$ git clone -n https://src.fedoraproject.org/rpms/perl-HTML-Prototype.git /var/lib/mock/f40-build-2229439-53147/root/chroot_tmpdir/scmroot/perl-HTML-Prototype
Cloning into '/var/lib/mock/f40-build-2229439-53147/root/chroot_tmpdir/scmroot/perl-HTML-Prototype'...
$ git fetch origin 3d93421e43877c66b8a1dab985a3ed65589c786b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTML-Prototype
 * [new ref]         3d93421e43877c66b8a1dab985a3ed65589c786b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d93421 Orphaned for 6+ weeks