From: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
Add a flag that allows us to truncate the reflog before we write the
update.
Signed-off-by: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---
refs.c | 17 +++++++++++++++--
refs.h | 10 +++++++++-
2 files changed, 24 insertions(+), 3 deletions(-)
diff --git a/refs.c b/refs.c
index 9a46e1c..d21ecb9 100644
--- a/refs.c
+++ b/refs.c
@@ -3873,7 +3873,12 @@ int transaction_commit(struct transaction *transaction,
}
}
- /* Update all reflog files */
+ /*
+ * Update all reflog files
+ * We have already done all ref updates and deletes.
+ * There is not much we can do here if there are any reflog
+ * update errors other than complain.
+ */
for (i = 0; i < n; i++) {
struct ref_update *update = updates[i];
@@ -3881,7 +3886,15 @@ int transaction_commit(struct transaction *transaction,
continue;
if (update->reflog_fd == -1)
continue;
-
+ if (update->flags & REFLOG_TRUNCATE)
+ if (lseek(update->reflog_fd, 0, SEEK_SET) < 0 ||
+ ftruncate(update->reflog_fd, 0)) {
+ error("Could not truncate reflog: %s. %s",
+ update->refname, strerror(errno));
+ rollback_lock_file(&update->reflog_lock);
+ update->reflog_fd = -1;
+ continue;
+ }
if (log_ref_write_fd(update->reflog_fd, update->old_sha1,
update->new_sha1,
update->committer, update->msg)) {
diff --git a/refs.h b/refs.h
index 8220d18..5075073 100644
--- a/refs.h
+++ b/refs.h
@@ -328,7 +328,15 @@ int transaction_delete_ref(struct transaction *transaction,
struct strbuf *err);
/*
- * Append a reflog entry for refname.
+ * Flags controlling transaction_update_reflog().
+ * REFLOG_TRUNCATE: Truncate the reflog.
+ *
+ * Flags >= 0x100 are reserved for internal use.
+ */
+#define REFLOG_TRUNCATE 0x01
+/*
+ * Append a reflog entry for refname. If the REFLOG_TRUNCATE flag is set
+ * this update will first truncate the reflog before writing the entry.
*/
int transaction_update_reflog(struct transaction *transaction,
const char *refname,
--
2.2.0.rc2.5.gf7b9fb2
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