#include "dir.h"
#include "string-list.h"
+struct ref_lock {
+ char *ref_name;
+ char *orig_ref_name;
+ struct lock_file *lk;
+ unsigned char old_sha1[20];
+ int lock_fd;
+};
+
/*
* How to handle various characters in refnames:
* 0: An acceptable character for refs
};
/*
- * Used as a flag to ref_transaction_delete when a loose ref is being
+ * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken
+ * refs (i.e., because the reference is about to be deleted anyway).
+ */
+#define REF_DELETING 0x02
+
+/*
+ * Used as a flag in ref_update::flags when a loose ref is being
* pruned.
*/
-#define REF_ISPRUNING 0x0100
+#define REF_ISPRUNING 0x04
+
+/*
+ * Used as a flag in ref_update::flags when the reference should be
+ * updated to new_sha1.
+ */
+#define REF_HAVE_NEW 0x08
+
+/*
+ * Used as a flag in ref_update::flags when old_sha1 should be
+ * checked.
+ */
+#define REF_HAVE_OLD 0x10
+
/*
* Try to read one refname component from the front of refname.
* Return the length of the component found, or -1 if the component is
if (check_name &&
check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
die("Reference has invalid format: '%s'", refname);
- if (!check_name && !refname_is_safe(refname))
- die("Reference has invalid name: '%s'", refname);
len = strlen(refname) + 1;
ref = xmalloc(sizeof(struct ref_entry) + len);
hashcpy(ref->u.value.sha1, sha1);
int flag = REF_ISPACKED;
if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
+ if (!refname_is_safe(refname))
+ die("packed refname is dangerous: %s", refname);
hashclr(sha1);
flag |= REF_BAD_NAME | REF_ISBROKEN;
}
}
if (check_refname_format(refname.buf,
REFNAME_ALLOW_ONELEVEL)) {
+ if (!refname_is_safe(refname.buf))
+ die("loose refname is dangerous: %s", refname.buf);
hashclr(sha1);
flag |= REF_BAD_NAME | REF_ISBROKEN;
}
{
int fd, len;
char buffer[128], *p;
- char *path;
+ const char *path;
if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
return -1;
}
/* This function needs to return a meaningful errno on failure */
-const char *resolve_ref_unsafe(const char *refname, int resolve_flags, unsigned char *sha1, int *flags)
+static const char *resolve_ref_unsafe_1(const char *refname,
+ int resolve_flags,
+ unsigned char *sha1,
+ int *flags,
+ struct strbuf *sb_path)
{
int depth = MAXDEPTH;
ssize_t len;
bad_name = 1;
}
for (;;) {
- char path[PATH_MAX];
+ const char *path;
struct stat st;
char *buf;
int fd;
return NULL;
}
- git_snpath(path, sizeof(path), "%s", refname);
+ strbuf_reset(sb_path);
+ strbuf_git_path(sb_path, "%s", refname);
+ path = sb_path->buf;
/*
* We might have to loop back here to avoid a race
}
}
+const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags)
+{
+ struct strbuf sb_path = STRBUF_INIT;
+ const char *ret = resolve_ref_unsafe_1(refname, resolve_flags,
+ sha1, flags, &sb_path);
+ strbuf_release(&sb_path);
+ return ret;
+}
+
char *resolve_refdup(const char *ref, int resolve_flags, unsigned char *sha1, int *flags)
{
return xstrdup_or_null(resolve_ref_unsafe(ref, resolve_flags, sha1, flags));
return 0;
}
+static void unlock_ref(struct ref_lock *lock)
+{
+ /* Do not free lock->lk -- atexit() still looks at them */
+ if (lock->lk)
+ rollback_lock_file(lock->lk);
+ free(lock->ref_name);
+ free(lock->orig_ref_name);
+ free(lock);
+}
+
/* This function should make sure errno is meaningful on error */
static struct ref_lock *verify_lock(struct ref_lock *lock,
const unsigned char *old_sha1, int mustexist)
static struct ref_lock *lock_ref_sha1_basic(const char *refname,
const unsigned char *old_sha1,
const struct string_list *skip,
- int flags, int *type_p)
+ unsigned int flags, int *type_p)
{
- char *ref_file;
+ const char *ref_file;
const char *orig_refname = refname;
struct ref_lock *lock;
int last_errno = 0;
int type, lflags;
int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
int resolve_flags = 0;
- int missing = 0;
int attempts_remaining = 3;
lock = xcalloc(1, sizeof(struct ref_lock));
orig_refname, strerror(errno));
goto error_return;
}
- missing = is_null_sha1(lock->old_sha1);
- /* When the ref did not exist and we are creating it,
- * make sure there is no existing ref that is packed
- * whose name begins with our refname, nor a ref whose
- * name is a proper prefix of our refname.
+ /*
+ * If the ref did not exist and we are creating it, make sure
+ * there is no existing packed ref whose name begins with our
+ * refname, nor a packed ref whose name is a proper prefix of
+ * our refname.
*/
- if (missing &&
+ if (is_null_sha1(lock->old_sha1) &&
!is_refname_available(refname, skip, get_packed_refs(&ref_cache))) {
last_errno = ENOTDIR;
goto error_return;
lock->ref_name = xstrdup(refname);
lock->orig_ref_name = xstrdup(orig_refname);
ref_file = git_path("%s", refname);
- if (missing)
- lock->force_write = 1;
- if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
- lock->force_write = 1;
retry:
- switch (safe_create_leading_directories(ref_file)) {
+ switch (safe_create_leading_directories_const(ref_file)) {
case SCLD_OK:
break; /* success */
case SCLD_VANISHED:
return NULL;
}
-struct ref_lock *lock_any_ref_for_update(const char *refname,
- const unsigned char *old_sha1,
- int flags, int *type_p)
-{
- return lock_ref_sha1_basic(refname, old_sha1, NULL, flags, type_p);
-}
-
/*
* Write an entry to the packed-refs file for the specified refname.
* If peeled is non-NULL, write it as the entry's peeled value.
transaction = ref_transaction_begin(&err);
if (!transaction ||
ref_transaction_delete(transaction, r->name, r->sha1,
- REF_ISPRUNING, 1, NULL, &err) ||
+ REF_ISPRUNING, NULL, &err) ||
ref_transaction_commit(transaction, &err)) {
ref_transaction_free(transaction);
error("%s", err.buf);
return 0;
}
-int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
+int delete_ref(const char *refname, const unsigned char *sha1, unsigned int flags)
{
struct ref_transaction *transaction;
struct strbuf err = STRBUF_INIT;
transaction = ref_transaction_begin(&err);
if (!transaction ||
- ref_transaction_delete(transaction, refname, sha1, delopt,
- sha1 && !is_null_sha1(sha1), NULL, &err) ||
+ ref_transaction_delete(transaction, refname,
+ (sha1 && !is_null_sha1(sha1)) ? sha1 : NULL,
+ flags, NULL, &err) ||
ref_transaction_commit(transaction, &err)) {
error("%s", err.buf);
ref_transaction_free(transaction);
int attempts_remaining = 4;
retry:
- switch (safe_create_leading_directories(git_path("logs/%s", newrefname))) {
+ switch (safe_create_leading_directories_const(git_path("logs/%s", newrefname))) {
case SCLD_OK:
break; /* success */
case SCLD_VANISHED:
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 rollbacklog;
}
- lock->force_write = 1;
flag = log_all_ref_updates;
log_all_ref_updates = 0;
if (write_ref_sha1(lock, orig_sha1, NULL))
return 1;
}
-int close_ref(struct ref_lock *lock)
+static int close_ref(struct ref_lock *lock)
{
if (close_lock_file(lock->lk))
return -1;
return 0;
}
-int commit_ref(struct ref_lock *lock)
+static int commit_ref(struct ref_lock *lock)
{
if (commit_lock_file(lock->lk))
return -1;
return 0;
}
-void unlock_ref(struct ref_lock *lock)
-{
- /* Do not free lock->lk -- atexit() still looks at them */
- if (lock->lk)
- rollback_lock_file(lock->lk);
- free(lock->ref_name);
- free(lock->orig_ref_name);
- free(lock);
-}
-
/*
* copy the reflog message msg to buf, which has been allocated sufficiently
* large, while cleaning up the whitespaces. Especially, convert LF to space,
}
/* This function must set a meaningful errno on failure */
-int log_ref_setup(const char *refname, char *logfile, int bufsize)
+int log_ref_setup(const char *refname, struct strbuf *sb_logfile)
{
int logfd, oflags = O_APPEND | O_WRONLY;
+ char *logfile;
- git_snpath(logfile, bufsize, "logs/%s", refname);
