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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2016-03-14 22:37:44 +0000 |
|---|---|---|
| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2016-03-14 22:37:44 +0000 |
| commit | 99db04283debeb283fda1ae3dbb5d1c57218a2e9 (patch) | |
| tree | 685966e898e42584858d40c73550007f5659471c /doc/s6-linux-init-maker.html | |
| parent | 1e6f50c7c7f9202114be4e300807623ddbf77255 (diff) | |
| download | s6-linux-init-99db04283debeb283fda1ae3dbb5d1c57218a2e9.tar.xz | |
Document the -s option to s6-linux-init-maker
Diffstat (limited to 'doc/s6-linux-init-maker.html')
| -rw-r--r-- | doc/s6-linux-init-maker.html | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/doc/s6-linux-init-maker.html b/doc/s6-linux-init-maker.html index 95c0101..e2e0b2b 100644 --- a/doc/s6-linux-init-maker.html +++ b/doc/s6-linux-init-maker.html @@ -56,6 +56,7 @@ machine</em> - else the scripts will crash. [ -m <em>initial_umask</em> ] \ [ -t <em>timestamp_style</em> ] \ [ -d <em>dev_style</em> ] \ + [ -s <em>env_store</em> ] \ [ -e <em>initial_envvar</em> ] ... \ <em>dir</em> > <em>stage1</em> </pre> @@ -103,7 +104,7 @@ program launcher. </li> filesystem on <em>tmpfsdir</em>. </li> <li> <em>stage1</em> copies <tt><em>basedir</em>/run-image</tt> verbatim to <em>tmpfsdir</em>. </li> - <li> <em>stage1</em> reads a global set of environment variables from the + <li> <em>stage1</em> empties its environment, then reads a global set of environment variables from the <tt><em>basedir</em>/env</tt> <a href="http://skarnet.org/software/s6/s6-envdir.html">environment directory</a>. </li> <li> <em>stage1</em> forks a child that will block until @@ -313,6 +314,20 @@ devtmpfs but not automounted by the kernel at boot time, and 2 means devtmpfs automounted by the kernel at boot time. Default is <strong><tt>2</tt></strong>. </li> <p /> + <li> <tt>-s</tt> <em>env_store</em> : stage1 init sometimes +inherits a few environment variables from the kernel. It empties its +environment before spawning stage2 and executing into s6-svscan, in +order to prevent those "kernel" environment variables from leaking +into the whole process tree. However, sometimes those variables are +needed at a later time; in that case, giving the <tt>-s</tt> option +to s6-linux-init-maker makes stage1 init dump the "kernel" environment +variables into the <em>env_store</em> directory, via the +<a href="http://skarnet.org/software/s6-portable-utils/s6-dumpenv.html">s6-dumpenv</a> +program, before erasing them. <em>env_store</em> should obviously be +a writable directory, so it should be located under <em>tmpfsdir</em>! +If this option is not given (which is the default), the environment +inherited from the kernel isn't saved anywhere. </li> + <li> <tt>-e</tt> <em>initial_envvar</em> : this option can be repeated. For every <em>initial_envvar</em>, s6-linux-init-maker will adjust the global environment directory in <em>dir</em>/env. |