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nmbug-status: Clarify errors for illegible configs

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Carl Worth pointed out that errors like:

  $ ./nmbug-status
  fatal: Not a git repository: '/home/cworth/.nmbug'
  fatal: Not a git repository: '/home/cworth/.nmbug'
  Traceback (most recent call last):
    File "./nmbug-status", line 254, in <module>
      config = read_config(path=args.config)
    File "./nmbug-status", line 73, in read_config
      return json.load(fp)
    File "/usr/lib/python2.7/json/__init__.py", line 290, in load
      **kw)
    File "/usr/lib/python2.7/json/__init__.py", line 338, in loads
      return _default_decoder.decode(s)
    File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
      obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    File "/usr/lib/python2.7/json/decoder.py", line 384, in raw_decode
      raise ValueError("No JSON object could be decoded")
  ValueError: No JSON object could be decoded

are not particularly clear.  With this commit, we'll get output like:

  $ ./nmbug-status
  fatal: Not a git repository: '/home/wking/.nmbug'
  No local branch 'config' in /home/wking/.nmbug.  Checkout a local
  config branch or explicitly set --config.

which is much more accessible.  I've also added user-friendly messages
for a number of other config-parsing errors.
This commit is contained in:
W. Trevor King 2014-05-10 12:16:38 -07:00 committed by David Bremner
parent 6d44e5ac47
commit bed8b6743d
1 changed files with 44 additions and 8 deletions
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50
devel/nmbug/nmbug-status
View file

@ -69,28 +69,60 @@ if not hasattr(collections, 'OrderedDict'): # Python 2.6 or earlier
collections.OrderedDict = _OrderedDict
class ConfigError (Exception):
"""Errors with config file usage
"""
pass
def read_config(path=None, encoding=None):
"Read config from json file"
if not encoding:
encoding = _ENCODING
if path:
fp = open(path)
try:
with open(path, 'rb') as f:
config_bytes = f.read()
except IOError as e:
raise ConfigError('Could not read config from {}'.format(path))
else:
nmbhome = os.getenv('NMBGIT', os.path.expanduser('~/.nmbug'))
branch = 'config'
filename = 'status-config.json'
# read only the first line from the pipe
sha1_bytes = subprocess.Popen(
['git', '--git-dir', nmbhome, 'show-ref', '-s', 'config'],
['git', '--git-dir', nmbhome, 'show-ref', '-s', branch],
stdout=subprocess.PIPE).stdout.readline()
sha1 = sha1_bytes.decode(encoding).rstrip()
if not sha1:
raise ConfigError(
("No local branch '{branch}' in {nmbgit}. "
'Checkout a local {branch} branch or explicitly set --config.'
).format(branch=branch, nmbgit=nmbhome))
fp_byte_stream = subprocess.Popen(
p = subprocess.Popen(
['git', '--git-dir', nmbhome, 'cat-file', 'blob',
sha1+':status-config.json'],
stdout=subprocess.PIPE).stdout
fp = codecs.getreader(encoding=encoding)(stream=fp_byte_stream)
'{}:{}'.format(sha1, filename)],
stdout=subprocess.PIPE)
config_bytes, err = p.communicate()
status = p.wait()
if status != 0:
raise ConfigError(
("Missing status-config.json in branch '{branch}' of"
'{nmbgit}. Add the file or explicitly set --config.'
).format(branch=branch, nmbgit=nmbhome))
return json.load(fp)
config_json = config_bytes.decode(encoding)
try:
return json.loads(config_json)
except ValueError as e:
if not path:
path = "{} in branch '{}' of {}".format(
filename, branch, nmbhome)
raise ConfigError(
'Could not parse JSON from the config file {}:\n{}'.format(
path, e))
class Thread (list):
@ -274,7 +306,11 @@ parser.add_argument('--get-query', help='get query for view',
args = parser.parse_args()
try:
config = read_config(path=args.config)
except ConfigError as e:
print(e)
sys.exit(1)
header_template = config['meta'].get('header', '''<!DOCTYPE html>
<html lang="en">