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4
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1 """
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2 package model for python PAckage INTrospection
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3 """
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4
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7
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5 import os
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6 import tarfile
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5
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7 import tempfile
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7
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8 import urllib2
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9 import utils
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5
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10
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4
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11 class Package(object):
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7
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12 # XXX much of this is generic resource stuff and should be split off
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4
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13
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14 def __init__(self, src):
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15 self.src = src
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5
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16 self._tmppath = None
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17
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18 def path(self):
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19 """filesystem path to package"""
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7
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20
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21 # return cached copy if it exists
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22 if self._tmppath:
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23 return self._tmppath
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24
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25 # fetch from the web if a URL
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26 tmpfile = None
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27 src = self.src
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5
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28 if utils.isURL(self.src):
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8
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29 tmpfile = src = self.fetch()
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30
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31 # unpack if an archive
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32 if self.is_archive(src):
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8
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33 try:
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34 self.unpack(src)
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35 finally:
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36 if tmpfile:
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37 os.remove(tmpfile)
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7
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38 return self._tmppath
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39
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5
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40 return self.src
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41
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42 def fetch(self):
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8
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43 """fetch from remote source to a temporary file"""
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7
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44 fd, filename = tmpfile.mkstemp()
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45 resource = urllib.urlopen(self.src)
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46 os.write(fd, resource.read())
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47 os.close(fd)
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48 return filename
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49
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50 def unpack(self, archive):
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51 """unpack the archive to a temporary destination"""
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52 # TODO: should handle zipfile additionally at least
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53 # Ideally, this would be pluggable, etc
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8
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54 assert tarfile.is_tarfile(archive), "%s is not an archive" % self.src
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55 tarfile.TarFile.open(archive)
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7
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56
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57 def is_archive(self, path):
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58 """returns if the filesystem path is an archive"""
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59 # TODO: should handle zipfile additionally at least
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60 # Ideally, this would be pluggable, etc
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61 return tarfile.is_tarfile(path)
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