$ git clone -n https://src.fedoraproject.org/rpms/rust-just.git /var/lib/mock/f40-build-781389-131566/root/chroot_tmpdir/scmroot/rust-just
Cloning into '/var/lib/mock/f40-build-781389-131566/root/chroot_tmpdir/scmroot/rust-just'...
$ git fetch origin eb3d3c6c5374a75f1d0077e6b1f73a7d8718232d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-just
 * [new ref]         eb3d3c6c5374a75f1d0077e6b1f73a7d8718232d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb3d3c6 Update to 1.24.0 (rhbz#2263788)