+ strbuf_git_path(sb_logfile, "logs/%s", refname);
+ logfile = sb_logfile->buf;
+ /* make sure the rest of the function can't change "logfile" */
+ sb_logfile = NULL;
if (log_all_ref_updates &&
(starts_with(refname, "refs/heads/") ||
starts_with(refname, "refs/remotes/") ||
return 0;
}
-static int log_ref_write(const char *refname, const unsigned char *old_sha1,
- const unsigned char *new_sha1, const char *msg)
+static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
+ const unsigned char *new_sha1,
+ const char *committer, const char *msg)
{
- int logfd, result, written, oflags = O_APPEND | O_WRONLY;
+ int msglen, written;
unsigned maxlen, len;
- int msglen;
- char log_file[PATH_MAX];
char *logrec;
- const char *committer;
-
- if (log_all_ref_updates < 0)
- log_all_ref_updates = !is_bare_repository();
- result = log_ref_setup(refname, log_file, sizeof(log_file));
- if (result)
- return result;
-
- logfd = open(log_file, oflags);
- if (logfd < 0)
- return 0;
msglen = msg ? strlen(msg) : 0;
- committer = git_committer_info(0);
maxlen = strlen(committer) + msglen + 100;
logrec = xmalloc(maxlen);
len = sprintf(logrec, "%s %s %s\n",
committer);
if (msglen)
len += copy_msg(logrec + len - 1, msg) - 1;
- written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
+
+ written = len <= maxlen ? write_in_full(fd, logrec, len) : -1;
free(logrec);
- if (written != len) {
+ if (written != len)
+ return -1;
+
+ return 0;
+}
+
+static int log_ref_write_1(const char *refname, const unsigned char *old_sha1,
+ const unsigned char *new_sha1, const char *msg,
+ struct strbuf *sb_log_file)
+{
+ int logfd, result, oflags = O_APPEND | O_WRONLY;
+ char *log_file;
+
+ if (log_all_ref_updates < 0)
+ log_all_ref_updates = !is_bare_repository();
+
+ result = log_ref_setup(refname, sb_log_file);
+ if (result)
+ return result;
+ log_file = sb_log_file->buf;
+ /* make sure the rest of the function can't change "log_file" */
+ sb_log_file = NULL;
+
+ logfd = open(log_file, oflags);
+ if (logfd < 0)
+ return 0;
+ result = log_ref_write_fd(logfd, old_sha1, new_sha1,
+ git_committer_info(0), msg);
+ if (result) {
int save_errno = errno;
close(logfd);
error("Unable to append to %s", log_file);
return 0;
}
+static int log_ref_write(const char *refname, const unsigned char *old_sha1,
+ const unsigned char *new_sha1, const char *msg)
+{
+ struct strbuf sb = STRBUF_INIT;
+ int ret = log_ref_write_1(refname, old_sha1, new_sha1, msg, &sb);
+ strbuf_release(&sb);
+ return ret;
+}
+
int is_branch(const char *refname)
{
return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
static char term = '\n';
struct object *o;
- if (!lock) {
- errno = EINVAL;
- return -1;
- }
- if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
- unlock_ref(lock);
- return 0;
- }
o = parse_object(sha1);
if (!o) {
error("Trying to write ref %s with nonexistent object %s",
}
/**
- * Information needed for a single ref update. Set new_sha1 to the
- * new value or to zero to delete the ref. To check the old value
- * while locking the ref, set have_old to 1 and set old_sha1 to the
- * value or to zero to ensure the ref does not exist before update.
+ * Information needed for a single ref update. Set new_sha1 to the new
+ * value or to null_sha1 to delete the ref. To check the old value
+ * while the ref is locked, set (flags & REF_HAVE_OLD) and set
+ * old_sha1 to the old value, or to null_sha1 to ensure the ref does
+ * not exist before update.
*/
struct ref_update {
+ /*
+ * If (flags & REF_HAVE_NEW), set the reference to this value:
+ */
unsigned char new_sha1[20];
+ /*
+ * If (flags & REF_HAVE_OLD), check that the reference
+ * previously had this value:
+ */
unsigned char old_sha1[20];
- int flags; /* REF_NODEREF? */
- int have_old; /* 1 if old_sha1 is valid, 0 otherwise */
+ /*
+ * One or more of REF_HAVE_NEW, REF_HAVE_OLD, REF_NODEREF,
+ * REF_DELETING, and REF_ISPRUNING:
+ */
+ unsigned int flags;
struct ref_lock *lock;
int type;
char *msg;
const char *refname,
const unsigned char *new_sha1,
const unsigned char *old_sha1,
- int flags, int have_old, const char *msg,
+ unsigned int flags, const char *msg,
struct strbuf *err)
{
struct ref_update *update;
if (transaction->state != REF_TRANSACTION_OPEN)
die("BUG: update called for transaction that is not open");
- if (have_old && !old_sha1)
- die("BUG: have_old is true but old_sha1 is NULL");
-
- if (!is_null_sha1(new_sha1) &&
+ if (new_sha1 && !is_null_sha1(new_sha1) &&
check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
strbuf_addf(err, "refusing to update ref with bad name %s",
refname);
}
update = add_update(transaction, refname);
- hashcpy(update->new_sha1, new_sha1);
- update->flags = flags;
- update->have_old = have_old;
- if (have_old)
+ if (new_sha1) {
+ hashcpy(update->new_sha1, new_sha1);
+ flags |= REF_HAVE_NEW;
+ }
+ if (old_sha1) {
hashcpy(update->old_sha1, old_sha1);
+ flags |= REF_HAVE_OLD;
+ }
+ update->flags = flags;
if (msg)
update->msg = xstrdup(msg);
return 0;
int ref_transaction_create(struct ref_transaction *transaction,
const char *refname,
const unsigned char *new_sha1,
- int flags, const char *msg,
+ unsigned int flags, const char *msg,
struct strbuf *err)
{
- struct ref_update *update;
-
- assert(err);
-
- if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: create called for transaction that is not open");
-
if (!new_sha1 || is_null_sha1(new_sha1))
- die("BUG: create ref with null new_sha1");
-
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
- strbuf_addf(err, "refusing to create ref with bad name %s",
- refname);
- return -1;
- }
-
- update = add_update(transaction, refname);
-
- hashcpy(update->new_sha1, new_sha1);
- hashclr(update->old_sha1);
- update->flags = flags;
- update->have_old = 1;
- if (msg)
- update->msg = xstrdup(msg);
- return 0;
+ die("BUG: create called without valid new_sha1");
+ return ref_transaction_update(transaction, refname, new_sha1,
+ null_sha1, flags, msg, err);
}
int ref_transaction_delete(struct ref_transaction *transaction,
const char *refname,
const unsigned char *old_sha1,
- int flags, int have_old, const char *msg,
+ unsigned int flags, const char *msg,
struct strbuf *err)
{
- struct ref_update *update;
-
- assert(err);
-
- if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: delete called for transaction that is not open");
-
- if (have_old && !old_sha1)
- die("BUG: have_old is true but old_sha1 is NULL");
+ if (old_sha1 && is_null_sha1(old_sha1))
+ die("BUG: delete called with old_sha1 set to zeros");
+ return ref_transaction_update(transaction, refname,
+ null_sha1, old_sha1,
+ flags, msg, err);
+}
- update = add_update(transaction, refname);
- update->flags = flags;
- update->have_old = have_old;
- if (have_old) {
- assert(!is_null_sha1(old_sha1));
- hashcpy(update->old_sha1, old_sha1);
- }
- if (msg)
- update->msg = xstrdup(msg);
- return 0;
+int ref_transaction_verify(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *old_sha1,
+ unsigned int flags,
+ struct strbuf *err)
+{
+ if (!old_sha1)
+ die("BUG: verify called with old_sha1 set to NULL");
+ return ref_transaction_update(transaction, refname,
+ NULL, old_sha1,
+ flags, NULL, err);
}
-int update_ref(const char *action, const char *refname,
- const unsigned char *sha1, const unsigned char *oldval,
- int flags, enum action_on_err onerr)
+int update_ref(const char *msg, const char *refname,
+ const unsigned char *new_sha1, const unsigned char *old_sha1,
+ unsigned int flags, enum action_on_err onerr)
{
struct ref_transaction *t;
struct strbuf err = STRBUF_INIT;
t = ref_transaction_begin(&err);
if (!t ||
- ref_transaction_update(t, refname, sha1, oldval, flags,
- !!oldval, action, &err) ||
+ ref_transaction_update(t, refname, new_sha1, old_sha1,
+ flags, msg, &err) ||
ref_transaction_commit(t, &err)) {
const char *str = "update_ref failed for ref '%s': %s";
/* Acquire all locks while verifying old values */
for (i = 0; i < n; i++) {
struct ref_update *update = updates[i];
- int flags = update->flags;
+ unsigned int flags = update->flags;
- if (is_null_sha1(update->new_sha1))
+ if ((flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1))
flags |= REF_DELETING;
- update->lock = lock_ref_sha1_basic(update->refname,
- (update->have_old ?
- update->old_sha1 :
- NULL),
- NULL,
- flags,
- &update->type);
+ update->lock = lock_ref_sha1_basic(
+ update->refname,
+ ((update->flags & REF_HAVE_OLD) ?
+ update->old_sha1 : NULL),
+ NULL,
+ flags,
+ &update->type);
if (!update->lock) {
ret = (errno == ENOTDIR)
? TRANSACTION_NAME_CONFLICT
/* Perform updates first so live commits remain referenced */
for (i = 0; i < n; i++) {
struct ref_update *update = updates[i];
+ int flags = update->flags;
+
+ if ((flags & REF_HAVE_NEW) && !is_null_sha1(update->new_sha1)) {
+ int overwriting_symref = ((update->type & REF_ISSYMREF) &&
+ (update->flags & REF_NODEREF));
- if (!is_null_sha1(update->new_sha1)) {
- if (write_ref_sha1(update->lock, update->new_sha1,
- update->msg)) {
+ if (!overwriting_symref
+ && !hashcmp(update->lock->old_sha1, update->new_sha1)) {
+ /*
+ * The reference already has the desired
+ * value, so we don't need to write it.
+ */
+ unlock_ref(update->lock);
+ update->lock = NULL;
+ } else if (write_ref_sha1(update->lock, update->new_sha1,
+ update->msg)) {
update->lock = NULL; /* freed by write_ref_sha1 */
strbuf_addf(err, "Cannot update the ref '%s'.",
update->refname);
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
+ } else {
+ /* freed by write_ref_sha1(): */
+ update->lock = NULL;
}
- update->lock = NULL; /* freed by write_ref_sha1 */
}
}
/* Perform deletes now that updates are safely completed */
for (i = 0; i < n; i++) {
struct ref_update *update = updates[i];
+ int flags = update->flags;
- if (update->lock) {
+ if ((flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1)) {
if (delete_ref_loose(update->lock, update->type, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
}
- if (!(update->flags & REF_ISPRUNING))
+ if (!(flags & REF_ISPRUNING))
string_list_append(&refs_to_delete,
update->lock->ref_name);
}
}
return 0;
}
+
+struct expire_reflog_cb {
+ unsigned int flags;
+ reflog_expiry_should_prune_fn *should_prune_fn;
+ void *policy_cb;
+ FILE *newlog;
+ unsigned char last_kept_sha1[20];
+};
+
+static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
+ const char *email, unsigned long timestamp, int tz,
+ const char *message, void *cb_data)
+{
+ struct expire_reflog_cb *cb = cb_data;
+ struct expire_reflog_policy_cb *policy_cb = cb->policy_cb;
+
+ if (cb->flags & EXPIRE_REFLOGS_REWRITE)
