Remove only the link at a generated path, never what it resolves to - #142
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Baseline of the first agent's work, plus the three-arg call site fix.
Takes main's requireNoOrphanedArtifact check ahead of the removal, and drops this branch's private lastSegment in favour of main's lastPathSegment, which computes the same segment. isSymlinkIn hashes it at the call site, the same way requireNoOrphanedArtifactIn already does.
main's requireNoOrphanedArtifactIn reads the directory through the single argument readDir, which RemovalVm did not have, so the six tests that drive buildFileForContract through it reverted with no data before reaching the removal they are about. Both overloads report the constructed listing, because one directory has one set of entries whichever of them asks.
Walkthrough
ChangesSymlink-safe generated file replacement
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The change safely replaces live symlinks without deleting their targets, but the new filesystem operations may need lint suppressions before merge to avoid repository check failures; owner follow-up is warranted. Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@src/lib/LibFs.sol`:
- Around line 309-318: Add unsafe-cheatcode suppressions immediately before the
vm.readDir call in isSymlinkIn and the vm.tryFfi call around the corresponding
FFI usage, covering the VmSafe and three-argument overloads so forge lint no
longer reports them.
In `@test/src/lib/LibFs.buildFileForContract.t.sol`:
- Around line 491-519: Update RemovalVm to record the argv received by tryFfi
and expose it through lastCommand(), making tryFfi non-view if needed. Preserve
the stand-in from removalOutcome and, in
testBuildFileForContractWritesWhenTheRemovalSucceeds, assert the recorded
command is exactly rm, -f, --, and LibFs.pathForContract(name).
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Configuration used: Organization UI
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Run ID: d3043138-8bb8-4af5-8044-b7794815a7f4
📒 Files selected for processing (4)
src/lib/LibFs.soltest/concrete/RemovalVm.soltest/src/lib/LibFs.buildFileForContract.t.soltest/src/lib/LibFs.isPresent.t.sol
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`RemovalVm.tryFfi` ignored its argument, so nothing in the suite observed the command `removeSymlink` builds. The flags are where the safety of shelling out lives — `-f` and no `-r`, `--` before the operand, the path as the only operand — and every existing removal test reads the exit code the stand-in was constructed with, which no argv change affects. A regression adding `-r`, dropping `--`, or acting on another path passed all of them. The stand-in carries the argv out in a revert rather than recording it. Every call that reaches `tryFfi` goes on to revert, and that unwinds the stand-in's storage with the rest of the frame, so a recorded command is gone before a test can read it — which is why the write and the cheatcode removal already report themselves by reverting. Mutation pass over `src/lib/LibFs.sol` goes 20/23 to 22/23. The two argv survivors, `-f` -> `-v` and `--` -> `-v`, are now killed, and the new test is the only killer of either. The remaining survivor is `readDir` told to follow links at depth 1, which is equivalent. The `unsafe-cheatcode` lint directives CodeRabbit asked for on the new `vm.readDir` and `vm.tryFfi` calls are not added, because the rule does not fire on them. `forge lint --only-lint unsafe-cheatcode` over forge 1.7.2-nightly reports 103 findings, all in `test/**` and none in `src/**`; stripping every existing directive from `src/lib/LibFs.sol` raises that to 105, and the two it adds are `vm.removeFile` and `vm.writeFile`, not `readDir` or `tryFfi`. A directive on either would suppress nothing. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Closes #141
What was wrong
LibFs.buildFileForContract's unlink loop reached what a symlink at thegenerated path pointed at, not the link.
vm.removeFileresolves the pathbefore it acts, so the first pass deleted the link's target — a second file
at a second path nobody named, bounded only by the calling project's
fs_permissions— and left the link behind, dangling. The second pass thenremoved the link and the write went ahead, reporting success. In this repo that
reaches
meta/, which holds committed input that ships in the published soldeerpackage.
