The NO_COLOR environment variable is a widely supported way for users
to disable coloured text output. See <https://no-color.org/>. In
case iproute2 is configured to use colours by default, allow this to
be overridden by setting NO_COLOR.
This is done in default_color_opt() so that colours can still be
explicitly enabled with a command-line option.
Signed-off-by: Ben Hutchings <benh@debian.org>
---
lib/color.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/lib/color.c b/lib/color.c
index 5c4cc329..3c6db08d 100644
--- a/lib/color.c
+++ b/lib/color.c
@@ -83,6 +83,13 @@ static void enable_color(void)
int default_color_opt(void)
{
+ const char *no_color;
+
+ /* If NO_COLOR has a non-empty value, coloured output is never wanted */
+ no_color = getenv("NO_COLOR");
+ if (no_color && *no_color)
+ return COLOR_OPT_NEVER;
+
return CONF_COLOR;
}
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