Add --overwrite to wwctl overlay import

- Closes: #386

Signed-off-by: Timothy Middelkoop <tmiddelkoop@internet2.edu>

CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## v4.6.1, unreleased
 
+### Added
+
+- Added `wwctl overlay import --overwrite` to overwrite existing overlay file.
+
 ### Fixed
 
 - Fixed panic in warewulfd if node netdev is only defined in a profile. #1817

internal/app/wwctl/overlay/imprt/main.go

@@ -42,7 +42,7 @@ func CobraRunE(cmd *cobra.Command, args []string) (err error) {
 		dest = path.Join(dest, path.Base(source))
 	}
 
-	if util.IsFile(overlay_.File(dest)) {
+	if !OverwriteFile && util.IsFile(overlay_.File(dest)) {
 		return fmt.Errorf("a file with that name already exists in the overlay: %s", overlayName)
 	}
 

internal/app/wwctl/overlay/imprt/root.go

@@ -24,12 +24,14 @@ var (
 			}
 		},
 	}
+	OverwriteFile   bool
 	NoOverlayUpdate bool
 	CreateDirs      bool
 	Workers         int
 )
 
 func init() {
+	baseCmd.PersistentFlags().BoolVarP(&OverwriteFile, "overwrite", "o", false, "Overwrite file if exists")
 	baseCmd.PersistentFlags().BoolVarP(&NoOverlayUpdate, "noupdate", "n", false, "Don't update overlays")
 	baseCmd.PersistentFlags().BoolVarP(&CreateDirs, "parents", "p", false, "Create any necessary parent directories")
 	baseCmd.PersistentFlags().IntVar(&Workers, "workers", 0, "The number of parallel workers building overlays (<=0 indicates 1 worker per CPU)")