Fixes issues with Dependabot::SharedHelpers::HelperSubprocessFailed -…

… Python (#10615)

* adds exception handlers for poetry

python/lib/dependabot/python/update_checker/poetry_version_resolver.rb

@@ -338,6 +338,15 @@ def normalise(name)
     class PoetryErrorHandler < UpdateChecker
       extend T::Sig
 
+      # if a valid config value is not found in project.toml file
+      INVALID_CONFIGURATION = /The Poetry configuration is invalid:(?<config>.*)/
+
+      # if .toml has incorrect version specification i.e. <0.2.0app
+      INVALID_VERSION = /Could not parse version constraint: (?<ver>.*)/
+
+      # dependency source link not accessible
+      INVALID_LINK = /No valid distribution links found for package: "(?<dep>.*)" version: "(?<ver>.*)"/
+
       sig do
         params(
           dependencies: Dependabot::Dependency,
@@ -361,9 +370,14 @@ def initialize(dependencies:, dependency_files:)
 
       sig { params(error: Exception).void }
       def handle_poetry_error(error)
-        return true unless (msg = error.message.match(PoetryVersionResolver::INCOMPATIBLE_CONSTRAINTS))
+        Dependabot.logger.warn(error.message)
 
-        raise DependencyFileNotResolvable, msg
+        if (msg = error.message.match(PoetryVersionResolver::INCOMPATIBLE_CONSTRAINTS) ||
+            error.message.match(INVALID_CONFIGURATION) || error.message.match(INVALID_VERSION) ||
+            error.message.match(INVALID_LINK))
+
+          raise DependencyFileNotResolvable, msg
+        end
       end
     end
   end

python/spec/dependabot/python/update_checker/poetry_version_resolver_spec.rb

@@ -395,5 +395,48 @@
         end
       end
     end
+
+    context "with invalid configuration in pyproject.toml file" do
+      let(:response) do
+        "The Poetry configuration is invalid:
+      - data.group.dev.dependencies.h5 must be valid exactly by one definition (0 matches found)"
+      end
+
+      it "raises a helpful error" do
+        expect { poetry_error_handler }.to raise_error(Dependabot::DependencyFileNotResolvable) do |error|
+          expect(error.message)
+            .to include("The Poetry configuration is invalid")
+        end
+      end
+    end
+
+    context "with invalid version for dependency mentioned in pyproject.toml file" do
+      let(:response) do
+        "Resolving dependencies...
+        Could not parse version constraint: <0.2.0app"
+      end
+
+      it "raises a helpful error" do
+        expect { poetry_error_handler }.to raise_error(Dependabot::DependencyFileNotResolvable) do |error|
+          expect(error.message)
+            .to include("Could not parse version constraint: <0.2.0app")
+        end
+      end
+    end
+
+    context "with invalid dependency source link in pyproject.toml file" do
+      let(:response) do
+        "Updating dependencies
+        Resolving dependencies...
+        No valid distribution links found for package: \"llama-cpp-python\" version: \"0.2.82\""
+      end
+
+      it "raises a helpful error" do
+        expect { poetry_error_handler }.to raise_error(Dependabot::DependencyFileNotResolvable) do |error|
+          expect(error.message)
+            .to include("No valid distribution links found for package: \"llama-cpp-python\" version: \"0.2.82\"")
+        end
+      end
+    end
   end
 end