Expand supported VM images types

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

src/extractcode/archive.py

@@ -1049,9 +1049,9 @@ def try_to_extract(location, target_dir, extractor):
 QCOWHandler = Handler(
     # note that there are v1, v2 and v3 formats.
     name='QEMU QCOW2 disk image',
-    filetypes=('qemu qcow2 image',),
+    filetypes=('qemu qcow2 image', 'qemu qcow image',),
     mimetypes=('application/octet-stream',),
-    extensions=('.qcow2',),
+    extensions=('.qcow2', '.qcow', '.qcow2c', '.img',),
     kind=file_system,
     extractors=[extract_vm_image],
     strict=True,

src/extractcode/vmimage.py

@@ -137,6 +137,9 @@ def from_file(cls, location):
 
         supported_gfs_formats_by_extension = {
             '.qcow2': 'qcow2',
+            '.qcow2c': 'qcow2',
+            '.qcow': 'qcow2',
+            '.img': 'qcow2',
             '.vmdk': 'vmdk',
             '.vdi': 'vdi',
         }