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Track "CARGO" in environment fingerprint. #9363

Merged
merged 1 commit into from
Apr 16, 2021
Merged

Track "CARGO" in environment fingerprint. #9363

merged 1 commit into from
Apr 16, 2021

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ehuss
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@ehuss ehuss commented Apr 15, 2021

There is an issue where if a package includes an env!("CARGO"), that value is not tracked in the fingerprint. If different cargos are used, it will not rebuild. This changes it so that the path to cargo will be tracked in the fingerprint if the CARGO env var is in the dep-info file.

This came up with rust's build system where it tracks the env. If you build rust once, and then change the cargo value in config.toml and try building again, it would not pick up the change which caused me some confusion.

In theory, cargo could fingerprint this every time, but I figure that could be disruptive and trigger needlessly in some situations.

This diff is a little bigger than I would like for such an obscure case. As an alternative, I think rustbuild could just print cargo:rerun-if-env-changed=CARGO, but I figure this could potentially be useful for other projects.

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Apr 15, 2021
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FWIW it was my expectation when writing that code that since Cargo tracks some of the variables it passes down (e.g., OUT_DIR, RUSTC, afaik), then this would also get tracked. I don't mind changing rustbuild to explicitly emit rebuild directives, but I do feel like this is probably a common assumption.

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@bors: r+

Seems fine to me for now. I feel like this is where Cargo's backend really shows its age and shortcomings. Ideally we'd have a Command on-hand to hash and just automatically see that CARGO changed without having to explicitly special-case it here. Unfortunately though we don't easily have that and it's implicitly assumed that fingerprinting covers everything that would go into calculating the Command for rustc (which as can be seen here is naturally buggy from time to time).

That would be a big rearchitecture of Cargo though...

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bors commented Apr 16, 2021

📌 Commit 2551535 has been approved by alexcrichton

@bors 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 Apr 16, 2021
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bors commented Apr 16, 2021

⌛ Testing commit 2551535 with merge 57b7597...

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bors commented Apr 16, 2021

☀️ Test successful - checks-actions
Approved by: alexcrichton
Pushing 57b7597 to master...

@bors bors merged commit 57b7597 into rust-lang:master Apr 16, 2021
@ehuss ehuss mentioned this pull request Apr 21, 2021
Merged
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Apr 24, 2021
@Dylan-DPC
Rollup merge of rust-lang#84412 - ehuss:update-cargo, r=ehuss
81a0355 
Update cargo, rls

## cargo

18 commits in 65d57e6f384c2317f76626eac116f683e2b63665..0ed318d182e465cd66071b91ac3d265af63ef8a1
2021-04-04 15:07:52 +0000 to 2021-04-23 20:54:54 +0000
- Restore crates.io's `SourceId` hash value to before (rust-lang/cargo#9397)
- Fix loading `branch=master` patches in the v3 lock transition (rust-lang/cargo#9392)
- Update changelog for 1.52 beta changes. (rust-lang/cargo#9396)
- Fix build-std updating the index on every build. (rust-lang/cargo#9393)
- Fix typo in profile docs (rust-lang/cargo#9386)
- Fix disagreement about lockfile ordering on stable/nightly (rust-lang/cargo#9384)
- Don't give a hard error when the end-user specifies RUSTC_BOOTSTRAP=crate_name (rust-lang/cargo#9365)
- Fix rust-lang/cargo#9350 (cargo build -Z help is missing options) (rust-lang/cargo#9369)
- an struct -> a struct (rust-lang/cargo#9379)
- Handle man pages better on Windows. (rust-lang/cargo#9378)
- fix: better error message when dependency/workspace member missing (rust-lang/cargo#9368)
- Fix typo in book (rust-lang/cargo#9376)
- Don't re-use rustc cache when RUSTC_WRAPPER changes (rust-lang/cargo#9348)
- doc: add split-debuginfo doc in config chapter (rust-lang/cargo#9372)
- refactor: remove `CargoResultExt` (rust-lang/cargo#9367)
- Track "CARGO" in environment fingerprint. (rust-lang/cargo#9363)
- Update clippy lint allow set. (rust-lang/cargo#9356)
- Fix 'suport' typo in documentation (rust-lang/cargo#9338)

## rls

3 commits in 32c0fe006dcdc13e1ca0ca31de543e4436c1299e..74d1800c25498689c5b5120a1e8495fce0cd0d0d
2021-04-12 11:21:12 +0000 to 2021-04-22 21:29:51 +0000
- Bump default integration test message timeout to 30s (rust-lang/rls#1731)
- itertools = 0.9, fst = 0.4 (rust-lang/rls#1729)
- Update cargo (rust-lang/rls#1728)
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Apr 24, 2021
@Dylan-DPC
Rollup merge of rust-lang#84412 - ehuss:update-cargo, r=ehuss
14bfb6b 
Update cargo, rls

## cargo

18 commits in 65d57e6f384c2317f76626eac116f683e2b63665..0ed318d182e465cd66071b91ac3d265af63ef8a1
2021-04-04 15:07:52 +0000 to 2021-04-23 20:54:54 +0000
- Restore crates.io's `SourceId` hash value to before (rust-lang/cargo#9397)
- Fix loading `branch=master` patches in the v3 lock transition (rust-lang/cargo#9392)
- Update changelog for 1.52 beta changes. (rust-lang/cargo#9396)
- Fix build-std updating the index on every build. (rust-lang/cargo#9393)
- Fix typo in profile docs (rust-lang/cargo#9386)
- Fix disagreement about lockfile ordering on stable/nightly (rust-lang/cargo#9384)
- Don't give a hard error when the end-user specifies RUSTC_BOOTSTRAP=crate_name (rust-lang/cargo#9365)
- Fix rust-lang/cargo#9350 (cargo build -Z help is missing options) (rust-lang/cargo#9369)
- an struct -> a struct (rust-lang/cargo#9379)
- Handle man pages better on Windows. (rust-lang/cargo#9378)
- fix: better error message when dependency/workspace member missing (rust-lang/cargo#9368)
- Fix typo in book (rust-lang/cargo#9376)
- Don't re-use rustc cache when RUSTC_WRAPPER changes (rust-lang/cargo#9348)
- doc: add split-debuginfo doc in config chapter (rust-lang/cargo#9372)
- refactor: remove `CargoResultExt` (rust-lang/cargo#9367)
- Track "CARGO" in environment fingerprint. (rust-lang/cargo#9363)
- Update clippy lint allow set. (rust-lang/cargo#9356)
- Fix 'suport' typo in documentation (rust-lang/cargo#9338)

## rls

3 commits in 32c0fe006dcdc13e1ca0ca31de543e4436c1299e..74d1800c25498689c5b5120a1e8495fce0cd0d0d
2021-04-12 11:21:12 +0000 to 2021-04-22 21:29:51 +0000
- Bump default integration test message timeout to 30s (rust-lang/rls#1731)
- itertools = 0.9, fst = 0.4 (rust-lang/rls#1729)
- Update cargo (rust-lang/rls#1728)
bors added a commit to rust-lang-ci/rust that referenced this pull request Apr 24, 2021
@bors
Auto merge of rust-lang#84412 - ehuss:update-cargo, r=ehuss
2b68027 
Update cargo, rls

## cargo

18 commits in 65d57e6f384c2317f76626eac116f683e2b63665..0ed318d182e465cd66071b91ac3d265af63ef8a1
2021-04-04 15:07:52 +0000 to 2021-04-23 20:54:54 +0000
- Restore crates.io's `SourceId` hash value to before (rust-lang/cargo#9397)
- Fix loading `branch=master` patches in the v3 lock transition (rust-lang/cargo#9392)
- Update changelog for 1.52 beta changes. (rust-lang/cargo#9396)
- Fix build-std updating the index on every build. (rust-lang/cargo#9393)
- Fix typo in profile docs (rust-lang/cargo#9386)
- Fix disagreement about lockfile ordering on stable/nightly (rust-lang/cargo#9384)
- Don't give a hard error when the end-user specifies RUSTC_BOOTSTRAP=crate_name (rust-lang/cargo#9365)
- Fix rust-lang/cargo#9350 (cargo build -Z help is missing options) (rust-lang/cargo#9369)
- an struct -> a struct (rust-lang/cargo#9379)
- Handle man pages better on Windows. (rust-lang/cargo#9378)
- fix: better error message when dependency/workspace member missing (rust-lang/cargo#9368)
- Fix typo in book (rust-lang/cargo#9376)
- Don't re-use rustc cache when RUSTC_WRAPPER changes (rust-lang/cargo#9348)
- doc: add split-debuginfo doc in config chapter (rust-lang/cargo#9372)
- refactor: remove `CargoResultExt` (rust-lang/cargo#9367)
- Track "CARGO" in environment fingerprint. (rust-lang/cargo#9363)
- Update clippy lint allow set. (rust-lang/cargo#9356)
- Fix 'suport' typo in documentation (rust-lang/cargo#9338)

## rls

3 commits in 32c0fe006dcdc13e1ca0ca31de543e4436c1299e..74d1800c25498689c5b5120a1e8495fce0cd0d0d
2021-04-12 11:21:12 +0000 to 2021-04-22 21:29:51 +0000
- Bump default integration test message timeout to 30s (rust-lang/rls#1731)
- itertools = 0.9, fst = 0.4 (rust-lang/rls#1729)
- Update cargo (rust-lang/rls#1728)
@ehuss ehuss added this to the 1.53.0 milestone Feb 6, 2022
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@ehuss @rust-highfive @Mark-Simulacrum @alexcrichton @bors @Eh2406