$ git clone -n https://src.fedoraproject.org/rpms/rust-deranged.git /var/lib/mock/f40-build-2035865-48005/root/chroot_tmpdir/scmroot/rust-deranged
Cloning into '/var/lib/mock/f40-build-2035865-48005/root/chroot_tmpdir/scmroot/rust-deranged'...
$ git fetch origin 1c71fe73139fae2210926f0afae76f5162e26f20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-deranged
 * [new ref]         1c71fe73139fae2210926f0afae76f5162e26f20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c71fe7 Update to version 0.3.9; Fixes RHBZ#2244139