blog/archive/2013/11/11.rss

   1 <?xml version="1.0" encoding="ISO-8859-1"?>
   2 <rss version='2.0' xmlns:lj='http://www.livejournal.org/rss/lj/1.0/'>
   3         <channel>
   4                 <title>Petter Reinholdtsen - Entries from November 2013</title>
   5                 <description>Entries from November 2013</description>
   6                 <link>http://people.skolelinux.org/pere/blog/</link>
   7
   8
   9         <item>
  10                 <title>Debian init.d boot script example for rsyslog</title>
  11                 <link>http://people.skolelinux.org/pere/blog/Debian_init_d_boot_script_example_for_rsyslog.html</link>
  12                 <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Debian_init_d_boot_script_example_for_rsyslog.html</guid>
  13                 <pubDate>Sat, 2 Nov 2013 22:40:00 +0100</pubDate>
  14                 <description>&lt;p&gt;If one of the points of switching to a new init system in Debian is
  15 &lt;a href=&quot;http://thomas.goirand.fr/blog/?p=147&quot;&gt;to get rid of huge
  16 init.d scripts&lt;/a&gt;, I doubt we need to switch away from sysvinit and
  17 init.d scripts at all.  Here is an example init.d script, ie a rewrite
  18 of /etc/init.d/rsyslog:&lt;/p&gt;
  19
  20 &lt;p&gt;&lt;pre&gt;
  21 #!/lib/init/init-d-script
  22 ### BEGIN INIT INFO
  23 # Provides:          rsyslog
  24 # Required-Start:    $remote_fs $time
  25 # Required-Stop:     umountnfs $time
  26 # X-Stop-After:      sendsigs
  27 # Default-Start:     2 3 4 5
  28 # Default-Stop:      0 1 6
  29 # Short-Description: enhanced syslogd
  30 # Description:       Rsyslog is an enhanced multi-threaded syslogd.
  31 #                    It is quite compatible to stock sysklogd and can be
  32 #                    used as a drop-in replacement.
  33 ### END INIT INFO
  34 DESC=&quot;enhanced syslogd&quot;
  35 DAEMON=/usr/sbin/rsyslogd
  36 &lt;/pre&gt;&lt;/p&gt;
  37
  38 &lt;p&gt;Pretty minimalistic to me... For the record, the original sysv-rc
  39 script was 137 lines, and the above is just 15 lines, most of the meta
  40 info/comments.&lt;/p&gt;
  41
  42 &lt;p&gt;How to do this, you ask?  Well, one create a new script
  43 /lib/init/init-d-script looking something like this:
  44
  45 &lt;p&gt;&lt;pre&gt;
  46 #!/bin/sh
  47
  48 # Define LSB log_* functions.
  49 # Depend on lsb-base (&gt;= 3.2-14) to ensure that this file is present
  50 # and status_of_proc is working.
  51 . /lib/lsb/init-functions
  52
  53 #
  54 # Function that starts the daemon/service
  55
  56 #
  57 do_start()
  58 {
  59         # Return
  60         #   0 if daemon has been started
  61         #   1 if daemon was already running
  62         #   2 if daemon could not be started
  63         start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test &gt; /dev/null \
  64                 || return 1
  65         start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- \
  66                 $DAEMON_ARGS \
  67                 || return 2
  68         # Add code here, if necessary, that waits for the process to be ready
  69         # to handle requests from services started subsequently which depend
  70         # on this one.  As a last resort, sleep for some time.
  71 }
  72
  73 #
  74 # Function that stops the daemon/service
  75 #
  76 do_stop()
  77 {
  78         # Return
  79         #   0 if daemon has been stopped
  80         #   1 if daemon was already stopped
  81         #   2 if daemon could not be stopped
  82         #   other if a failure occurred
  83         start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
  84         RETVAL=&quot;$?&quot;
  85         [ &quot;$RETVAL&quot; = 2 ] &amp;&amp; return 2
  86         # Wait for children to finish too if this is a daemon that forks
  87         # and if the daemon is only ever run from this initscript.
  88         # If the above conditions are not satisfied then add some other code
  89         # that waits for the process to drop all resources that could be
  90         # needed by services started subsequently.  A last resort is to
  91         # sleep for some time.
  92         start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
  93         [ &quot;$?&quot; = 2 ] &amp;&amp; return 2
  94         # Many daemons don&#39;t delete their pidfiles when they exit.
  95         rm -f $PIDFILE
  96         return &quot;$RETVAL&quot;
  97 }
  98
  99 #
 100 # Function that sends a SIGHUP to the daemon/service
 101 #
 102 do_reload() {
 103         #
 104         # If the daemon can reload its configuration without
 105         # restarting (for example, when it is sent a SIGHUP),
 106         # then implement that here.
