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/usr/lib/maas/maas-test-enlistment is in maas-rack-controller 2.4.0~beta2-6865-gec43e47e6-0ubuntu1.

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The actual contents of the file can be viewed below.

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#!/bin/bash -e

# Copyright 2017 Canonical Ltd.  This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).

# This script tests enlistment by requesting boot loader configuration from
# MAAS, then parsing it to look for cloud-config and metadata server URLs.
# This allows the user to sanity-check that enlisting nodes will be able
# to reach the MAAS server. In addition, validates that required boot loader
# binaries exist, and prints their sha256 sums.

TMPDIR="$(mktemp -d)"

function cleanup() {
    rm -rf "$TMPDIR"
}

trap cleanup EXIT

server=${1:-localhost}

PXE_CFG_URL="tftp://$server/pxelinux.cfg/default-amd64-generic"
curl -s "$PXE_CFG_URL" > "$TMPDIR/pxe-config"

echo ""
echo "===== BEGIN PXE CONFIG ====="
cat "$TMPDIR/pxe-config"
echo "===== END PXE CONFIG ====="

GRUB_CFG_URL="tftp://$server/grub/grub.cfg-default-amd64-generic"
curl -s "$GRUB_CFG_URL" > "$TMPDIR/grub-config"
echo ""
echo "===== BEGIN GRUB CONFIG ====="
cat "$TMPDIR/grub-config"
echo "===== END GRUB CONFIG ====="

CONFIG_URL=$(cat "$TMPDIR/pxe-config" \
    | grep '  APPEND.*cloud-config-url' \
    | tr ' ' '\n' \
    | grep cloud-config-url \
    | cut -f2- -d=)
echo ""
echo "Found cloud-config-url: $CONFIG_URL"
curl -s "$CONFIG_URL" > "$TMPDIR/enlist-config"

echo ""
echo "===== BEGIN ENLISTMENT CLOUD-CONFIG ====="
cat "$TMPDIR/enlist-config"
echo "===== END ENLISTMENT CLOUD-CONFIG ====="

METADATA_URL=$(cat "$TMPDIR/enlist-config" \
    | grep 'metadata_url: ' \
    | awk '{ print $2 }')
echo ""
echo "Found metadata URL: $METADATA_URL"


LOADERS="
    tftp://$server/pxelinux.0
    tftp://$server/chain.c32
    tftp://$server/ifcpu64.c32
    tftp://$server/ldlinux.c32
    tftp://$server/libcom32.c32
    tftp://$server/libutil.c32
    tftp://$server/bootx64.efi
    tftp://$server/grubx64.efi
    tftp://$server/grubaa64.efi
    tftp://$server/bootppc64.bin
"

set -o pipefail
echo ""
echo "===== BEGIN BOOT LOADER SHA256 SUMS ====="
for loader in $LOADERS; do
    loader_sha256=$(curl -sqf "$loader" | sha256sum | awk '{ print $1 }' || touch $TMPDIR/not-found)
    if [ -f $TMPDIR/not-found ]; then
        loader_sha256="[WARNING: file not found]"
        rm $TMPDIR/not-found
    fi
    printf "%40s\n%10s%s\n\n" "$loader" "" "$loader_sha256"
done
echo "===== END BOOT LOADER SHA256 SUMS ====="