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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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Upstart or sysvinit - as init.d scripts see it</div>
  24       <div class="date"> 6th June 2010</div>
  25       <div class="body"><p>If Debian is to migrate to upstart on Linux, I expect some init.d
  26 scripts to migrate (some of) their operations to upstart job while
  27 keeping the init.d for hurd and kfreebsd.  The packages with such
  28 needs will need a way to get their init.d scripts to behave
  29 differently when used with sysvinit and with upstart.  Because of
  30 this, I had a look at the environment variables set when a init.d
  31 script is running under upstart, and when it is not.</p>
  32
  33 <p>With upstart, I notice these environment variables are set when a
  34 script is started from rcS.d/ (ignoring some irrelevant ones like
  35 COLUMNS):</p>
  36
  37 <blockquote><pre>
  38 DEFAULT_RUNLEVEL=2
  39 previous=N
  40 PREVLEVEL=
  41 RUNLEVEL=
  42 runlevel=S
  43 UPSTART_EVENTS=startup
  44 UPSTART_INSTANCE=
  45 UPSTART_JOB=rc-sysinit
  46 </pre></blockquote>
  47
  48 <p>With sysvinit, these environment variables are set for the same
  49 script.</p>
  50
  51 <blockquote><pre>
  52 INIT_VERSION=sysvinit-2.88
  53 previous=N
  54 PREVLEVEL=N
  55 RUNLEVEL=S
  56 runlevel=S
  57 </pre></blockquote>
  58
  59 <p>The RUNLEVEL and PREVLEVEL environment variables passed on from
  60 sysvinit are not set by upstart.  Not sure if it is intentional or not
  61 to not be compatible with sysvinit in this regard.</p>
  62
  63 <p>For scripts needing to behave differently when upstart is used,
  64 looking for the UPSTART_JOB environment variable seem to be a good
  65 choice.</p>
  66 </div>
  67
  68       <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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