,29 @@ int refs_init_db(struct strbuf *err, int shared)
 int ref_transaction_commit(struct ref_transaction *transaction,
 			   struct strbuf *err)
 {
-	return the_refs_backend->transaction_commit(transaction, err);
+	int ret = -1;
+	struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
+
+	assert(err);
+
+	if (transaction->state != REF_TRANSACTION_OPEN)
+		die("BUG: commit called for transaction that is not open");
+
+	if (!transaction->nr) {
+		transaction->state = REF_TRANSACTION_CLOSED;
+		return 0;
+	}
+
+	if (get_affected_refnames(transaction, &affected_refnames, err)) {
+		ret = TRANSACTION_GENERIC_ERROR;
+		goto done;
+	}
+
+	ret = the_refs_backend->transaction_commit(transaction,
+						   &affected_refnames, err);
+done:
+	string_list_clear(&affected_refnames, 0);
+	return ret;
 }
 
 int delete_refs(struct string_list *refnames)
@@ -1277,5 +1329,18 @@ int reflog_expire(const char *refname, const unsigned char *sha1,
 int initial_ref_transaction_commit(struct ref_transaction *transaction,
 				   struct strbuf *err)
 {
-	return the_refs_backend->initial_transaction_commit(transaction, err);
+	struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
+	int ret;
+
+	if (get_affected_refnames(transaction,
+				  &affected_refnames, err)) {
+		ret = TRANSACTION_GENERIC_ERROR;
+		goto done;
+	}
+	ret = the_refs_backend->initial_transaction_commit(transaction,
+							   &affected_refnames,
+							   err);
+done:
+	string_list_clear(&affected_refnames, 0);
+	return ret;
 }
diff --git a/refs/files-backend.c b/refs/files-backend.c
index aa11ba2..0ad60bc 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -3154,24 +3154,8 @@ static int files_for_each_reflog(each_ref_fn fn, void *cb_data)
 	return retval;
 }
 
-static int ref_update_reject_duplicates(struct string_list *refnames,
-					struct strbuf *err)
-{
-	int i, n = refnames->nr;
-
-	assert(err);
-
-	for (i = 1; i < n; i++)
-		if (!strcmp(refnames->items[i - 1].string, refnames->items[i].string)) {
-			strbuf_addf(err,
-				    "Multiple updates for ref '%s' not allowed.",
-				    refnames->items[i].string);
-			return 1;
-		}
-	return 0;
-}
-
 static int files_transaction_commit(struct ref_transaction *transaction,
+				    struct string_list *affected_refnames,
 				    struct strbuf *err)
 {
 	int ret = 0, i;
@@ -3179,26 +3163,6 @@ static int files_transaction_commit(struct ref_transaction *transaction,
 	struct ref_update **updates = transaction->updates;
 	struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
 	struct string_list_item *ref_to_delete;
-	struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
-
-	assert(err);
-
-	if (transaction->state != REF_TRANSACTION_OPEN)
-		die("BUG: commit called for transaction that is not open");
-
-	if (!n) {
-		transaction->state = REF_TRANSACTION_CLOSED;
-		return 0;
-	}
-
-	/* Fail if a refname appears more than once in the transaction: */
-	for (i = 0; i < n; i++)
-		string_list_append(&affected_refnames, updates[i]->refname);
-	string_list_sort(&affected_refnames);
-	if (ref_update_reject_duplicates(&affected_refnames, err)) {
-		ret = TRANSACTION_GENERIC_ERROR;
-		goto cleanup;
-	}
 
 	/*
 	 * Acquire all locks, verify old values if provided, check
@@ -3217,7 +3181,7 @@ static int files_transaction_commit(struct ref_transaction *transaction,
 				update->refname,
 				((update->flags & REF_HAVE_OLD) ?
 				 update->old_sha1 : NULL),
-				&affected_refnames, NULL,
+				affected_refnames, NULL,
 				update->flags,
 				&update->type,
 				err);
@@ -3329,7 +3293,6 @@ cleanup:
 		if (updates[i]->backend_data)
 			unlock_ref(updates[i]->backend_data);
 	string_list_clear(&refs_to_delete, 0);
-	string_list_clear(&affected_refnames, 0);
 	return ret;
 }
 
@@ -3342,27 +3305,18 @@ static int ref_present(const char *refname,
 }
 
 static int files_initial_transaction_commit(struct ref_transaction *transaction,
+					    struct string_list *affected_refnames,
 					    struct strbuf *err)
 {
 	int ret = 0, i;
 	int n = transaction->nr;
 	struct ref_update **updates = transaction->updates;
-	struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
 
 	assert(err);
 
 	if (transaction->state != REF_TRANSACTION_OPEN)
 		die("BUG: commit called for transaction that is not open");
 
