Manually set a process title when using load

With bundler 1.11.2, the process name for rake tasks looked like this:

   $ bundle exec rake foo:bar

   $ ps ux | grep rake
    user         1758 62.2  2.4 385816 202032 pts/3   Sl+  16:16   0:04 ruby /usr/bin/rake foo:bar

On bundler 1.12.0, the process name changed:

   $ bundle exec rake foo:bar

   $ ps ux | grep rake
    user         1758 62.2  2.4 385816 202032 pts/3   Sl+  16:16   0:04 /usr/bin/rake

The change in behaviour is caused by bundler 1.12 using `load` (instead of `exec`) where
possible, and manually using `$0=` to set the command name. Unfortunately, that also alters
the process title visible with ps, and using Process.setproctitle can help reverse that

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/bundler/cli/exec.rb b/lib/bundler/cli/exec.rb
index f0ce450959..b02a610c21 100644
--- a/lib/bundler/cli/exec.rb
+++ b/lib/bundler/cli/exec.rb
@@ -63,6 +63,7 @@ module Bundler
       args.pop if args.last.is_a?(Hash)
       ARGV.replace(args)
       $0 = file
+      Process.setproctitle(process_title(file, *args))
       ui = Bundler.ui
       Bundler.ui = nil
       require "bundler/setup"
@@ -78,6 +79,14 @@ module Bundler
       abort "#{e.class}: #{e.message}\n  #{backtrace.join("\n  ")}"
     end
 
+    def process_title(file, *args)
+      if args.empty?
+        file
+      else
+        "#{file} #{args.join(" ")}".strip
+      end
+    end
+
     def ruby_shebang?(file)
       possibilities = [
         "#!/usr/bin/env ruby\n",