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git-commit-vandalism/t/t0212-trace2-event.sh
Josh Steadmon 3d3adaad91 trace2: teach Git to log environment variables 
Via trace2, Git can already log interesting config parameters (see the
trace2_cmd_list_config() function). However, this can grant an
incomplete picture because many config parameters also allow overrides
via environment variables.

To allow for more complete logs, we add a new trace2_cmd_list_env_vars()
function and supporting implementation, modeled after the pre-existing
config param logging implementation.

Signed-off-by: Josh Steadmon <steadmon@google.com>
Acked-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-03-23 13:14:53 -07:00

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#!/bin/sh
test_description='test trace2 facility'
. ./test-lib.sh
# Turn off any inherited trace2 settings for this test.
sane_unset GIT_TRACE2 GIT_TRACE2_PERF GIT_TRACE2_EVENT
sane_unset GIT_TRACE2_BARE
sane_unset GIT_TRACE2_CONFIG_PARAMS
perl -MJSON::PP -e 0 >/dev/null 2>&1 && test_set_prereq JSON_PP
# Add t/helper directory to PATH so that we can use a relative
# path to run nested instances of test-tool.exe (see 004child).
# This helps with HEREDOC comparisons later.
TTDIR="$GIT_BUILD_DIR/t/helper/" && export TTDIR
PATH="$TTDIR:$PATH" && export PATH
# Warning: use of 'test_cmp' may run test-tool.exe and/or git.exe
# Warning: to do the actual diff/comparison, so the HEREDOCs here
# Warning: only cover our actual calls to test-tool and/or git.
# Warning: So you may see extra lines in artifact files when
# Warning: interactively debugging.
V=$(git version | sed -e 's/^git version //') && export V
# There are multiple trace2 targets: normal, perf, and event.
# Trace2 events will/can be written to each active target (subject
# to whatever filtering that target decides to do).
# Test each target independently.
#
# Defer setting GIT_TRACE2_PERF until the actual command we want to
# test because hidden git and test-tool commands in the test
# harness can contaminate our output.
# We don't bother repeating the 001return and 002exit tests, since they
# have coverage in the normal and perf targets.
# Verb 003error
#
# To the above, add multiple 'error <msg>' events
test_expect_success JSON_PP 'event stream, error event' '
test_when_finished "rm trace.event actual expect" &&
GIT_TRACE2_EVENT="$(pwd)/trace.event" test-tool trace2 003error "hello world" "this is a test" &&
perl "$TEST_DIRECTORY/t0212/parse_events.perl" <trace.event >actual &&
sed -e "s/^|//" >expect <<-EOF &&
|VAR1 = {
| "_SID0_":{
| "argv":[
| "_EXE_",
| "trace2",
| "003error",
| "hello world",
| "this is a test"
| ],
| "errors":[
| "%s",
| "%s"
| ],
| "exit_code":0,
| "hierarchy":"trace2",
| "name":"trace2",
| "version":"$V"
| }
|};
EOF
test_cmp expect actual
'
# Verb 004child
#
# Test nested spawning of child processes.
#
# Conceptually, this looks like:
# P1: TT trace2 004child
# P2: |--- TT trace2 004child
# P3: |--- TT trace2 001return 0
test_expect_success JSON_PP 'event stream, return code 0' '
test_when_finished "rm trace.event actual expect" &&
GIT_TRACE2_EVENT="$(pwd)/trace.event" test-tool trace2 004child test-tool trace2 004child test-tool trace2 001return 0 &&
perl "$TEST_DIRECTORY/t0212/parse_events.perl" <trace.event >actual &&
sed -e "s/^|//" >expect <<-EOF &&
|VAR1 = {
| "_SID0_":{
| "argv":[
| "_EXE_",
| "trace2",
| "004child",
| "test-tool",
| "trace2",
| "004child",
| "test-tool",
| "trace2",
| "001return",
| "0"
| ],
| "child":{
| "0":{
| "child_argv":[
| "_EXE_",
| "trace2",
| "004child",
| "test-tool",
| "trace2",
| "001return",
| "0"
| ],
| "child_class":"?",
| "child_code":0,
| "use_shell":0
| }
| },
| "exit_code":0,
| "hierarchy":"trace2",
| "name":"trace2",
| "version":"$V"
| },
| "_SID0_/_SID1_":{
| "argv":[
| "_EXE_",
| "trace2",
| "004child",
| "test-tool",
| "trace2",
| "001return",
| "0"
| ],
| "child":{
| "0":{
| "child_argv":[
| "_EXE_",
| "trace2",
| "001return",
| "0"
| ],
| "child_class":"?",
| "child_code":0,
| "use_shell":0
| }
| },
| "exit_code":0,
| "hierarchy":"trace2/trace2",
| "name":"trace2",
| "version":"$V"
| },
| "_SID0_/_SID1_/_SID2_":{
| "argv":[
| "_EXE_",
| "trace2",
| "001return",
| "0"
| ],
| "exit_code":0,
| "hierarchy":"trace2/trace2/trace2",
| "name":"trace2",
| "version":"$V"
| }
|};
EOF
test_cmp expect actual
'
# Test listing of all "interesting" config settings.
test_expect_success JSON_PP 'event stream, list config' '
test_when_finished "rm trace.event actual expect" &&
git config --local t0212.abc 1 &&
git config --local t0212.def "hello world" &&
GIT_TRACE2_EVENT="$(pwd)/trace.event" GIT_TRACE2_CONFIG_PARAMS="t0212.*" test-tool trace2 001return 0 &&
perl "$TEST_DIRECTORY/t0212/parse_events.perl" <trace.event >actual &&
sed -e "s/^|//" >expect <<-EOF &&
|VAR1 = {
| "_SID0_":{
| "argv":[
| "_EXE_",
| "trace2",
| "001return",
| "0"
| ],
| "exit_code":0,
| "hierarchy":"trace2",
| "name":"trace2",
| "params":[
| {
| "param":"t0212.abc",
| "value":"1"
| },
| {
| "param":"t0212.def",
| "value":"hello world"
| }
| ],
| "version":"$V"
| }
|};
EOF
test_cmp expect actual
'
# Test listing of all "interesting" environment variables.
test_expect_success JSON_PP 'event stream, list env vars' '
test_when_finished "rm trace.event actual expect" &&
GIT_TRACE2_EVENT="$(pwd)/trace.event" \
GIT_TRACE2_ENV_VARS="A_VAR,OTHER_VAR,MISSING" \
A_VAR=1 OTHER_VAR="hello world" test-tool trace2 001return 0 &&
perl "$TEST_DIRECTORY/t0212/parse_events.perl" <trace.event >actual &&
sed -e "s/^|//" >expect <<-EOF &&
|VAR1 = {
| "_SID0_":{
| "argv":[
| "_EXE_",
| "trace2",
| "001return",
| "0"
| ],
| "exit_code":0,
| "hierarchy":"trace2",
| "name":"trace2",
| "params":[
| {
| "param":"A_VAR",
| "value":"1"
| },
| {
| "param":"OTHER_VAR",
| "value":"hello world"
| }
| ],
| "version":"$V"
| }
|};
EOF
test_cmp expect actual
'
test_expect_success JSON_PP 'basic trace2_data' '
test_when_finished "rm trace.event actual expect" &&
GIT_TRACE2_EVENT="$(pwd)/trace.event" test-tool trace2 006data test_category k1 v1 test_category k2 v2 &&
perl "$TEST_DIRECTORY/t0212/parse_events.perl" <trace.event >actual &&
sed -e "s/^|//" >expect <<-EOF &&
|VAR1 = {
| "_SID0_":{
| "argv":[
| "_EXE_",
| "trace2",
| "006data",
| "test_category",
| "k1",
| "v1",
| "test_category",
| "k2",
| "v2"
| ],
| "data":{
| "test_category":{
| "k1":"v1",
| "k2":"v2"
| }
| },
| "exit_code":0,
| "hierarchy":"trace2",
| "name":"trace2",
| "version":"$V"
| }
|};
EOF
test_cmp expect actual
'
# Now test without environment variables and get all Trace2 settings
# from the global config.
test_expect_success JSON_PP 'using global config, event stream, error event' '
test_when_finished "rm trace.event actual expect" &&
test_config_global trace2.eventTarget "$(pwd)/trace.event" &&
test-tool trace2 003error "hello world" "this is a test" &&
perl "$TEST_DIRECTORY/t0212/parse_events.perl" <trace.event >actual &&
sed -e "s/^|//" >expect <<-EOF &&
|VAR1 = {
| "_SID0_":{
| "argv":[
| "_EXE_",
| "trace2",
| "003error",
| "hello world",
| "this is a test"
| ],
| "errors":[
| "%s",
| "%s"
| ],
| "exit_code":0,
| "hierarchy":"trace2",
| "name":"trace2",
| "version":"$V"
| }
|};
EOF
test_cmp expect actual
'
test_expect_success 'discard traces when there are too many files' '
mkdir trace_target_dir &&
test_when_finished "rm -r trace_target_dir" &&
(
GIT_TRACE2_MAX_FILES=5 &&
export GIT_TRACE2_MAX_FILES &&
cd trace_target_dir &&
test_seq $GIT_TRACE2_MAX_FILES >../expected_filenames.txt &&
xargs touch <../expected_filenames.txt &&
cd .. &&
GIT_TRACE2_EVENT="$(pwd)/trace_target_dir" test-tool trace2 001return 0
) &&
echo git-trace2-discard >>expected_filenames.txt &&
ls trace_target_dir >ls_output.txt &&
test_cmp expected_filenames.txt ls_output.txt &&
head -n1 trace_target_dir/git-trace2-discard | grep \"event\":\"version\" &&
head -n2 trace_target_dir/git-trace2-discard | tail -n1 | grep \"event\":\"too_many_files\"
'
test_done
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