-	/* Fail if a refname appears more than once in the transaction: */
-	for (i = 0; i < n; i++)
-		string_list_append(&affected_refnames, updates[i]->refname);
-	string_list_sort(&affected_refnames);
-	if (ref_update_reject_duplicates(&affected_refnames, err)) {
-		ret = TRANSACTION_GENERIC_ERROR;
-		goto cleanup;
-	}
-
 	/*
 	 * It's really undefined to call this function in an active
 	 * repository or when there are existing references: we are
@@ -3375,7 +3329,7 @@ static int files_initial_transaction_commit(struct ref_transaction *transaction,
 	 * so here we really only check that none of the references
 	 * that we are creating already exists.
 	 */
-	if (for_each_rawref(ref_present, &affected_refnames))
+	if (for_each_rawref(ref_present, affected_refnames))
 		die("BUG: initial ref transaction called with existing refs");
 
 	for (i = 0; i < n; i++) {
@@ -3385,7 +3339,7 @@ static int files_initial_transaction_commit(struct ref_transaction *transaction,
 		    !is_null_sha1(update->old_sha1))
 			die("BUG: initial ref transaction with old_sha1 set");
 		if (verify_refname_available(update->refname,
-					     &affected_refnames, NULL,
+					     affected_refnames, NULL,
 					     err)) {
 			ret = TRANSACTION_NAME_CONFLICT;
 			goto cleanup;
@@ -3416,7 +3370,6 @@ static int files_initial_transaction_commit(struct ref_transaction *transaction,
 
 cleanup:
 	transaction->state = REF_TRANSACTION_CLOSED;
-	string_list_clear(&affected_refnames, 0);
 	return ret;
 }
 
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 3dec075..fc5d1db 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -217,6 +217,7 @@ int rename_ref_available(const char *oldname, const char *newname);
 /* refs backends */
 typedef int ref_init_db_fn(struct strbuf *err, int shared);
 typedef int ref_transaction_commit_fn(struct ref_transaction *transaction,
+				      struct string_list *affected_refnames,
 				      struct strbuf *err);
 
 /* reflog functions */

-- 
2.4.2.749.g730654d-twtrsrc
Previous: David TurnerNext: David Turner
Message 20 of 53 in “refs backend”
  1. 00/20 refs backendDavid Turner, Feb 5, 2016
  2. 01/21 refs: add a backend method structure with transaction functionsDavid Turner, Feb 5, 2016
  3. 02/21 refs: add methods for misc ref operationsDavid Turner, Feb 5, 2016
  4. Michael HaggertyFeb 11, 2016
  5. David TurnerFeb 12, 2016
  6. 03/21 refs: add methods for the ref iteratorsDavid Turner, Feb 5, 2016
  7. Michael HaggertyFeb 11, 2016
  8. David TurnerFeb 12, 2016
  9. 04/21 refs: add do_for_each_per_worktree_refDavid Turner, Feb 5, 2016
  10. 05/21 refs: add methods for reflogDavid Turner, Feb 5, 2016
  11. 06/21 refs: add method for initial ref transaction commitDavid Turner, Feb 5, 2016
  12. 07/21 refs: add method for delete_refsDavid Turner, Feb 5, 2016
  13. 08/21 refs: add methods to init refs dbDavid Turner, Feb 5, 2016
  14. Michael HaggertyFeb 11, 2016
  15. David TurnerFeb 11, 2016
  16. 09/21 refs: add method to rename refsDavid Turner, Feb 5, 2016
  17. Michael HaggertyFeb 11, 2016
  18. David TurnerFeb 11, 2016
  19. 10/21 refs: make lock genericDavid Turner, Feb 5, 2016
  20. 11/21 refs: move duplicate check to common codeDavid Turner, Feb 5, 2016
  21. 12/21 refs: allow log-only updatesDavid Turner, Feb 5, 2016
  22. Michael HaggertyFeb 11, 2016
  23. David TurnerFeb 11, 2016
  24. 13/21 refs: resolve symbolic refs firstDavid Turner, Feb 5, 2016
  25. Michael HaggertyFeb 12, 2016
  26. David TurnerFeb 18, 2016
  27. Michael HaggertyFeb 18, 2016
  28. 14/21 refs: always handle non-normal refs in files backendDavid Turner, Feb 5, 2016
  29. Michael HaggertyFeb 12, 2016
  30. David TurnerFeb 18, 2016
  31. Michael HaggertyFeb 18, 2016
  32. David TurnerFeb 18, 2016
  33. 15/21 init: allow alternate ref strorage to be set for new reposDavid Turner, Feb 5, 2016
  34. Michael HaggertyFeb 12, 2016
  35. David TurnerFeb 17, 2016
  36. Michael HaggertyFeb 18, 2016
  37. 16/21 refs: check submodules ref storage configDavid Turner, Feb 5, 2016
  38. 17/21 clone: allow ref storage backend to be set for cloneDavid Turner, Feb 5, 2016
  39. 18/21 svn: learn ref-storage argumentDavid Turner, Feb 5, 2016
  40. 19/21 refs: add register_ref_storage_backends()David Turner, Feb 5, 2016
  41. Michael HaggertyFeb 12, 2016
  42. David TurnerFeb 17, 2016
  43. 20/21 refs: add LMDB refs storage backendDavid Turner, Feb 5, 2016
  44. Michael HaggertyFeb 11, 2016
  45. David TurnerFeb 11, 2016
  46. Michael HaggertyFeb 12, 2016
  47. David TurnerFeb 13, 2016
  48. Duy NguyenFeb 14, 2016
  49. Duy NguyenFeb 15, 2016
  50. David TurnerFeb 16, 2016
  51. David TurnerFeb 17, 2016
  52. 21/21 refs: tests for lmdb backendDavid Turner, Feb 5, 2016
  53. Junio C HamanoFeb 8, 2016

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