Preserve Permissions on .zip extraction (#30407)

#24556 merged in support for Python's .zip file support via ZipFile.
However as per #30200 ZipFile does not preserve file permissions of
the extracted contents. This PR returns to using the `unzip`
executable on non-Windows systems (as was the case before #24556)
and now uses `tar` on Windows to extract .zip files.

lib/spack/spack/util/compression.py

@@ -5,6 +5,7 @@
 
 import os
 import re
+import sys
 from itertools import product
 
 from spack.util.executable import which
@@ -18,6 +19,8 @@
 ALLOWED_ARCHIVE_TYPES = [".".join(ext) for ext in product(
     PRE_EXTS, EXTS)] + PRE_EXTS + EXTS + NOTAR_EXTS
 
+is_windows = sys.platform == 'win32'
+
 
 def allowed_archive(path):
     return any(path.endswith(t) for t in ALLOWED_ARCHIVE_TYPES)
@@ -48,15 +51,14 @@ def _unzip(archive_file):
     Args:
         archive_file (str): absolute path of the file to be decompressed
     """
-    try:
-        from zipfile import ZipFile
-        destination_abspath = os.getcwd()
-        with ZipFile(archive_file, 'r') as zf:
-            zf.extractall(destination_abspath)
-    except ImportError:
-        unzip = which('unzip', required=True)
-        unzip.add_default_arg('-q')
-        return unzip
+    exe = 'unzip'
+    arg = '-q'
+    if is_windows:
+        exe = 'tar'
+        arg = '-xf'
+    unzip = which(exe, required=True)
+    unzip.add_default_arg(arg)
+    unzip(archive_file)
 
 
 def decompressor_for(path, extension=None):