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#!/bin/bash
# Build OS monitor. It starts as a systemd service and performs the following
# steps:
#
# 1. Bootstrap the build2 toolchain.
# 2. Build and start bbot.
# 3. Build and start bslave.
# 4. Monitor for OS and toolchain changes and reboot if detected.
#
# @@ What do we do in case or error, trap? Send email? Reboot? Probably
# reboot bad idea since someone may need to login to examine what's
# going on.
#
# @@ What will systemd do if we fail? Perhaps configure it to restart
# us? Or not since we may hose the logs.
#
trap "exit 1" ERR
set -o errtrace # Trap in functions.
# Note: diagnostics goes to stdout.
#
function info () { echo "$*" 1>&2; }
function error ()
{
if [ "$#" -gt 0 ]; then
info "$*";
fi
exit 1
}
info "starting buildos monitor..."
# Parse the kernel command line. This is complicated by the fact that the
# values can be quoted, for example:
#
# foo='foo fox'
# bar="bar 'box'"
#
# First we separete quoted variables and arguments with newlines (giving
# priority to assignments). Then we replace whitespaces with newline on
# lines that don't contain quites. Finally, clean up by removing blank
# lines.
#
# Note: the same code as in init.
#
readarray -t cmdline < <(cat /proc/cmdline | \
sed -r -e "s/([^ ]+=)?('[^']*'|\"[^\"]*\")/\n\1\2\n/g" | \
sed -r -e "/['\"]/!s/ /\n/g" |
sed -r -e '/^\s*$/d')
# Enter all buildos variables as bash variables.
#
for v in "${cmdline[@]}"; do
var="$(sed -r -n -e 's/^buildos\.([^=]+)=.*$/\1/p' <<<"$v")" # Extract name.
if [ -n "$var" ]; then
val="$(sed -r -e 's/^[^=]+=(.*)$/\1/' <<<"$v")" # Extract value.
val="$(sed -r -e "s/^('(.*)'|\"(.*)\")$/\2\3/" <<<"$val")" # Strip quoted.
declare "$var=$val"
fi
done
hname="$(hostname)"
# Get the build id.
#
buildid="$(sed -n -re 's/^BUILD_ID="(.+)"$/\1/p' /etc/os-release)"
function email () # <subject> < <body>
{
(echo -e "Subject: [$hname] $1\n"; cat -) | sendmail -i "$admin_email"
}
function restart ()
{
sendmail -q # Flush mail queue.
sleep 10 # Give any remaining mail chance to go through.
sudo systemctl reboot
}
if [ -z "$buildid_url" ]; then
info "no buildos.buildid_url specified, not monitoring for new os builds"
fi
email "starting buildos monitor" <<EOF
buildid: $buildid
buildid_url: $buildid_url
EOF
while true; do
info "monitoring..."
sleep 5
if [ -n "$buildid_url" ]; then
# Fetch the current id. While normally it will be a TFTP URL, it could also
# be HTTP(S) so we configure sensible behavior for that.
#
if id="$(curl -f -L -s -S "$buildid_url")"; then
if [ "$id" != "$buildid" ]; then
email "rebooting because of new os build" <<EOF
old_buildid: $buildid
new_buildid: $id
EOF
info "new os build ($id), rebooting..."
restart
fi
else
info "unable to fetch $buildid_url, will try again"
fi
fi
done
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