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#!/usr/bin/env bash
set -e
set -x
function setup_root {
local _root="$1"
mkdir -p "$_root"
mount -t tmpfs tmpfs "$_root"
mkdir -p "$_root/etc" "$_root/run"
}
function check {
printf "Expected\n"
cat "$1"
printf "\nGot\n"
cat "$2"
cmp "$1" "$2"
}
r="$(pwd)/overwrite-broken-machine-id"
setup_root "$r"
systemd-machine-id-setup --print --root "$r"
echo abc >>"$r/etc/machine-id"
id=$(systemd-machine-id-setup --print --root "$r")
echo $id >expected
check expected "$r/etc/machine-id"
r="$(pwd)/transient-machine-id"
setup_root "$r"
systemd-machine-id-setup --print --root "$r"
echo abc >>"$r/etc/machine-id"
mount -o remount,ro "$r"
mount -t tmpfs tmpfs "$r/run"
transient_id=$(systemd-machine-id-setup --print --root "$r")
mount -o remount,rw "$r"
commited_id=$(systemd-machine-id-setup --print --commit --root "$r")
[[ "$transient_id" = "$commited_id" ]]
check "$r/etc/machine-id" "$r/run/machine-id"
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