@matheusbsbs / matheus-bagliano / commits / 3c8c638df6

t0213: add trace2 cmd_ancestry tests

Add a new test script t0213-trace2-ancestry.sh that verifies cmd_ancestry events across all three trace2 output formats (normal, perf, and event). The tests use the "400ancestry" test helper to spawn child processes with controlled trace2 environments. Git alias resolution (which spawns a child git process) creates a predictable multi-level process tree. Filter functions extract cmd_ancestry events from each format, truncating the ancestor list at the outermost "test-tool" so that only the controlled portion of the tree is verified, regardless of the test runner environment. A runtime prerequisite (TRACE2_ANCESTRY) is used to detect whether the platform has a real procinfo implementation; platforms with only the stub are skipped. We must pay attention to an extra ancestor on Windows (MINGW) when running without the bin-wrappers (such as we do in CI). In this situation we see an extra "sh.exe" ancestor after "test-tool.exe". Also update the comment in t0210-trace2-normal.sh to reflect that ancestry testing now has its own dedicated test script. Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Matthew John Cheetham committed Feb 13, 2026 at 19:55 UTC 3c8c638df66d6a77d280a04321aeb18b2ad61338
3 files changed +184 -2
t/meson.build
+1
@@ -131,6 +131,7 @@ integration_tests = [
131 't0210-trace2-normal.sh',
132 't0211-trace2-perf.sh',
133 't0212-trace2-event.sh',
134 + 't0213-trace2-ancestry.sh',
135 't0300-credentials.sh',
136 't0301-credential-cache.sh',
137 't0302-credential-store.sh',
t/t0210-trace2-normal.sh
+3 -2
@@ -74,8 +74,9 @@ scrub_normal () {
74 # This line is only emitted when RUNTIME_PREFIX is defined,
75 # so just omit it for testing purposes.
76 #
77 - # 4. 'cmd_ancestry' is not implemented everywhere, so for portability's
78 - # sake, skip it when parsing normal.
77 + # 4. 'cmd_ancestry' output depends on how the test is run and
78 + # is not relevant to the features we are testing here.
79 + # Ancestry tests are covered in t0213-trace2-ancestry.sh instead.
80 sed \
81 -e 's/elapsed:[0-9]*\.[0-9][0-9]*\([eE][-+]\{0,1\}[0-9][0-9]*\)\{0,1\}/elapsed:_TIME_/g' \
82 -e "s/^start '[^']*' \(.*\)/start _EXE_ \1/" \
t/t0213-trace2-ancestry.sh new
+180
@@ -0,0 +1,180 @@
1 +#!/bin/sh
2 +
3 +test_description='test trace2 cmd_ancestry event'
4 +
5 +. ./test-lib.sh
6 +
7 +# Turn off any inherited trace2 settings for this test.
8 +sane_unset GIT_TRACE2 GIT_TRACE2_PERF GIT_TRACE2_EVENT
9 +sane_unset GIT_TRACE2_BRIEF
10 +sane_unset GIT_TRACE2_CONFIG_PARAMS
11 +
12 +# Add t/helper directory to PATH so that we can use a relative
13 +# path to run nested instances of test-tool.exe (see 004child).
14 +# This helps with HEREDOC comparisons later.
15 +TTDIR="$GIT_BUILD_DIR/t/helper/" && export TTDIR
16 +PATH="$TTDIR:$PATH" && export PATH
17 +
18 +# The 400ancestry helper spawns a child process so that the child
19 +# sees "test-tool" in its process ancestry. We capture only the
20 +# child's trace2 output to a file.
21 +#
22 +# The tests use git commands that spawn child git processes (e.g.,
23 +# alias resolution) to create a controlled multi-level process tree.
24 +# Because cmd_ancestry walks the real process tree, processes will
25 +# also report ancestors above "test-tool" that depend on the test
26 +# runner environment (e.g., bash, make, tmux). The filter functions
27 +# below truncate the ancestry at "test-tool", discarding anything
28 +# above it, so only the controlled portion is verified.
29 +#
30 +# On platforms without a real procinfo implementation (the stub),
31 +# no cmd_ancestry event is emitted. We detect this at runtime and
32 +# skip the format-specific tests accordingly.
33 +
34 +# Determine if cmd_ancestry is supported on this platform.
35 +test_expect_success 'detect cmd_ancestry support' '
36 + test_when_finished "rm -f trace.detect" &&
37 + GIT_TRACE2_BRIEF=1 GIT_TRACE2="$(pwd)/trace.detect" \
38 + test-tool trace2 001return 0 &&
39 + if grep -q "^cmd_ancestry" trace.detect
40 + then
41 + test_set_prereq TRACE2_ANCESTRY
42 + fi
43 +'
44 +
45 +# Filter functions for each trace2 target format.
46 +#
47 +# Each extracts cmd_ancestry events, strips format-specific syntax,
48 +# and truncates the ancestor list at the outermost "test-tool"
49 +# (or "test-tool.exe" on Windows), discarding any higher-level
50 +# (uncontrolled) ancestors.
51 +#
52 +# Output is a space-separated list of ancestor names, one line per
53 +# cmd_ancestry event, with the immediate parent listed first:
54 +#
55 +# test-tool (or: test-tool.exe)
56 +# git test-tool (or: git.exe test-tool.exe)
57 +# git test-tool test-tool (or: git.exe test-tool.exe test-tool.exe)
58 +
59 +if test_have_prereq MINGW
60 +then
61 + TT=test-tool$X
62 +else
63 + TT=test-tool
64 +fi
65 +
66 +filter_ancestry_normal () {
67 + sed -n '/^cmd_ancestry/{
68 + s/^cmd_ancestry //
69 + s/ <- / /g
70 + s/\(.*'"$TT"'\) .*/\1/
71 + p
72 + }'
73 +}
74 +
75 +filter_ancestry_perf () {
76 + sed -n '/cmd_ancestry/{
77 + s/.*ancestry:\[//
78 + s/\]//
79 + s/\(.*'"$TT"'\) .*/\1/
80 + p
81 + }'
82 +}
83 +
84 +filter_ancestry_event () {
85 + sed -n '/"cmd_ancestry"/{
86 + s/.*"ancestry":\[//
87 + s/\].*//
88 + s/"//g
89 + s/,/ /g
90 + s/\(.*'"$TT"'\) .*/\1/
91 + p
92 + }'
93 +}
94 +
95 +# On Windows (MINGW) when running with the bin-wrappers, we also see "sh.exe" in
96 +# the ancestry. We must therefore account for this expected ancestry element in
97 +# the expected output of the tests.
98 +if test_have_prereq MINGW && test -z "$no_bin_wrappers"; then
99 + SH_TT="sh$X $TT"
100 +else
101 + SH_TT="$TT"
102 +fi
103 +
104 +# Git alias resolution spawns the target command as a child process.
105 +# Using "git -c alias.xyz=version xyz" creates a two-level chain:
106 +#
107 +# test-tool (400ancestry)
108 +# -> git (resolves alias xyz -> version)
109 +# -> git (version)
110 +#
111 +# Both git processes are instrumented and emit cmd_ancestry. After
112 +# filtering out ancestors above test-tool, we get:
113 +#
114 +# test-tool (from git alias resolver)
115 +# git test-tool (from git version)
116 +
117 +test_expect_success TRACE2_ANCESTRY 'normal: git alias chain, 2 levels' '
118 + test_when_finished "rm -f trace.normal actual expect" &&
119 + test-tool trace2 400ancestry normal "$(pwd)/trace.normal" \
120 + git -c alias.xyz=version xyz &&
121 + filter_ancestry_normal <trace.normal >actual &&
122 + cat >expect <<-EOF &&
123 + $SH_TT
124 + git$X $SH_TT
125 + EOF
126 + test_cmp expect actual
127 +'
128 +
129 +test_expect_success TRACE2_ANCESTRY 'perf: git alias chain, 2 levels' '
130 + test_when_finished "rm -f trace.perf actual expect" &&
131 + test-tool trace2 400ancestry perf "$(pwd)/trace.perf" \
132 + git -c alias.xyz=version xyz &&
133 + filter_ancestry_perf <trace.perf >actual &&
134 + cat >expect <<-EOF &&
135 + $SH_TT
136 + git$X $SH_TT
137 + EOF
138 + test_cmp expect actual
139 +'
140 +
141 +test_expect_success TRACE2_ANCESTRY 'event: git alias chain, 2 levels' '
142 + test_when_finished "rm -f trace.event actual expect" &&
143 + test-tool trace2 400ancestry event "$(pwd)/trace.event" \
144 + git -c alias.xyz=version xyz &&
145 + filter_ancestry_event <trace.event >actual &&
146 + cat >expect <<-EOF &&
147 + $SH_TT
148 + git$X $SH_TT
149 + EOF
150 + test_cmp expect actual
151 +'
152 +
153 +# Use 004child to add a test-tool layer, creating a three-level chain:
154 +#
155 +# test-tool (400ancestry)
156 +# -> test-tool (004child)
157 +# -> git (resolves alias xyz -> version)
158 +# -> git (version)
159 +#
160 +# Three instrumented processes emit cmd_ancestry. After filtering:
161 +#
162 +# test-tool (from test-tool 004child)
163 +# test-tool test-tool (from git alias resolver)
164 +# git test-tool test-tool (from git version)
165 +
166 +test_expect_success TRACE2_ANCESTRY 'normal: deeper chain, 3 levels' '
167 + test_when_finished "rm -f trace.normal actual expect" &&
168 + test-tool trace2 400ancestry normal "$(pwd)/trace.normal" \
169 + test-tool trace2 004child \
170 + git -c alias.xyz=version xyz &&
171 + filter_ancestry_normal <trace.normal >actual &&
172 + cat >expect <<-EOF &&
173 + $TT
174 + $SH_TT $TT
175 + git$X $SH_TT $TT
176 + EOF
177 + test_cmp expect actual
178 +'
179 +
180 +test_done