$ git clone -n https://src.fedoraproject.org/rpms/erlang-fast_tls.git /var/lib/mock/f41-build-811262-147307/root/chroot_tmpdir/scmroot/erlang-fast_tls
Cloning into '/var/lib/mock/f41-build-811262-147307/root/chroot_tmpdir/scmroot/erlang-fast_tls'...
$ git fetch origin 6596a8f0bd737abbc0fe2a8bf991f403ffb5f3e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-fast_tls
 * [new ref]         6596a8f0bd737abbc0fe2a8bf991f403ffb5f3e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6596a8f Rebuild with a fixed Erlang macros