$ git clone -n https://src.fedoraproject.org/rpms/flac123.git /var/lib/mock/f40-build-1996458-44018/root/chroot_tmpdir/scmroot/flac123
Cloning into '/var/lib/mock/f40-build-1996458-44018/root/chroot_tmpdir/scmroot/flac123'...
$ git fetch origin e50857a72e5b136f88738aa91f34f595b38e5d21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flac123
 * [new ref]         e50857a72e5b136f88738aa91f34f595b38e5d21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e50857a No longer need C99 patch