[PATCH 12/22] receive-pack.c: use a reference transaction for updating the refs
From: Jonathan Nieder <hidden>
Date: 2016-06-15 23:02:25
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Ronnie Sahlberg <redacted> Date: Mon, 28 Apr 2014 14:36:15 -0700 Wrap all the ref updates inside a transaction. In the new API there is no distinction between failure to lock and failure to write a ref. Both can be permanent (e.g., a ref "refs/heads/topic" is blocking creation of the lock file "refs/heads/topic/1.lock") or transient (e.g., file system full) and there's no clear difference in how the client should respond, so replace the two statuses "failed to lock" and "failed to write" with a single status "failed to update ref". In both cases a more detailed message is sent by sideband to diagnose the problem. Example, before: error: there are still refs under 'refs/heads/topic' remote: error: failed to lock refs/heads/topic To foo ! [remote rejected] HEAD -> topic (failed to lock) After: error: there are still refs under 'refs/heads/topic' remote: error: Cannot lock the ref 'refs/heads/topic'. To foo ! [remote rejected] HEAD -> topic (failed to update ref) Signed-off-by: Ronnie Sahlberg <redacted> Reviewed-by: Michael Haggerty <redacted> Signed-off-by: Jonathan Nieder <redacted> --- builtin/receive-pack.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-)
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index c323081..224fadc 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c@@ -475,7 +475,6 @@ static const char *update(struct command *cmd, struct shallow_info *si) const char *namespaced_name; unsigned char *old_sha1 = cmd->old_sha1; unsigned char *new_sha1 = cmd->new_sha1; - struct ref_lock *lock; /* only refs/... are allowed */ if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
@@ -576,19 +575,27 @@ static const char *update(struct command *cmd, struct shallow_info *si) return NULL; /* good */ } else { + struct strbuf err = STRBUF_INIT; + struct ref_transaction *transaction; + if (shallow_update && si->shallow_ref[cmd->index] && update_shallow_ref(cmd, si)) return "shallow error"; - lock = lock_any_ref_for_update(namespaced_name, old_sha1, - 0, NULL); - if (!lock) { - rp_error("failed to lock %s", name); - return "failed to lock"; - } - if (write_ref_sha1(lock, new_sha1, "push")) { - return "failed to write"; /* error() already called */ + transaction = ref_transaction_begin(&err); + if (!transaction || + ref_transaction_update(transaction, namespaced_name, + new_sha1, old_sha1, 0, 1, &err) || + ref_transaction_commit(transaction, "push", &err)) { + ref_transaction_free(transaction); + + rp_error("%s", err.buf); + strbuf_release(&err); + return "failed to update ref"; } + + ref_transaction_free(transaction); + strbuf_release(&err); return NULL; /* good */ } }
--
2.1.0.rc2.206.gedb03e5