buildRustPackage: factor out install phase to cargoInstallHook

pkgs/build-support/rust/hooks/cargo-build-hook.sh

@@ -17,16 +17,16 @@ cargoBuildHook() {
       cargo build -j $NIX_BUILD_CORES \
         --target @rustTargetPlatformSpec@ \
         --frozen \
-        ${cargoBuildType} \
+        --${cargoBuildType} \
         ${cargoBuildFlags}
     )
 
-    runHook postBuild
-
     if [ ! -z "${buildAndTestSubdir-}" ]; then
         popd
     fi
 
+    runHook postBuild
+
     echo "Finished cargoBuildHook"
 }
 

pkgs/build-support/rust/hooks/cargo-install-hook.sh

@@ -0,0 +1,49 @@
+cargoInstallPostBuildHook() {
+    echo "Executing cargoInstallPostBuildHook"
+
+    releaseDir=target/@shortTarget@/$cargoBuildType
+    tmpDir="${releaseDir}-tmp";
+
+    mkdir -p $tmpDir
+    cp -r ${releaseDir}/* $tmpDir/
+    bins=$(find $tmpDir \
+      -maxdepth 1 \
+      -type f \
+      -executable ! \( -regex ".*\.\(so.[0-9.]+\|so\|a\|dylib\)" \))
+
+    echo "Finished cargoInstallPostBuildHook"
+}
+
+cargoInstallHook() {
+    echo "Executing cargoInstallHook"
+
+    runHook preInstall
+
+    # rename the output dir to a architecture independent one
+
+    releaseDir=target/@shortTarget@/$cargoBuildType
+    tmpDir="${releaseDir}-tmp";
+
+    mapfile -t targets < <(find "$NIX_BUILD_TOP" -type d | grep "${tmpDir}$")
+    for target in "${targets[@]}"; do
+      rm -rf "$target/../../${cargoBuildType}"
+      ln -srf "$target" "$target/../../"
+    done
+    mkdir -p $out/bin $out/lib
+
+    xargs -r cp -t $out/bin <<< $bins
+    find $tmpDir \
+      -maxdepth 1 \
+      -regex ".*\.\(so.[0-9.]+\|so\|a\|dylib\)" \
+      -print0 | xargs -r -0 cp -t $out/lib
+    rmdir --ignore-fail-on-non-empty $out/lib $out/bin
+    runHook postInstall
+
+    echo "Finished cargoInstallHook"
+}
+
+
+if [ -z "${installPhase-}" ]; then
+  installPhase=cargoInstallHook
+  postBuildHooks+=(cargoInstallPostBuildHook)
+fi

pkgs/build-support/rust/hooks/default.nix

@@ -36,6 +36,15 @@ in {
       };
     } ./cargo-build-hook.sh) {};
 
+  cargoInstallHook = callPackage ({ }:
+    makeSetupHook {
+      name = "cargo-install-hook.sh";
+      deps = [ ];
+      substitutions = {
+        inherit shortTarget;
+      };
+    } ./cargo-install-hook.sh) {};
+
   cargoSetupHook = callPackage ({ }:
     makeSetupHook {
       name = "cargo-setup-hook.sh";