fix: cli command to unlock the autorestic running value (#329)

* fix: cli command to unlock the autorestic running value

* fix(unlock cmd): get user confirmation in case an instance is still running

* fix(cmd unlock): add force flag

cmd/unlock.go

@@ -0,0 +1,79 @@
+package cmd
+
+import (
+	"bytes"
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"github.com/cupcakearmy/autorestic/internal"
+	"github.com/cupcakearmy/autorestic/internal/colors"
+	"github.com/cupcakearmy/autorestic/internal/lock"
+	"github.com/spf13/cobra"
+)
+
+var unlockCmd = &cobra.Command{
+	Use:   "unlock",
+	Short: "Unlock autorestic only if you are sure that no other instance is running",
+	Long: `Unlock autorestic only if you are sure that no other instance is running.
+To check you can run "ps aux | grep autorestic".`,
+	Run: func(cmd *cobra.Command, args []string) {
+		internal.GetConfig()
+
+		force, _ := cmd.Flags().GetBool("force")
+
+		if !force && isAutoresticRunning() {
+			colors.Error.Print("Another autorestic instance is running. Are you sure you want to unlock? (yes/no): ")
+			var response string
+			fmt.Scanln(&response)
+			if strings.ToLower(response) != "yes" {
+				colors.Primary.Println("Unlocking aborted.")
+				return
+			}
+		}
+
+		err := lock.Unlock()
+		if err != nil {
+			colors.Error.Println("Could not unlock:", err)
+			return
+		}
+
+		colors.Success.Println("Unlock successful")
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(unlockCmd)
+	unlockCmd.Flags().Bool("force", false, "force unlock")
+}
+
+// isAutoresticRunning checks if autorestic is running
+// and returns true if it is.
+// It also prints the processes to stdout.
+func isAutoresticRunning() bool {
+	cmd := exec.Command("sh", "-c", "ps aux | grep autorestic")
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	err := cmd.Run()
+	if err != nil {
+		return false
+	}
+
+	lines := strings.Split(out.String(), "\n")
+	autoresticProcesses := []string{}
+
+	for _, line := range lines {
+		if strings.Contains(line, "autorestic") && !strings.Contains(line, "grep autorestic") {
+			autoresticProcesses = append(autoresticProcesses, line)
+		}
+	}
+
+	if len(autoresticProcesses) > 0 {
+		colors.Faint.Println("Found autorestic processes:")
+		for _, proc := range autoresticProcesses {
+			colors.Faint.Println(proc)
+		}
+		return true
+	}
+	return false
+}

docs/pages/cli/unlock.md

@@ -0,0 +1,32 @@
+# Unlock
+
+In case autorestic throws the error message `an instance is already running. exiting`, but there is no instance running you can unlock the lock.
+
+To verify that there is no instance running you can use `ps aux | grep autorestic`.
+
+Example with no instance running:
+
+```bash
+> ps aux | grep autorestic
+root       39260  0.0  0.0   6976  2696 pts/11   S+   19:41   0:00 grep autorestic
+```
+
+Example with an instance running:
+
+```bash
+> ps aux | grep autorestic
+root       29465  0.0  0.0 1162068 7380 pts/7    Sl+  19:28   0:00 autorestic --ci backup -a
+root       39260  0.0  0.0   6976  2696 pts/11   S+   19:41   0:00 grep autorestic
+```
+
+**If an instance is running you should not unlock as it could lead to data loss!**
+
+```bash
+autorestic unlock
+```
+
+Use the `--force` to prevent the confirmation prompt if an instance is running.
+
+```bash
+autorestic unlock --force
+```