blog/Upstart_or_sysvinit___as_init_d_scripts_see_it.html

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   6     <title>Petter Reinholdtsen: Upstart or sysvinit - as init.d scripts see it</title>
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  12  <h1>
  13      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  14
  15  </h1>
  16
  17 </div>
  18
  19
  20     <div class="entry">
  21       <div class="title">Upstart or sysvinit - as init.d scripts see it</div>
  22       <div class="date"> 6th June 2010</div>
  23       <div class="body"><p>If Debian is to migrate to upstart on Linux, I expect some init.d
  24 scripts to migrate (some of) their operations to upstart job while
  25 keeping the init.d for hurd and kfreebsd.  The packages with such
  26 needs will need a way to get their init.d scripts to behave
  27 differently when used with sysvinit and with upstart.  Because of
  28 this, I had a look at the environment variables set when a init.d
  29 script is running under upstart, and when it is not.</p>
  30
  31 <p>With upstart, I notice these environment variables are set when a
  32 script is started from rcS.d/ (ignoring some irrelevant ones like
  33 COLUMNS):</p>
  34
  35 <blockquote><pre>
  36 DEFAULT_RUNLEVEL=2
  37 previous=N
  38 PREVLEVEL=
  39 RUNLEVEL=
  40 runlevel=S
  41 UPSTART_EVENTS=startup
  42 UPSTART_INSTANCE=
  43 UPSTART_JOB=rc-sysinit
  44 </pre></blockquote>
  45
  46 <p>With sysvinit, these environment variables are set for the same
  47 script.</p>
  48
  49 <blockquote><pre>
  50 INIT_VERSION=sysvinit-2.88
  51 previous=N
  52 PREVLEVEL=N
  53 RUNLEVEL=S
  54 runlevel=S
  55 </pre></blockquote>
  56
  57 <p>The RUNLEVEL and PREVLEVEL environment variables passed on from
  58 sysvinit are not set by upstart.  Not sure if it is intentional or not
  59 to not be compatible with sysvinit in this regard.</p>
  60
  61 <p>For scripts needing to behave differently when upstart is used,
  62 looking for the UPSTART_JOB environment variable seem to be a good
  63 choice.</p>
  64 </div>
  65
  66       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem</a>, <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.</div>
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