$ git clone -n https://src.fedoraproject.org/rpms/perl-Mail-Procmail.git /var/lib/mock/f45-build-24620-605/root/chroot_tmpdir/scmroot/perl-Mail-Procmail
Cloning into '/var/lib/mock/f45-build-24620-605/root/chroot_tmpdir/scmroot/perl-Mail-Procmail'...
$ git fetch origin 6c0d3ebd80b2db9ffa26c84e3fbfc7f87708033d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mail-Procmail
 * [new ref]         6c0d3ebd80b2db9ffa26c84e3fbfc7f87708033d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c0d3eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild