fix(Go mod): detect when remote end hangs up

go_modules/lib/dependabot/go_modules/file_updater/go_mod_updater.rb

@@ -21,6 +21,7 @@ class GoModUpdater
         ].freeze
 
         REPO_RESOLVABILITY_ERROR_REGEXES = [
+          /fatal: The remote end hung up unexpectedly/,
           /repository '.+' not found/,
           # (Private) module could not be fetched
           /go: .*: git fetch .*: exit status 128/.freeze,

go_modules/spec/dependabot/go_modules/file_updater/go_mod_updater_spec.rb

@@ -283,6 +283,30 @@
       end
     end
 
+    context "when the remote end hangs up unexpectedly" do
+      let(:dependency_name) { "github.com/spf13/viper" }
+      let(:dependency_version) { "v1.7.1" }
+      let(:dependency_previous_version) { "v1.7.1" }
+      let(:requirements) { [] }
+      let(:previous_requirements) { [] }
+      let(:exit_status) { double(status: 128, success?: false) }
+      let(:stderr) do
+        <<~ERROR
+          go: github.com/spf13/[email protected] requires
+          	github.com/grpc-ecosystem/[email protected] requires
+          	gopkg.in/[email protected]: invalid version: git fetch --unshallow -f origin in /opt/go/gopath/pkg/mod/cache/vcs/sha1: exit status 128:
+          	fatal: The remote end hung up unexpectedly
+        ERROR
+      end
+
+      before do
+        allow(Open3).to receive(:capture3).and_call_original
+        allow(Open3).to receive(:capture3).with(anything, "go get -d").and_return(["", stderr, exit_status])
+      end
+
+      it { expect { subject }.to raise_error(Dependabot::DependencyFileNotResolvable, /The remote end hung up/) }
+    end
+
     context "for an explicit indirect dependency" do
       let(:project_name) { "indirect" }
       let(:dependency_name) { "github.com/mattn/go-isatty" }