$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Random-MT-Auto.git /var/lib/mock/f41-build-816756-150376/root/chroot_tmpdir/scmroot/perl-Math-Random-MT-Auto
Cloning into '/var/lib/mock/f41-build-816756-150376/root/chroot_tmpdir/scmroot/perl-Math-Random-MT-Auto'...
$ git fetch origin 14246705a0fb36083ab3109b83cfa8a129600bda:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Random-MT-Auto
 * [new ref]         14246705a0fb36083ab3109b83cfa8a129600bda -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1424670 Perl 5.40 rebuild