On 30/8/24 15:38, Thomas Huth wrote:
From: Daniel P. Berrangé <berra...@redhat.com>
The 'Asset' class is a simple module that declares a downloadable
asset that can be cached locally. Downloads are stored in the user's
home dir at ~/.cache/qemu/download, using a sha256 sum of the URL.
Signed-off-by: Daniel P. Berrangé <berra...@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <phi...@linaro.org>
Tested-by: Philippe Mathieu-Daudé <phi...@linaro.org>
[thuth: Drop sha1 support, use hash on file content for naming instead of URL,
add the possibility to specify the cache dir via environment variable]
Signed-off-by: Thomas Huth <th...@redhat.com>
---
tests/functional/qemu_test/__init__.py | 1 +
tests/functional/qemu_test/asset.py | 97 ++++++++++++++++++++++++++
2 files changed, 98 insertions(+)
create mode 100644 tests/functional/qemu_test/asset.py
diff --git a/tests/functional/qemu_test/__init__.py
b/tests/functional/qemu_test/__init__.py
index 2f1e0bc70d..db05c8f412 100644
--- a/tests/functional/qemu_test/__init__.py
+++ b/tests/functional/qemu_test/__init__.py
@@ -6,6 +6,7 @@
# later. See the COPYING file in the top-level directory.
+from .asset import Asset
from .config import BUILD_DIR
from .cmd import has_cmd, has_cmds, run_cmd, is_readable_executable_file, \
interrupt_interactive_console_until_pattern, wait_for_console_pattern, \
diff --git a/tests/functional/qemu_test/asset.py
b/tests/functional/qemu_test/asset.py
new file mode 100644
index 0000000000..c0e675d847
--- /dev/null
+++ b/tests/functional/qemu_test/asset.py
@@ -0,0 +1,97 @@
+# Test utilities for fetching & caching assets
+#
+# Copyright 2024 Red Hat, Inc.
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later. See the COPYING file in the top-level directory.
+
+import hashlib
+import logging
+import os
+import subprocess
+import urllib.request
+from pathlib import Path
+from shutil import copyfileobj
+
+
+# Instances of this class must be declared as class level variables
+# starting with a name "ASSET_". This enables the pre-caching logic
+# to easily find all referenced assets and download them prior to
+# execution of the tests.
+class Asset:
+
+ def __init__(self, url, hashsum):
+ self.url = url
+ self.hash = hashsum
+ cache_dir_env = os.getenv('QEMU_TEST_CACHE_DIR')
+ if cache_dir_env:
+ self.cache_dir = Path(cache_dir_env, "download")
+ else:
+ self.cache_dir = Path(Path("~").expanduser(),
+ ".cache", "qemu", "download")
Maybe we should use hashsum[:2] as intermediate bucket directory.
(Suggestion now to not have to move the files again later)
+ self.cache_file = Path(self.cache_dir, hashsum)
+ self.log = logging.getLogger('qemu-test')
+
+ def __repr__(self):
+ return "Asset: url=%s hash=%s cache=%s" % (
+ self.url, self.hash, self.cache_file)
+
+ def _check(self, cache_file):
+ if self.hash is None:
+ return True
+ if len(self.hash) == 64:
+ sum_prog = 'sha256sum'
+ elif len(self.hash) == 128:
+ sum_prog = 'sha512sum'
+ else:
+ raise Exception("unknown hash type")
+
+ checksum = subprocess.check_output(
+ [sum_prog, str(cache_file)]).split()[0]
+ return self.hash == checksum.decode("utf-8")
+
+ def valid(self):
+ return self.cache_file.exists() and self._check(self.cache_file)
+
+ def fetch(self):
+ if not self.cache_dir.exists():
+ self.cache_dir.mkdir(parents=True, exist_ok=True)
+
+ if self.valid():
+ self.log.debug("Using cached asset %s for %s",
+ self.cache_file, self.url)
+ return str(self.cache_file)
+
+ self.log.info("Downloading %s to %s...", self.url, self.cache_file)
+ tmp_cache_file = self.cache_file.with_suffix(".download")
+
+ try:
+ resp = urllib.request.urlopen(self.url)
+ except Exception as e:
+ self.log.error("Unable to download %s: %s", self.url, e)
+ raise
+
+ try:
+ with tmp_cache_file.open("wb+") as dst:
+ copyfileobj(resp, dst)
+ except:
+ tmp_cache_file.unlink()
+ raise
+ try:
+ # Set these just for informational purposes
+ os.setxattr(str(tmp_cache_file), "user.qemu-asset-url",
+ self.url.encode('utf8'))
+ os.setxattr(str(tmp_cache_file), "user.qemu-asset-hash",
+ self.hash.encode('utf8'))
+ except Exception as e:
+ self.log.debug("Unable to set xattr on %s: %s", tmp_cache_file, e)
+ pass
+
+ if not self._check(tmp_cache_file):
+ tmp_cache_file.unlink()
+ raise Exception("Hash of %s does not match %s" %
+ (self.url, self.hash))
+ tmp_cache_file.replace(self.cache_file)
+
+ self.log.info("Cached %s at %s" % (self.url, self.cache_file))
+ return str(self.cache_file)
