Use a named pipe for logging in upstart example

The ability to log directly to /dev/kmsg was removed in Ubuntu 14.04,
making the existing example config fail to perform any real logging.
Appending a pipe to the last `exec` within the `script` block gives
upstart an incorrect PID to work with, which can lead to various issues.

This uses a FIFO solution that logs to syslog at any permission level
and doesn't leave anything on the file system afterwards.

examples/upstart/manage-many/sidekiq.conf

@@ -62,9 +62,13 @@ end script
 pre-stop script
 # this script runs in /bin/sh by default
 # respawn as bash so we can source in rbenv
-exec /bin/bash <<EOT
-  # uncomment to use syslog for logging
-  # exec &> /dev/kmsg
+exec /bin/bash <<'EOT'
+  # Use a named pipe directed at logger for system logging.
+  fifopath = '/tmp/sidekiq-log-fifo'
+  mkfifo $fifopath
+  (logger -t sidekiq < $fifopath &)
+  exec > $fifopath
+  rm $fifopath
 
   export HOME=/home/apps
 
@@ -82,6 +86,6 @@ exec /bin/bash <<EOT
   logger -t sidekiq "Stopping process: $app-$index"
 
   cd $app
-  exec bundle exec sidekiqctl stop tmp/pids/${app}-${index}.pid
+  exec bundle exec sidekiqctl stop tmp/pids/${app}-${index}.pid 2> /dev/null
 EOT
 end script

examples/upstart/manage-one/sidekiq.conf

@@ -28,7 +28,8 @@ env HOME=/home/deploy
 respawn
 respawn limit 3 30
 
-# TERM is sent by sidekiqctl when stopping sidekiq.  Without declaring these as normal exit codes, it just respawns.
+# TERM is sent by sidekiqctl when stopping sidekiq. Without declaring these as
+# normal exit codes, it just respawns.
 normal exit 0 TERM
 
 instance $index
@@ -37,18 +38,22 @@ script
 # this script runs in /bin/sh by default
 # respawn as bash so we can source in rbenv
 exec /bin/bash <<'EOT'
-  # use syslog for logging
-  exec &> /dev/kmsg
+  # Use a named pipe directed at logger for system logging.
+  fifopath = '/tmp/sidekiq-log-fifo'
+  mkfifo $fifopath
+  (logger -t sidekiq < $fifopath &)
+  exec > $fifopath
+  rm $fifopath
 
   # pull in system rbenv
   source /etc/profile.d/rbenv.sh
-  # or 
+  # or
   # pull in user installed rbenv
   # export PATH="$HOME/.rbenv/bin:$PATH"
   # eval "$(rbenv init -)"
   # export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"
 
   cd /opt/theclymb/current
-  exec bin/sidekiq -i ${index} -e production
+  exec bin/sidekiq -i ${index} -e production 2> /dev/null
 EOT
 end script