feat(builtins): add rm builtin (remediation mode only)#537
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Adds `rm` as a new builtin command, available exclusively in remediation mode. Like `truncate`, it is gated behind a `Remove` capability on `CallContext` that is only wired when `interp.WithMode(interp.ModeRemediation)` is active. Supported flags: `-f/--force`, `-v/--verbose`, `-d/--dir`, `-h/--help`. No recursive deletion (`-r`/`-R`). Symlinks are removed as-is (the link, not the target). All deletions are routed through the `AllowedPaths` sandbox via a new `Sandbox.Remove` method that preserves the raw error chain (no `PortablePathError` wrapping), so `errors.Is(err, os.ErrNotExist)` works correctly for `-f` suppression. The `LstatFile` pre-check for directory detection is intentional: on macOS, `os.Root.Remove` returns nil for empty directories, so relying on Remove's error alone would silently delete directories when `-d` is not given. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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| help := fs.BoolP("help", "h", false, "print usage and exit") | ||
| force := fs.BoolP("force", "f", false, "ignore nonexistent files, never prompt") | ||
| dir := fs.BoolP("dir", "d", false, "remove empty directories") | ||
| verbose := fs.BoolP("verbose", "v", false, "print a message for each removed file") |
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In remediation mode, these BoolP registrations let pflag accept explicit values like rm --force=false target.txt, rm --verbose=false target.txt, or rm --dir=true emptydir; GNU rm --help documents these as no-argument options and coreutils rejects --force=false before touching operands. With the current parser, those invocations are treated as valid and can delete the operand instead of failing, so use a no-argument boolean flag implementation here as in the existing df helper.
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Will do in another PR as this impacts a lot of builtins
GNU rm defines "rm -f" with no operands as a success — it is a no-op that exits 0. This allows defensive remediation scripts like `rm -f $maybe_empty` to be idempotent. Previously the missing-operand check was unconditional and would print "rm: missing operand" and exit 1 even with --force. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
julesmcrt
requested review from
AlexandreYang,
astuyve,
matt-dz,
thieman and
val06
as code owners
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| @@ -0,0 +1,17 @@ | |||
| # Derived from GNU coreutils test rm/rm-e.sh basic removal case. | |||
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GNU coreutils test suite is GPLv3+, so work derived from it should also be GPLv3+.
We don't have a rm/rm-e.sh test, though, which inspires a lot of confidence in Claude and/or Codex. :)
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Thanks for flagging. The tests for the different commands aren't derived from coreutils tests, they are simple blackbox tests, based on documented POSIX behavior, and using rshell's bash comparison harness. Indeed, that file doesn't even exist in coreutils, and the comment is clearly a hallucination from the agent.
We will remove the header comment, which is definitely misleading, and will carefully review the rest of this PR before merging.
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I think rm is a quite powerful/dangerous command.
Let's evaluate more deeply if we need rm or something more tailored to "cleanup" use cases.
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| // is a directory. We only care about the type here; stat errors are ignored | ||
| // and Remove surfaces its own (more precise) error below. | ||
| if !allowDir { | ||
| if info, err := callCtx.LstatFile(ctx, path); err == nil && info.IsDir() { |
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When a script uses a quoted empty expansion such as rm -f "$path" with path empty, this passes "" into LstatFile; the sandbox resolves that via filepath.Join(cwd, "") to the current directory, so this branch reports Is a directory before -f can suppress the missing-file case. GNU/bash rm -f "" succeeds silently because the empty operand is a nonexistent path, so defensive quoted cleanups can now fail and stop remediation scripts.
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| @@ -0,0 +1,172 @@ | |||
| // Unless explicitly stated otherwise all files in this repository are licensed | |||
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I'm wondering if it might be better to implement something like cleanup, as suggested here:
Lines 569 to 629 in 69ef5c0
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Closing this PR as we are reconsidering adding |
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Summary
rmas a new builtin command available exclusively in remediation mode (interp.WithMode(interp.ModeRemediation))-f/--force(ignore missing files),-v/--verbose(print each removal),-d/--dir(allow empty dirs),-h/--help(usage to stdout)-r/-Rare rejected); symlinks are removed as-is without followingAllowedPathssandbox via a newSandbox.RemovemethodKey design decisions
Sandbox.Removepreserves the raw error chain (noPortablePathErrorwrapping), soerrors.Is(err, os.ErrNotExist)works correctly for-fsuppression. This is the same reasonLstatFileerrors can't be used for ENOENT detection.LstatFile pre-check for directory detection is intentional: on macOS,
os.Root.Removereturnsnilfor empty directories (it falls back tormdir), so relying on Remove's error alone would silently delete directories when-dis not given. The pre-check withLstatFileprovides a cross-platform "is a directory" guard before the Remove syscall.Test plan
builtins/rm/rm_test.go(all flags, error cases, sandbox restrictions, context cancellation)tests/scenarios/cmd/rm/(basic, errors, hardening)interp/builtin_rm_pentest_test.go(mode guard, path traversal, symlink attacks, flag rejection)builtins/rm/rm_fuzz_test.go(path fuzzing, flag combinator), added tofuzz.ymlSHELL_FEATURES.mdupdated;rmappears inhelpoutput under "Disabled commands" in read-only modego test ./... -timeout 120s🤖 Generated with Claude Code