internal/pkg: defer directory permissions

This allows creation of directory structures with awkward permission bits.

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

internal/pkg/archive.go

@@ -142,10 +142,7 @@ func (ar *Reader) Next() (*ArchiveHeader, error) {
 		}
 	}
 
-	if n, err := ar.r.Read(ar.buf[:]); err != nil {
-		if errors.Is(err, io.EOF) && n != 0 {
-			err = io.ErrUnexpectedEOF
-		}
+	if _, err := io.ReadFull(ar.r, ar.buf[:]); err != nil {
 		return nil, err
 	}
 
@@ -157,13 +154,9 @@ func (ar *Reader) Next() (*ArchiveHeader, error) {
 	pPathSize := alignSize(pathSize)
 
 	buf := make([]byte, pPathSize)
-	if n, err := ar.r.Read(buf); err != nil {
+	if _, err := io.ReadFull(ar.r, buf); err != nil {
 		if errors.Is(err, io.EOF) {
-			if n != len(buf) {
-				return nil, io.ErrUnexpectedEOF
-			}
-			h.Path = unsafe.String(unsafe.SliceData(buf), pathSize)
-			return &h, err
+			err = io.ErrUnexpectedEOF
 		}
 		return nil, err
 	}
@@ -330,6 +323,12 @@ func (a archiveArtifact) Cure(t *TContext) (err error) {
 		}
 	}()
 
+	type dirTargetPerm struct {
+		path string
+		mode fs.FileMode
+	}
+	var madeDirectories []dirTargetPerm
+
 	if err = os.MkdirAll(t.GetWorkDir().String(), 0700); err != nil {
 		return
 	}
@@ -379,7 +378,11 @@ func (a archiveArtifact) Cure(t *TContext) (err error) {
 				continue
 			}
 
-			if err = root.Mkdir(header.Path, header.Mode.Perm()); err != nil {
+			madeDirectories = append(madeDirectories, dirTargetPerm{
+				path: header.Path,
+				mode: header.Mode,
+			})
+			if err = root.Mkdir(header.Path, 0700); err != nil {
 				return
 			}
 		} else {
@@ -389,5 +392,14 @@ func (a archiveArtifact) Cure(t *TContext) (err error) {
 	if errors.Is(err, io.EOF) {
 		err = nil
 	}
+	if err == nil {
+		for _, e := range madeDirectories {
+			if err = root.Chmod(e.path, e.mode.Perm()); err != nil {
+				return
+			}
+		}
+	} else {
+		return
+	}
 	return
 }