fails trying to build skia-bindings crate that isn't required

[brianmay]

Project dir: https://github.com/brianmay/robotica-rust/tree/b772cea414f261da0096d96b1ee37fe2ca6a1ec7

error: builder for '/nix/store/f2zbmxj2bph4393nx5jlyjj6iz83423a-crate-skia-bindings-0.58.0.drv' failed with exit code 101;
       last 10 log lines:
       >   cargo:rerun-if-env-changed=SKIA_NINJA_COMMAND
       >   cargo:rerun-if-env-changed=SKIA_GN_COMMAND
       >   Probing 'python'
       >   Python 3 found: "python"
       >   Synchronizing Skia dependencies
       >   DOWNLOADING: https://codeload.github.com/rust-skia/skia/tar.gz/m109-0.57.1
       >
       >   --- stderr
       >   thread 'main' panicked at 'Failed to download https://codeload.github.com/rust-skia/skia/tar.gz/m109-0.57.1 (https://codeload.github.com/rust-skia/skia/tar.gz/m109-0.57.1: Dns Failed: resolve dns name 'codeload.github.com:443': failed to lookup address information: Temporary failure in name resolution)', build_support/binary_cache/download.rs:68:35
       >   note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
       For full logs, run 'nix log /nix/store/f2zbmxj2bph4393nx5jlyjj6iz83423a-crate-skia-bindings-0.58.0.drv'.
error: 1 dependencies of derivation '/nix/store/fajkyqznd8jb04kwz8jv430kwkl2krxz-crate-skia-safe-0.58.0.drv' failed to build
error: 1 dependencies of derivation '/nix/store/00vgbsxgvkcbq31yrjfjwij2j71lkhvs-crate-i-slint-renderer-skia-0.3.5.drv' failed to build
error: 1 dependencies of derivation '/nix/store/13w9gkc12c1h6drsykk0l0mqcviaiv9r-crate-i-slint-backend-winit-0.3.5.drv' failed to build
error: 1 dependencies of derivation '/nix/store/gyxan3r5m0kfhx7h8vl6mk1kba05qcyn-crate-i-slint-backend-selector-0.3.5.drv' failed to build
error: 1 dependencies of derivation '/nix/store/v7s8i3yzq380jyb73fl6s206az783g0l-crate-slint-0.3.5.drv' failed to build
error: 1 dependencies of derivation '/nix/store/kzwjchdiw800vgj1p73krcngpbpqkba2-crate-robotica-slint-0.1.0.drv' failed to build

But that crate normally should not be required by this project:

$ cargo tree  -p robotica-slint  | grep skia-bindings
<no matches>

Not sure where to go from here. I think skia isn't packaged in nix, but I don't really need it either.

[psionic-k]

Looks like a built-time network fetch, which fails due to sandbox.

If you indeed don't need skia bindings, the workaround is probably to eliminate that dependency manually by patching your Cargo.nix. You can just remove it from all depednencies lists.

Underlying issue could be platform dependencies, which are not encoded in the Cargo.nix expressions yet (currently working on this).

In case you need skia, you need to do an override to fix the build script to succeed in the cargo2nix nix builder (mkcrate.nix). The build script for the skia bindings crate seems to support SKIA_LIBRARY_SEARCH_PATH to explicitly provide it. An override could likely avoid the network attempt if it provided the lib and then the package config hook enabled discovery without setting SKIA_LIBRARY_SEARCH_PATH