def update_configuration(lineagename, archive_dir, target, cli_config):
"""Modifies lineagename's config to contain the specified values.
:param str lineagename: Name of the lineage being modified
:param str archive_dir: Absolute path to the archive directory
:param dict target: Maps ALL_FOUR to their symlink paths
:param .NamespaceConfig cli_config: parsed command line
arguments
:returns: Configuration object for the updated config file
:rtype: configobj.ConfigObj
"""
config_filename = renewal_filename_for_lineagename(cli_config, lineagename)
temp_filename = config_filename + ".new"
# If an existing tempfile exists, delete it
if os.path.exists(temp_filename):
os.unlink(temp_filename)
# Save only the config items that are relevant to renewal
values = relevant_values(vars(cli_config.namespace))
write_renewal_config(config_filename, temp_filename, archive_dir, target,
values)
compat.os_rename(temp_filename, config_filename)
return configobj.ConfigObj(config_filename)
def test_os_rename_to_existing_file(self):
"""Ensure that os_rename will effectively rename src into dst for all platforms."""
src = os.path.join(self.tempdir, 'src')
dst = os.path.join(self.tempdir, 'dst')
open(src, 'w').close()
open(dst, 'w').close()
# On Windows, a direct call to os.rename will fail because dst already exists.
compat.os_rename(src, dst)
self.assertFalse(os.path.exists(src))
self.assertTrue(os.path.exists(dst))
def test_os_rename_to_existing_file(self):
"""Ensure that os_rename will effectively rename src into dst for all platforms."""
src = os.path.join(self.tempdir, 'src')
dst = os.path.join(self.tempdir, 'dst')
open(src, 'w').close()
open(dst, 'w').close()
# On Windows, a direct call to os.rename will fail because dst already exists.
compat.os_rename(src, dst)
self.assertFalse(os.path.exists(src))
self.assertTrue(os.path.exists(dst))
def _timestamp_progress_dir(self):
"""Timestamp the checkpoint."""
# It is possible save checkpoints faster than 1 per second resulting in
# collisions in the naming convention.
for _ in six.moves.range(2):
timestamp = self._checkpoint_timestamp()
final_dir = os.path.join(self.config.backup_dir, timestamp)
try:
compat.os_rename(self.config.in_progress_dir, final_dir)
return
except OSError:
logger.warning("Extreme, unexpected race condition, retrying (%s)", timestamp)
# After 10 attempts... something is probably wrong here...
logger.error(
"Unable to finalize checkpoint, %s -> %s",
self.config.in_progress_dir, final_dir)
raise errors.ReverterError(
"Unable to finalize checkpoint renaming")
