$ git clone -n https://src.fedoraproject.org/rpms/rust-just.git /var/lib/mock/f41-build-810667-146879/root/chroot_tmpdir/scmroot/rust-just
Cloning into '/var/lib/mock/f41-build-810667-146879/root/chroot_tmpdir/scmroot/rust-just'...
$ git fetch origin 12123cd1162bd12cbb05602f63c9594dac35ce6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-just
 * [new ref]         12123cd1162bd12cbb05602f63c9594dac35ce6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12123cd Update to 1.27.0 (#2283189)