$ git clone -n https://src.fedoraproject.org/rpms/gst.git /var/lib/mock/f45-build-13088-446/root/chroot_tmpdir/scmroot/gst
Cloning into '/var/lib/mock/f45-build-13088-446/root/chroot_tmpdir/scmroot/gst'...
$ git fetch origin 01831a506fe3dbff22718746ec73dc741d4ce08a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gst
 * [new ref]         01831a506fe3dbff22718746ec73dc741d4ce08a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01831a5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild