internal/pkg: remove typeflag promotion loop

Expanding this enables sharing of code common between types.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/tar.go

@@ -11,7 +11,6 @@ import (
 	"io/fs"
 	"net/http"
 	"os"
-	"path"
 
 	"hakurei.app/container/check"
 )
@@ -142,81 +141,66 @@ func (a *tarArtifact) Cure(t *TContext) (err error) {
 	r := tar.NewReader(tr)
 	for header, err = r.Next(); err == nil; header, err = r.Next() {
 		typeflag := header.Typeflag
-		for {
-			switch typeflag {
-			case 0:
-				if len(header.Name) > 0 && header.Name[len(header.Name)-1] == '/' {
-					typeflag = tar.TypeDir
-				} else {
-					typeflag = tar.TypeReg
-				}
-				continue
-
-			case tar.TypeReg:
-				p := temp.Append(header.Name).String()
-				if err = os.MkdirAll(path.Dir(p), 0700); err != nil {
-					return
-				}
-
-				var f *os.File
-				if f, err = os.OpenFile(
-					p,
-					os.O_CREATE|os.O_EXCL|os.O_WRONLY,
-					header.FileInfo().Mode()&0500,
-				); err != nil {
-					return
-				}
-				if _, err = io.Copy(f, r); err != nil {
-					_ = f.Close()
-					return
-				} else if err = f.Close(); err != nil {
-					return
-				}
-				break
-
-			case tar.TypeLink:
-				p := temp.Append(header.Name).String()
-				if err = os.MkdirAll(path.Dir(p), 0700); err != nil {
-					return
-				}
-				if err = os.Link(header.Linkname, p); err != nil {
-					return
-				}
-				break
-
-			case tar.TypeSymlink:
-				p := temp.Append(header.Name).String()
-				if err = os.MkdirAll(path.Dir(p), 0700); err != nil {
-					return
-				}
-				if err = os.Symlink(header.Linkname, p); err != nil {
-					return
-				}
-				break
-
-			case tar.TypeDir:
-				pathname := temp.Append(header.Name)
-				madeDirectories = append(madeDirectories, dirTargetPerm{
-					path: pathname,
-					mode: header.FileInfo().Mode(),
-				})
-				if err = os.MkdirAll(
-					pathname.String(),
-					0700,
-				); err != nil {
-					return
-				}
-				break
-
-			case tar.TypeXGlobalHeader:
-				// ignore
-				break
-
-			default:
-				return DisallowedTypeflagError(typeflag)
+		if typeflag == 0 {
+			if len(header.Name) > 0 && header.Name[len(header.Name)-1] == '/' {
+				typeflag = tar.TypeDir
+			} else {
+				typeflag = tar.TypeReg
 			}
+		}
 
+		pathname := temp.Append(header.Name)
+		if typeflag >= '0' && typeflag <= '9' && typeflag != tar.TypeDir {
+			if err = os.MkdirAll(pathname.Dir().String(), 0700); err != nil {
+				return
+			}
+		}
+
+		switch typeflag {
+		case tar.TypeReg:
+			var f *os.File
+			if f, err = os.OpenFile(
+				pathname.String(),
+				os.O_CREATE|os.O_EXCL|os.O_WRONLY,
+				header.FileInfo().Mode()&0500,
+			); err != nil {
+				return
+			}
+			if _, err = io.Copy(f, r); err != nil {
+				_ = f.Close()
+				return
+			} else if err = f.Close(); err != nil {
+				return
+			}
 			break
+
+		case tar.TypeLink:
+			if err = os.Link(header.Linkname, pathname.String()); err != nil {
+				return
+			}
+			break
+
+		case tar.TypeSymlink:
+			if err = os.Symlink(header.Linkname, pathname.String()); err != nil {
+				return
+			}
+			break
+
+		case tar.TypeDir:
+			madeDirectories = append(madeDirectories, dirTargetPerm{
+				path: pathname,
+				mode: header.FileInfo().Mode(),
+			})
+			if err = os.MkdirAll(pathname.String(), 0700); err != nil {
+				return
+			}
+			break
+
+		case tar.TypeXGlobalHeader:
+			continue // ignore
+
+		default:
+			return DisallowedTypeflagError(typeflag)
 		}
 	}
 	if errors.Is(err, io.EOF) {