 107         #
 108         start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAME
 109         return 0
 110 }
 111
 112 SCRIPTNAME=$1
 113 scriptbasename=&quot;$(basename $1)&quot;
 114 echo &quot;SN: $scriptbasename&quot;
 115 if [ &quot;$scriptbasename&quot; != &quot;init-d-library&quot; ] ; then
 116     script=&quot;$1&quot;
 117     shift
 118     . $script
 119 else
 120     exit 0
 121 fi
 122
 123 NAME=$(basename $DAEMON)
 124 PIDFILE=/var/run/$NAME.pid
 125
 126 # Exit if the package is not installed
 127 #[ -x &quot;$DAEMON&quot; ] || exit 0
 128
 129 # Read configuration variable file if it is present
 130 [ -r /etc/default/$NAME ] &amp;&amp; . /etc/default/$NAME
 131
 132 # Load the VERBOSE setting and other rcS variables
 133 . /lib/init/vars.sh
 134
 135 case &quot;$1&quot; in
 136   start)
 137         [ &quot;$VERBOSE&quot; != no ] &amp;&amp; log_daemon_msg &quot;Starting $DESC&quot; &quot;$NAME&quot;
 138         do_start
 139         case &quot;$?&quot; in
 140                 0|1) [ &quot;$VERBOSE&quot; != no ] &amp;&amp; log_end_msg 0 ;;
 141                 2) [ &quot;$VERBOSE&quot; != no ] &amp;&amp; log_end_msg 1 ;;
 142         esac
 143         ;;
 144   stop)
 145         [ &quot;$VERBOSE&quot; != no ] &amp;&amp; log_daemon_msg &quot;Stopping $DESC&quot; &quot;$NAME&quot;
 146         do_stop
 147         case &quot;$?&quot; in
 148                 0|1) [ &quot;$VERBOSE&quot; != no ] &amp;&amp; log_end_msg 0 ;;
 149                 2) [ &quot;$VERBOSE&quot; != no ] &amp;&amp; log_end_msg 1 ;;
 150         esac
 151         ;;
 152   status)
 153         status_of_proc &quot;$DAEMON&quot; &quot;$NAME&quot; &amp;&amp; exit 0 || exit $?
 154         ;;
 155   #reload|force-reload)
 156         #
 157         # If do_reload() is not implemented then leave this commented out
 158         # and leave &#39;force-reload&#39; as an alias for &#39;restart&#39;.
 159         #
 160         #log_daemon_msg &quot;Reloading $DESC&quot; &quot;$NAME&quot;
 161         #do_reload
 162         #log_end_msg $?
 163         #;;
 164   restart|force-reload)
 165         #
 166         # If the &quot;reload&quot; option is implemented then remove the
 167         # &#39;force-reload&#39; alias
 168         #
 169         log_daemon_msg &quot;Restarting $DESC&quot; &quot;$NAME&quot;
 170         do_stop
 171         case &quot;$?&quot; in
 172           0|1)
 173                 do_start
 174                 case &quot;$?&quot; in
 175                         0) log_end_msg 0 ;;
 176                         1) log_end_msg 1 ;; # Old process is still running
 177                         *) log_end_msg 1 ;; # Failed to start
 178                 esac
 179                 ;;
 180           *)
 181                 # Failed to stop
 182                 log_end_msg 1
 183                 ;;
 184         esac
 185         ;;
 186   *)
 187         echo &quot;Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}&quot; &gt;&amp;2
 188         exit 3
 189         ;;
 190 esac
 191
 192 :
 193 &lt;/pre&gt;&lt;/p&gt;
 194
 195 &lt;p&gt;It is based on /etc/init.d/skeleton, and could be improved quite a
 196 lot.  I did not really polish the approach, so it might not always
 197 work out of the box, but you get the idea.  I did not try very hard to
 198 optimize it nor make it more robust either.&lt;/p&gt;
 199
 200 &lt;p&gt;A better argument for switching init system in Debian than reducing
 201 the size of init scripts (which is a good thing to do anyway), is to
 202 get boot system that is able to handle the kernel events sensibly and
 203 robustly, and do not depend on the boot to run sequentially.  The boot
 204 and the kernel have not behaved sequentially in year.&lt;/p&gt;
 205 </description>
 206         </item>
 207
 208         <item>
 209                 <title>Browser plugin for SPICE (spice-xpi) uploaded to Debian</title>
 210                 <link>http://people.skolelinux.org/pere/blog/Browser_plugin_for_SPICE__spice_xpi__uploaded_to_Debian.html</link>
 211                 <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Browser_plugin_for_SPICE__spice_xpi__uploaded_to_Debian.html</guid>
 212                 <pubDate>Fri, 1 Nov 2013 11:00:00 +0100</pubDate>
 213                 <description>&lt;p&gt;&lt;a href=&quot;http://www.spice-space.org/&quot;&gt;The SPICE protocol&lt;/a&gt; for
 214 remote display access is the preferred solution with oVirt and RedHat
 215 Enterprise Virtualization, and I was sad to discover the other day
 216 that the browser plugin needed to use these systems seamlessly was
 217 missing in Debian.  The &lt;a href=&quot;http://bugs.debian.org/668284&quot;&gt;request
 218 for a package&lt;/a&gt; was from 2012-04-10 with no progress since
 219 2013-04-01, so I decided to wrap up a package based on the great work
 220 from Cajus Pollmeier and put it in a collab-maint maintained git
 221 repository to get a package I could use.  I would very much like
 222 others to help me maintain the package (or just take over, I do not
 223 mind), but as no-one had volunteered so far, I just uploaded it to
 224 NEW.  I hope it will be available in Debian in a few days.&lt;/p&gt;
 225
 226 &lt;p&gt;The source is now available from
 227 &lt;a href=&quot;http://anonscm.debian.org/gitweb/?p=collab-maint/spice-xpi.git;a=summary&quot;&gt;http://anonscm.debian.org/gitweb/?p=collab-maint/spice-xpi.git;a=summary&lt;/a&gt;.&lt;/p&gt;
 228 </description>
 229         </item>
 230
 231         </channel>
 232 </rss>