Add zstd to permitted archive compressions

Use the xtarfile module to handle zstd compressed archive.

Note this isn't quite as straightforward as 'import xtarfile as
tarfile', because it isn't precisely a drop-in replacement for tarfile,
because:

(i) the 'mode' argument to xtarfile.open() is mandatory, and
(ii) it doesn't re-export tarfile exception classes such as tarfile.ReadError

1 files changed, 2 insertions, 2 deletions

diff --git a/calm/pkg2html.py b/calm/pkg2html.py
index 32709bb..ffd16b0 100755
--- a/calm/pkg2html.py
+++ b/calm/pkg2html.py
@@ -49,9 +49,9 @@ import os
 import re
 import string
 import sys
-import tarfile
 import textwrap
 import time
+import xtarfile
 
 from .version import SetupVersion
 from . import common_constants
@@ -482,7 +482,7 @@ def write_arch_listing(args, packages, arch):
                             pass
                         else:
                             try:
-                                with tarfile.open(tf) as a:
+                                with xtarfile.open(tf, mode='r') as a:
                                     for i in a:
                                         print('    %-16s%12d %s' % (time.strftime('%Y-%m-%d %H:%M', time.gmtime(i.mtime)), i.size, i.name), file=f, end='')
                                         if i.isdir():