Fixes Dependabot::SharedHelpers::HelperSubprocessFailed - err_pnpm_un…

…supported_platform error code (#10436)

* Adds exception handler and test cases

npm_and_yarn/lib/dependabot/npm_and_yarn/file_updater/pnpm_lockfile_updater.rb

@@ -60,6 +60,12 @@ def updated_pnpm_lock_content(pnpm_lock)
 
         ERR_PNPM_PATCH_NOT_APPLIED = /ERR_PNPM_PATCH_NOT_APPLIED/
 
+        # ERR_PNPM_UNSUPPORTED_PLATFORM
+        ERR_PNPM_UNSUPPORTED_PLATFORM = /ERR_PNPM_UNSUPPORTED_PLATFORM/
+        PLATFORM_PACAKGE_DEP = /Unsupported platform for (?<dep>.*)\: wanted/
+        PLATFORM_VERSION_REQUIREMENT = /wanted {(?<supported_ver>.*)} \(current: (?<detected_ver>.*)\)/
+        PLATFORM_PACAKGE_MANAGER = "pnpm"
+
         def run_pnpm_update(pnpm_lock:)
           SharedHelpers.in_a_temporary_repo_directory(base_dir, repo_contents_path) do
             File.write(".npmrc", npmrc_content(pnpm_lock))
@@ -145,6 +151,11 @@ def handle_pnpm_lock_updater_error(error, pnpm_lock)
 
           raise_unsupported_engine_error(error_message, pnpm_lock) if error_message.match?(ERR_PNPM_UNSUPPORTED_ENGINE)
 
+          if error_message.match?(ERR_PNPM_UNSUPPORTED_PLATFORM)
+            raise_unsupported_platform_error(error_message,
+                                             pnpm_lock)
+          end
+
           raise
         end
         # rubocop:enable Metrics/AbcSize
@@ -201,6 +212,23 @@ def write_final_package_json_files
           end
         end
 
+        def raise_unsupported_platform_error(error_message, _pnpm_lock)
+          unless error_message.match(PLATFORM_PACAKGE_DEP) &&
+                 error_message.match(PLATFORM_VERSION_REQUIREMENT)
+            return
+          end
+
+          supported_version = error_message.match(PLATFORM_VERSION_REQUIREMENT)
+                                           .named_captures["supported_ver"]
+                                           .then { sanitize_message(_1) }
+          detected_version = error_message.match(PLATFORM_VERSION_REQUIREMENT)
+                                          .named_captures["detected_ver"]
+                                          .then { sanitize_message(_1) }
+
+          Dependabot.logger.warn(error_message)
+          raise Dependabot::ToolVersionNotSupported.new(PLATFORM_PACAKGE_MANAGER, supported_version, detected_version)
+        end
+
         def npmrc_content(pnpm_lock)
           NpmrcBuilder.new(
             credentials: credentials,
@@ -229,6 +257,10 @@ def base_dir
         def npmrc_file
           dependency_files.find { |f| f.name == ".npmrc" }
         end
+
+        def sanitize_message(message)
+          message.gsub(/"|\[|\]|\}|\{/, "")
+        end
       end
     end
   end

npm_and_yarn/spec/dependabot/npm_and_yarn/file_updater/pnpm_lockfile_updater_spec.rb

@@ -252,6 +252,35 @@
       end
     end
 
+    context "with a registry resolution that returns err_pnpm_unsupported_platform response" do
+      let(:dependency_name) { "@swc/core-linux-arm-gnueabihf" }
+      let(:version) { "1.7.11" }
+      let(:previous_version) { "1.3.56" }
+      let(:requirements) do
+        [{
+          file: "package.json",
+          requirement: "1.7.11",
+          groups: ["optionalDependencies"],
+          source: nil
+        }]
+      end
+      let(:previous_requirements) do
+        [{
+          file: "package.json",
+          requirement: "1.3.56",
+          groups: ["optionalDependencies"],
+          source: nil
+        }]
+      end
+
+      let(:project_name) { "pnpm/unsupported_platform" }
+
+      it "raises a helpful error" do
+        expect { updated_pnpm_lock_content }
+          .to raise_error(Dependabot::ToolVersionNotSupported)
+      end
+    end
+
     context "when there is a private repo we don't have access to and returns a 4xx error" do
       let(:project_name) { "pnpm/private_repo_no_access" }
 

npm_and_yarn/spec/fixtures/projects/pnpm/unsupported_platform/.npmrc

@@ -0,0 +1 @@
+engine-strict=true

npm_and_yarn/spec/fixtures/projects/pnpm/unsupported_platform/package.json

@@ -0,0 +1,21 @@
+{
+	"name": "test",
+	"version": "1.1.1",
+	"private": true,
+	"pnpm": {
+		"supportedArchitectures": {
+		  "os": ["win32", "darwin", "current"],
+		  "cpu": ["arm"]
+		},
+		"requiredScripts": ["build"]
+	  },
+	"dependencies": {
+	  "@blocknote/core": "^0.15.3",
+	  "@swc/core-linux-arm-gnueabihf": "1.3.56"
+	},
+	"engines": {
+	  "pnpm": ">=8.0.0 <11.0.0",
+	  "node": ">=18.0.0 <19.0.0"
+	},
+	"packageManager": "pnpm@8.4.0+sha1.73c608c602d520c436c7b250330315d83ffcc1ee"
+  }