feat: try to find actual target directory to place wasi deps into

[Gentle]

Scenario: in a workspace setup, the library extracts the wasi-deps to every crate that links against libpython, this code tries to instead find the actually used cargo target directory

The code searches for the last occurrence of /wasm32-wasi/ in the OUT_DIR variable so this works also for setups where the user set the CARGO_TARGET_DIR environment variable

Example:

workspace/target <= I want the files to be put here workspace/library_a/target/wasm32-wasi/wasi-deps <= these three are currently being created workspace/library_b/target/wasm32-wasi/wasi-deps <= these three are currently being created workspace/library_c/target/wasm32-wasi/wasi-deps <= these three are currently being created

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[Gentle]

I'm sorry I had some busy weeks at work, I will add your proposed changes and thank you for reviewing

[Angelmmiguel]

No worries @Gentle, just ping us when the changes are ready. Thank you for your contribution :)

[Gentle]

I rewrote the patch, it now searches for the correct target directory in this order:

• CARGO_TARGET_DIR variable
• the first parent directory that has a Cargo.lock
• if both were not successful, fallback to the previous behavior

[Gentle]

there is a race condition with workspaces where many crates have wlr-libpy as a dependency: if two crates try to extract the same tarball at the same time, tar can error with File Already Exists.

To circumvent this, I added fslock as a dependency so we can make sure only one tar extraction runs at the same time

https://github.com/Gentle/webassembly-language-runtimes/commit/861dc47649e86c481424946e26093688fbaa45c9

should I add the diff to this PR?

[ereslibre]

Hello @Gentle,

Sorry for the long time to reply and thank you for your contribution. After some long discussions, this project is currently in the process of being archived. However, the development of this project will continue as an independent community fork present at https://github.com/webassemblylabs/webassembly-language-runtimes.

We would be grateful if you could recreate your contribution under that fork and we will work on applying it.

[Gentle]

thank you, I will move the PR