$ git clone -n https://src.fedoraproject.org/rpms/perl-Time-Moment.git /var/lib/mock/f41-build-816807-150442/root/chroot_tmpdir/scmroot/perl-Time-Moment
Cloning into '/var/lib/mock/f41-build-816807-150442/root/chroot_tmpdir/scmroot/perl-Time-Moment'...
$ git fetch origin c0a6996ddd0575036e7c5c20847e6e5c0c2ad256:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Time-Moment
 * [new ref]         c0a6996ddd0575036e7c5c20847e6e5c0c2ad256 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0a6996 Perl 5.40 rebuild