$ git clone -n https://src.fedoraproject.org/rpms/perl-PAR-Packer.git /var/lib/mock/f45-build-25436-611/root/chroot_tmpdir/scmroot/perl-PAR-Packer
Cloning into '/var/lib/mock/f45-build-25436-611/root/chroot_tmpdir/scmroot/perl-PAR-Packer'...
$ git fetch origin ae0f0bb57b5e36bd111aec7d94122a49c898592f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PAR-Packer
 * [new ref]         ae0f0bb57b5e36bd111aec7d94122a49c898592f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae0f0bb Perl 5.44 rebuild