#include "../lockfile.h"
#include "../object.h"
#include "../dir.h"
+#include "../chdir-notify.h"
+
+/*
+ * This backend uses the following flags in `ref_update::flags` for
+ * internal bookkeeping purposes. Their numerical values must not
+ * conflict with REF_NO_DEREF, REF_FORCE_CREATE_REFLOG, REF_HAVE_NEW,
+ * REF_HAVE_OLD, or REF_IS_PRUNING, which are also stored in
+ * `ref_update::flags`.
+ */
+
+/*
+ * Used as a flag in ref_update::flags when a loose ref is being
+ * pruned. This flag must only be used when REF_NO_DEREF is set.
+ */
+#define REF_IS_PRUNING (1 << 4)
+
+/*
+ * 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 (1 << 5)
+
+/*
+ * Used as a flag in ref_update::flags when the lockfile needs to be
+ * committed.
+ */
+#define REF_NEEDS_COMMIT (1 << 6)
+
+/*
+ * Used as a flag in ref_update::flags when we want to log a ref
+ * update but not actually perform it. This is used when a symbolic
+ * ref update is split up.
+ */
+#define REF_LOG_ONLY (1 << 7)
+
+/*
+ * Used as a flag in ref_update::flags when the ref_update was via an
+ * update to HEAD.
+ */
+#define REF_UPDATE_VIA_HEAD (1 << 8)
+
+/*
+ * Used as a flag in ref_update::flags when the loose reference has
+ * been deleted.
+ */
+#define REF_DELETED_LOOSE (1 << 9)
struct ref_lock {
char *ref_name;
struct object_id old_oid;
};
-/*
- * Future: need to be in "struct repository"
- * when doing a full libification.
- */
struct files_ref_store {
struct ref_store base;
unsigned int store_flags;
refs->packed_ref_store = packed_ref_store_create(sb.buf, flags);
strbuf_release(&sb);
+ chdir_notify_reparent("files-backend $GIT_DIR",
+ &refs->gitdir);
+ chdir_notify_reparent("files-backend $GIT_COMMONDIR",
+ &refs->gitcommondir);
+
return ref_store;
}
if (refs->store_flags & REF_STORE_MAIN)
return;
- die("BUG: operation %s only allowed for main ref store", caller);
+ BUG("operation %s only allowed for main ref store", caller);
}
/*
struct files_ref_store *refs;
if (ref_store->be != &refs_be_files)
- die("BUG: ref_store is type \"%s\" not \"files\" in %s",
+ BUG("ref_store is type \"%s\" not \"files\" in %s",
ref_store->be->name, caller);
refs = (struct files_ref_store *)ref_store;
if ((refs->store_flags & required_flags) != required_flags)
- die("BUG: operation %s requires abilities 0x%x, but only have 0x%x",
+ BUG("operation %s requires abilities 0x%x, but only have 0x%x",
caller, required_flags, refs->store_flags);
return refs;
strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname);
break;
default:
- die("BUG: unknown ref type %d of ref %s",
+ BUG("unknown ref type %d of ref %s",
ref_type(refname), refname);
}
}
strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname);
break;
default:
- die("BUG: unknown ref type %d of ref %s",
+ BUG("unknown ref type %d of ref %s",
ref_type(refname), refname);
}
}
} else if (is_null_oid(&oid)) {
/*
* It is so astronomically unlikely
- * that NULL_SHA1 is the SHA-1 of an
+ * that null_oid is the OID of an
* actual object that we consider its
* appearance in a loose reference
* file to be repo corruption
* are passed to refs_verify_refname_available() for this check.
*
* If mustexist is not set and the reference is not found or is
- * broken, lock the reference anyway but clear sha1.
+ * broken, lock the reference anyway but clear old_oid.
*
* Return 0 on success. On failure, write an error message to err and
* return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
{
struct ref_transaction *transaction;
struct strbuf err = STRBUF_INIT;
+ int ret = -1;
if (check_refname_format(r->name, 0))
return;
transaction = ref_store_transaction_begin(&refs->base, &err);
- if (!transaction ||
- ref_transaction_delete(transaction, r->name, &r->oid,
- REF_ISPRUNING | REF_NODEREF, NULL, &err) ||
- ref_transaction_commit(transaction, &err)) {
- ref_transaction_free(transaction);
+ if (!transaction)
+ goto cleanup;
+ ref_transaction_add_update(
+ transaction, r->name,
+ REF_NO_DEREF | REF_HAVE_NEW | REF_HAVE_OLD | REF_IS_PRUNING,
+ &null_oid, &r->oid, NULL);
+ if (ref_transaction_commit(transaction, &err))
+ goto cleanup;
+
+ ret = 0;
+
+cleanup:
+ if (ret)
error("%s", err.buf);
- strbuf_release(&err);
- return;
- }
- ref_transaction_free(transaction);
strbuf_release(&err);
+ ref_transaction_free(transaction);
+ return;
}
/*
*/
if (ref_transaction_update(transaction, iter->refname,
iter->oid, NULL,
- REF_NODEREF, NULL, &err))
+ REF_NO_DEREF, NULL, &err))
die("failure preparing to create packed reference %s: %s",
iter->refname, err.buf);
}
if (!copy && refs_delete_ref(&refs->base, logmsg, oldrefname,
- &orig_oid, REF_NODEREF)) {
+ &orig_oid, REF_NO_DEREF)) {
error("unable to delete old %s", oldrefname);
goto rollback;
}
RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
&oid, NULL) &&
refs_delete_ref(&refs->base, NULL, newrefname,
- NULL, REF_NODEREF)) {
+ NULL, REF_NO_DEREF)) {
if (errno == EISDIR) {
struct strbuf path = STRBUF_INIT;
int result;
logmoved = log;
lock = lock_ref_oid_basic(refs, newrefname, NULL, NULL, NULL,
- REF_NODEREF, NULL, &err);
+ REF_NO_DEREF, NULL, &err);
if (!lock) {
if (copy)
error("unable to copy '%s' to '%s': %s", oldrefname, newrefname, err.buf);
rollback:
lock = lock_ref_oid_basic(refs, oldrefname, NULL, NULL, NULL,
- REF_NODEREF, NULL, &err);
+ REF_NO_DEREF, NULL, &err);
if (!lock) {
error("unable to lock %s for rollback: %s", oldrefname, err.buf);
strbuf_release(&err);
const struct object_id *new_oid,
const char *committer, const char *msg)
{
- int msglen, written;
- unsigned maxlen, len;
- char *logrec;
-
- msglen = msg ? strlen(msg) : 0;
- maxlen = strlen(committer) + msglen + 100;
- logrec = xmalloc(maxlen);
- len = xsnprintf(logrec, maxlen, "%s %s %s\n",
- oid_to_hex(old_oid),
- oid_to_hex(new_oid),
- committer);
- if (msglen)
- len += copy_reflog_msg(logrec + len - 1, msg) - 1;
-
- written = len <= maxlen ? write_in_full(fd, logrec, len) : -1;
- free(logrec);
- if (written < 0)
- return -1;
+ struct strbuf sb = STRBUF_INIT;
+ int ret = 0;
- return 0;
+ strbuf_addf(&sb, "%s %s %s", oid_to_hex(old_oid), oid_to_hex(new_oid), committer);
+ if (msg && *msg)
+ copy_reflog_msg(&sb, msg);
+ strbuf_addch(&sb, '\n');
+ if (write_in_full(fd, sb.buf, sb.len) < 0)
+ ret = -1;
+ strbuf_release(&sb);
+ return ret;
}
static int files_log_ref_write(struct files_ref_store *refs,
}
/*
- * Write sha1 into the open lockfile, then close the lockfile. On
- * errors, rollback the lockfile, fill in *err and
- * return -1.
+ * Write oid into the open lockfile, then close the lockfile. On
+ * errors, rollback the lockfile, fill in *err and return -1.
*/
static int write_ref_to_lockfile(struct ref_lock *lock,
const struct object_id *oid, struct strbuf *err)
struct object *o;
int fd;
- o = parse_object(oid);
+ o = parse_object(the_repository, oid);
if (!o) {
strbuf_addf(err,
"trying to write ref '%s' with nonexistent object %s",
return -1;
}
fd = get_lock_file_fd(&lock->lk);
- if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) < 0 ||
+ if (write_in_full(fd, oid_to_hex(oid), the_hash_algo->hexsz) < 0 ||
write_in_full(fd, &term, 1) < 0 ||
close_ref_gently(lock) < 0) {
strbuf_addf(err,
int ret;
lock = lock_ref_oid_basic(refs, refname, NULL,
- NULL, NULL, REF_NODEREF, NULL,
+ NULL, NULL, REF_NO_DEREF, NULL,
&err);
if (!lock) {
error("%s", err.buf);
}
if (!ret && sb.len)
- die("BUG: reverse reflog parser had leftover data");
+ BUG("reverse reflog parser had leftover data");
fclose(logfp);
strbuf_release(&sb);
static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator,
struct object_id *peeled)
{
- die("BUG: ref_iterator_peel() called for reflog_iterator");
+ BUG("ref_iterator_peel() called for reflog_iterator");
}
static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator)
struct ref_update *new_update;
if ((update->flags & REF_LOG_ONLY) ||
- (update->flags & REF_ISPRUNING) ||
+ (update->flags & REF_IS_PRUNING) ||
(update->flags & REF_UPDATE_VIA_HEAD))
return 0;
new_update = ref_transaction_add_update(
transaction, "HEAD",
- update->flags | REF_LOG_ONLY | REF_NODEREF,
+ update->flags | REF_LOG_ONLY | REF_NO_DEREF,
&update->new_oid, &update->old_oid,
update->msg);
/*
* update is for a symref that points at referent and doesn't have
- * REF_NODEREF set. Split it into two updates:
- * - The original update, but with REF_LOG_ONLY and REF_NODEREF set
+ * REF_NO_DEREF set. Split it into two updates:
+ * - The original update, but with REF_LOG_ONLY and REF_NO_DEREF set
* - A new, separate update for the referent reference
* Note that the new update will itself be subject to splitting when
* the iteration gets to it.
/*
* Change the symbolic ref update to log only. Also, it
- * doesn't need to check its old SHA-1 value, as that will be
+ * doesn't need to check its old OID value, as that will be
* done when new_update is processed.
*/
- update->flags |= REF_LOG_ONLY | REF_NODEREF;
+ update->flags |= REF_LOG_ONLY | REF_NO_DEREF;
update->flags &= ~REF_HAVE_OLD;
/*
* Prepare for carrying out update:
* - Lock the reference referred to by update.
* - Read the reference under lock.
- * - Check that its old SHA-1 value (if specified) is correct, and in
+ * - Check that its old OID value (if specified) is correct, and in
* any case record it in update->lock->old_oid for later use when
* writing the reflog.
- * - If it is a symref update without REF_NODEREF, split it up into a
+ * - If it is a symref update without REF_NO_DEREF, split it up into a
* REF_LOG_ONLY update of the symref and add a separate update for
* the referent to transaction.
* - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
update->backend_data = lock;
if (update->type & REF_ISSYMREF) {
- if (update->flags & REF_NODEREF) {
+ if (update->flags & REF_NO_DEREF) {
/*
* We won't be reading the referent as part of
* the transaction, so we have to read it here
- * to record and possibly check old_sha1:
+ * to record and possibly check old_oid:
*/
if (refs_read_ref_full(&refs->base,
referent.buf, 0,
/*
* Create a new update for the reference this
* symref is pointing at. Also, we will record
- * and verify old_sha1 for this update as part
+ * and verify old_oid for this update as part
* of processing the split-off update, so we
* don't have to do it here.
*/
/*
* If this update is happening indirectly because of a
- * symref update, record the old SHA-1 in the parent
+ * symref update, record the old OID in the parent
* update:
*/
for (parent_update = update->parent_update;
* transaction. (If we end up splitting up any updates using
* split_symref_update() or split_head_update(), those
* functions will check that the new updates don't have the
- * same refname as any existing ones.)
+ * same refname as any existing ones.) Also fail if any of the
+ * updates use REF_IS_PRUNING without REF_NO_DEREF.
*/
for (i = 0; i < transaction->nr; i++) {
struct ref_update *update = transaction->updates[i];
struct string_list_item *item =
string_list_append(&affected_refnames, update->refname);
+ if ((update->flags & REF_IS_PRUNING) &&
+ !(update->flags & REF_NO_DEREF))
+ BUG("REF_IS_PRUNING set without REF_NO_DEREF");
+
/*
* We store a pointer to update in item->util, but at
* the moment we never use the value of this field
ret = lock_ref_for_update(refs, update, transaction,
head_ref, &affected_refnames, err);
if (ret)
- break;
+ goto cleanup;
if (update->flags & REF_DELETING &&
!(update->flags & REF_LOG_ONLY) &&
- !(update->flags & REF_ISPRUNING)) {
+ !(update->flags & REF_IS_PRUNING)) {
/*
* This reference has to be deleted from
* packed-refs if it exists there.
ref_transaction_add_update(
packed_transaction, update->refname,
- update->flags & ~REF_HAVE_OLD,
- &update->new_oid, &update->old_oid,
+ REF_HAVE_NEW | REF_NO_DEREF,
+ &update->new_oid, NULL,
NULL);
}
}
goto cleanup;
}
backend_data->packed_refs_locked = 1;
- ret = ref_transaction_prepare(packed_transaction, err);
+
+ if (is_packed_transaction_needed(refs->packed_ref_store,
+ packed_transaction)) {
+ ret = ref_transaction_prepare(packed_transaction, err);
+ } else {
+ /*
+ * We can skip rewriting the `packed-refs`
+ * file. But we do need to leave it locked, so
+ * that somebody else doesn't pack a reference
+ * that we are trying to delete.
+ */
+ if (ref_transaction_abort(packed_transaction, err)) {
+ ret = TRANSACTION_GENERIC_ERROR;
+ goto cleanup;
+ }
+ backend_data->packed_transaction = NULL;
+ }
}
cleanup:
struct ref_update *update = transaction->updates[i];
if (update->flags & REF_DELETING &&
!(update->flags & REF_LOG_ONLY) &&
- !(update->flags & REF_ISPRUNING)) {
+ !(update->flags & REF_IS_PRUNING)) {
strbuf_reset(&sb);
files_reflog_path(refs, &sb, update->refname);
if (!unlink_or_warn(sb.buf))
assert(err);
if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: commit called for transaction that is not open");
+ BUG("commit called for transaction that is not open");
/* Fail if a refname appears more than once in the transaction: */
for (i = 0; i < transaction->nr; i++)
*/
if (refs_for_each_rawref(&refs->base, ref_present,
&affected_refnames))
- die("BUG: initial ref transaction called with existing refs");
+ BUG("initial ref transaction called with existing refs");
packed_transaction = ref_store_transaction_begin(refs->packed_ref_store, err);
if (!packed_transaction) {
if ((update->flags & REF_HAVE_OLD) &&
!is_null_oid(&update->old_oid))
- die("BUG: initial ref transaction with old_sha1 set");
+ BUG("initial ref transaction with old_sha1 set");
if (refs_verify_refname_available(&refs->base, update->refname,
&affected_refnames, NULL,
err)) {
if (initial_ref_transaction_commit(packed_transaction, err)) {
ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
}
+ packed_refs_unlock(refs->packed_ref_store);
cleanup:
if (packed_transaction)
ref_transaction_free(packed_transaction);
- packed_refs_unlock(refs->packed_ref_store);
transaction->state = REF_TRANSACTION_CLOSED;
string_list_clear(&affected_refnames, 0);
return ret;
{
struct files_ref_store *refs =
files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire");
- static struct lock_file reflog_lock;
+ struct lock_file reflog_lock = LOCK_INIT;
struct expire_reflog_cb cb;
struct ref_lock *lock;
struct strbuf log_file_sb = STRBUF_INIT;
* reference if --updateref was specified:
*/
lock = lock_ref_oid_basic(refs, refname, oid,
- NULL, NULL, REF_NODEREF,
+ NULL, NULL, REF_NO_DEREF,
&type, &err);
if (!lock) {
error("cannot lock ref '%s': %s", refname, err.buf);
rollback_lock_file(&reflog_lock);
} else if (update &&
(write_in_full(get_lock_file_fd(&lock->lk),
- oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) < 0 ||
+ oid_to_hex(&cb.last_kept_oid), the_hash_algo->hexsz) < 0 ||
write_str_in_full(get_lock_file_fd(&lock->lk), "\n") < 0 ||
close_ref_gently(lock) < 0)) {
status |= error("couldn't write %s",