$ git clone -n https://src.fedoraproject.org/rpms/rust-just.git /var/lib/mock/f40-build-800315-142896/root/chroot_tmpdir/scmroot/rust-just
Cloning into '/var/lib/mock/f40-build-800315-142896/root/chroot_tmpdir/scmroot/rust-just'...
$ git fetch origin 6a485ad47d5413edb8a72cd2db3854d3b6664d09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-just
 * [new ref]         6a485ad47d5413edb8a72cd2db3854d3b6664d09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a485ad Update to 1.25.2 (#2268524)