56 lines
1.6 KiB
Python
56 lines
1.6 KiB
Python
import tarfile
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from cStringIO import StringIO
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from util.registry.tarlayerformat import TarLayerFormat
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from util.registry.gzipwrap import GzipWrap
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class TarfileAppender(TarLayerFormat):
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""" Helper class which allows for appending entries to a gzipped-tarfile and doing so
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in a streaming manner.
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"""
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def __init__(self, base_tar_file, entries):
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super(TarfileAppender, self).__init__(self._get_tar_iterator)
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self.entries = entries
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self.base_tar_file = base_tar_file
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self.first_info = None
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def get_stream(self):
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return GzipWrap(self.get_generator())
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def after_tar_layer(self, current_layer):
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pass
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def check_tar_info(self, tar_info):
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if not self.first_info:
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self.first_info = tar_info
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return True
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def _get_tar_iterator(self):
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# Yield the contents of the base tar.
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yield self.base_tar_file
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# Construct an in-memory tar containing the entries to append, and then yield
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# its data.
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def add_entry(arch, dir_path, contents=None):
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info = tarfile.TarInfo(dir_path)
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info.uid = self.first_info.uid
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info.gid = self.first_info.gid
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info.mode = self.first_info.mode
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info.mtime = self.first_info.mtime
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info.type = tarfile.REGTYPE if contents else tarfile.DIRTYPE
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if contents:
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info.size = len(contents)
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arch.addfile(info, fileobj=StringIO(contents) if contents else None)
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append_tarball = StringIO()
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with tarfile.open(fileobj=append_tarball, mode='w') as updated_archive:
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for entry in self.entries:
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add_entry(updated_archive, entry, self.entries[entry])
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# To make tarfile happy.
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append_tarball.seek(0)
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yield append_tarball
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