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Krzysztof kuhy Rudnicki
f6356d4725
Shell redirections are builtins, so no PATH stub can intercept `cat > /etc/modprobe.d/x.conf`. That left installer scripts unverifiable: stub cp/chmod/ln and the trace is nearly empty, don't and the run rewrites the live system. --prefix redirects HOME and every XDG_* base into a temp tree. XDG_DATA_HOME is exported explicitly, not left to default off HOME: install_leechblock.sh reads it directly and then runs `rsync -a --delete` at it. --bind-abs binds hardcoded absolutes via bwrap --unshare-user --uid 0, leaf directories only. uid 0 is load-bearing beyond permissions: common.sh's require_root does `exec sudo "$0"`, and under the sudo stub that truncated the whole run to one recorded call -- a trace that diffs clean against any split. Binding /etc wholesale was measured to shadow /etc/passwd, collapse $SUDO_USER to /home//, and mask a nested bind, so the scanner never emits it. The trace gains a manifest of every file written, with content hashes. That section is the point: with it, a dropped write in the fixture pair is a one-line diff; with it stripped, the two traces are identical, i.e. the old harness passed that broken split. Hashes normalize the prefix to @PREFIX@ because install_usage_monitoring.sh writes an unquoted heredoc that bakes $HOME into the artifact. Verified: ~/.config/systemd/user, ~/.local/bin, ~/.local/share and /etc/modprobe.d byte-identical before and after; usage-report units still 2. The three prior regressions are now committed fixtures rather than ad-hoc -- one was silently neutered mid-change when a trailing echo added for SC2034 became the function's last statement and turned exit 1 into exit 0. Stub generation moved to lib/ because --prefix pushed the harness to 252 lines, over the cap it exists to serve. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011w2Pj4Ek3ZNMQVYcFHgXDY
28 lines
816 B
Bash
Executable File
28 lines
816 B
Bash
Executable File
#!/usr/bin/env bash
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# Regression fixture: the silent-stub trap.
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#
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# `du` stubbed to print NOTHING makes size="" , so `((size > 0))` is false,
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# the guarded branch is skipped, and two traces match perfectly while
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# exercising none of the code under test.
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#
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# trace_shell_split.sh valued_stub_branch.sh --stub du
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# -> size=[] / branch skipped, never reaches the guarded sudo rm -rf
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# trace_shell_split.sh valued_stub_branch.sh --stub 'du=4096'
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# -> size=[4096] / BRANCH TAKEN, and the sudo call is captured
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#
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# The point of keeping this: an empty stub is not a passing test, it is a test
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# that never ran.
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set -euo pipefail
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size="$(du -sk /some/dir 2>/dev/null | cut -f1)"
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echo "size=[$size]"
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if ((${size:-0} > 0)); then
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echo "BRANCH TAKEN"
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sudo rm -rf /some/dir/cache
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else
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echo "branch skipped"
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fi
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