$ git clone -n https://src.fedoraproject.org/rpms/rust-iri-string.git /var/lib/mock/f38-build-side-42-init-devel-1156693-30535/root/chroot_tmpdir/scmroot/rust-iri-string
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1156693-30535/root/chroot_tmpdir/scmroot/rust-iri-string'...
$ git fetch origin 31db12195be0630977714706ba986f4f3189afa7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-iri-string
 * [new ref]         31db12195be0630977714706ba986f4f3189afa7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31db121 Initial import (#2214427)