Re* git diff/log --check exitcode and PAGER environment variable

[Junio C Hamano <gitster@pobox.com>]

As this is not limited to diff command at all, let's do this instead.

-- >8 --
Document use of pager means you will see exit code from the pager

Whenever we run pager (either a subcommand that implies use of pager by
default, or by explicit request with "git -p cmd"), the main git process
becomes the upstream of the pipe that feed the pager, and the exit code
from the command as a whole comes from the pager.  Long time users may
have already got used to this without being documented, but it should be
documented.

We may be swapping the process ordering in the future so that the exit
code from the main git process is always exposed, and at that point this
comment should be removed.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 Documentation/git.txt |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/Documentation/git.txt b/Documentation/git.txt
index b1cb972..d6ca400 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -150,7 +150,9 @@ help ...`.
 
 -p::
 --paginate::
-	Pipe all output into 'less' (or if set, $PAGER).
+	Pipe all output into 'less' (or if set, $PAGER).  Note that this
+	implies that the exit code you see from the command will be that
+	of the pager, not git.
 
 --no-pager::
 	Do not pipe git output into a pager.