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import contextlib
import os
from six.moves.urllib.error import URLError
from six.moves.urllib.request import urlopen
from leapp.exceptions import StopActorExecutionError
from leapp.libraries.stdlib import CalledProcessError
@contextlib.contextmanager
def guarded_execution(*guards):
try:
yield
except CalledProcessError as e:
# collect output from guards for possible spurious failure
guard_errors = []
for guard in guards:
err = guard()
if err:
guard_errors.append(err)
details = None
if guard_errors:
details = {
'hint': 'Possible spurious failure: {cause}'.format(cause=' '.join(guard_errors))
}
raise StopActorExecutionError(
message=str(e),
details=details
)
def connection_guard(url='https://example.com'):
def closure():
try:
urlopen(url)
return None
except URLError as e:
cause = '''Failed to open url '{url}' with error: {error}'''.format(url=url, error=e)
return ('There was probably a problem with internet connection ({cause}).'
' Check your connection and try again.'.format(cause=cause))
return closure
def space_guard(path='/', min_free_mb=100):
def closure():
info = os.statvfs(path)
free_mb = (info.f_bavail * info.f_frsize) >> 20
if free_mb >= min_free_mb:
return None
return ('''Not enough free disk space in '{path}', needed: {min} M, available: {avail} M.'''
' Free more disk space and try again.'.format(path=path, min=min_free_mb, avail=free_mb))
return closure