Allow configure module download mode

Author: nvartolomei

README.md

@@ -432,6 +432,7 @@ Flags:
       --print-linter-name           Print linter name in issue line (default true)
       --issues-exit-code int        Exit code when issues were found (default 1)
       --build-tags strings          Build tags
+      --mod string                  module download mode to use: readonly or vendor (passed to go list)
       --deadline duration           Deadline for total work (default 1m0s)
       --tests                       Analyze tests (*_test.go) (default true)
       --print-resources-usage       Print avg and max memory usage of golangci-lint and total time

pkg/commands/run.go

@@ -63,6 +63,7 @@ func initFlagSet(fs *pflag.FlagSet, cfg *config.Config, m *lintersdb.Manager) {
 	fs.IntVar(&rc.ExitCodeIfIssuesFound, "issues-exit-code",
 		exitcodes.IssuesFound, wh("Exit code when issues were found"))
 	fs.StringSliceVar(&rc.BuildTags, "build-tags", nil, wh("Build tags"))
+	fs.StringVar(&rc.Mod, "mod", "", wh("module download mode to use: readonly or vendor (passed to go list)"))
 	fs.DurationVar(&rc.Deadline, "deadline", time.Minute, wh("Deadline for total work"))
 	fs.BoolVar(&rc.AnalyzeTests, "tests", true, wh("Analyze tests (*_test.go)"))
 	fs.BoolVar(&rc.PrintResourcesUsage, "print-resources-usage", false,

pkg/config/config.go

@@ -110,6 +110,7 @@ type Run struct {
 	Args []string
 
 	BuildTags []string `mapstructure:"build-tags"`
+	Mod       string   `mapstructure:"mod"`
 
 	ExitCodeIfIssuesFound int  `mapstructure:"issues-exit-code"`
 	AnalyzeTests          bool `mapstructure:"tests"`

pkg/lint/load.go

@@ -201,10 +201,17 @@ func (cl ContextLoader) loadPackages(ctx context.Context, loadMode packages.Load
 	cl.prepareBuildContext()
 
 	var buildFlags []string
+
 	if len(cl.cfg.Run.BuildTags) != 0 {
 		// go help build
 		buildFlags = []string{"-tags", strings.Join(cl.cfg.Run.BuildTags, " ")}
 	}
+
+	if cl.cfg.Run.Mod != "" {
+		// go help module
+		buildFlags = append(buildFlags, fmt.Sprintf("-mod=%s", cl.cfg.Run.Mod))
+	}
+
 	conf := &packages.Config{
 		Mode:       loadMode,
 		Tests:      cl.cfg.Run.AnalyzeTests,