From: Jeff King <p...@peff.net>

An earlier patch downgraded "always" that comes via the ui.color
configuration variable to "auto", in order to work around an
unfortunate regression to "git add -i".

That "fix" however regressed other third-party tools that depend on
"git -c color.ui=always cmd" as the way to defeat any end-user
configuration and force coloured output from git subcommand, even
when the output does not go to a terminal.

It is a bit ugly to treat "-c color.ui=always" from the command line
differently from a definition that comes from on-disk configuration
files, but it is a moral equivalent of "--color=always" option given
to the subcommand from the command line, i.e. a signal that tells us
that the script writer knows what s/he is doing.  So let's take that
route to unbreak this case while defeating a (now declared to be)
misguided color.ui that is set to always in the configuration file.

NEEDS-SIGN-OFF-BY: Jeff King <p...@peff.net>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 color.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/color.c b/color.c
index 17e2713f96..5b06c76bdc 100644
--- a/color.c
+++ b/color.c
@@ -307,8 +307,21 @@ int git_config_colorbool(const char *var, const char 
*value)
        if (value) {
                if (!strcasecmp(value, "never"))
                        return 0;
-               if (!strcasecmp(value, "always"))
-                       return var ? GIT_COLOR_AUTO : 1;
+               if (!strcasecmp(value, "always")) {
+                       /*
+                        * Command-line options always respect "always".
+                        * Likewise for "-c" config on the command-line.
+                        */
+                       if (!var ||
+                           current_config_scope() == CONFIG_SCOPE_CMDLINE)
+                               return 1;
+
+                       /*
+                        * Otherwise, we're looking at on-disk config;
+                        * downgrade to auto.
+                        */
+                       return GIT_COLOR_AUTO;
+               }
                if (!strcasecmp(value, "auto"))
                        return GIT_COLOR_AUTO;
        }
-- 
2.15.0-rc1-151-g44fe2f342f

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