Switch from suffix checks to archive checks (#9963)

* fix: switched from suffix checks to archive checks

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Cleanup

seems like both functions accept Path type input so removing str()

* import always

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

utils/general.py

@@ -23,8 +23,9 @@ from itertools import repeat
 from multiprocessing.pool import ThreadPool
 from pathlib import Path
 from subprocess import check_output
+from tarfile import is_tarfile
 from typing import Optional
-from zipfile import ZipFile
+from zipfile import ZipFile, is_zipfile
 
 import cv2
 import IPython
@@ -465,7 +466,7 @@ def check_dataset(data, autodownload=True):
 
     # Download (optional)
     extract_dir = ''
-    if isinstance(data, (str, Path)) and str(data).endswith('.zip'):  # i.e. gs://bucket/dir/coco128.zip
+    if isinstance(data, (str, Path)) and (is_zipfile(data) or is_tarfile(data)):
         download(data, dir=f'{DATASETS_DIR}/{Path(data).stem}', unzip=True, delete=False, curl=False, threads=1)
         data = next((DATASETS_DIR / Path(data).stem).rglob('*.yaml'))
         extract_dir, autodownload = data.parent, False
@@ -607,11 +608,11 @@ def download(url, dir='.', unzip=True, delete=True, curl=False, threads=1, retry
                 else:
                     LOGGER.warning(f'❌ Failed to download {url}...')
 
-        if unzip and success and f.suffix in ('.zip', '.tar', '.gz'):
+        if unzip and success and (f.suffix == '.gz' or is_zipfile(f) or is_tarfile(f)):
             LOGGER.info(f'Unzipping {f}...')
-            if f.suffix == '.zip':
+            if is_zipfile(f):
                 unzip_file(f, dir)  # unzip
-            elif f.suffix == '.tar':
+            elif is_tarfile(f):
                 os.system(f'tar xf {f} --directory {f.parent}')  # unzip
             elif f.suffix == '.gz':
                 os.system(f'tar xfz {f} --directory {f.parent}')  # unzip