$ git clone -n https://src.fedoraproject.org/rpms/rust-just.git /var/lib/mock/f40-build-774036-127565/root/chroot_tmpdir/scmroot/rust-just
Cloning into '/var/lib/mock/f40-build-774036-127565/root/chroot_tmpdir/scmroot/rust-just'...
$ git fetch origin 481dc2ddab49a044cb5fec2846da36331b106d04:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-just
 * [new ref]         481dc2ddab49a044cb5fec2846da36331b106d04 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 481dc2d Update to 1.23.0 (rhbz#2257345)