$ git clone -n https://src.fedoraproject.org/rpms/perl-YAML-PP-LibYAML.git /var/lib/mock/f45-build-27593-625/root/chroot_tmpdir/scmroot/perl-YAML-PP-LibYAML
Cloning into '/var/lib/mock/f45-build-27593-625/root/chroot_tmpdir/scmroot/perl-YAML-PP-LibYAML'...
$ git fetch origin 0a64ef64916e6c2a88011b99c3c635e98b070bbd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-YAML-PP-LibYAML
 * [new ref]         0a64ef64916e6c2a88011b99c3c635e98b070bbd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a64ef6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild