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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2015-12-19 20:19:38 +0000 |
|---|---|---|
| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2015-12-19 20:19:38 +0000 |
| commit | 384fa7f25cb8e9d759d8aaa681aa98e57d60dfac (patch) | |
| tree | ce132c1a5c6f88cd67c59733bc6bcbbc22e735f5 /doc/s6-envuidgid.html | |
| parent | d6807910974eb20f8cab8f1d77797de2701cb475 (diff) | |
| download | s6-384fa7f25cb8e9d759d8aaa681aa98e57d60dfac.tar.xz | |
Update doc for s6-envuidgid
Diffstat (limited to 'doc/s6-envuidgid.html')
| -rw-r--r-- | doc/s6-envuidgid.html | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/doc/s6-envuidgid.html b/doc/s6-envuidgid.html index da860cd..fed033b 100644 --- a/doc/s6-envuidgid.html +++ b/doc/s6-envuidgid.html @@ -27,7 +27,7 @@ executes into another program. <h2> Interface </h2> <pre> - s6-envuidgid [ -u | -g | -B ] [ -n ] [ -i | -D <em>uid</em>:<em>gid</em> ] <em>account</em> <em>prog...</em> + s6-envuidgid [ -u | -g | -B ] [ -n ] [ -i | -D <em>uid</em>:<em>gid</em>:<em>gidlist</em> ] <em>account</em> <em>prog...</em> </pre> <ul> @@ -52,18 +52,20 @@ group name instead of a user name; the GID environment variable will be set to its numerical value, and the UID and GIDLIST variables will not be touched. </li> <li> <tt>-B</tt> : both user and group. <em>account</em> will be interpreted as <em>user<tt>:</tt>group</em>. The GIDLIST variable will not be -touched. If <em>user</em> exists, the UID variable will be set; if -<em>group</em> exists, the GID variable will be set. </li> +touched. If <em>user</em> does not exist, the UID variable will be set to 0 unless +a better default is provided with the <tt>-D</tt> option. +if <em>group</em> does not exist, the GID variable will be set to 0 unless a +better default is provided with the <tt>-D</tt> option. </li> <li> <tt>-n</tt> : numerical fallback. If <em>account</em> cannot be found in the user or group database, try to interpret the given values literally. For instance, <tt>s6-envuidgid -B root:42</tt> will fail if there's no group named <tt>42</tt> in the group database, but <tt>s6-envuidgid -nB root:42</tt> -will set UID to 0 and GID to 42. This option implies <tt>-B</tt>. </li> +will set UID to 0 and GID to 42. </li> <li> <tt>-i</tt> : insist. If <em>account</em> is unknown, exit 1 with an error message. This is the default. </li> - <li> <tt>-D <em>uid</em>:<em>gid</em></tt> : if <em>account</em> -is unknown, use <em>uid</em> and <em>gid</em> as the values for UID and GID. -This options implies <tt>-B</tt>. </li> + <li> <tt>-D <em>uid</em>:<em>gid</em>:<em>gidlist/em></tt> : if <em>account</em> +is unknown, use <em>uid</em>, <em>gid</em> and <em>gidlist</em> as the values for +UID and GID and GIDLIST. </li> </ul> <h2> Notes </h2> @@ -71,17 +73,13 @@ This options implies <tt>-B</tt>. </li> <ul> <li> s6-envuidgid without options behaves like <a href="http://cr.yp.to/daemontools/envuidgid.html">envuidgid</a>, except that -the exit code is 1 if <em>account</em> doesn't exist. </li> +the exit code is 1 if <em>account</em> doesn't exist, and it also exports +supplementary groups. </li> <li> s6-envuidgid is useful when running a program that must start as root but can drop its privileges later. Such a program can read its new uid/gid/groups info from the UID, GID and GIDLIST environment variables. Superservers such as <a href="http://skarnet.org/software/s6-networking/s6-tcpserver4.html">s6-tcpserver4</a> make use of this. </li> - <li> s6-envuidgid only sets GIDLIST when no option (or only <tt>-i</tt>) is -given. If s6-envuidgid risks defaulting to a given numerical value for -UID or GID, it will not interpret <em>account</em> as a complete account name -with uid, gid and supplementary group list; instead, it interprets it as an -arbitrary combination of user name and group name. </li> </ul> </body> |