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| author | Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> | 2013-09-12 09:29:01 -0400 |
|---|---|---|
| committer | Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> | 2013-09-12 09:29:01 -0400 |
| commit | f4ae69117ba47e75ff89c7d847e180af9af7436a (patch) | |
| tree | 23a5e1875b85d9a226382106e1b8f6ce52dec02b | |
| parent | 39f0570d6ea01476dd82bbcae60f51f97f614cec (diff) | |
man: Add a note about what environment variables are available by default
| -rw-r--r-- | man/systemd.exec.xml | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml index 2c673a2a96..ff8b812ef4 100644 --- a/man/systemd.exec.xml +++ b/man/systemd.exec.xml @@ -76,6 +76,27 @@ configuration options are configured in the [Service], [Socket], [Mount], or [Swap] sections, depending on the unit type.</para> + + <para>Processes started by the system systemd instance + are executed in a clean environment in which only the + <varname>$PATH</varname> and <varname>$LANG</varname> + variables are set by default. In order to add + additional variables, see the + <varname>Environment=</varname> and + <varname>EnvironmentFile=</varname> options below. To + specify variables globally, see + <varname>DefaultEnvironment=</varname> in + <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> + or the kernel option + <varname>systemd.setenv=</varname> in + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>. Processes + started by the user systemd instances inherit all + environment variables from the user systemd instance, + and have <varname>$HOME</varname>, + <varname>$USER</varname>, + <varname>$XDG_RUNTIME_DIR</varname> defined, among + others. In addition, <varname>$MANAGERPID</varname> + contains the PID of the user systemd instance.</para> </refsect1> <refsect1> |