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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.
#
owd="$(pwd)"
trap "{ cd '$owd'; 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.
#
# Map of toolchain names (as specified in buildos.<var>.<name>) to the
# corresponding bash variable prefix.
#
declare -A toolchains
toolchains["default"]=""
for v in "${cmdline[@]}"; do
var="$(sed -n -re 's/^buildos\.([^=]+)=.*$/\1/p' <<<"$v")" # Extract name.
if [ -n "$var" ]; then
val="$(sed -re 's/^[^=]+=(.*)$/\1/' <<<"$v")" # Extract value.
val="$(sed -re "s/^('(.*)'|\"(.*)\")$/\2\3/" <<<"$val")" # Strip quoted.
# If the variable contains a dot, then it is a toolchain variable.
#
if [[ "$var" == *.* ]]; then
tn="$(sed -re 's/^[^.]+\.(.+)$/\1/' <<<"$var")"
var="${tn}_$(sed -re 's/^([^.]+)\..+$/\1/' <<<"$var")"
toolchains["$tn"]="${tn}_"
fi
declare "$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
}
# Toolchain-related funtions.
#
# Return the value of one of the toolchain_* variables for this toolchain.
#
function tc_value () # <toolchain-prefix> <variable>
{
local n="${1}${2}"
echo "${!n}"
}
# Calculate the file checksum using the shaNNNsum utility.
#
function tc_checksum () # <toolchain-prefix> <file>
{
"$(tc_value "$1" toolchain_csum)sum" -b "$2" | \
sed -n -re 's/^([^ ]+) .+$/\1/p'
}
# Fetch a file from the sums file into $toolchain_root, verify its checksum,
# and make a predictable name (without version) symlink.
#
function tc_fetch () # <toolchain-prefix> <line>
{
local s p f u l tp tu tr tv
tp="$1"
tu="$(tc_value "$tp" toolchain_url)"
tr="$(tc_value "$tp" toolchain_root)"
s="$(sed -n -re 's/^([^ ]+) .+$/\1/p' <<<"$2")" # Checksum.
p="$(sed -n -re 's/^[^ ]+ \*([^ ]+)$/\1/p' <<<"$2")" # File path (relative).
f="$(sed -n -re 's%^(.+/)?([^/]+)$%\2%p' <<<"$p")" # File name.
u="$(sed -n -re 's%^(.+)/[^/]+$%\1%p' <<<"$tu")/$p" # File URL.
if [ -z "$s" -o -z "$p" -o -z "$f" -o -z "$u" ]; then
info "invalid sum line '$2'"
return 1
fi
# Extract the version.
#
tv="$(tc_value "$tp" toolchain_ver)"
if [ -z "$tv" ]; then
tv="$(sed -n -re 's/build2-toolchain-(.+)\.tar.*/\1/p' <<<"$f")"
if [ -z "$tv" ]; then
info "unable to extract toolchain version from '$f'"
return 1
fi
declare -g "${tp}toolchain_ver=$tv"
info "toolchain version $tv"
echo "$tv" >"$tr/version"
fi
# Derive a predictable name link.
#
l="$(sed -n -re "s/^(.+)-$tv(.*)$/\1\2/p" <<<"$f")"
if [ -z "$l" ]; then
info "unable to derive predicatable name from '$f' and '$tv'"
return 1
fi
# Fetch the file.
#
info "fetching $u [$l]"
if ! curl -f -L -s -S -o "$tr/$f" "$u"; then
info "unable to fetch $u"
return 1
fi
# Verify the checksum.
#
info "verifying checksum for $f"
local cs
cs="$(tc_checksum "$tp" "$tr/$f")"
if [ "$cs" != "$s" ]; then
info "checksum mismatch for $u"
info " expected: $s"
info " calculated: $cs"
return 1
fi
# Make the link.
#
ln -s "$f" "$tr/$l"
}
# Bootstrap the toolchain.
#
function tc_bootstrap () # <toolchain-name>
{
local tn="$1"
local tp="${toolchains["$tn"]}"
local tr="$(tc_value "$tp" toolchain_root)"
local tf="$(tc_value "$tp" toolchain_file)"
# Fetch files according to the sums file. Skip empty lines and those that
# start with '#'.
#
local l ls=()
readarray -t ls < <(sed -e '/^\s*#/d;/^\s*$/d' "$tr/$tf")
for l in "${ls[@]}"; do
if ! tc_fetch "$tp" "$l"; then
return 1 # Diagnostics has already been issued.
fi
done
local tv="$(tc_value "$tp" toolchain_ver)" # Should be set by tc_fetch().
local tt="$(tc_value "$tp" toolchain_trust)"
# Bootstrap in /tmp/toolchains/$tn/, install to /build/toolchains/$tn/.
#
local wd="/tmp/toolchains/$tn"
local id="/build/toolchains/$tn"
mkdir -p "$wd"
mkdir -p "$id"
local r=1
cd "$wd"
while true; do # The "breakout loop".
