$ git clone -n https://src.fedoraproject.org/rpms/perl-PAR-Packer.git /var/lib/mock/f41-build-816529-150225/root/chroot_tmpdir/scmroot/perl-PAR-Packer
Cloning into '/var/lib/mock/f41-build-816529-150225/root/chroot_tmpdir/scmroot/perl-PAR-Packer'...
$ git fetch origin 36cc21cbe7c0e5ff0bd2920e7c5691d6be7daf68:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PAR-Packer
 * [new ref]         36cc21cbe7c0e5ff0bd2920e7c5691d6be7daf68 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36cc21c Perl 5.40 rebuild