Change refs.c to use a single transaction to copy/rename both the refs and
its reflog. Since we are no longer using rename() to move the reflog file
we no longer need to disallow rename_ref for refs with a symlink for its
reflog so we can remove that test from the testsuite.
Change the function to return 1 on failure instead of either -1 or 1.
These changes make the rename_ref operation atomic. This also eliminates the
need to use rename() to shift the reflog around via a temporary filename.
As an extension to this, since we no longer use rename() on the reflog file,
we can now safely perform renames even if the reflog is a symbolic link
and thus can remove the check and fail for that condition.
Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
refs.c | 197 ++++++++++++++++++++----------------------------------
t/t3200-branch.sh | 7 --
2 files changed, 71 insertions(+), 133 deletions(-)
diff --git a/refs.c b/refs.c
index 32f48ea..9c813f9 100644
--- a/refs.c
+++ b/refs.c
@@ -2620,82 +2620,52 @@ int delete_ref(const char *refname, const unsigned char
*sha1, int delopt)
return 0;
}
-/*
- * People using contrib's git-new-workdir have .git/logs/refs ->
- * /some/other/path/.git/logs/refs, and that may live on another device.
- *
- * IOW, to avoid cross device rename errors, the temporary renamed log must
- * live into logs/refs.
- */
-#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
+struct rename_reflog_cb {
+ struct ref_transaction *transaction;
+ const char *refname;
+ struct strbuf *err;
+};
-static int rename_tmp_log(const char *newrefname)
+static int rename_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
+ const char *id, unsigned long timestamp, int tz,
+ const char *message, void *cb_data)
{
- int attempts_remaining = 4;
+ struct rename_reflog_cb *cb = cb_data;
+ struct reflog_committer_info ci;
- retry:
- switch (safe_create_leading_directories(git_path("logs/%s",
newrefname))) {
- case SCLD_OK:
- break; /* success */
- case SCLD_VANISHED:
- if (--attempts_remaining > 0)
- goto retry;
- /* fall through */
- default:
- error("unable to create directory for %s", newrefname);
- return -1;
- }
-
- if (rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname)))
{
- if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining >
0) {
- /*
- * rename(a, b) when b is an existing
- * directory ought to result in ISDIR, but
- * Solaris 5.8 gives ENOTDIR. Sheesh.
- */
- if (remove_empty_directories(git_path("logs/%s",
newrefname))) {
- error("Directory not empty: logs/%s",
newrefname);
- return -1;
- }
- goto retry;
- } else if (errno == ENOENT && --attempts_remaining > 0) {
- /*
- * Maybe another process just deleted one of
- * the directories in the path to newrefname.
- * Try again from the beginning.
- */
- goto retry;
- } else {
- error("unable to move logfile "TMP_RENAMED_LOG" to
logs/%s: %s",
- newrefname, strerror(errno));
- return -1;
- }
- }
- return 0;
+ memset(&ci, 0, sizeof(ci));
+ ci.id = id;
+ ci.timestamp = timestamp;
+ ci.tz = tz;
+ return transaction_update_reflog(cb->transaction, cb->refname,
+ nsha1, osha1, &ci, message, 0,
+ cb->err);
}
-static int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1,
- const char *logmsg);
-
int rename_ref(const char *oldrefname, const char *newrefname, const char
*logmsg)
{
- unsigned char sha1[20], orig_sha1[20];
- int flag = 0, logmoved = 0;
- struct ref_lock *lock;
- struct stat loginfo;
- int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
+ unsigned char sha1[20];
+ int flag = 0, log;
+ struct ref_transaction *transaction = NULL;
+ struct strbuf err = STRBUF_INIT;
const char *symref = NULL;
+ struct rename_reflog_cb cb;
+ struct reflog_committer_info ci;
- if (log && S_ISLNK(loginfo.st_mode))
- return error("reflog for %s is a symlink", oldrefname);
+ memset(&ci, 0, sizeof(ci));
+ ci.committer_info = git_committer_info(0);
- symref = resolve_ref_unsafe(oldrefname, orig_sha1,
+ symref = resolve_ref_unsafe(oldrefname, sha1,
RESOLVE_REF_READING, &flag);
- if (flag & REF_ISSYMREF)
- return error("refname %s is a symbolic ref, renaming it is not
supported",
+ if (flag & REF_ISSYMREF) {
+ error("refname %s is a symbolic ref, renaming it is not
supported",
oldrefname);
- if (!symref)
- return error("refname %s not found", oldrefname);
+ return 1;
+ }
+ if (!symref) {
+ error("refname %s not found", oldrefname);
+ return 1;
+ }
if (!is_refname_available(newrefname, get_packed_refs(&ref_cache),
&oldrefname, 1))
@@ -2705,70 +2675,45 @@ int rename_ref(const char *oldrefname, const char
*newrefname, const char *logms
&oldrefname, 1))
return 1;
- if (log && rename(git_path("logs/%s", oldrefname),
git_path(TMP_RENAMED_LOG)))
- return error("unable to move logfile logs/%s to
"TMP_RENAMED_LOG": %s",
- oldrefname, strerror(errno));
-
- if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
- error("unable to delete old %s", oldrefname);
- goto rollback;
- }
-
- if (!read_ref_full(newrefname, sha1, RESOLVE_REF_READING, NULL) &&
- delete_ref(newrefname, sha1, REF_NODEREF)) {
- if (errno==EISDIR) {
- if (remove_empty_directories(git_path("%s",
newrefname))) {
- error("Directory not empty: %s", newrefname);
- goto rollback;
- }
- } else {
- error("unable to delete existing %s", newrefname);
- goto rollback;
- }
- }
-
- if (log && rename_tmp_log(newrefname))
- goto rollback;
-
- logmoved = log;
-
- lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL, NULL, 0);
- if (!lock) {
- error("unable to lock %s for update", newrefname);
- goto rollback;
- }
- lock->force_write = 1;
- hashcpy(lock->old_sha1, orig_sha1);
- if (write_ref_sha1(lock, orig_sha1, logmsg)) {
- error("unable to write current sha1 into %s", newrefname);
- goto rollback;
- }
-
+ log = reflog_exists(oldrefname);
+ transaction = transaction_begin(&err);
+ if (!transaction)
+ goto fail;
+
+ if (strcmp(oldrefname, newrefname)) {
+ if (log && transaction_update_reflog(transaction, newrefname,
+ sha1, sha1, &ci, NULL,
+ REFLOG_TRUNCATE, &err))
+ goto fail;
+ cb.transaction = transaction;
+ cb.refname = newrefname;
+ cb.err = &err;
+ if (log && for_each_reflog_ent(oldrefname, rename_reflog_ent,
+ &cb))
+ goto fail;
+
+ if (transaction_delete_sha1(transaction, oldrefname, sha1,
+ REF_NODEREF,
+ 1, NULL, &err))
+ goto fail;
+ }
+ if (transaction_update_sha1(transaction, newrefname, sha1,
+ NULL, 0, 0, NULL, &err))
+ goto fail;
+ if (log && transaction_update_reflog(transaction, newrefname, sha1,
+ sha1, &ci, logmsg,
+ REFLOG_COMMITTER_INFO_IS_VALID,
+ &err))
+ goto fail;
+ if (transaction_commit(transaction, &err))
+ goto fail;
+ transaction_free(transaction);
return 0;
- rollback:
- lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL, NULL, 0);
- if (!lock) {
- error("unable to lock %s for rollback", oldrefname);
- goto rollbacklog;
- }
-
- lock->force_write = 1;
- flag = log_all_ref_updates;
- log_all_ref_updates = 0;
- if (write_ref_sha1(lock, orig_sha1, NULL))
- error("unable to write current sha1 into %s", oldrefname);
- log_all_ref_updates = flag;
-
- rollbacklog:
- if (logmoved && rename(git_path("logs/%s", newrefname),
git_path("logs/%s", oldrefname)))
- error("unable to restore logfile %s from %s: %s",
- oldrefname, newrefname, strerror(errno));
- if (!logmoved && log &&
- rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
- error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
- oldrefname, strerror(errno));
-
+ fail:
+ error("rename_ref failed: %s", err.buf);
+ strbuf_release(&err);
+ transaction_free(transaction);
return 1;
}
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index ac31b71..64f5bf2 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -293,13 +293,6 @@ test_expect_success 'renaming a symref is not allowed' '
test_path_is_missing .git/refs/heads/master3
'
-test_expect_success SYMLINKS 'git branch -m u v should fail when the reflog
for u is a symlink' '
- git branch -l u &&
- mv .git/logs/refs/heads/u real-u &&
- ln -s real-u .git/logs/refs/heads/u &&
- test_must_fail git branch -m u v
-'
-
test_expect_success 'test tracking setup via --track' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
--
2.0.1.523.g0041e8a
--
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