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dockerfile.py
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dockerfile.py
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import ast
import glob
import os
__author__ = 'cosmin'
class DockerfileParser(object):
KEYWORDS = "FROM MAINTAINER RUN CMD COPY EXPOSE ENV ADD ENTRYPOINT VOLUME USER WORKDIR ONBUILD".split(" ")
COMMENT_START = "#"
COMMENT_KEYWORDS = "LINK ENV".split(" ")
LINE_CONTINUATION = "\\"
CONFIGURABLE_KEYWORDS = "CMD ENTRYPOINT EXPOSE VOLUME LINK ENV".split(" ")
def __init__(self, dockerfile, configurable_keywords=None):
if not os.path.isfile(dockerfile):
self.dockerfile = dockerfile.split('\n')
else:
with open(dockerfile) as f:
self.dockerfile = f.readlines()
self._cleanup()
self.config = {}
if configurable_keywords is not None:
self.CONFIGURABLE_KEYWORDS = configurable_keywords
def get_config(self):
if not self.config:
self.config = self._parse()
return self.config
def all(self):
return self.get_config()
def get(self, keyword):
config = self.get_config()
return config[keyword] if keyword in config else None
def configurable(self):
config = self.get_config()
return {keyword: config[keyword] for keyword in config if keyword in self.CONFIGURABLE_KEYWORDS}
def _cleanup(self):
newlist = []
joined_lines = ''
for l in self.dockerfile:
l = l.strip()
if l == '':
continue
if l[0] == self.COMMENT_START:
comment = l[1:].split(' ')
if comment[0] not in self.COMMENT_KEYWORDS:
continue
l = l[1:]
if l[-1] == self.LINE_CONTINUATION:
joined_lines += l[:-1]
continue
elif joined_lines:
l = joined_lines + l
joined_lines = ''
newlist.append(l)
self.dockerfile = newlist
def _parse(self):
if len(self.dockerfile) == 1 and self.dockerfile[0][0:4] != 'FROM':
raise Exception('Invalid Dockerfile: %s' % self.dockerfile)
config = {}
for line in self.dockerfile:
kw, arg = line.split(' ', 1)
if kw not in self.KEYWORDS and kw not in self.COMMENT_KEYWORDS:
continue
arg = arg.strip()
if arg[0] == '[' and arg[-1] == ']':
arg = ast.literal_eval(arg)
if kw in config:
config[kw].append(arg)
else:
if isinstance(arg, list):
config[kw] = arg
else:
config[kw] = [arg]
return config
def finder(path):
if not os.path.isdir(path):
return []
os.chdir(path)
return [dockerfile for dockerfile in glob.glob("*/Dockerfile")]