$ git clone -n https://src.fedoraproject.org/rpms/jpegoptim.git /var/lib/mock/f40-build-2241349-53661/root/chroot_tmpdir/scmroot/jpegoptim
Cloning into '/var/lib/mock/f40-build-2241349-53661/root/chroot_tmpdir/scmroot/jpegoptim'...
$ git fetch origin 1b52a788e88dc5cf401e5a82d984e8d3bdb92176:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jpegoptim
 * [new ref]         1b52a788e88dc5cf401e5a82d984e8d3bdb92176 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b52a78 jpegoptim: 1.5.5 release