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Relay SIGTERM from docker stop to the child processes of /start #102

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Relay SIGTERM from docker stop to the child processes of /start #102

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18 changes: 16 additions & 2 deletions stack/builder
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Original file line number Diff line number Diff line change
Expand Up @@ -82,12 +82,26 @@ cat > /start <<EOF
export HOME=/app
for file in $app_root/.profile.d/*; do source \$file; done
hash -r

# set up signal trapping so that a docker stop's signal will propagate
# this requires starting the process from the procfile in the background and issuing a wait
onexit() {
echo "SIGTERM received"
echo "sending SIGTERM to all processes"
children=\$(ps --ppid=\$\$ -o pid='')
kill -- \$children &> /dev/null
sleep 1
}
trap onexit SIGTERM

cd $app_root
if [[ -f Procfile ]]; then
ruby -e "require 'yaml';puts YAML.load_file('Procfile')['\$1']" | bash
\`ruby -e "require 'yaml';puts YAML.load_file('Procfile')['\$1']"\` &
else
ruby -e "require 'yaml';puts (YAML.load_file('.release')['default_process_types'] || {})['\$1']" | bash
\`ruby -e "require 'yaml';puts (YAML.load_file('.release')['default_process_types'] || {})['\$1']"\` &
fi
wait

EOF
chmod +x /start

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