Define a new transaction update type, UPDATE_LOG, and a new function
transaction_update_reflog. This function will lock the reflog and append
an entry to it during transaction commit.
Signed-off-by: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
---
refs.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
refs.h | 12 ++++++++
2 files changed, 112 insertions(+), 1 deletion(-)
diff --git a/refs.c b/refs.c
index e89a81c..b99fcd9 100644
--- a/refs.c
+++ b/refs.c
@@ -3357,6 +3357,7 @@ int for_each_reflog(each_ref_fn fn, void *cb_data)
enum transaction_update_type {
UPDATE_SHA1 = 0,
+ UPDATE_LOG = 1,
};
/**
@@ -3374,6 +3375,12 @@ struct ref_update {
struct ref_lock *lock;
int type;
char *msg;
+
+ /* used by reflog updates */
+ int reflog_fd;
+ struct lock_file reflog_lock;
+ char *committer;
+
const char refname[FLEX_ARRAY];
};
@@ -3423,6 +3430,7 @@ void transaction_free(struct ref_transaction *transaction)
for (i = 0; i < transaction->nr; i++) {
free(transaction->updates[i]->msg);
+ free(transaction->updates[i]->committer);
free(transaction->updates[i]);
}
free(transaction->updates);
@@ -3443,6 +3451,42 @@ static struct ref_update *add_update(struct ref_transaction *transaction,
return update;
}
+int transaction_update_reflog(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *new_sha1,
+ const unsigned char *old_sha1,
+ const unsigned char *email,
+ unsigned long timestamp, int tz,
+ const char *msg, int flags,
+ struct strbuf *err)
+{
+ struct ref_update *update;
+
+ if (transaction->state != REF_TRANSACTION_OPEN)
+ die("BUG: update_reflog called for transaction that is not "
+ "open");
+
+ update = add_update(transaction, refname, UPDATE_LOG);
+ hashcpy(update->new_sha1, new_sha1);
+ hashcpy(update->old_sha1, old_sha1);
+ update->reflog_fd = -1;
+ if (email) {
+ struct strbuf buf = STRBUF_INIT;
+ char sign = (tz < 0) ? '-' : '+';
+ int zone = (tz < 0) ? (-tz) : tz;
+
+ strbuf_addf(&buf, "%s %lu %c%04d", email, timestamp, sign,
+ zone);
+ update->committer = xstrdup(buf.buf);
+ strbuf_release(&buf);
+ }
+ if (msg)
+ update->msg = xstrdup(msg);
+ update->flags = flags;
+
+ return 0;
+}
+
int transaction_update_sha1(struct ref_transaction *transaction,
const char *refname,
const unsigned char *new_sha1,
@@ -3613,7 +3657,28 @@ int transaction_commit(struct ref_transaction *transaction,
}
}
- /* Perform updates first so live commits remain referenced */
+ /* Lock all reflog files */
+ for (i = 0; i < n; i++) {
+ struct ref_update *update = updates[i];
+
+ if (update->update_type != UPDATE_LOG)
+ continue;
+ update->reflog_fd = hold_lock_file_for_append(
+ &update->reflog_lock,
+ git_path("logs/%s", update->refname),
+ 0);
+ if (update->reflog_fd < 0) {
+ const char *str = "Cannot lock reflog for '%s'. %s";
+
+ ret = -1;
+ if (err)
+ strbuf_addf(err, str, update->refname,
+ strerror(errno));
+ goto cleanup;
+ }
+ }
+
+ /* Perform ref updates first so live commits remain referenced */
for (i = 0; i < n; i++) {
struct ref_update *update = updates[i];
@@ -3649,6 +3714,40 @@ int transaction_commit(struct ref_transaction *transaction,
}
}
+ /* Update all reflog files */
+ for (i = 0; i < n; i++) {
+ struct ref_update *update = updates[i];
+
+ if (update->update_type != UPDATE_LOG)
+ continue;
+ if (update->reflog_fd == -1)
+ continue;
+
+ if (log_ref_write_fd(update->reflog_fd, update->old_sha1,
+ update->new_sha1,
+ update->committer, update->msg)) {
+ error("Could write to reflog: %s. %s",
+ update->refname, strerror(errno));
+ rollback_lock_file(&update->reflog_lock);
+ update->reflog_fd = -1;
+ }
+ }
+
+ /* Commit all reflog files */
+ for (i = 0; i < n; i++) {
+ struct ref_update *update = updates[i];
+
+ if (update->update_type != UPDATE_LOG)
+ continue;
+ if (update->reflog_fd == -1)
+ continue;
+ if (commit_lock_file(&update->reflog_lock)) {
+ error("Could not commit reflog: %s. %s",
+ update->refname, strerror(errno));
+ update->reflog_fd = -1;
+ }
+ }
+
if (repack_without_refs(delnames, delnum, err))
ret = -1;
for (i = 0; i < delnum; i++)
diff --git a/refs.h b/refs.h
index c7ba822..ae8a800 100644
--- a/refs.h
+++ b/refs.h
@@ -318,6 +318,18 @@ int transaction_delete_sha1(struct ref_transaction *transaction,
struct strbuf *err);
/*
+ * Append a reflog entry for refname.
+ */
+int transaction_update_reflog(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *new_sha1,
+ const unsigned char *old_sha1,
+ const unsigned char *email,
+ unsigned long timestamp, int tz,
+ const char *msg, int flags,
+ struct strbuf *err);
+
+/*
* Commit all of the changes that have been queued in transaction, as
* atomically as possible. Return a nonzero value if there is a
* problem.
--
2.0.0.578.gb9e379f
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