added wwctl clean to remove cache/dead overlays

Signed-off-by: Christian Goll <cgoll@suse.com>

internal/pkg/api/clean/Clean.go

@@ -0,0 +1,47 @@
+package clean
+
+import (
+	"os"
+	"path"
+
+	_ "golang.org/x/exp/slices"
+
+	warewulfconf "github.com/warewulf/warewulf/internal/pkg/config"
+	"github.com/warewulf/warewulf/internal/pkg/node"
+	"github.com/warewulf/warewulf/internal/pkg/util"
+	"github.com/warewulf/warewulf/internal/pkg/wwlog"
+)
+
+/*
+Cleans up the OCI cache and remains of deleted nodes
+*/
+func Clean() (err error) {
+	warewulfconf := warewulfconf.Get()
+	wwlog.Verbose("removing oci cache dir: %s", path.Join(warewulfconf.Paths.Cachedir+"/warewulf"))
+	err = os.RemoveAll(path.Join(warewulfconf.Paths.Cachedir + "/warewulf"))
+	if err != nil {
+		return err
+	}
+	nodeDB, err := node.New()
+	if err != nil {
+		return err
+	}
+	nodes := nodeDB.ListAllNodes()
+	dirList, err := os.ReadDir(path.Join(warewulfconf.Paths.WWProvisiondir, "overlays/"))
+	if err != nil {
+		return err
+	}
+	for _, item := range dirList {
+		if !item.IsDir() {
+			continue
+		}
+		if !util.InSlice(nodes, item.Name()) {
+			wwlog.Verbose("removing overlays of delete node: %s", item.Name())
+			err = os.RemoveAll(path.Join(warewulfconf.Paths.WWProvisiondir, "overlays/", item.Name()))
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return
+}