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9903217a4e
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.
[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: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240830133841.142644-15-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
97 lines
3.2 KiB
Python
97 lines
3.2 KiB
Python
# Test utilities for fetching & caching assets
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#
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# Copyright 2024 Red Hat, Inc.
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#
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# This work is licensed under the terms of the GNU GPL, version 2 or
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# later. See the COPYING file in the top-level directory.
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import hashlib
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import logging
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import os
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import subprocess
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import urllib.request
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from pathlib import Path
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from shutil import copyfileobj
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# Instances of this class must be declared as class level variables
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# starting with a name "ASSET_". This enables the pre-caching logic
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# to easily find all referenced assets and download them prior to
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# execution of the tests.
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class Asset:
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def __init__(self, url, hashsum):
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self.url = url
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self.hash = hashsum
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cache_dir_env = os.getenv('QEMU_TEST_CACHE_DIR')
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if cache_dir_env:
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self.cache_dir = Path(cache_dir_env, "download")
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else:
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self.cache_dir = Path(Path("~").expanduser(),
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".cache", "qemu", "download")
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self.cache_file = Path(self.cache_dir, hashsum)
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self.log = logging.getLogger('qemu-test')
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def __repr__(self):
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return "Asset: url=%s hash=%s cache=%s" % (
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self.url, self.hash, self.cache_file)
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def _check(self, cache_file):
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if self.hash is None:
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return True
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if len(self.hash) == 64:
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sum_prog = 'sha256sum'
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elif len(self.hash) == 128:
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sum_prog = 'sha512sum'
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else:
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raise Exception("unknown hash type")
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checksum = subprocess.check_output(
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[sum_prog, str(cache_file)]).split()[0]
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return self.hash == checksum.decode("utf-8")
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def valid(self):
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return self.cache_file.exists() and self._check(self.cache_file)
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def fetch(self):
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if not self.cache_dir.exists():
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self.cache_dir.mkdir(parents=True, exist_ok=True)
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if self.valid():
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self.log.debug("Using cached asset %s for %s",
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self.cache_file, self.url)
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return str(self.cache_file)
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self.log.info("Downloading %s to %s...", self.url, self.cache_file)
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tmp_cache_file = self.cache_file.with_suffix(".download")
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try:
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resp = urllib.request.urlopen(self.url)
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except Exception as e:
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self.log.error("Unable to download %s: %s", self.url, e)
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raise
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try:
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with tmp_cache_file.open("wb+") as dst:
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copyfileobj(resp, dst)
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except:
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tmp_cache_file.unlink()
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raise
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try:
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# Set these just for informational purposes
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os.setxattr(str(tmp_cache_file), "user.qemu-asset-url",
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self.url.encode('utf8'))
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os.setxattr(str(tmp_cache_file), "user.qemu-asset-hash",
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self.hash.encode('utf8'))
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except Exception as e:
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self.log.debug("Unable to set xattr on %s: %s", tmp_cache_file, e)
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pass
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if not self._check(tmp_cache_file):
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tmp_cache_file.unlink()
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raise Exception("Hash of %s does not match %s" %
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(self.url, self.hash))
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tmp_cache_file.replace(self.cache_file)
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self.log.info("Cached %s at %s" % (self.url, self.cache_file))
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return str(self.cache_file)
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