$ git clone -n https://src.fedoraproject.org/rpms/rust-domain.git /var/lib/mock/f39-build-1543750-36584/root/chroot_tmpdir/scmroot/rust-domain
Cloning into '/var/lib/mock/f39-build-1543750-36584/root/chroot_tmpdir/scmroot/rust-domain'...
$ git fetch origin 4b04b46b4cddfa2106c67a2500a41e4cd8457b71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-domain
 * [new ref]         4b04b46b4cddfa2106c67a2500a41e4cd8457b71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b04b46 Update to version 0.8.1; Fixes RHBZ#2239479