$ git clone -n https://src.fedoraproject.org/rpms/perl-Symbol-Util.git /var/lib/mock/f45-build-26371-617/root/chroot_tmpdir/scmroot/perl-Symbol-Util
Cloning into '/var/lib/mock/f45-build-26371-617/root/chroot_tmpdir/scmroot/perl-Symbol-Util'...
$ git fetch origin 7b1cd86aded3a5588e90324904ad7d33ff8779e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Symbol-Util
 * [new ref]         7b1cd86aded3a5588e90324904ad7d33ff8779e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b1cd86 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild