[asterisk-dev] [Code Review] 3574: safe_asterisk: Cleanup and debian compatibility.

[wdoekes]

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https://reviewboard.asterisk.org/r/3574/
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Review request for Asterisk Developers and Tzafrir Cohen.


Bugs: ASTERISK-23492
    https://issues.asterisk.org/jira/browse/ASTERISK-23492


Repository: Asterisk


Description
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A couple of fixes to safe_asterisk.

In order of appearance:

* Drop the vim #modeline. It isn't used consistently (textwidth was exceeded)
  and anyone who setting tabspace to something other than 8 should be frowned upon.
  (If you want 4 spaces, use expandtab (et) and friends (sts, sw).

* The message() function outputted messages to the terminal where the process
  was initially started: that means that if you start it on terminal A, you kill it
  on B, you get a message about killing it on A again.
  Rewritten to output it to /dev/$TTY if that was set and suppressed otherwise.

* For compatibility with debian users who have been living with this:
  https://github.com/leifmadsen/asterisk/blob/master/debian/patches/safe_asterisk-config
  we allow TTY to be empty or 'no'.

* Consistent spacing: no space before ; and no space after the redirection operators.
  No blobs. Only tabs for indentation.

* If TTY is no (or empty), then redirect all output to /dev/null. This was a daemon
  process, remember?

* Add option to export ASTSAFE_FOREGROUND=1 from the init script that call this. This
  is for compatibility with this:
  https://github.com/leifmadsen/asterisk/blob/master/debian/patches/safe_asterisk-nobg
  Of course that will require a change to this:
  https://github.com/leifmadsen/asterisk/blob/master/debian/asterisk.init
  but that's beyond the scope of asterisk.
  (This is what ticket ASTERISK-23492 is about.)


Diffs
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  /branches/1.8/contrib/scripts/safe_asterisk 414808 

Diff: https://reviewboard.asterisk.org/r/3574/diff/


Testing
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I tested TTY=, TTY=no, TTY=9 and tested whether doing this on the asterisk.init script worked:

--- init.orig	2014-05-29 16:54:05.755379751 +0200
+++ /etc/init.d/asterisk	2014-05-29 16:42:20.622731338 +0200
@@ -151,11 +151,11 @@ case "$1" in
 			echo "$DESC is already running. Use restart."
 			exit 0
 		fi
-		export SAFE_AST_BACKGROUND=1
 		start-stop-daemon --start --group $GROUP --pidfile "$PIDFILE" \
 			$CHDIR_PARM \
 			--exec $REALDAEMON -- $PARAMS > /dev/null
 	else
+		export ASTSAFE_FOREGROUND=1
 		start-stop-daemon --start --group $GROUP \
 			--background --make-pidfile \
 			$CHDIR_PARM --pidfile "$ASTSAFE_PIDFILE" \


All changes should be backwards compatible, except for the people who expect crap on the
terminal they used to start safe_asterisk on.

I wanted to change the daemonization to make it fully detached (double fork), but that
would probably mess with someones (upstart?) fork-count expectations. So I left that
alone.


Thanks,

wdoekes

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