cmds.posix.Tar: Add command

Add a "jw-pkg posix tar" command. Currently the only thing that can be done with it is extracting.
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/posix/tar/CmdExtract.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from argparse import Namespace, ArgumentParser
+
+from .Cmd import Cmd
+from ..CmdTar import CmdTar
+
+from ....lib.FileContext import FileContext
+
+class CmdExtract(Cmd): # export
+
+    def __init__(self, parent: CmdTar) -> None:
+        super().__init__(parent, 'x', help="Extract a tar archive")
+
+    def add_arguments(self, parser: ArgumentParser) -> None:
+        super().add_arguments(parser)
+        parser.add_argument('dst', help='Destination root URI')
+
+    async def _run(self, args: Namespace) -> None:
+        async with self.ctx(
+                dst_uri = args.dst,
+            ) as ctx:
+            await ctx.extract(ctx.dst.root)