# Extract the toolchain.
#
if ! tar -xf "$tr/build2-toolchain.tar.xz"; then
info "unable to extract $tr/build2-toolchain.tar.xz"
break
fi
cd "build2-toolchain-$tv"
# Bootstrap, stage, and install using the provided build.sh script.
#
if ! ./build.sh --install-dir "$id" --trust "$tt" g++; then
info "failed to build $(pwd)"
break
fi
r=0
break
done
cd "$owd"
# Clean up.
#
rm -r "$wd"
return "$r"
}
# Print monitor configuration as email body.
#
function print ()
{
echo "buildid: $buildid"
echo "buildid_url: $buildid_url"
echo
for tn in "${!toolchains[@]}"; do
tp="${toolchains["$tn"]}"
tu="$(tc_value "$tp" toolchain_url)"
if [ -z "$tu" ]; then
continue
fi
tt="$(tc_value "$tp" toolchain_trust)"
echo "$tn.toolchain_url: $tu"
echo "$tn.toolchain_trust: $tt"
echo
done
}
print | email "starting buildos monitor"
if [ -z "$buildid_url" ]; then
info "no buildos.buildid_url specified, not monitoring for new os builds"
fi
tc=
for tn in "${!toolchains[@]}"; do
tp="${toolchains["$tn"]}"
tu="$(tc_value "$tp" toolchain_url)"
if [ -z "$tu" ]; then
continue
fi
tc="true"
# 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.
#
tf="$(sed -n -re 's%^.+/([^/]+)$%\1%p' <<<"$tu")"
declare "${tp}toolchain_file=$tf"
declare "${tp}toolchain_csum=$(sed -n -re 's%^.+\.([^.]+)$%\1%p' <<<"$tf")"
declare "${tp}toolchain_root=/build/tftp/toolchains/$tn"
declare "${tp}toolchain_ver="
# If buildos.toolchain_trust was not specified, set it to "no" so that
# we don't prompt if the repository happens to be signed.
#
if [ -z "$(tc_value "$tp" toolchain_trust)" ]; then
declare "${tp}toolchain_trust=no"
fi
done
if [ -z "$tc" ]; then
info "no buildos.toolchain_url specified, not bootstrapping"
fi
# Monitoring loop.
#
while true; do
# Check for toolchain changes. If this is the first run, bootstrap them.
#
for tn in "${!toolchains[@]}"; do
tp="${toolchains["$tn"]}"
tu="$(tc_value "$tp" toolchain_url)"
if [ -z "$tu" ]; then
continue
fi
tr="$(tc_value "$tp" toolchain_root)"
tf="$(tc_value "$tp" toolchain_file)"
p="$tr/$tf"
mkdir -p "$tr"
# Fetch the toolchain sums either to $p if this is the first time or to
# $p.new if we are checking for changes.
#
if [ -e "$p" ]; then
f="$p.new"
else
f="$p"
fi
if curl -f -L -s -S -o "$f" "$tu"; then
# Take care of change detection.
#
if [ "$f" != "$p" ]; then
ts="$(tc_value "$tp" toolchain_file_csum)"
cs="$(tc_checksum "$tp" "$f")"
if [ "$ts" != "$cs" ]; then
email "rebooting because of new $tn toolchain" <<EOF
old_checksum: $ts
new_checksum: $cs
EOF
info "new $tn toolchain ($cs), rebooting..."
restart
fi
else
# This is the first run, bootstrap the toolchain.
#
declare "${tp}toolchain_file_csum=$(tc_checksum "$tp" "$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 toolchain_ver) won't be visible to
# us.
#
info "bootstrapping $tn toolchain..."
tc_bootstrap "$tn" 2>&1 | tee "$tr/bootstrap.log" 1>&2
if [ "${PIPESTATUS[0]}" -eq 0 ]; then
v="$(cat $tr/version)"
declare "${tp}toolchain_ver=$v"
s="bootstrapped $tn toolchain $v"
else
s="failed to bootstrap $tn toolchain, waiting for new version"
fi
info "$s"
email "$s" <<EOF
$tn.bootstrap_log: tftp://$hname/toolchains/$tn/bootstrap.log
EOF
fi
else
info "unable to fetch $tu, will try again"
rm -f "$f"
fi
done
# 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
|
