buildRustCrate: Replace hyphen with underscore in env variables (#88054)

* Add test case for include dir
* buildRustCrate: replace hyphen with underscore in env

This fixes a bug that prevents encoding_c from building.

2 files changed, 36 insertions, 2 deletions

diff --git a/pkgs/build-support/rust/build-rust-crate/configure-crate.nix b/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
index ed810053709..c47bc00938c 100644
--- a/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
+++ b/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
@@ -179,9 +179,9 @@ in ''
        export $env
      done
 
-     CRATENAME=$(echo ${crateName} | sed -e "s/\(.*\)-sys$/\U\1/")
+     CRATENAME=$(echo ${crateName} | sed -e "s/\(.*\)-sys$/\U\1/" -e "s/-/_/g")
      grep -P "^cargo:(?!(rustc-|warning=|rerun-if-changed=|rerun-if-env-changed))" target/build/${crateName}.opt \
-       | sed -e "s/cargo:\([^=]*\)=\(.*\)/export DEP_$(echo $CRATENAME)_\U\1\E=\2/" > target/env
+       | awk -F= "/^cargo:/ { sub(/^cargo:/, \"\", \$1); gsub(/-/, \"_\", \$1); print \"export \" toupper(\"DEP_$(echo $CRATENAME)_\" \$1) \"=\" \$2 }" > target/env
      set -e
   fi
   runHook postConfigure
diff --git a/pkgs/build-support/rust/build-rust-crate/test/default.nix b/pkgs/build-support/rust/build-rust-crate/test/default.nix
index 5597e4b0dd6..bdd6c86d5f0 100644
--- a/pkgs/build-support/rust/build-rust-crate/test/default.nix
+++ b/pkgs/build-support/rust/build-rust-crate/test/default.nix
@@ -344,6 +344,40 @@ let
         buildTests = true;
         expectedTestOutputs = [ "test baz_false ... ok" ];
       };
+      # Regression test for https://github.com/NixOS/nixpkgs/pull/88054
+      # Build script output should be rewritten as valid env vars.
+      buildScriptIncludeDirDeps = let
+        depCrate = mkCrate {
+          crateName = "bar";
+          src = symlinkJoin {
+            name = "build-script-and-include-dir-bar";
+            paths = [
+              (mkFile  "src/lib.rs" ''
+                fn main() { }
+              '')
+              (mkFile  "build.rs" ''
+                use std::path::PathBuf;
+                fn main() { println!("cargo:include-dir={}/src", std::env::current_dir().unwrap_or(PathBuf::from(".")).to_str().unwrap()); }
+              '')
+            ];
+          };
+        };
+      in {
+        crateName = "foo";
+        src = symlinkJoin {
+          name = "build-script-and-include-dir-foo";
+          paths = [
+            (mkFile  "src/main.rs" ''
+              fn main() { }
+            '')
+            (mkFile  "build.rs" ''
+              fn main() { assert!(std::env::var_os("DEP_BAR_INCLUDE_DIR").is_some()); }
+            '')
+          ];
+        };
+        buildDependencies = [ depCrate ];
+        dependencies = [ depCrate ];
+      };
       # Regression test for https://github.com/NixOS/nixpkgs/issues/74071
       # Whenevever a build.rs file is generating files those should not be overlayed onto the actual source dir
       buildRsOutDirOverlay = {