$ git clone -n https://src.fedoraproject.org/rpms/perl-Tk-EntryCheck.git /var/lib/mock/f45-build-27118-621/root/chroot_tmpdir/scmroot/perl-Tk-EntryCheck
Cloning into '/var/lib/mock/f45-build-27118-621/root/chroot_tmpdir/scmroot/perl-Tk-EntryCheck'...
$ git fetch origin 6bc68ade65a46cf7f9e7718447d6992126f66778:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tk-EntryCheck
 * [new ref]         6bc68ade65a46cf7f9e7718447d6992126f66778 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6bc68ad Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild