$ git clone -n https://src.fedoraproject.org/rpms/perl-YAML-PP-Ref.git /var/lib/mock/f45-build-27595-625/root/chroot_tmpdir/scmroot/perl-YAML-PP-Ref
Cloning into '/var/lib/mock/f45-build-27595-625/root/chroot_tmpdir/scmroot/perl-YAML-PP-Ref'...
$ git fetch origin 2c7e5b94301b472f4f35caab75125e4733f38c16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-YAML-PP-Ref
 * [new ref]         2c7e5b94301b472f4f35caab75125e4733f38c16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c7e5b9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild