$ git clone -n https://src.fedoraproject.org/rpms/fdkaac.git /var/lib/mock/f45-build-8801-396/root/chroot_tmpdir/scmroot/fdkaac
Cloning into '/var/lib/mock/f45-build-8801-396/root/chroot_tmpdir/scmroot/fdkaac'...
$ git fetch origin a5b9f4a766c34f1813d993be55b28c843a0cdc69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fdkaac
 * [new ref]         a5b9f4a766c34f1813d993be55b28c843a0cdc69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5b9f4a update to 1.0.9 (resolves rhbz#2510747)