+ osha1 = cb->last_kept_sha1;
+
+ if ((*cb->should_prune_fn)(osha1, nsha1, email, timestamp, tz,
+ message, policy_cb)) {
+ if (!cb->newlog)
+ printf("would prune %s", message);
+ else if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
+ printf("prune %s", message);
+ } else {
+ if (cb->newlog) {
+ fprintf(cb->newlog, "%s %s %s %lu %+05d\t%s",
+ sha1_to_hex(osha1), sha1_to_hex(nsha1),
+ email, timestamp, tz, message);
+ hashcpy(cb->last_kept_sha1, nsha1);
+ }
+ if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
+ printf("keep %s", message);
+ }
+ return 0;
+}
+
+int reflog_expire(const char *refname, const unsigned char *sha1,
+ unsigned int flags,
+ reflog_expiry_prepare_fn prepare_fn,
+ reflog_expiry_should_prune_fn should_prune_fn,
+ reflog_expiry_cleanup_fn cleanup_fn,
+ void *policy_cb_data)
+{
+ static struct lock_file reflog_lock;
+ struct expire_reflog_cb cb;
+ struct ref_lock *lock;
+ char *log_file;
+ int status = 0;
+ int type;
+
+ memset(&cb, 0, sizeof(cb));
+ cb.flags = flags;
+ cb.policy_cb = policy_cb_data;
+ cb.should_prune_fn = should_prune_fn;
+
+ /*
+ * The reflog file is locked by holding the lock on the
+ * reference itself, plus we might need to update the
+ * reference if --updateref was specified:
+ */
+ lock = lock_ref_sha1_basic(refname, sha1, NULL, 0, &type);
+ if (!lock)
+ return error("cannot lock ref '%s'", refname);
+ if (!reflog_exists(refname)) {
+ unlock_ref(lock);
+ return 0;
+ }
+
+ log_file = git_pathdup("logs/%s", refname);
+ if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
+ /*
+ * Even though holding $GIT_DIR/logs/$reflog.lock has
+ * no locking implications, we use the lock_file
+ * machinery here anyway because it does a lot of the
+ * work we need, including cleaning up if the program
+ * exits unexpectedly.
+ */
+ if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) {
+ struct strbuf err = STRBUF_INIT;
+ unable_to_lock_message(log_file, errno, &err);
+ error("%s", err.buf);
+ strbuf_release(&err);
+ goto failure;
+ }
+ cb.newlog = fdopen_lock_file(&reflog_lock, "w");
+ if (!cb.newlog) {
+ error("cannot fdopen %s (%s)",
+ reflog_lock.filename.buf, strerror(errno));
+ goto failure;
+ }
+ }
+
+ (*prepare_fn)(refname, sha1, cb.policy_cb);
+ for_each_reflog_ent(refname, expire_reflog_ent, &cb);
+ (*cleanup_fn)(cb.policy_cb);
+
+ if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
+ /*
+ * It doesn't make sense to adjust a reference pointed
+ * to by a symbolic ref based on expiring entries in
+ * the symbolic reference's reflog. Nor can we update
+ * a reference if there are no remaining reflog
+ * entries.
+ */
+ int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) &&
+ !(type & REF_ISSYMREF) &&
+ !is_null_sha1(cb.last_kept_sha1);
+
+ if (close_lock_file(&reflog_lock)) {
+ status |= error("couldn't write %s: %s", log_file,
+ strerror(errno));
+ } else if (update &&
+ (write_in_full(lock->lock_fd,
+ sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
+ write_str_in_full(lock->lock_fd, "\n") != 1 ||
+ close_ref(lock) < 0)) {
+ status |= error("couldn't write %s",
+ lock->lk->filename.buf);
+ rollback_lock_file(&reflog_lock);
+ } else if (commit_lock_file(&reflog_lock)) {
+ status |= error("unable to commit reflog '%s' (%s)",
+ log_file, strerror(errno));
+ } else if (update && commit_ref(lock)) {
+ status |= error("couldn't set %s", lock->ref_name);
+ }
+ }
+ free(log_file);
+ unlock_ref(lock);
+ return status;
+
+ failure:
+ rollback_lock_file(&reflog_lock);
+ free(log_file);
+ unlock_ref(lock);
+ return -1;
+}