commit ec5fd40164f7ab09083bb539f6b77241ca873efe
author UebelAndre <github@uebelandre.com> Fri Oct 27 05:20:44 2023 -0700
committer GitHub <noreply@github.com> Fri Oct 27 05:20:44 2023 -0700
tree ba8a135a29f57e1a088d2b2f766de2292302a6da
parent 15572051f0a7c3c83d1cd73de72c8110729db4d8

Fix issues causing the `Rustc` process wrapper to be built non-determ… (#2216)

This change aims to ensure the process wrapper is built
determinisitically, thus reducing churn in cases where multiple
developers share a bazel remote cache. The shared cache is notable as
the binaries can be deterministically produced for a single user for a
single checkout as some host information is embedded in the compiled
binaries. The host information is stored in the `debug-info` section of
the executable. This can be resolved by stripping it. The other issue of
determinism is `rust_binary_without_process_wrapper` does not resolve
`${pwd}` like the process wrapper does, thus stripping sandbox paths
from rustc outputs. To solve for this a small bash and batch script was
added to account for this behavior. The intent of these scripts is to
use __no__ host executables and instead rely on pure bash and batch to
accomplish this and keep any actions which use this as hermetic as
possible.


The following tables were produced on macOS. Note that `rules_rust_2` is
simply another checkout of `rules_rust` on the same commit

Before the changes in this PR:

| path | rules_rust sha256 | rules_rust_2 sha256 |
| --- | --- | --- |
|
bazel-out/darwin_arm64-opt-exec-2B5CBBC6/bin/external/rules_rust_tinyjson/libtinyjson-4031717389.rlib
| 60db194b3e98b67cc0702c6b6c48c5bc8fcf7d723f3ece6a7a24a53888158c7e |
3eac0b443ba160e3a1bde3b023f4e953bb9fc9722e430b5ded6dbb723bc2b532 |
|
bazel-out/darwin_arm64-opt-exec-2B5CBBC6/bin/util/process_wrapper/process_wrapper
| 32e7840602c977b76bba0bc39da768d35db3e7a17dbf96e455727be2b2f0151f |
0d248279bbc9b17be5914b41a66759f939ef4da77f8a40a5ce6fa3bf339648ad |

After the changes:

| path | rules_rust sha256 | rules_rust_2 sha256 |
| --- | --- | --- |
|
bazel-out/darwin_arm64-opt-exec-2B5CBBC6/bin/external/rules_rust_tinyjson/libtinyjson-4031717389.rlib
| 07432f5d207da854266ccde212243c67c29907f81a7619434ce9f608b1658d96 |
07432f5d207da854266ccde212243c67c29907f81a7619434ce9f608b1658d96 |
|
bazel-out/darwin_arm64-opt-exec-2B5CBBC6/bin/util/process_wrapper/process_wrapper
| cbf17392338aabfc942d975f95a49a67b731c5e597a7d27e3d9cf4d4a06b8f2c |
cbf17392338aabfc942d975f95a49a67b731c5e597a7d27e3d9cf4d4a06b8f2c |

closes https://github.com/bazelbuild/rules_rust/issues/2092