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Ensure child processes are killed #364

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31 changes: 30 additions & 1 deletion lib/install/bin/webpack-dev-server.tt
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,15 @@ $stdout.sync = true
require "shellwords"
require "yaml"

def descendant_processes(base=nil)
return [] if base.nil?
descendants = Hash.new{|ht,k| ht[k]=[k]}
Hash[*`ps -eo pid,ppid`.scan(/\d+/).map{|x|x.to_i}].each{|pid,ppid|
descendants[ppid] << descendants[pid]
}
descendants[base].flatten - [base]
end

ENV["RAILS_ENV"] ||= "development"
RAILS_ENV = ENV["RAILS_ENV"]

Expand All @@ -30,6 +39,26 @@ end
newenv = { "NODE_PATH" => NODE_MODULES_PATH }
cmdline = [WEBPACK_BIN, "--progress", "--color", "--config", DEV_SERVER_CONFIG] + ARGV

# Trap term and int signals to ensure child processes are removed
Signal.trap("TERM") do
exit 1 if $webpacker_dev_server_pid.nil?
# Kill the subprocesses
descendant_processes($webpacker_dev_server_pid).each do |d|
Process.kill(9, d)
end
end

Signal.trap("INT") do
exit 1 if $webpacker_dev_server_pid.nil?
# Kill the subprocesses
descendant_processes($webpacker_dev_server_pid).each do |d|
Process.kill(9, d)
end
end

Dir.chdir(APP_PATH) do
exec newenv, *cmdline
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As it's currently using exec, the immediate "child" process takes over here. That would seem to make any handling of further processes a matter for that one (the real webpack-dev-server). Does that process not manifest the same problem if run directly?

$webpacker_dev_server_pid = spawn newenv, *cmdline
end

wait $webpacker_dev_server_pid
$webpacker_dev_server_pid = nil