$ git clone -n https://src.fedoraproject.org/rpms/perl-YAML-PP.git /var/lib/mock/f45-build-27650-625/root/chroot_tmpdir/scmroot/perl-YAML-PP
Cloning into '/var/lib/mock/f45-build-27650-625/root/chroot_tmpdir/scmroot/perl-YAML-PP'...
$ git fetch origin 91931835f60ba9a216f5e4f9fbce72c227f87e22:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-YAML-PP
 * [new ref]         91931835f60ba9a216f5e4f9fbce72c227f87e22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9193183 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild