def _verify(self):
"""Check if the installation is valid.
A valid installation provides all expected libraries and commands.
Subclasses may wish to perform additional checks.
Returns:
True: If the installation at self.install_prefix is valid.
Raises:
SoftwarePackageError: Describs why the installation is invalid.
"""
LOGGER.debug("Checking %s installation at '%s' targeting %s %s",
self.name, self.install_prefix, self.target_arch, self.target_os)
if not os.path.exists(self.install_prefix):
raise SoftwarePackageError("'%s' does not exist" % self.install_prefix)
for cmd in self.commands:
path = os.path.join(self.bin_path, cmd)
if not os.path.exists(path):
raise SoftwarePackageError("'%s' is missing" % path)
if not os.access(path, os.X_OK):
raise SoftwarePackageError("'%s' exists but is not executable" % path)
for lib in self.libraries:
path = os.path.join(self.lib_path, lib)
if not util.file_accessible(path):
raise SoftwarePackageError("'%s' is not accessible" % path)
LOGGER.debug("%s installation at '%s' is valid", self.name, self.install_prefix)
return True
def __call__(self, parser, namespace, flag, unused_option_string=None):
"""Sets the `self.dest` attribute in `namespace` to the parsed value of `flag`.
If `flag` parses to a boolean True value then the attribute value is 'download'.
If `flag` parses to a boolean False value then the attribute value is ``None``.
Otherwise the attribute value is the value of `flag`.
Args:
parser (str): Argument parser object this group belongs to.
namespace (object): Namespace to receive parsed value via setattr.
flag (str): Value parsed from the command line.
"""
try:
flag_as_bool = util.parse_bool(flag, additional_true=['download'])
except TypeError:
if util.is_url(flag):
value = flag
else:
value = os.path.abspath(os.path.expanduser(flag))
if not (os.path.isdir(value) or util.file_accessible(value)):
raise argparse.ArgumentError(self, "Boolean, 'download', valid path, or URL required: %s" % value)
else:
if flag_as_bool == True:
value = 'download'
elif flag_as_bool == False:
value = None
setattr(namespace, self.dest, value)
def connect_database(self, *args, **kwargs):
"""Open the database for reading and writing."""
if self._database is None:
dbfile = os.path.join(self.prefix, self.name + ".json")
try:
self._database = tinydb.TinyDB(dbfile, storage=_JsonFileStorage)
except IOError as err:
raise StorageError(
"Failed to access %s database '%s': %s" % (self.name, dbfile, err),
"Check that you have `write` access",
)
if not util.file_accessible(dbfile):
raise StorageError(
"Database file '%s' exists but cannot be read." % dbfile, "Check that you have `read` access"
)
LOGGER.debug("Initialized %s database '%s'", self.name, dbfile)