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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-01-09 22:23:32 -0500
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-01-09 22:23:42 -0500
commitc5b37953b7835562348d71ad5514faefa4cfb10b (patch)
tree2ffdf090e98f15df9937f6af698189e5c3991534 /man/systemd.service.xml
parenta2cc4a6c960c26f62c33c995bc648357d939bd68 (diff)
man: mention which variables will be expanded in ExecStart
Diffstat (limited to 'man/systemd.service.xml')
-rw-r--r--man/systemd.service.xml35
1 files changed, 23 insertions, 12 deletions
diff --git a/man/systemd.service.xml b/man/systemd.service.xml
index 98507f405f..d316ab5d2e 100644
--- a/man/systemd.service.xml
+++ b/man/systemd.service.xml
@@ -392,16 +392,32 @@
replaced by the value of the
environment variable including all
whitespace it contains, resulting in a
- single argument. Use
+ single argument. Use
<literal>$FOO</literal> as a separate
word on the command line, in which
case it will be replaced by the value
- of the environment variable split up
- at whitespace, resulting in zero or
- more arguments. To pass a literal dollar sign,
- use <literal>$$</literal>. Note that the first
- argument (i.e. the program to execute)
- may not be a variable.</para>
+ of the environment variable split at
+ whitespace, resulting in zero or more
+ arguments. To pass a literal dollar
+ sign, use <literal>$$</literal>.
+ Variables whose value is not known at
+ expansion time are treated as empty
+ strings. Note that the first argument
+ (i.e. the program to execute) may not
+ be a variable.</para>
+
+ <para>Variables to be used in this
+ fashion may be defined through
+ <varname>Environment=</varname> and
+ <varname>EnvironmentFile=</varname>.
+ In addition, variables listed in
+ section "Environment variables in
+ spawned processes" in
+ <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ which are considered "static
+ configuration" may used (this includes
+ e.g. <varname>$USER</varname>, but not
+ <varname>$TERM</varname>).</para>
<para>Optionally, if the absolute file
name is prefixed with
@@ -429,11 +445,6 @@
<programlisting>ExecStart=/bin/sh -c 'dmesg | tac'
</programlisting>
- <para>Only select environment variables that
- are set for executed commands. See
- <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
- </para>
-
<para>Example:</para>
<programlisting>ExecStart=/bin/echo one ; /bin/echo "two two"
</programlisting>