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pager: properly log pager exit code when signalled 

When git invokes a pager that exits with non-zero the common case is
that we'll already return the correct SIGPIPE failure from git itself,
but the exit code logged in trace2 has always been incorrectly
reported[1]. Fix that and log the correct exit code in the logs.

Since this gives us something to test outside of our recently-added
tests needing a !MINGW prerequisite, let's refactor the test to run on
MINGW and actually check for SIGPIPE outside of MINGW.

The wait_or_whine() is only called with a true "in_signal" from from
finish_command_in_signal(), which in turn is only used in pager.c.

The "in_signal && !WIFEXITED(status)" case is not covered by
tests. Let's log the default -1 in that case for good measure.

1. The incorrect logging of the exit code in was seemingly copy/pasted
   into finish_command_in_signal() in ee4512ed48 (trace2: create new
   combined trace facility, 2019-02-22)

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2021-02-02 03:00:00 +01:00 committed by Junio C Hamano
parent 85db79a96e
commit be8fc53e36
2 changed files with 68 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
run-command.c
View File

@ -552,7 +552,9 @@ 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) {
return 0;
if (WIFEXITED(status))
code = WEXITSTATUS(status);
return code;
}
if (waiting < 0) {

82
t/t7006-pager.sh
View File

@ -656,9 +656,17 @@ test_expect_success TTY 'git tag with auto-columns ' '
test_cmp expect actual
'
test_expect_success 'setup trace2' '
GIT_TRACE2_BRIEF=1 &&
export GIT_TRACE2_BRIEF
'
test_expect_success TTY 'git returns SIGPIPE on early pager exit' '
test_when_finished "rm pager-used" &&
test_when_finished "rm pager-used trace.normal" &&
test_config core.pager ">pager-used; head -n 1; exit 0" &&
GIT_TRACE2="$(pwd)/trace.normal" &&
export GIT_TRACE2 &&
test_when_finished "unset GIT_TRACE2" &&
if test_have_prereq !MINGW
then
@ -667,12 +675,19 @@ test_expect_success TTY 'git returns SIGPIPE on early pager exit' '
else
test_terminal git log
fi &&
grep child_exit trace.normal >child-exits &&
test_line_count = 1 child-exits &&
grep " code:0 " child-exits &&
test_path_is_file pager-used
'
test_expect_success TTY 'git returns SIGPIPE on early pager non-zero exit' '
test_when_finished "rm pager-used" &&
test_when_finished "rm pager-used trace.normal" &&
test_config core.pager ">pager-used; head -n 1; exit 1" &&
GIT_TRACE2="$(pwd)/trace.normal" &&
export GIT_TRACE2 &&
test_when_finished "unset GIT_TRACE2" &&
if test_have_prereq !MINGW
then
@ -681,12 +696,19 @@ test_expect_success TTY 'git returns SIGPIPE on early pager non-zero exit' '
else
test_terminal git log
fi &&
grep child_exit trace.normal >child-exits &&
test_line_count = 1 child-exits &&
grep " code:1 " child-exits &&
test_path_is_file pager-used
'
test_expect_success TTY 'git discards pager non-zero exit without SIGPIPE' '
test_when_finished "rm pager-used" &&
test_when_finished "rm pager-used trace.normal" &&
test_config core.pager "wc >pager-used; exit 1" &&
GIT_TRACE2="$(pwd)/trace.normal" &&
export GIT_TRACE2 &&
test_when_finished "unset GIT_TRACE2" &&
if test_have_prereq !MINGW
then
@ -695,12 +717,19 @@ test_expect_success TTY 'git discards pager non-zero exit without SIGPIPE' '
else
test_terminal git log
fi &&
grep child_exit trace.normal >child-exits &&
test_line_count = 1 child-exits &&
grep " code:1 " child-exits &&
test_path_is_file pager-used
'
test_expect_success TTY 'git discards nonexisting pager without SIGPIPE' '
test_when_finished "rm pager-used" &&
test_when_finished "rm pager-used trace.normal" &&
test_config core.pager "wc >pager-used; does-not-exist" &&
GIT_TRACE2="$(pwd)/trace.normal" &&
export GIT_TRACE2 &&
test_when_finished "unset GIT_TRACE2" &&
if test_have_prereq !MINGW
then
@ -709,24 +738,19 @@ test_expect_success TTY 'git discards nonexisting pager without SIGPIPE' '
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_when_finished "rm trace.normal" &&
test_config core.pager "does-not-exist" &&
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_expect_success TTY 'git returns SIGPIPE on propagated signals from pager' '
test_when_finished "rm pager-used" &&
test_config core.pager ">pager-used; test-tool sigchain" &&
GIT_TRACE2="$(pwd)/trace.normal" &&
export GIT_TRACE2 &&
test_when_finished "unset GIT_TRACE2" &&
if test_have_prereq !MINGW
then
@ -735,6 +759,30 @@ test_expect_success TTY 'git returns SIGPIPE on propagated signals from pager' '
else
test_terminal git log
fi &&
grep child_exit trace.normal >child-exits &&
test_line_count = 1 child-exits &&
grep " code:-1 " child-exits
'
test_expect_success TTY 'git returns SIGPIPE on propagated signals from pager' '
test_when_finished "rm pager-used trace.normal" &&
test_config core.pager ">pager-used; test-tool sigchain" &&
GIT_TRACE2="$(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 &&
grep child_exit trace.normal >child-exits &&
test_line_count = 1 child-exits &&
grep " code:143 " child-exits &&
test_path_is_file pager-used
'