run: new command

cmd/run.go

@@ -0,0 +1,64 @@
+package cmd
+
+import (
+	"errors"
+	"os/exec"
+	"strings"
+
+	"github.com/ekalinin/pbvm/utils"
+	"github.com/spf13/cobra"
+)
+
+var version string
+
+// runCmd represents the run command
+var runCmd = &cobra.Command{
+	Use:           "run <command>",
+	Args:          cobra.ExactArgs(1),
+	Short:         "Run a command under a version",
+	Long:          `Run a command under a version`,
+	SilenceUsage:  true,
+	SilenceErrors: true,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(version) < 5 {
+			return errors.New("Version is incorrect: " + version)
+		}
+
+		installed, _, err := utils.IsInstalledVersion(pbName, version)
+		if err != nil {
+			return err
+		}
+		if !installed {
+			return errors.New("Version is not installed: " + version)
+		}
+
+		originVersion, err := utils.GetActiveVersion(pbName)
+		if err != nil {
+			return err
+		}
+
+		// TODO: run command without affecting other sessions
+		// (change PATH & syscall.Exec?)
+
+		if err := utils.ActivateVersion(pbName, version); err != nil {
+			return err
+		}
+		defer utils.ActivateVersion(pbName, originVersion)
+
+		cs := strings.Split(args[0], " ")
+		command := exec.Command(cs[0], cs[1:]...)
+		out, err := command.CombinedOutput()
+		if err != nil {
+			return err
+		}
+		println(string(out))
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(runCmd)
+
+	runCmd.Flags().StringVar(&version, "version", "v",
+		"Version used for command execution")
+}

utils/utils.go

@@ -313,26 +313,34 @@ func ActivateVersion(app, version string) error {
 
 // IsActiveVersion returns bool if version is active
 func IsActiveVersion(app, version string) (bool, error) {
-	activeDir, err := GetHomeActiveDir(app)
-	if err != nil {
-		return false, err
-	}
-
-	l, err := os.Readlink(path.Join(activeDir, "bin"))
+	activeVer, err := GetActiveVersion(app)
 	if err != nil {
 		return false, err
 	}
 
-	// converting
-	// "/home/user/.pbvm/versions/v3.12.3/bin" -> "v3.12.3"
-	activeVer := path.Base(path.Dir(l))
 	if activeVer == version {
 		return true, nil
 	}
 
 	return false, nil
 }
 
+// GetActiveVersion returns active version
+func GetActiveVersion(app string) (string, error) {
+	activeDir, err := GetHomeActiveDir(app)
+	if err != nil {
+		return "", err
+	}
+
+	l, err := os.Readlink(path.Join(activeDir, "bin"))
+	if err != nil {
+		return "", err
+	}
+	// converting
+	// "/home/user/.pbvm/versions/v3.12.3/bin" -> "v3.12.3"
+	return path.Base(path.Dir(l)), nil
+}
+
 // FilterAsset finds an asset which is need to be downloaded
 func FilterAsset(release *github.RepositoryRelease) *github.ReleaseAsset {
 	arch := GetArch()