Allow multiple updates of a ref in the same transaction as long as
each update has have_old and old_sha1 matches the new_sha1 of the
previous update.
Add a test that verifies that a valid sequence such as
create ref a
update ref b a
update ref c b
works and a test that an invalid sequence such as this still fails:
update ref a c
update ref b b
update ref c c
Signed-off-by: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
---
refs.c | 23 +++++++++++++++++------
t/t1400-update-ref.sh | 23 +++++++++++++++++++++--
2 files changed, 38 insertions(+), 8 deletions(-)
diff --git a/refs.c b/refs.c
index 76cab6e..87cdd91 100644
--- a/refs.c
+++ b/refs.c
@@ -3455,12 +3455,6 @@ int transaction_update_sha1(struct ref_transaction *transaction,
if (update->lock)
return 0;
- /* If we could not lock the ref it means we either collided with a
- different command or that we tried to perform a second update to
- the same ref from within the same transaction.
- */
- transaction->status = REF_TRANSACTION_ERROR;
-
/* -1 is the update we just added. Start at -2 and find the most recent
previous update for this ref.
*/
@@ -3472,6 +3466,23 @@ int transaction_update_sha1(struct ref_transaction *transaction,
update->refname))
break;
}
+ /* If the current update has_old==1 and old_sha1 matches the new_sha1
+ * of the previous update then merge the two updates into one.
+ */
+ if (i >= 0 && update->have_old && !hashcmp(update->old_sha1,
+ transaction->updates[i]->new_sha1)) {
+ hashcpy(transaction->updates[i]->new_sha1, update->new_sha1);
+ transaction->nr--;
+ free((char *)transaction->updates[transaction->nr]->msg);
+ free(transaction->updates[transaction->nr]);
+ return 0;
+ }
+ /* If we could not lock the ref it means we either collided with a
+ different command or that we tried to perform a second update to
+ the same ref from within the same transaction.
+ */
+ transaction->status = REF_TRANSACTION_ERROR;
+
if (err)
if (i >= 0) {
const char *str =
diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index f9b7bef..078cd4b 100755
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -446,7 +446,7 @@ test_expect_success 'stdin fails option with unknown name' '
grep "fatal: option unknown: unknown" err
'
-test_expect_success 'stdin fails with duplicate refs' '
+test_expect_success 'stdin fails with duplicate create refs' '
cat >stdin <<-EOF &&
create $a $m
create $b $m
@@ -464,6 +464,25 @@ test_expect_success 'stdin create ref works' '
test_cmp expect actual
'
+test_expect_success 'stdin succeeds with correctly chained update refs' '
+ cat >stdin <<-EOF &&
+ update $a $A $m
+ update $a $B $A
+ update $a $C $B
+ EOF
+ git update-ref --stdin <stdin
+'
+
+test_expect_success 'stdin fails with incorrectly chained update refs' '
+ cat >stdin <<-EOF &&
+ update $a $A $C
+ update $a $B $B
+ update $a $B $B
+ EOF
+ test_must_fail git update-ref --stdin <stdin &&
+ grep "fatal: Multiple updates for ref '"'"'$a'"'"' not allowed." err
+'
+
test_expect_success 'stdin succeeds with quoted argument' '
git update-ref -d $a &&
echo "create $a \"$m\"" >stdin &&
@@ -786,7 +805,7 @@ test_expect_success 'stdin -z fails option with unknown name' '
grep "fatal: option unknown: unknown" err
'
-test_expect_success 'stdin -z fails with duplicate refs' '
+test_expect_success 'stdin -z fails with duplicate create refs' '
printf $F "create $a" "$m" "create $b" "$m" "create $a" "$m" >stdin &&
test_must_fail git update-ref -z --stdin <stdin 2>err &&
grep "fatal: Multiple updates for ref '"'"'$a'"'"' not allowed." err
--
2.0.0.rc3.506.g3739a35
--
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