From 0da0a63dba426aa351d733292df6ec41603b39b6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Thu, 18 Aug 2016 22:03:56 -0400
Subject: [PATCH] systemd: ignore lack of tty when checking whether colors
 should be enabled

When started by the kernel, we are connected to the console, and we'll set TERM
properly to some value in fixup_environment(). We'll then enable or disable
colors based on the value of $SYSTEMD_COLORS and $TERM.

When reexecuting, TERM should be already set, so we can use this value.
Effectively, behaviour is the same as before affd7ed1a was reverted, but instead
of reopening the console before configuring color output, we just ignore what
stdout is connected to and decide based on the variables only.

(cherry picked from commit 158fbf7661912adf0f42c93155499119811dde82)
---
 src/basic/terminal-util.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/basic/terminal-util.c b/src/basic/terminal-util.c
index df56d85317..47d31ad4d7 100644
--- a/src/basic/terminal-util.c
+++ b/src/basic/terminal-util.c
@@ -1191,12 +1191,9 @@ int open_terminal_in_namespace(pid_t pid, const char *name, int mode) {
         return receive_one_fd(pair[0], 0);
 }
 
-bool terminal_is_dumb(void) {
+static bool getenv_terminal_is_dumb(void) {
         const char *e;
 
-        if (!on_tty())
-                return true;
-
         e = getenv("TERM");
         if (!e)
                 return true;
@@ -1204,6 +1201,13 @@ bool terminal_is_dumb(void) {
         return streq(e, "dumb");
 }
 
+bool terminal_is_dumb(void) {
+        if (!on_tty())
+                return true;
+
+        return getenv_terminal_is_dumb();
+}
+
 bool colors_enabled(void) {
         static int enabled = -1;
 
@@ -1213,6 +1217,9 @@ bool colors_enabled(void) {
                 colors = getenv("SYSTEMD_COLORS");
                 if (colors)
                         enabled = parse_boolean(colors) != 0;
+                else if (getpid() == 1)
+                        /* PID1 outputs to the console without holding it open all the time */
+                        enabled = !getenv_terminal_is_dumb();
                 else
                         enabled = !terminal_is_dumb();
         }