add command 'golangci-lint config path'

pkg/commands/config.go

@@ -0,0 +1,51 @@
+package commands
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/viper"
+
+	"github.com/golangci/golangci-lint/pkg/exitcodes"
+	"github.com/golangci/golangci-lint/pkg/fsutils"
+
+	"github.com/spf13/cobra"
+)
+
+func (e *Executor) initConfig() {
+	cmd := &cobra.Command{
+		Use:   "config",
+		Short: "Config",
+		Run: func(cmd *cobra.Command, args []string) {
+			if err := cmd.Help(); err != nil {
+				e.log.Fatalf("Can't run help: %s", err)
+			}
+		},
+	}
+	e.rootCmd.AddCommand(cmd)
+
+	pathCmd := &cobra.Command{
+		Use:   "path",
+		Short: "Print used config path",
+		Run:   e.executePathCmd,
+	}
+	e.initRunConfiguration(pathCmd) // allow --config
+	cmd.AddCommand(pathCmd)
+
+}
+
+func (e Executor) executePathCmd(cmd *cobra.Command, args []string) {
+	usedConfigFile := viper.ConfigFileUsed()
+	if usedConfigFile == "" {
+		e.log.Warnf("No config file detected")
+		os.Exit(exitcodes.NoConfigFileDetected)
+	}
+
+	usedConfigFile, err := fsutils.ShortestRelPath(usedConfigFile, "")
+	if err != nil {
+		e.log.Warnf("Can't pretty print config file path: %s", err)
+	}
+
+	fmt.Println(usedConfigFile)
+	os.Exit(0)
+}

pkg/commands/executor.go

@@ -55,6 +55,7 @@ func NewExecutor(version, commit, date string) *Executor {
 	e.initRun()
 	e.initHelp()
 	e.initLinters()
+	e.initConfig()
 
 	// init e.cfg by values from config: flags parse will see these values
 	// like the default ones. It will overwrite them only if the same option

pkg/commands/help.go

@@ -22,7 +22,7 @@ func (e *Executor) initHelp() {
 			}
 		},
 	}
-	e.rootCmd.AddCommand(helpCmd)
+	e.rootCmd.SetHelpCommand(helpCmd)
 
 	lintersHelpCmd := &cobra.Command{
 		Use:   "linters",

pkg/exitcodes/exitcodes.go

@@ -1,12 +1,13 @@
 package exitcodes
 
 const (
-	Success       = 0
-	IssuesFound   = 1
-	WarningInTest = 2
-	Failure       = 3
-	Timeout       = 4
-	NoGoFiles     = 5
+	Success              = 0
+	IssuesFound          = 1
+	WarningInTest        = 2
+	Failure              = 3
+	Timeout              = 4
+	NoGoFiles            = 5
+	NoConfigFileDetected = 6
 )
 
 type ExitError struct {