test: add test for `Module._stat` #44713

RaisinTen · 2022-09-18T12:31:45Z

Module._stat landed in #44537 without a test, so this change adds one.

Signed-off-by: Darshan Sen raisinten@gmail.com

aduh95

Maybe add mustCalls to ensure it’s indeed being called?

RaisinTen · 2022-09-18T12:42:33Z

@aduh95 aren't mustCalls for making sure that a callback passed to a function gets called? This one's totally synchronous, that's why I tested this completely based on the change in return values.

test/parallel/test-vfs.js

aduh95 · 2022-09-19T07:18:06Z

test/parallel/test-vfs.js

+fs.readFileSync = function readFileSync(pathArgument, options) {
+  if (!pathArgument.startsWith(process.execPath)) {
+    return originalReadFileSync.apply(this, arguments);
+  }
+  if (pathArgument === vfsFile) {
+    return "module.exports = { x: 'y' };";
+  }
+  throw new Error();
+};
+
+fs.realpathSync = function realpathSync(pathArgument, options) {
+  return pathArgument;
+};


Wait, that's not a use case we want to support, mutating fs should not have any effect on Node.js internals, we should fix that.

This is actually how VFSs are implemented in the ecosystem (pkg, electron, etc.) currently and fixing that would break a lot of packages and I believe the intention behind exposing Module._stat is to allow this? I don't think there is any other use case behind Module._stat or Module._readPackage. cc @arcanis

FWIW, we are also trying to find better ways of doing this without monkey-patching in nodejs/single-executable#37.

It shows that we probably also need Module._realPath and Module._readFileSync – or rather, that we need the loader hook API to stabilize. Anyway, I don't know if we want this is our tests, I think we want to break this at some point.

@aduh95 if we start exposing Module._* functions for these, we would have to do so for a lot more functions. These are the ones that Electron overrides - https://github.com/electron/electron/blob/eebf34cc6c4691e2ddca9b5a0a97566aeabd9072/lib/asar/fs-wrapper.ts#L236-L854 (quite a lot!) and there are probably additional ones in yarn's fslib implementation - https://github.com/yarnpkg/berry/tree/76ccb18b3b8cc81e28dbef5f3f867395aa31d5fb/packages/yarnpkg-fslib/sources/patchFs.

Fwiw I personally have an expectation that Node.js should abide to its own fs API (which is part of why _stat and _readPackage were so problematic, being the two places not doing so purely for optimization purposes).

It's probably never been discussed formally before though, and perhaps doing so would be a good thing (if only to get this use case formally recognized, supported, and covered by tests).

I agree that the lack of consistency is quite bad. IMHO Node.js internals should not be affected by user-land actions, however I could see that we still want to support the use case of alternative fs implementation, which could be supplied by e.g. a CLI flag and would affect the whole process, not just the few files where we forgot to use destructuring.

ljharb · 2022-09-19T15:48:59Z

cc @nodejs/modules

GeoffreyBooth · 2022-09-19T16:28:48Z

we need the loader hook API to stabilize

It’s pretty close. Once #44710 and #43772 land and we allow some time for baking, that’s all that’s on our list before declaring the API stable: https://github.com/nodejs/loaders#status

RaisinTen · 2022-10-21T14:48:06Z

To be clear, the PR that exposed Module._stat has already landed and it has been released to v18 and v16, I'm not sure why a test for such a thing wouldn't be accepted. Do y'all have suggestions on what needs to be changed in the test for it to be accepted? I don't think it's a good idea to have untested features laying around. If y'all are not happy that the feature exists, would y'all be acceptive of a PR that reverts #44537?

arcanis

Fwiw I don't have real approval rights in this repo, but as far as I can tell the test looks fine to me 🙂

(As for reverting, I strongly object - I made the original PR for a reason, it shouldn't be reverted)

GeoffreyBooth · 2022-10-21T16:45:50Z

(As for reverting, I strongly object - I made the original PR for a reason, it shouldn't be reverted)

Where's the suggestion for reverting?

Even if we eventually revert (not that I'm suggesting we do) it would be preferable to revert both the feature and its test together, I think, so we have the history.

test/parallel/test-vfs.js

RaisinTen · 2022-10-22T13:38:16Z

@GeoffreyBooth

Where's the suggestion for reverting?

I posted the comment about reverting in #44713 (comment) in case we are not comfortable with exposing Module._stat.

Even if we eventually revert (not that I'm suggesting we do) it would be preferable to revert both the feature and its test together, I think, so we have the history.

Yes but for that we would need to land the test first. If you take a look at the contents of #44537 you would see that it landed without any tests, which is why I thought of sending a PR to add some.

test/parallel/test-vfs.js

Signed-off-by: Darshan Sen <raisinten@gmail.com>

nodejs-github-bot · 2022-10-25T09:10:06Z

CI: https://ci.nodejs.org/job/node-test-pull-request/47458/

nodejs-github-bot · 2022-10-25T11:48:21Z

Landed in 37b8a60

Module._stat landed in #44537 without a test, so this change adds one. Signed-off-by: Darshan Sen <raisinten@gmail.com> PR-URL: #44713 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>

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module: open stat/readPackage to mutations #44537

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Research the feasibility to providing a VFS extension mechanism to fs, require(), child_process, etc nodejs/single-executable#37

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RaisinTen added 5 commits October 23, 2022 10:45

test: use common.expectWarning()

b135612

Signed-off-by: Darshan Sen <raisinten@gmail.com>

fixup! test: add comment

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fixup! test: add comment

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fixup! test: add comment

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fixup! test: add a more isolated Module._stat test

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Signed-off-by: Darshan Sen <raisinten@gmail.com>

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test: add test for `Module._stat` #44713

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