clippy: warn `disallowed_methods` for `std::env::var` and friends #11828

weihanglo · 2023-03-10T12:44:19Z

What does this PR try to resolve?

In #11588 we want to avoid reading from environment variables, #11727 did that well. I wonder if we could leverage tools to help with this. Thankfully, clippy has a disallowed_methods lint, helping us enforce the rule.

I am trying to dogfood tools from rust-lang org :)

How should we test and review this PR?

Before staring a review, let's make decisions on these topics.

We need to scrutinize each usage of std::env::var and std::env::var_os. Please review comments above each usage of those.

Additional information

Some variables are read from snapshot starting from #11727 might need double checks. See #11588 (comment).

rustbot · 2023-03-10T12:44:24Z

r? @ehuss

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src/cargo/ops/fix.rs

src/cargo/util/profile.rs

src/cargo/core/features.rs

weihanglo

I think we need to make decisions on these things (in this order):

Should we leverage clippy::disallowed_methods in our codebase?
Do we want to have a centralized place for exceptions of env var access?

src/cargo/core/compiler/custom_build.rs

src/cargo/core/compiler/fingerprint/mod.rs

epage · 2023-03-10T17:04:12Z

Should we leverage clippy::disallowed_methods in our codebase?

I think it can be a useful tool

Do we want to have a centralized place for exceptions of env var access?

I lean towards "no" but am fine if we do end up centralizing. Its also something we can always change later with minimal impact, so its not a big deal either way.

weihanglo · 2023-03-10T17:16:41Z

Before starting the scrutiny of all environment variable access. Let's see if we agree on this:

@rfcbot poll T-cargo "Should we leverage clippy::disallowed_methods in our codebase?"

rfcbot · 2023-03-10T17:16:42Z

Team member @weihanglo has asked teams: T-cargo, for consensus on:

"Should we leverage clippy::disallowed_methods in our codebase?"

bors · 2023-03-17T02:12:03Z

☔ The latest upstream changes (presumably #11824) made this pull request unmergeable. Please resolve the merge conflicts.

In 11588 we want to avoid reading from environment variables, 11727 did that well. I wonder if we could leverage tools to help with this. Thankfully, clippy has a `disallowed_methods`[1] lint, helping us enforce the rule. [1]: https://rust-lang.github.io/rust-clippy/stable/index.html#disallowed_methods

See comments above for each usage about why it is allowed.

weihanglo · 2023-03-17T13:01:12Z

src/cargo/core/compiler/fingerprint/mod.rs

+    fn from_env<K: AsRef<str>>(key: K) -> LocalFingerprint {
+        let key = key.as_ref();
+        let var = key.to_owned();
+        let val = env::var(key).ok();


Confirmed that on the current master cargo, when changing variable inside [env] config table, build script won't rerun.

weihanglo · 2023-03-17T13:03:34Z

This is ready to review. The examination of all usages of Config::get_env{_os} will come as a follow-up PR.

build.rs

epage · 2023-03-17T18:37:44Z

@bors r+

bors · 2023-03-17T18:37:46Z

📌 Commit 1071cce has been approved by epage

It is now in the queue for this repository.

bors · 2023-03-17T18:37:53Z

⌛ Testing commit 1071cce with merge 99ad42d...

bors · 2023-03-17T19:24:51Z

☀️ Test successful - checks-actions
Approved by: epage
Pushing 99ad42d to master...

Update cargo 11 commits in 4a3c588b1f0a8e2dc8dd8789dbf3b6a71b02ed49..15d090969743630bff549a1b068bcaa8174e5ee3 2023-03-14 14:05:36 +0000 to 2023-03-21 17:54:28 +0000 - docs(contrib): Move higher level resolver docs into doc comments (rust-lang/cargo#11870) - docs(contrib): Pull impl info out of architecture (rust-lang/cargo#11869) - Update curl-sys (rust-lang/cargo#11871) - Poll loop fixes (rust-lang/cargo#11624) - clippy: warn `disallowed_methods` for `std::env::var` and friends (rust-lang/cargo#11828) - Add --ignore-rust-version flag to cargo install (rust-lang/cargo#11859) - Handle case mismatches when looking up env vars in the Config snapshot (rust-lang/cargo#11824) - align semantics of generated vcs ignore files (rust-lang/cargo#11855) - Add more information to wait-for-publish (rust-lang/cargo#11713) - docs: Address warnings (rust-lang/cargo#11856) - docs(contrib): Create a file overview in the nightly docs (rust-lang/cargo#11850)

rustbot assigned ehuss Mar 10, 2023

weihanglo force-pushed the clippy-disallowed-methods branch 2 times, most recently from a00a551 to 290c0dd Compare March 10, 2023 13:06

rustbot added the A-configuration Area: cargo config files and env vars label Mar 10, 2023

epage reviewed Mar 10, 2023

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weihanglo commented Mar 10, 2023

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weihanglo added the T-cargo Team: Cargo label Mar 10, 2023

weihanglo force-pushed the clippy-disallowed-methods branch from 290c0dd to f78d081 Compare March 17, 2023 12:52

rustbot added the A-cli Area: Command-line interface, option parsing, etc. label Mar 17, 2023

weihanglo and others added 2 commits March 17, 2023 12:57

clippy: allow usages of std::env::var family by exceptions

5ccca80

See comments above for each usage about why it is allowed.

refactor(fix): Clarify env variable names are internal

1071cce

weihanglo force-pushed the clippy-disallowed-methods branch from f78d081 to 5ccca80 Compare March 17, 2023 12:58

weihanglo marked this pull request as ready for review March 17, 2023 12:58

weihanglo commented Mar 17, 2023

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weihanglo changed the title ~~clippy: warn on disallowed_methods std::env::{var,var_os}~~ clippy: warn disallowed_methods for std::env::var and friends Mar 17, 2023

epage reviewed Mar 17, 2023

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bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 17, 2023

bors merged commit 99ad42d into rust-lang:master Mar 17, 2023

weihanglo deleted the clippy-disallowed-methods branch March 18, 2023 06:42

0xPoe mentioned this pull request Mar 18, 2023

Make clippy happy #11867

Closed

weihanglo mentioned this pull request Mar 21, 2023

Update cargo rust-lang/rust#109463

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ehuss added this to the 1.70.0 milestone Mar 26, 2023

weihanglo mentioned this pull request Apr 24, 2023

Avoid directly reading environment variables #11588

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What does this PR try to resolve?

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clippy: warn `disallowed_methods` for `std::env::var` and friends #11828

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