$ git clone -n https://src.fedoraproject.org/rpms/rust-anstream.git /var/lib/mock/f38-build-side-42-init-devel-688863-26789/root/chroot_tmpdir/scmroot/rust-anstream
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-688863-26789/root/chroot_tmpdir/scmroot/rust-anstream'...
$ git fetch origin f22b2f99b5808bae8b0a10052d953bc84a2595e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-anstream
 * [new ref]         f22b2f99b5808bae8b0a10052d953bc84a2595e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f22b2f9 Initial import (#2183204)