$ git clone -n https://src.fedoraproject.org/rpms/perl-Mock-Sub.git /var/lib/mock/f45-build-24773-606/root/chroot_tmpdir/scmroot/perl-Mock-Sub
Cloning into '/var/lib/mock/f45-build-24773-606/root/chroot_tmpdir/scmroot/perl-Mock-Sub'...
$ git fetch origin ed8cd2ec85b4fed5c29d02fb08ab0188b5781590:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mock-Sub
 * [new ref]         ed8cd2ec85b4fed5c29d02fb08ab0188b5781590 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed8cd2e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild