Merge branch 'jk/t7006-sigpipe-tests-fix'

The function to cull a child process and determine the exit status
had two separate code paths for normal callers and callers in a
signal handler, and the latter did not yield correct value when the
child has caught a signal.  The handling of the exit status has
been unified for these two code paths.  An existing test with
flakiness has also been corrected.

* jk/t7006-sigpipe-tests-fix:
  t7006: simplify exit-code checks for sigpipe tests
  t7006: clean up SIGPIPE handling in trace2 tests
  run-command: unify signal and regular logic for wait_or_whine()

2 files changed, 23 insertions, 50 deletions

diff --git a/run-command.c b/run-command.c
index f40df01c77..1f58c17b6c 100644
--- a/run-command.c
+++ b/run-command.c
@@ -552,20 +552,17 @@ static int wait_or_whine(pid_t pid, const char *argv0, int in_signal)
 
 	while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
 		;	/* nothing */
-	if (in_signal) {
-		if (WIFEXITED(status))
-			code = WEXITSTATUS(status);
-		return code;
-	}
 
 	if (waiting < 0) {
 		failed_errno = errno;
-		error_errno("waitpid for %s failed", argv0);
+		if (!in_signal)
+			error_errno("waitpid for %s failed", argv0);
 	} else if (waiting != pid) {
-		error("waitpid is confused (%s)", argv0);
+		if (!in_signal)
+			error("waitpid is confused (%s)", argv0);
 	} else if (WIFSIGNALED(status)) {
 		code = WTERMSIG(status);
-		if (code != SIGINT && code != SIGQUIT && code != SIGPIPE)
+		if (!in_signal && code != SIGINT && code != SIGQUIT && code != SIGPIPE)
 			error("%s died of signal %d", argv0, code);
 		/*
 		 * This return value is chosen so that code & 0xff
@@ -576,10 +573,12 @@ static int wait_or_whine(pid_t pid, const char *argv0, int in_signal)
 	} else if (WIFEXITED(status)) {
 		code = WEXITSTATUS(status);
 	} else {
-		error("waitpid is confused (%s)", argv0);
+		if (!in_signal)
+			error("waitpid is confused (%s)", argv0);
 	}
 
-	clear_child_for_cleanup(pid);
+	if (!in_signal)
+		clear_child_for_cleanup(pid);
 
 	errno = failed_errno;
 	return code;
diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index 0e7cf75435..a87ef37803 100755
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -661,6 +661,13 @@ test_expect_success 'setup trace2' '
 	export GIT_TRACE2_BRIEF
 '
 
+test_expect_success 'setup large log output' '
+	perl -e "
+		print \"this is a long commit message\" x 50000
+	" >commit-msg &&
+	git commit --allow-empty -F commit-msg
+'
+
 test_expect_success TTY 'git returns SIGPIPE on early pager exit' '
 	test_when_finished "rm pager-used trace.normal" &&
 	test_config core.pager ">pager-used; head -n 1; exit 0" &&
@@ -670,7 +677,7 @@ test_expect_success TTY 'git returns SIGPIPE on early pager exit' '
 
 	if test_have_prereq !MINGW
 	then
-		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
+		{ test_terminal git log >/dev/null; OUT=$?; } &&
 		test_match_signal 13 "$OUT"
 	else
 		test_terminal git log
@@ -691,7 +698,7 @@ test_expect_success TTY 'git returns SIGPIPE on early pager non-zero exit' '
 
 	if test_have_prereq !MINGW
 	then
-		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
+		{ test_terminal git log >/dev/null; OUT=$?; } &&
 		test_match_signal 13 "$OUT"
 	else
 		test_terminal git log
@@ -710,13 +717,7 @@ test_expect_success TTY 'git discards pager non-zero exit without SIGPIPE' '
 	export GIT_TRACE2 &&
 	test_when_finished "unset GIT_TRACE2" &&
 
-	if test_have_prereq !MINGW
-	then
-		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
-		test "$OUT" -eq 0
-	else
-		test_terminal git log
-	fi &&
+	test_terminal git log &&
 
 	grep child_exit trace.normal >child-exits &&
 	test_line_count = 1 child-exits &&
@@ -724,41 +725,14 @@ test_expect_success TTY 'git discards pager non-zero exit without SIGPIPE' '
 	test_path_is_file pager-used
 '
 
-test_expect_success TTY 'git discards nonexisting pager without SIGPIPE' '
-	test_when_finished "rm pager-used trace.normal" &&
-	test_config core.pager "wc >pager-used; does-not-exist" &&
-	GIT_TRACE2="$(pwd)/trace.normal" &&
-	export GIT_TRACE2 &&
-	test_when_finished "unset GIT_TRACE2" &&
-
-	if test_have_prereq !MINGW
-	then
-		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
-		test "$OUT" -eq 0
-	else
-		test_terminal git log
-	fi &&
-
-	grep child_exit trace.normal >child-exits &&
-	test_line_count = 1 child-exits &&
-	grep " code:127 " child-exits &&
-	test_path_is_file pager-used
-'
-
-test_expect_success TTY 'git attempts to page to nonexisting pager command, gets SIGPIPE' '
+test_expect_success TTY 'git skips paging nonexisting command' '
 	test_when_finished "rm trace.normal" &&
 	test_config core.pager "does-not-exist" &&
 	GIT_TRACE2="$(pwd)/trace.normal" &&
 	export GIT_TRACE2 &&
 	test_when_finished "unset GIT_TRACE2" &&
 
-	if test_have_prereq !MINGW
-	then
-		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
-		test_match_signal 13 "$OUT"
-	else
-		test_terminal git log
-	fi &&
+	test_terminal git log &&
 
 	grep child_exit trace.normal >child-exits &&
 	test_line_count = 1 child-exits &&
@@ -767,14 +741,14 @@ test_expect_success TTY 'git attempts to page to nonexisting pager command, gets
 
 test_expect_success TTY 'git returns SIGPIPE on propagated signals from pager' '
 	test_when_finished "rm pager-used trace.normal" &&
-	test_config core.pager ">pager-used; test-tool sigchain" &&
+	test_config core.pager ">pager-used; exec test-tool sigchain" &&
 	GIT_TRACE2="$(pwd)/trace.normal" &&
 	export GIT_TRACE2 &&
 	test_when_finished "unset GIT_TRACE2" &&
 
 	if test_have_prereq !MINGW
 	then
-		OUT=$( ((test_terminal git log; echo $? 1>&3) | :) 3>&1 ) &&
+		{ test_terminal git log >/dev/null; OUT=$?; } &&
 		test_match_signal 13 "$OUT"
 	else
 		test_terminal git log