$ git clone -n https://src.fedoraproject.org/rpms/opam.git /var/lib/mock/f41-build-846597-163131/root/chroot_tmpdir/scmroot/opam
Cloning into '/var/lib/mock/f41-build-846597-163131/root/chroot_tmpdir/scmroot/opam'...
$ git fetch origin 10fd1d9137c9bde84784975f636a000372c441de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/opam
 * [new ref]         10fd1d9137c9bde84784975f636a000372c441de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10fd1d9 Version 2.2.1