$ git clone -n https://src.fedoraproject.org/rpms/mod_perl.git /var/lib/mock/f41-build-816647-150311/root/chroot_tmpdir/scmroot/mod_perl
Cloning into '/var/lib/mock/f41-build-816647-150311/root/chroot_tmpdir/scmroot/mod_perl'...
$ git fetch origin fb550f3ee401dac6a4f9c68ae0f7dc7c4c30ad36:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mod_perl
 * [new ref]         fb550f3ee401dac6a4f9c68ae0f7dc7c4c30ad36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb550f3 Perl 5.40 rebuild