gistfile1.txt

#!/bin/bash

BOOT_ID="fake-client-018"
MACHINE_ID="fake-machine-018"
VERSION="394.0.0"

# Fill in default values
: ${COREOS_RELEASE_APPID:="{e96281a6-d1af-4bde-9a0a-97b76e56dc57}"}
: ${SERVER:="https://public.update.core-os.net/v1/update/"}
: ${GROUP:="alpha"}
: ${OEM_ID:="diskless"}

fill_attrs() {
    echo -n "appid=\"${COREOS_RELEASE_APPID}\" "
    echo -n "oem=\"${OEM_ID}\" "
    echo -n "version=\"${VERSION}\" "
    echo -n "track=\"${GROUP}\" "
    echo -n "bootid=\"{${BOOT_ID}}\" "
    # other UUID's are surrounded by {} but not machineid
    echo -n "machineid=\"${MACHINE_ID}\" "
    echo -n "lang=\"en-US\" "
    echo -n "hardware_class=\"\" "
    echo -n "delta_okay=\"false\" "
}

BODY="<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<request protocol=\"3.0\" version=\"CoreOSUpdateEngine-0.1.0.0\" updaterversion=\"CoreOSUpdateEngine-0.1.0.0\" installsource=\"scheduler\" ismachine=\"1\">
<os version=\"Chateau\" platform=\"CoreOS\" sp=\"${VERSION}\"></os>
<app $(fill_attrs) >
<event eventtype=\"3\" eventresult=\"2\" previousversion=\"\"></event>
</app>
</request>"

echo Request: "${BODY}"

curl -H "text/xml" -X POST -d "${BODY}" "${SERVER}"