$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Cmd.git /var/lib/mock/f45-build-26560-618/root/chroot_tmpdir/scmroot/perl-Test-Cmd
Cloning into '/var/lib/mock/f45-build-26560-618/root/chroot_tmpdir/scmroot/perl-Test-Cmd'...
$ git fetch origin c554e8da3b2781d56a9110e55282a2d884cffebd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Cmd
 * [new ref]         c554e8da3b2781d56a9110e55282a2d884cffebd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c554e8d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild