$ git clone -n https://src.fedoraproject.org/rpms/perl-Class-DBI-Pg.git /var/lib/mock/f45-build-22350-591/root/chroot_tmpdir/scmroot/perl-Class-DBI-Pg
Cloning into '/var/lib/mock/f45-build-22350-591/root/chroot_tmpdir/scmroot/perl-Class-DBI-Pg'...
$ git fetch origin 5da307d108cbe6d772ca966ff1661c06cebe9e81:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Class-DBI-Pg
 * [new ref]         5da307d108cbe6d772ca966ff1661c06cebe9e81 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5da307d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild