</listitem>
</varlistentry>
+ <!-- This is not documented on purpose, because it is not clear if $NO_COLOR will become supported
+ widely enough. So let's provide support, but without advertising this.
+ <varlistentry id='no-color'>
+ <term><varname>$NO_COLOR</varname></term>
+
+ <listitem><para>If set (to any value), and <varname>$SYSTEMD_COLORS</varname> is not set, equivalent to
+ <option>SYSTEMD_COLORS=0</option>. See <ulink url="https://no-color.org/">no-color.org</ulink>.</para>
+ </listitem>
+ </varlistentry>
+ -->
+
<varlistentry id='urlify'>
<term><varname>$SYSTEMD_URLIFY</varname></term>
val = getenv_bool("SYSTEMD_COLORS");
if (val >= 0)
cached_colors_enabled = val;
+
+ else if (getenv("NO_COLOR"))
+ /* We only check for the presence of the variable; value is ignored. */
+ cached_colors_enabled = false;
+
else if (getpid_cached() == 1)
/* PID1 outputs to the console without holding it open all the time */
cached_colors_enabled = !getenv_terminal_is_dumb();
if (b >= 0)
return b;
+ if (getenv("NO_COLOR"))
+ return false;
+
if (getenv_for_pid(1, "TERM", &s) <= 0)
(void) proc_cmdline_get_key("TERM", 0, &s);