$ git clone -n https://src.fedoraproject.org/rpms/perl-MogileFS-Server.git /var/lib/mock/f45-build-24929-607/root/chroot_tmpdir/scmroot/perl-MogileFS-Server
Cloning into '/var/lib/mock/f45-build-24929-607/root/chroot_tmpdir/scmroot/perl-MogileFS-Server'...
$ git fetch origin 4eecc830a2fbdd00e865b49d45f40b921f3543a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-MogileFS-Server
 * [new ref]         4eecc830a2fbdd00e865b49d45f40b921f3543a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4eecc83 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild