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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 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
}
email "starting buildos monitor" <<EOF
buildid: $buildid
buildid_url: $buildid_url
toolchain_url: $toolchain_url
EOF
if [ -z "$buildid_url" ]; then
info "no buildos.buildid_url specified, not monitoring for new os builds"
fi
if [ -z "$toolchain_url" ]; then
info "no buildos.toolchain_url specified, not bootstrapping"
else
# The toolchain "sums" file (a list of SHA sums and relative file names, as
# produced by shaNNNsum). The first entry should always be build2-toolchain
# tar archive itself (which we use to figure out the version). Blank lines
# and lines that start with '#' are ignored.
#
tc_url="$toolchain_url"
tc_file="$(sed -n -re 's%^.+/([^/]+)$%\1%p' <<<"$tc_url")"
tc_sum="$(sed -n -re 's%^.+\.([^.]+)$%\1%p' <<<"$tc_file")"
tc_root="/build/tftp"
tc_path="$tc_root/$tc_file"
tc_ver=
fi
# Calculate the file checksum using the shaNNNsum utility.
#
function tc_checksum () # <file>
{
"${tc_sum}sum" -b "$1" | sed -n -re 's/^([^ ]+) .+$/\1/p'
}
# Fetch a file from the sums file into $tc_root, verify its checksum, and make
# a predictable name (without version) symlink.
#
function tc_fetch () # <line>
{
local s p f u l
s="$(sed -n -re 's/^([^ ]+) .+$/\1/p' <<<"$1")" # Checksum.
p="$(sed -n -re 's/^[^ ]+ \*([^ ]+)$/\1/p' <<<"$1")" # File path (rel).
f="$(sed -n -re 's%^(.+/)?([^/]+)$%\2%p' <<<"$p")" # File name.
u="$(sed -n -re 's%^(.+)/[^/]+$%\1%p' <<<"$tc_url")/$p" # File URL.
if [ -z "$s" -o -z "$p" -o -z "$f" -o -z "$u" ]; then
info "invalid sum line '$1'"
return 1
fi
# Extract the version.
#
if [ -z "$tc_ver" ]; then
tc_ver="$(sed -n -re 's/build2-toolchain-(.+)\.tar.*/\1/p' <<<"$f")"
if [ -z "$tc_ver" ]; then
info "unable to extract toolchain version from '$f'"
return 1
fi
info "toolchain version is $tc_ver"
echo "$tc_ver" >"$tc_root/toolchain-version"
fi
# Derive a predictable name link.
#
l="$(sed -n -re "s/^(.+)-$tc_ver(.*)$/\1\2/p" <<<"$f")"
if [ -z "$l" ]; then
info "unable to derive predicatable name from '$f', '$tc_ver'"
return 1
fi
# Fetch the file.
#
info "fetching $u [$l]"
if ! curl -f -L -s -S -o "$tc_root/$f" "$u"; then
info "unable to fetch $u"
return 1
fi
# Verify the checksum.
#
info "verifying checksum for $f"
local n
n="$(tc_checksum "$tc_root/$f")"
if [ "$n" != "$s" ]; then
info "$tc_sum checksum mismatch for $u"
info " expected: $s"
info " calculated: $n"
return 1
fi
# Make the link.
#
ln -s "$f" "$tc_root/$l"
}
# Bootstrap the toolchain.
#
function tc_bootstrap ()
{
local l ls=()
# Fetch files according to the sums file. Skip empty line and those that
# start with '#'.
#
readarray -t ls < <(sed -e '/^\s*#/d;/^\s*$/d' "$tc_path")
for l in "${ls[@]}"; do
if ! tc_fetch "$l"; then
return 1 # Diagnostics has already been issued.
fi
done
}
# Monitoring loop.
#
while true; do
# Check for toolchain changes. If this is the first run, bootstrap it.
#
if [ -n "$tc_url" ]; then
# Fetch the toolchain sums either to $tc_path if this is the first time
# or to $tc_path.new if we are checking for changes.
#
if [ -e "$tc_path" ]; then
f="$tc_path.new"
else
f="$tc_path"
fi
if curl -f -L -s -S -o "$f" "$tc_url"; then
# Take care of change detection.
#
if [ "$f" != "$tc_path" ]; then
n="$(tc_checksum "$f")"
if [ "$tc_file_sum" != "$n" ]; then
email "rebooting because of new toolchain" <<EOF
old_toolchain: $tc_file_sum
new_toolchain: $n
EOF
info "new toolchain ($n), rebooting..."
restart
fi
else
# This is the first run, bootstrap the toolchain.
#
tc_file_sum="$(tc_checksum "$f")"
# If we fail, we simply wait for a new toolchain to be uploaded (or
# some manual intervention).
#
# Note that because of the pipe tc_bootstrap() will run in subshell
# and any variables it sets (like tc_ver) won't be visible to us.
#
info "bootstrapping toolchain..."
tc_bootstrap 2>&1 | tee "$tc_root/toolchain.log" 1>&2
if [ "${PIPESTATUS[0]}" -eq 0 ]; then
tc_ver="$(cat $tc_root/toolchain-version)"
s="bootstrapped toolchain $tc_ver"
else
s="failed to bootstrap toolchain, waiting for new version"
fi
email "$s" <<EOF
toolchain_log: tftp://$hname/toolchain.log
EOF
fi
else
info "unable to fetch $tc_url, will try again"
rm -f "$f"
fi
fi
# Check for OS changes.
#
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
info "monitoring..."
sleep 10
done
|
