mirror of
https://github.com/kuhyx/testsAndMisc.git
synced 2026-11-11 18:54:03 +01:00
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
73 lines
2.9 KiB
Bash
Executable File
73 lines
2.9 KiB
Bash
Executable File
#!/usr/bin/env bash
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# ============================================================================
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# PATH stub generation for trace_shell_split.sh.
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#
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# Split out of trace_shell_split.sh when --prefix pushed that file past the
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# 250-line cap. The harness is not exempt from the rule it exists to serve.
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#
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# These stubs shadow mutating BINARIES. Mutating REDIRECTIONS (`cat > /etc/...`)
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# cannot be intercepted this way at all and are handled by lib/trace_prefix.sh.
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# ============================================================================
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# Commands that change the system, the phone, or the package set. Each becomes
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# a stub that records its invocation and exits 0. Extend deliberately: a
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# missing name here means the real binary runs.
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#
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# Deliberately NOT here: `git`, `curl`, `wget`, `makepkg`. Those are stubbed
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# per-run via --stub, because plenty of scripts read git state harmlessly and a
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# blanket git stub would change what they see rather than protect anything.
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# Grep the target for network and build verbs before tracing it.
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readonly DEFAULT_STUBBED_COMMANDS=(
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sudo pacman yay paru systemctl systemd-run
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adb fastboot
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nft iptables ip6tables firewall-cmd
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mount umount swapoff modprobe
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useradd usermod visudo chpasswd
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mkinitcpio grub-mkconfig bootctl
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npm pip pip3 flutter gradle
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reboot shutdown poweroff halt
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)
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# One stub per mutating command: append the call to the trace, succeed.
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# Stubs report success because the point is to reach later code paths, not to
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# simulate failure. A script whose logic branches on a real exit status needs a
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# hand-written stub instead -- note that in the split's evidence file.
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#
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# A stub may carry an output value as `name=text` (from --stub). This matters
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# more than it looks: a stub that prints nothing makes every `size=$(du ...)`
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# empty, so every `((size > 0))` is false and the trace walks straight past all
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# the branches you wanted to compare. Two such traces are identical and
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# meaningless. Give value-producing commands a plausible non-zero output.
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#
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# Extra stubs are passed as the trailing arguments rather than read from a
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# global, so this stays callable independently of the caller's variables.
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write_stubs() {
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local bin_dir="$1" entry name value
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shift
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mkdir -p "$bin_dir"
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for entry in "${DEFAULT_STUBBED_COMMANDS[@]}" "$@"; do
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name="${entry%%=*}"
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value=""
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if [[ $entry == *=* ]]; then
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value="${entry#*=}"
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fi
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# Quoted heredoc: everything is literal, so $* and $TRACE_FILE reach
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# the generated stub instead of expanding here. Only $name and $value
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# are interpolated, via the unquoted echo lines around it.
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{
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echo "#!/usr/bin/env bash"
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echo "STUB_NAME=$(printf '%q' "$name")"
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echo "STUB_VALUE=$(printf '%q' "$value")"
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cat <<'STUB'
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printf '%s %s\n' "$STUB_NAME" "$*" >>"$TRACE_FILE"
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if [[ -n $STUB_VALUE ]]; then
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printf '%s\n' "$STUB_VALUE"
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fi
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exit 0
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STUB
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} >"$bin_dir/$name"
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chmod +x "$bin_dir/$name"
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done
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}
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