Add git command

commands/git.go

@@ -0,0 +1,36 @@
+package commands
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"gopkg.in/src-d/go-billy.v4/osfs"
+	"gopkg.in/src-d/go-git.v4"
+	"gopkg.in/src-d/go-git.v4/storage/filesystem"
+)
+
+func init() {
+	rootCmd.AddCommand(gitCmd)
+}
+
+var gitCmd = &cobra.Command{
+	Use:   "git",
+	Short: "Print the git HEAD",
+	Long:  `tbd`,
+	Args:  cobra.ExactValidArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		worktree := osfs.New(args[0])
+		gitdir, err := worktree.Chroot(".git")
+		if err != nil {
+			panic(err)
+		}
+
+		storer := filesystem.NewStorage(gitdir, nil)
+		repository, err := git.Open(storer, worktree)
+		if err != nil {
+			panic(err)
+		}
+
+		fmt.Println(repository.Head())
+	},
+}

go.mod

@@ -21,7 +21,8 @@ require (
 	golang.org/x/time v0.0.0-20190921001708-c4c64cad1fd0 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
-	gopkg.in/src-d/go-git.v4 v4.13.1 // indirect
+	gopkg.in/src-d/go-billy.v4 v4.3.2
+	gopkg.in/src-d/go-git.v4 v4.13.1
 	k8s.io/api v0.0.0-20190503184017-f1b257a4ce96 // indirect
 	k8s.io/apimachinery v0.0.0-20190223001710-c182ff3b9841
 	k8s.io/client-go v8.0.0+incompatible