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71 lines
2.1 KiB
Python
Executable File
71 lines
2.1 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2014 The Kubernetes Authors All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This is a very simple utility that reads a JSON document from stdin, parses it
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# and returns the specified value. The value is described using a simple dot
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# notation. If any errors are encountered along the way, an error is output and
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# a failure value is returned.
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from __future__ import print_function
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import json
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import sys
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def PrintError(*err):
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print(*err, file=sys.stderr)
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def main():
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try:
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obj = json.load(sys.stdin)
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except Exception, e:
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PrintError("Error loading JSON: {0}".format(str(e)))
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if len(sys.argv) == 1:
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# if we don't have a query string, return success
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return 0
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elif len(sys.argv) > 2:
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PrintError("Usage: {0} <json query>".format(sys.args[0]))
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return 1
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query_list = sys.argv[1].split('.')
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for q in query_list:
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if isinstance(obj, dict):
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if q not in obj:
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PrintError("Couldn't find '{0}' in dict".format(q))
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return 1
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obj = obj[q]
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elif isinstance(obj, list):
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try:
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index = int(q)
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except:
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PrintError("Can't use '{0}' to index into array".format(q))
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return 1
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if index >= len(obj):
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PrintError("Index ({0}) is greater than length of list ({1})".format(q, len(obj)))
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return 1
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obj = obj[index]
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else:
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PrintError("Trying to query non-queryable object: {0}".format(q))
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return 1
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if isinstance(obj, str):
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print(obj)
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else:
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print(json.dumps(obj, indent=2))
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if __name__ == "__main__":
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sys.exit(main())
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