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Refactored Image classes.

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There were very similar methods for downloading/proceeding with
checksum for both Ubuntu and Fedora classes. Extracted those two into
methods in base class.
This commit is contained in:
gryf
2021-09-29 14:46:59 +02:00
parent 1999f1dc7e
commit 74053995c8
1 changed files with 29 additions and 63 deletions
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92
box.py
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@@ -865,21 +865,6 @@ class Image:
return False
return True
def _download_image(self):
raise NotImplementedError()
class Ubuntu(Image):
URL = "https://cloud-images.ubuntu.com/releases/%s/release/%s"
IMG = "ubuntu-%s-server-cloudimg-%s.img"
def __init__(self, vbox, version, arch, release):
super().__init__(vbox, version, arch, release)
self._img_fname = self.IMG % (version, arch)
self._img_url = self.URL % (version, self._img_fname)
self._checksum_file = 'SHA256SUMS'
self._checksum_url = self.URL % (version, self._checksum_file)
def _checksum(self):
"""
Get and check checkusm for downloaded image. Return True if the
@@ -890,15 +875,8 @@ class Ubuntu(Image):
return False
LOG.info('Calculating checksum for "%s"', self._img_fname)
expected_sum = None
fname = os.path.join(self._tmp, self._checksum_file)
Run(['wget', self._checksum_url, '-q', '-O', fname])
with open(fname) as fobj:
for line in fobj.readlines():
if self._img_fname in line:
expected_sum = line.split(' ')[0]
break
expected_sum = self._get_checksum(fname)
if not expected_sum:
LOG.fatal('Cannot find checksum for provided cloud image')
@@ -930,6 +908,32 @@ class Ubuntu(Image):
LOG.header('Downloaded image %s', self._img_fname)
return True
def _get_checksum(self, fname):
raise NotImplementedError()
class Ubuntu(Image):
URL = "https://cloud-images.ubuntu.com/releases/%s/release/%s"
IMG = "ubuntu-%s-server-cloudimg-%s.img"
def __init__(self, vbox, version, arch, release):
super().__init__(vbox, version, arch, release)
self._img_fname = self.IMG % (version, arch)
self._img_url = self.URL % (version, self._img_fname)
self._checksum_file = 'SHA256SUMS'
self._checksum_url = self.URL % (version, self._checksum_file)
def _get_checksum(self, fname):
expected_sum = None
Run(['wget', self._checksum_url, '-q', '-O', fname])
with open(fname) as fobj:
for line in fobj.readlines():
if self._img_fname in line:
expected_sum = line.split(' ')[0]
break
return expected_sum
class Fedora(Image):
URL = ("https://download.fedoraproject.org/pub/fedora/linux/releases/%s/"
@@ -944,18 +948,8 @@ class Fedora(Image):
self._checksum_file = self.CHKS % (version, release, arch)
self._checksum_url = self.URL % (version, arch, self._checksum_file)
def _checksum(self):
"""
Get and check checkusm for downloaded image. Return True if the
checksum is correct, False otherwise.
"""
if not os.path.exists(os.path.join(CACHE_DIR, self._img_fname)):
LOG.debug('Image %s not downloaded yet', self._img_fname)
return False
LOG.info('Calculating checksum for "%s"', self._img_fname)
def _get_checksum(self, fname):
expected_sum = None
fname = os.path.join(self._tmp, self._checksum_file)
Run(['wget', self._checksum_url, '-q', '-O', fname])
with open(fname) as fobj:
@@ -965,35 +959,7 @@ class Fedora(Image):
if self._img_fname in line:
expected_sum = line.split('=')[1].strip()
break
if not expected_sum:
LOG.fatal('Cannot find checksum for provided cloud image')
return False
if os.path.exists(os.path.join(CACHE_DIR, self._img_fname)):
cmd = ['sha256sum', os.path.join(CACHE_DIR, self._img_fname)]
calulated_sum = Run(cmd).stdout.split(' ')[0]
LOG.details('Checksum for image: %s, expected: %s', calulated_sum,
expected_sum)
return calulated_sum == expected_sum
return False
def _download_image(self):
if self._checksum():
LOG.details('Image already downloaded: %s', self._img_fname)
return True
fname = os.path.join(CACHE_DIR, self._img_fname)
Run(['wget', '-q', self._img_url, '-O', fname])
if not self._checksum():
# TODO: make some retry mechanism?
LOG.fatal('Checksum for downloaded image differ from expected')
return False
LOG.header('Downloaded image %s', self._img_fname)
return True
return expected_sum
DISTROS = {'ubuntu': {'username': 'ubuntu',