$ git clone -n https://src.fedoraproject.org/rpms/perl-Tie-RefHash-Weak.git /var/lib/mock/f45-build-27212-621/root/chroot_tmpdir/scmroot/perl-Tie-RefHash-Weak
Cloning into '/var/lib/mock/f45-build-27212-621/root/chroot_tmpdir/scmroot/perl-Tie-RefHash-Weak'...
$ git fetch origin 375037bbab1ed804c06b74d0426868955ecaa04f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tie-RefHash-Weak
 * [new ref]         375037bbab1ed804c06b74d0426868955ecaa04f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 375037b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild