$ git clone -n https://src.fedoraproject.org/rpms/shake.git /var/lib/mock/f39-build-1834777-41914/root/chroot_tmpdir/scmroot/shake
Cloning into '/var/lib/mock/f39-build-1834777-41914/root/chroot_tmpdir/scmroot/shake'...
$ git fetch origin 1bb8c1726f00366c96ae25cbc683b23ff4d90b56:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shake
 * [new ref]         1bb8c1726f00366c96ae25cbc683b23ff4d90b56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1bb8c17 bump release