Implement lima prune --dry-run

cmd/limactl/prune.go

@@ -21,12 +21,30 @@ func newPruneCommand() *cobra.Command {
 		ValidArgsFunction: cobra.NoFileCompletions,
 	}
 
+	pruneCommand.Flags().Bool("dry-run", false, "Show which images would be deleted, but don't really delete them")
 	pruneCommand.Flags().Bool("no-digest-only", false, "Only prune images without a digest specified (\"fallback\" images usually)")
 	pruneCommand.Flags().Bool("unreferenced-only", false, "Only prune downloads not referenced in any VM")
 	return pruneCommand
 }
 
+func deletePathMaybe(path string, isDryRun bool) error {
+	if isDryRun {
+		return nil
+	}
+	err := os.RemoveAll(path)
+	if err != nil {
+		logrus.WithError(err).WithFields(logrus.Fields{
+			"path": path,
+		}).Errorf("Cannot delete directory. Skipping...")
+	}
+	return err
+}
+
 func pruneAction(cmd *cobra.Command, args []string) error {
+	pruneDryRun, err := cmd.Flags().GetBool("dry-run")
+	if err != nil {
+		return err
+	}
 	pruneWithoutDigest, err := cmd.Flags().GetBool("no-digest-only")
 	if err != nil {
 		return err
@@ -55,34 +73,28 @@ func pruneAction(cmd *cobra.Command, args []string) error {
 
 			logrus.WithFields(entryFields).Debug("cache entry")
 
+			if pruneDryRun {
+				entryFields["is_dry_run"] = pruneDryRun
+			}
+
 			// check if the cache entry is referenced
 			if refFile, refFound := files[entry.ID]; refFound {
 				if refFile.Location != entry.Location { // sanity check
-					logrus.WithFields(logrus.Fields{
-						"id":                  entry.ID,
-						"location":            entry.Location,
-						"referenced_location": refFile.Location,
-					}).Warnf("Sanity check failed! URL mismatch")
+					ef := entryFields
+					ef["referenced_location"] = refFile.Location
+					logrus.WithFields(ef).Warnf("Sanity check failed! URL mismatch")
 				}
 
 				if pruneWithoutDigest && refFile.Digest == "" {
 					// delete the fallback image entry (entry w/o digest) even if referenced
 					logrus.WithFields(entryFields).Infof("Deleting fallback entry")
-					if err := os.RemoveAll(entry.Path); err != nil {
-						logrus.WithError(err).WithFields(logrus.Fields{
-							"path": entry.Path,
-						}).Errorf("Cannot delete directory. Skipping...")
-					}
+					deletePathMaybe(entry.Path, pruneDryRun)
 				}
 			} else {
 				if pruneUnreferenced {
 					// delete the unreferenced cached entry
 					logrus.WithFields(entryFields).Infof("Deleting unreferenced entry")
-					if err := os.RemoveAll(entry.Path); err != nil {
-						logrus.WithError(err).WithFields(logrus.Fields{
-							"path": entry.Path,
-						}).Errorf("Cannot delete directory. Skipping...")
-					}
+					deletePathMaybe(entry.Path, pruneDryRun)
 				}
 			}
 		}
@@ -95,8 +107,11 @@ func pruneAction(cmd *cobra.Command, args []string) error {
 		return err
 	}
 	cacheDir := filepath.Join(ucd, "lima")
-	logrus.Infof("Pruning everything in %q", cacheDir)
-	return os.RemoveAll(cacheDir)
+	logrus.WithFields(logrus.Fields{
+		"is_dry_run": pruneDryRun,
+		"location":   cacheDir,
+	}).Infof("Pruning entire cache")
+	return deletePathMaybe(cacheDir, pruneDryRun)
 }
 
 // Collect all downloads referenced in VM definitions and templates