Some git tools such as GitExtensions for Windows use environment
variable TERM=msys which causes the weird ANSI sequence shown for the
messages returned from server-side hooks
We add those ANSI sequences to help format sideband data on the user's
terminal. However, GitExtensions is not using a terminal, and the ANSI
sequences just confuses it. We can recognize this use by checking
See for
more details

NOTE: I considered to cover the case that a pager has already been
started. But decided that is probably not worth worrying about here,
though, as we shouldn't be using a pager for commands that do network
communications (and if we do, omitting the magic line-clearing signal
is probably a sane thing to do).

Signed-off-by: Michael Naumov <>
Thanks-to: Erik Faye-Lund <>
Thanks-to: Jeff King <>
 sideband.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sideband.c b/sideband.c
index d1125f5..7f9dc22 100644
--- a/sideband.c
+++ b/sideband.c
@@ -30,7 +30,7 @@ int recv_sideband(const char *me, int in_stream, int out)
        memcpy(buf, PREFIX, pf);
        term = getenv("TERM");
-       if (term && strcmp(term, "dumb"))
+       if (isatty(2) && term && strcmp(term, "dumb"))
                suffix = ANSI_SUFFIX;
                suffix = DUMB_SUFFIX;

P.S. I gave up trying to send this letter from gmail, it eats my tab
P.S 2. Sorry, my tab character has been eaten again!
P.S 3. Wrapped the letter lines to fit on the terminal

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