$ git clone -n https://pagure.io/fedora-kiwi-descriptions.git /var/lib/mock/f41-kiwi-build-53804450-6461177/root/chroot_tmpdir/fedora-kiwi-descriptions
Cloning into '/var/lib/mock/f41-kiwi-build-53804450-6461177/root/chroot_tmpdir/fedora-kiwi-descriptions'...
$ git fetch origin 8caf9d87f861a68d62ec52098ef3f03392fb73df:KOJI_FETCH_HEAD
From https://pagure.io/fedora-kiwi-descriptions
 * [new ref]         8caf9d87f861a68d62ec52098ef3f03392fb73df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8caf9d8 components/boot: Add full kernel and btrfs stack to BootDiskCore