What it does now
A symlink at the generated path is still replaced, not refused, and the file
at the other end of it is left byte for byte as it was, wherever it is.
isSymlinkIn(vm, dir, path)asksvm.readDir(dir, 1, false)whether the entrynamed by the path is itself a symlink. It is the only thing in forge-std 1.16.2
that can tell: every cheatcode that takes a path resolves it first, so
vm.exists,vm.isFileandvm.fsMetadata(...).isSymlinkall answer for thetarget and
vm.readLinkreverts outright on a live link.readDirreportswhat walking the directory found, so each entry's
isSymlinkis about theentry.
removeSymlink(vm, path)shells out torm -f -- <path>, which acts on thename it is given and never follows a symlink operand. A non-zero exit reverts
with the typed
SymlinkRemovalFailed(path, exitCode, stderr)rather thanfalling through to a write that a surviving link would redirect.
whileloop is a singleif. One removal always leaves the path holdingnothing or reverts, so there is nothing to spin on — a chain and a cycle both
terminate in one pass.
a regular file and a directory all still go through
vm.removeFile, so aconsumer that has not set
ffi = truegenerates normally and only meets therequirement in the one case that cannot be handled without destroying
something.
buildFileForTaggedContractdelegates to the same overload, so the taggedwrites #137 added are covered by the same change; its docstring, which still
described the unlink loop, now describes what happens.
Meeting
mainmainmoved under this branch twice while it was open, and both merges are inhere rather than left for the merge button.
requireNoOrphanedArtifactlanded onmainand sits immediately ahead of theremoval this PR rewrites, so the resolution keeps it there: the orphan check
still refuses before anything is unlinked, and the removal below it is the new
one.
mainalso grewlastPathSegment, which computes exactly what thisbranch's own private
lastSegmentdid, solastSegmentis gone andisSymlinkInhasheslastPathSegmentat the call site — the same wayrequireNoOrphanedArtifactInalready did. One implementation of that scan, nottwo.
That merge broke six tests in a way no conflict marker showed: the orphan check
reads the directory through the single argument
readDir, which theRemovalVmstand-in did not have, so those six reverted with no data beforereaching the removal they are about. The stand-in answers that overload now, and
answers it with the same listing the three argument one reports, because one
directory has one set of entries whichever of them asks.
Tests
262 → 275. Thirteen new tests, and
testBuildFileForContractReplacesLiveSymlinkstrengthened in place rather thanduplicated.
Real filesystem, through
buildFileForContract:no test made before, and the one the old code failed
meta/, the case the issue is about: the committed file isuntouched
src/generated/<tag>/ <Name>.solbesidesrc/generated/<Name>.sol) does not answer for the pathAgainst
test/concrete/RemovalVm.sol, aVm-shaped stand-in whose answers aboutthe path are constructed rather than arranged on disk, so which removal was
reached is what the test reads and nothing lands anywhere:
stderr out in the revert
rm,-f,--, the path — the stand-in carriesthe argv it was handed out in a revert, since the call that reaches it always
reverts and would unwind anything recorded
cheatcode rather than by shelling out
at the path falls to the cheatcode
Mutation
23 mutants over the changed code, each one applied to
src/lib/LibFs.solandscored against the whole suite. 22 killed, 1 survived, no unscorable runs.
The one that matters most is the last: putting the
while (isPresent(...)) vm.removeFile(path)loop back — the exact code this issue is about — is killedby five tests, so the defect cannot return unnoticed. Inverting or ignoring the
exit code check, dropping any of the three fields from
SymlinkRemovalFailed, swapping which removal each branch takes, shelling outfor a dangling link or a regular file, running a command that removes nothing,
asking
readDirfor depth 2, and answering for the first entry rather than thenamed one are all killed too.
The argv
removeSymlinkbuilds is now asserted argument for argument, bytestBuildFileForContractRemovesTheSymlinkWithAForcedRmAndEndedOptions. The twoflag mutants that used to survive —
rm -vforrm -f, andrm -vforrm --— are killed by it, and it is their only killer. Nothing else in the suite looks
at the command: the other removal tests read the exit code the stand-in was
built with, which dropping a flag does not change, so
-for--going missingwas invisible to all of them.
-rappearing, or the operand changing, was too.Those two were previously argued unreachable and left untested, on the grounds
that
-f's prompt and--'s leading-cannot arise from a path this librarybuilds. That reasoning was about the filesystem, not about the test suite: the
argv is a fixed four-element array that a test can read directly, so the flags
carrying the safety of shelling out are now pinned rather than argued.
One survivor is left, and it gets no test written to chase it:
readDir(dir, 1, true)instead offalse— whether the walk is told tofollow links changes what it descends into, and at depth 1 it descends into
nothing. Each entry's own
isSymlinkstill comes from the walk either way, sothe two calls answer identically for every directory.
Two things the run itself turned up:
maingrewlastPathSegmentwhile this was open, duplicating this branch'sprivate
lastSegment. Folding the two together did not just remove theduplicate:
lastPathSegmentarrives with its own tests, and those tests killa mutant that survived against
lastSegment. That is in this PR.src/generatedis scratch the suite writes into andsrc = 'src'means forgecompiles it, so a test that reverts before reaching its own cleanup leaves a
fixture behind — and some of those fixtures hold content that is not Solidity
(
DECOY,STALE,PRE-EXISTING). Every laterforgeinvocation then failsto compile, until someone clears the directory by hand, and the failure names
a file that has nothing to do with what they were doing. The mutation run hit
this hard: one killed mutant left a fixture behind and the next eleven scored
unscorable rather than passing. Clearing the directory ahead of each run is a
change to the probe's own config, not to this repo — the hazard is still
here, it predates this branch, and it wants a fix of its own rather than being
smuggled into this one.
QA
testBuildFileForContractReplacesLiveSymlink,testBuildFileForContractLeavesATargetOutsideTheGeneratedDirectoryAlone,testBuildFileForContractReplacesASymlinkChain,testBuildFileForContractReplacesASymlinkCycle,testBuildFileForContractReplacesASymlinkToADirectory,testBuildFileForContractMatchesOnlyDirectChildren,testBuildFileForContractRefusesADirectoryAtThePath,testBuildFileForContractRefusesToWriteWhenTheRemovalFails,testBuildFileForContractWritesWhenTheRemovalSucceeds,testBuildFileForContractRemovesANonSymlinkWithTheCheatcode,testBuildFileForContractRemovesADanglingSymlinkWithTheCheatcode,testBuildFileForContractMatchesTheEntryByName,testBuildFileForContractRemovesWithTheCheatcodeWhenTheListingIsEmpty,testBuildFileForContractRemovesTheSymlinkWithAForcedRmAndEndedOptions— eachfails on base, verified by mutant M23, which restores base's
while (isPresent(vm, path)) vm.removeFile(path)loop verbatim and is killedby five of them, the target-bytes assertions among them.
src/lib/LibFs.sol, 22 killed / 1 survived / 0unscorable. Selected
line -> mutation -> killing test:while (isPresent(...)) { vm.removeFile(path); }(base's loop restored) ->testBuildFileForContractReplacesLiveSymlink;if (result.exitCode != 0)->== 0->testBuildFileForContractRefusesToWriteWhenTheRemovalFails;if (result.exitCode != 0)->if (false)-> same test;revert SymlinkRemovalFailed(path, result.exitCode, result.stderr)-> each ofthe three fields dropped in turn -> same test;
command[0] = "rm"->"true"->testBuildFileForContractReplacesLiveSymlink;vm.readDir(dir, 1, false)-> depth2->testBuildFileForContractMatchesOnlyDirectChildren;if (keccak256(bytes(lastPathSegment(entries[i].path))) == name)->if (true)->testBuildFileForContractMatchesTheEntryByName;return entries[i].isSymlink->true/false->testBuildFileForContractRemovesANonSymlinkWithTheCheatcode/testBuildFileForContractReplacesLiveSymlink;if (vm.exists(path) && isSymlinkIn(vm, dir, path))-> each conjunct droppedand
&&->||->testBuildFileForContractRemovesADanglingSymlinkWithTheCheatcode;the two removals swapped ->
testBuildFileForContractRemovesANonSymlinkWithTheCheatcode;if (isPresent(vm, path))->true/false->testBuildFileForContractCreatesTheDirectory/testBuildFileForContractRemovesADanglingSymlinkWithTheCheatcode;start = i + 1->start = i->testLastPathSegmentAbsolutePath;command[1] = "-f"->"-v"andcommand[2] = "--"->"-v"->testBuildFileForContractRemovesTheSymlinkWithAForcedRmAndEndedOptions, whichis the only test that kills either.
The 1 survivor (
readDirfollow-links at depth 1) is argued equivalent underMutation above, and deliberately has no test written for it.
survives byte for byte, a dangling link / regular file / cycle still come off
the path, a directory still reverts, and termination is preserved. Expected
bytes come from seeded sentinels (
SENTINEL,COMMITTED,DECOY) read backafter the call, and generated content is compared against a second contract
generated at a path that held nothing, so the assertion is that the two cases
agree rather than that particular bytes appear. Neither is derived from the
implementation.
dangling symlink removed, regular file removed, directory still reverts, and
termination preserved on a chain or cycle — all five covered, plus the
meta/case the issue names as the concrete blast radius and thedeeper-entry-sharing-a-name case the depth-1 listing depends on.
Summary by CodeRabbit