$ git clone -n https://src.fedoraproject.org/rpms/bzip2.git /var/lib/mock/f41-build-883933-16584/root/chroot_tmpdir/scmroot/bzip2
Cloning into '/var/lib/mock/f41-build-883933-16584/root/chroot_tmpdir/scmroot/bzip2'...
$ git fetch origin 2e5cf7a4576ad98fc2fec6fcd6f28fec4fd1ed2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bzip2
 * [new ref]         2e5cf7a4576ad98fc2fec6fcd6f28fec4fd1ed2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e5cf7a Eliminate use of obsolete %patchN syntax (#2283636)