From 7734f77373a871ffb755a99b381fd93682052b8c Mon Sep 17 00:00:00 2001
From: Barry Scott <barry.scott@onelan.co.uk>
Date: Mon, 3 Oct 2011 11:50:09 +0100
Subject: [PATCH] man: for ExecStart= provide more details on env var
 substitution and how that turns into arguments.

For EnvironmentFile= explain that double quotes can be used
to protect whitespace.
---
 man/systemd.exec.xml    |  5 +++++
 man/systemd.service.xml | 36 ++++++++++++++++++++++--------------
 2 files changed, 27 insertions(+), 14 deletions(-)

diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index 609484b3..230c4a31 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -279,6 +279,11 @@
                                 assignments. Empty lines and lines
                                 starting with ; or # will be ignored,
                                 which may be used for commenting. The
+                                parser strips leading and
+                                trailing whitespace from the values
+                                of assignments, unless you use
+                                double quotes (").
+                                The
                                 argument passed should be an absolute
                                 file name, optionally prefixed with
                                 "-", which indicates that if the file
diff --git a/man/systemd.service.xml b/man/systemd.service.xml
index 4f110202..7b6f12d0 100644
--- a/man/systemd.service.xml
+++ b/man/systemd.service.xml
@@ -311,20 +311,28 @@
                                 main process of the daemon. The
                                 command line accepts % specifiers as
                                 described in
-                                <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. On
-                                top of that basic environment variable
-                                substitution is supported, where
-                                <literal>${FOO}</literal> is replaced
-                                by the string value of the environment
-                                variable of the same name. Also
-                                <literal>$FOO</literal> may appear as
-                                separate word on the command line in
-                                which case the variable is replaced by
-                                its value split at whitespaces. Note
-                                that the first argument (i.e. the
-                                binary to execute) may not be a
-                                variable, and must be a literal and
-                                absolute path name.</para></listitem>
+                                <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
+
+                                <para>On top of that basic environment
+                                variable substitution is
+                                supported. Use
+                                <literal>${FOO}</literal> as part of a
+                                word, or as word of its own on the
+                                command line, in which case it will be
+                                replaced by the value of the
+                                environment variable including all
+                                whitespace it contains, resulting in a
+                                single argument.  Use
+                                <literal>$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 no or more
+                                arguments. Note that the first
+                                argument (i.e. the program to execute)
+                                may not be a variable, and must be a
+                                literal and absolute path
+                                name.</para></listitem>
                         </varlistentry>
 
                         <varlistentry>
-- 
2.39.5