Re: [PATCH 1/2] t/test-lib.sh: support Korn shell by converting GIT_EXIT_OK to GIT_EXIT_CODE

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

Brandon Casey <casey@nrlssc.navy.mil> writes:

> From: Brandon Casey <drafnel@gmail.com>
>
> Commit 6e7b5aaf introduced the concept of GIT_EXIT_OK as a way to indicate
> to die(), the exit handler, whether the exit was initiated by the test
> harness, or whether it was unexpected.  die() expects $? to contain the
> value passed to exit(), and when GIT_EXIT_OK is set, die() calls exit with
> the value in $?.  This works as expected when using the Bash shell.  For
> the Korn shell, $? has the value of the last executed statement _before_
> the call to exit.  If that statement completed successfully, then die()
> would incorrectly exit with a successful status when GIT_EXIT_OK is set.

That's somewhat unexpected, as I did not think this was an anomaly in
bash.  FWIW, dash seems to behave the same way.

    The environment in which the shell executes a trap on EXIT shall be
    identical to the environment immediately after the last command executed
    before the trap on EXIT was taken.

If the trap action was triggered because somebody called "exit 13", $? is
expected to contain that value, because that is the last command executed
before the trap on EXIT was taken, no?

> So, rather than relying on the behavior of Bash in order to get the exit
> code from $? inside die(), change GIT_EXIT_OK into GIT_EXIT_CODE, and set
> it to the code that we want to exit with.  This allows the test suite to
> be run with the Korn shell.

I wonder if the attached is a more clear and contained workaround for this
issue.

---
 t/test-lib.sh |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/t/test-lib.sh b/t/test-lib.sh
index f2ca536..c47a295 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -185,7 +185,14 @@ die () {
 	code=$?
 	if test -n "$GIT_EXIT_OK"
 	then
-		exit $code
+		# Korn does not update $? when "exit 47" triggers
+		# the EXIT trap.
+		if test $code = 0
+		then
+			exit 1
+		else
+			exit $code
+		fi
 	else
 		echo >&5 "FATAL: Unexpected exit with code $code"
 		exit 1