$ git clone -n https://src.fedoraproject.org/rpms/perl-Perl4-CoreLibs.git /var/lib/mock/f45-build-25814-613/root/chroot_tmpdir/scmroot/perl-Perl4-CoreLibs
Cloning into '/var/lib/mock/f45-build-25814-613/root/chroot_tmpdir/scmroot/perl-Perl4-CoreLibs'...
$ git fetch origin b79a098d2857bfd1224fd63f5356dccc3c3536f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Perl4-CoreLibs
 * [new ref]         b79a098d2857bfd1224fd63f5356dccc3c3536f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b79a098 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild