fix(gateguard): check isDestructiveFindExec on each command segment to close compound-command bypass (#2292)

* fix(gateguard): check isDestructiveFindExec on each command segment

`isDestructiveBash` called `isDestructiveFindExec` only on the raw full
command string. When the raw string starts with a non-find command (e.g.
`echo x && find . -exec rm {} \;`), `isDestructiveFindExec` checks
tokens[0] and returns false — then the per-segment loop never calls it
again, letting the destructive `find -exec rm` segment through silently.

Fix: call `isDestructiveFindExec(segment)` inside the per-segment loop so
compound commands (`&&`, `;`, `|`) cannot be used to prepend a harmless
command and bypass the find-exec destructive check.

Adds three regression tests covering `&&`, `;`, and `|` bypass patterns.

* fix(gateguard): use raw body segments for isDestructiveFindExec to close quoted-binary gap

The previous per-segment call passed quote-stripped output from
splitCommandSegments to isDestructiveFindExec, so a quoted exec binary
like find . -exec 'rm' {} \; would arrive as find . -exec  {} \; and
the check would silently miss it.

Switch to splitting collectExecutableBodies output on [;|&]+ without
quote-stripping first, so the find-exec binary name is always intact
when isDestructiveFindExec inspects it. This also covers || and
background & separators that the original tests did not exercise.

Adds a regression test for the || OR-chain bypass pattern.

Addresses Greptile review comments on PR #2292.

---------

Co-authored-by: kapilvus <kapilvus@gmail.com>

scripts/hooks/gateguard-fact-force.js

@@ -545,10 +545,20 @@ function isDestructiveBash(command) {
   const extra = getExtraDestructiveRegex();
   if (extra && extra.test(flattened)) return true;
 
-  // Check for destructive find -exec patterns
-  if (isDestructiveFindExec(raw)) return true;
+  // Check for destructive find -exec patterns on raw body segments (before quote-stripping)
+  // so that quoted exec binaries and compound-command prefixes are both handled correctly.
+  // splitCommandSegments strips quotes before splitting, so passing its output to
+  // isDestructiveFindExec would turn `find . -exec 'rm' {} \;` into `find . -exec  {} \;`
+  // — the binary name disappears and the check returns false.  Using raw body text avoids
+  // that false-negative while also catching `&&`, `;`, `|`, and `||` compound forms.
+  const bodies = collectExecutableBodies(raw);
+  for (const body of bodies) {
+    for (const rawSeg of body.split(/[;|&]+/).map(s => s.trim()).filter(Boolean)) {
+      if (isDestructiveFindExec(rawSeg)) return true;
+    }
+  }
 
-  const segments = collectExecutableBodies(raw).flatMap(splitCommandSegments);
+  const segments = bodies.flatMap(splitCommandSegments);
   for (const segment of segments) {
     const stripped = stripQuotedStrings(segment);
     if (DESTRUCTIVE_SQL_DD.test(stripped)) return true;

tests/hooks/gateguard-fact-force.test.js

@@ -1613,6 +1613,26 @@ function runTests() {
       'find -exec git reset --hard');
   })) passed++; else failed++;
 
+  if (test('denies find -exec rm {} \\; preceded by && (bypass via compound command)', () => {
+    expectDestructiveDeny('echo x && find . -exec rm {} \\;',
+      'compound command bypass: find -exec rm');
+  })) passed++; else failed++;
+
+  if (test('denies find -exec rm -rf {} \\; preceded by ; (bypass via semicolon)', () => {
+    expectDestructiveDeny('true; find . -name "*.log" -exec rm -rf {} \\;',
+      'semicolon bypass: find -exec rm -rf');
+  })) passed++; else failed++;
+
+  if (test('denies find -exec rm {} \\; in pipeline (bypass via pipe)', () => {
+    expectDestructiveDeny('echo start | find . -exec rm {} \\;',
+      'pipe bypass: find -exec rm');
+  })) passed++; else failed++;
+
+  if (test('denies find -exec rm {} \\; after || (OR-chain bypass)', () => {
+    expectDestructiveDeny('false || find . -exec rm {} \\;',
+      'OR-chain bypass: find -exec rm');
+  })) passed++; else failed++;
+
   if (test('allows find -exec echo {} \\; (non-destructive, routine gate)', () => {
     clearState();
     const input = { tool_name: 'Bash', tool_input: { command: 'find . -name "*.tmp" -exec echo {} \\;' } };