build-rust-crate: ensure info about build.rs failures reaches the log#190592
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When execution of a `build.rs` script fails, information about the failure is sent to stdout (using "cargo:foo=" prefixes) rather than stderr. Because of this, information needed to diagnose the failure is not available in `nix log`. An example of that information is found below. Let's do the simplest thing possible, and replace `>` with `tee` so the output of executing `build.rs` gets copied to the log. cargo:warning=Could not run `"pkg-config" "--libs" "--cflags" "cairo" "cairo >= 1.14"` The pkg-config command could not be found. Most likely, you need to install a pkg-config package for your OS. Try `apt install pkg-config`, or `yum install pkg-config`, or `pkg install pkg-config` depending on your distribution. If you've already installed it, ensure the pkg-config command is one of the directories in the PATH environment variable. If you did not expect this build to link to a pre-installed system library, then check documentation of the cairo-sys-rs crate for an option to build the library from source, or disable features or dependencies that require pkg-config.
bjornfor
reviewed
Sep 11, 2022
| # build script failures are reported to stdout rather than stderr, so we | ||
| # use tee here instead of > to ensure that `nix log` contains useful | ||
| # information when a failure occurs | ||
| target/build/${crateName}/build_script_build | tee target/build/${crateName}.opt |
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Is this script snippet run with "set -o pipefail"? If it isn't, then the pipe will suppress failures.
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Thank you for noticing that. How embarrassing. What I wrote would have silently omitted features when the build script fails.
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Description of changes
When execution of a
build.rsscript fails, information about the failure is sent to stdout (using "cargo:foo=" prefixes) rather than stderr. Because of this, information needed to diagnose the failure is not available innix log. An example of that information is found below.Let's do the simplest thing possible, and replace
>withteeso the output of executingbuild.rsgets copied to the log.Things done
sandbox = trueset innix.conf? (See Nix manual)nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage./result/bin/)nixos/doc/manual/md-to-db.shto update generated release notes