Always handle non-normal (per-worktree or pseudo) refs in the files
backend instead of alternate backends.
Sometimes a ref transaction will update both a per-worktree ref and a
normal ref. For instance, an ordinary commit might update
refs/heads/master and HEAD (or at least HEAD's reflog).
Updates to normal refs continue to go through the chosen backend.
Updates to non-normal refs are moved to a separate files backend
transaction.
Signed-off-by: David Turner <dtur...@twopensource.com>
---
refs.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++------------
1 file changed, 90 insertions(+), 20 deletions(-)
diff --git a/refs.c b/refs.c
index bdde808..b2acf0e 100644
--- a/refs.c
+++ b/refs.c
@@ -9,6 +9,11 @@
#include "object.h"
#include "tag.h"
+static const char split_transaction_fail_warning[] = N_(
+ "A ref transaction was split across two refs backends. Part of the "
+ "transaction succeeded, but then the update to the per-worktree refs "
+ "failed. Your repository may be in an inconsistent state.");
+
/*
* We always have a files backend and it is the default.
*/
@@ -791,6 +796,13 @@ void ref_transaction_free(struct ref_transaction
*transaction)
free(transaction);
}
+static void add_update_obj(struct ref_transaction *transaction,
+ struct ref_update *update)
+{
+ ALLOC_GROW(transaction->updates, transaction->nr + 1,
transaction->alloc);
+ transaction->updates[transaction->nr++] = update;
+}
+
static struct ref_update *add_update(struct ref_transaction *transaction,
const char *refname)
{
@@ -798,8 +810,7 @@ static struct ref_update *add_update(struct ref_transaction
*transaction,
struct ref_update *update = xcalloc(1, sizeof(*update) + len);
memcpy((char *)update->refname, refname, len); /* includes NUL */
- ALLOC_GROW(transaction->updates, transaction->nr + 1,
transaction->alloc);
- transaction->updates[transaction->nr++] = update;
+ add_update_obj(transaction, update);
return update;
}
@@ -1416,11 +1427,37 @@ static int dereference_symrefs(struct ref_transaction
*transaction,
return 0;
}
-int ref_transaction_commit(struct ref_transaction *transaction,
- struct strbuf *err)
+/*
+ * Move all non-normal ref updates into a specially-created
+ * files-backend transaction
+ */
+static int move_abnormal_ref_updates(struct ref_transaction *transaction,
+ struct ref_transaction *files_transaction,
+ struct strbuf *err)
+{
+ int i, normal_nr = 0;
+
+ for (i = 0; i < transaction->nr; i++) {
+ struct ref_update *update = transaction->updates[i];
+
+ if (ref_type(update->refname) == REF_TYPE_NORMAL)
+ transaction->updates[normal_nr++] = update;
+ else
+ add_update_obj(files_transaction, update);
+ }
+
+ transaction->nr = normal_nr;
+ return 0;
+}
+
+static int do_ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err,
+ ref_transaction_commit_fn *commit_fn)
{
int ret = -1;
struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
+ struct string_list files_affected_refnames = STRING_LIST_INIT_NODUP;
+ struct ref_transaction *files_transaction = NULL;
assert(err);
@@ -1436,18 +1473,60 @@ int ref_transaction_commit(struct ref_transaction
*transaction,
if (ret)
goto done;
+ if (the_refs_backend != &refs_be_files) {
+ files_transaction = ref_transaction_begin(err);
+ if (!files_transaction)
+ goto done;
+
+ ret = move_abnormal_ref_updates(transaction, files_transaction,
+ err);
+ if (ret)
+ goto done;
+
+ /* files backend commit */
+ if (get_affected_refnames(files_transaction,
+ &files_affected_refnames,
+ err)) {
+ ret = TRANSACTION_GENERIC_ERROR;
+ goto done;
+ }
+ }
+
+ /* main backend commit */
if (get_affected_refnames(transaction, &affected_refnames, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto done;
}
- ret = the_refs_backend->transaction_commit(transaction,
- &affected_refnames, err);
+ ret = commit_fn(transaction, &affected_refnames, err);
+ if (ret)
+ goto done;
+
+ if (files_transaction) {
+ ret = refs_be_files.transaction_commit(files_transaction,
+ &files_affected_refnames,
+ err);
+ if (ret) {
+ warning(split_transaction_fail_warning);
+ goto done;
+ }
+ }
+
done:
string_list_clear(&affected_refnames, 0);
+ string_list_clear(&files_affected_refnames, 0);
+ if (files_transaction)
+ ref_transaction_free(files_transaction);
return ret;
}
+int ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ return do_ref_transaction_commit(transaction, err,
+ the_refs_backend->transaction_commit);
+}
+
int verify_refname_available(const char *refname, struct string_list *extra,
struct string_list *skip, struct strbuf *err)
{
@@ -1467,6 +1546,9 @@ int peel_ref(const char *refname, unsigned char *sha1)
int create_symref(const char *ref_target, const char *refs_heads_master,
const char *logmsg)
{
+ if (ref_type(ref_target) != REF_TYPE_NORMAL)
+ return refs_be_files.create_symref(ref_target,
refs_heads_master,
+ logmsg);
return the_refs_backend->create_symref(ref_target, refs_heads_master,
logmsg);
}
@@ -1526,20 +1608,8 @@ int reflog_expire(const char *refname, const unsigned
char *sha1,
int initial_ref_transaction_commit(struct ref_transaction *transaction,
struct strbuf *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;
+ return do_ref_transaction_commit(transaction, err,
+
the_refs_backend->initial_transaction_commit);
}
int delete_refs(struct string_list *refnames)
--
2.4.2.767.g62658d5-twtrsrc
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