$ git clone -n https://src.fedoraproject.org/rpms/jpegoptim.git /var/lib/mock/f45-build-14428-459/root/chroot_tmpdir/scmroot/jpegoptim
Cloning into '/var/lib/mock/f45-build-14428-459/root/chroot_tmpdir/scmroot/jpegoptim'...
$ git fetch origin 294906cc67b5a099c189c8530d14ed2995b1c81d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jpegoptim
 * [new ref]         294906cc67b5a099c189c8530d14ed2995b1c81d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 294906c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild