Rename /ios/apk to /ish/apk, add /ish/version

Dockerfile

@@ -1,5 +1,4 @@
 FROM --platform=linux/386 alpine:3.12.0 AS ish-alpine
-RUN touch /etc/ish-version
 
 FROM ish-alpine
 LABEL ish.export=appstore.tar.gz
@@ -8,5 +7,6 @@ RUN : > /etc/motd
 
 FROM ish-alpine
 LABEL ish.export=appstore-apk.tar.gz
+RUN mkdir /ish && touch /ish/version
 COPY apk-motd /etc/motd
 COPY odr-repositories /etc/apk/repositories

flatten.py

@@ -5,31 +5,48 @@
 import tarfile
 
 WHITEOUT = '.wh.'
+WHITEOUT_OPAQUE = '.wh..wh..opq'
 
 def flatten(image, output):
     manifest = json.load(image.extractfile('manifest.json'))
     assert len(manifest) == 1
     manifest = manifest[0]
+
     entries = {}
     layers = [tarfile.open(fileobj=image.extractfile(layer)) for layer in manifest['Layers']]
     for layer in layers:
+        real_members = []
+        # process whiteout files
         for info in layer.getmembers():
             info.name = './' + info.name
             dirname, sep, basename = info.name.rpartition('/')
-            if basename.startswith(WHITEOUT):
+
+            if basename == WHITEOUT_OPAQUE:
+                for key in entries.keys():
+                    if key.startswith(dirname+sep):
+                        del entries[key]
+            elif basename.startswith(WHITEOUT):
                 del entries[dirname+sep+basename[len(WHITEOUT):]]
             else:
-                entries[info.name] = layer, info
+                real_members.append(info)
+                continue
+
+        # real files
+        for info in real_members:
+            entries[info.name] = layer, info
+
     # need a root entry
     if './' not in entries:
         info = tarfile.TarInfo('./')
         info.type = tarfile.DIRTYPE
         info.mode = 0o755
         entries[info.name] = None, info
+
     for layer, info in entries.values():
         fileobj = layer.extractfile(info) if info.isfile() else None
-        info.mtime = 0
+        info.mtime = 0 # make reproducible
         output.addfile(info, fileobj)
+
     for layer in layers:
         layer.close()
 

odr-repositories

@@ -1 +1 @@
-file:///ios/apk/main
+file:///ish/apk/main