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:mod:`apt_inst` - Working with local Debian packages
====================================================
.. module:: apt_inst
The :mod:`apt_inst` extension provides access to functions for working with
locally available Debian packages (.deb files) and tar files.
Checking packages
------------------
.. function:: arCheckMember(file, membername)
Check if the member specified by the parameter ``membername`` exists in
the AR file referenced by the :class:`file` object ``file``.
Listing contents
-----------------
.. function:: debExtract(file, func, chunk)
Call the function referenced by ``func`` for each member of the tar file
``chunk`` which is contained in the AR file referenced by the file object
``file``.
An example would be:
.. code-block:: python
debExtract(open("package.deb"), my_callback, "data.tar.gz")
See :ref:`emulating-dpkg-contents` for a more detailed example.
.. function:: tarExtract(file,func,comp)
Call the function ``func`` for each member of the tar file ``file``.
``Comp`` is a string determining the compressor used. Possible options are
"lzma", "bzip2" and "gzip".
Callback
^^^^^^^^^
Both of these functions expect a callback with the signature
``(what, name, link, mode, uid, gid, size, mtime, major, minor)``.
The parameter ``what`` describes the type of the member. It can be ``FILE``,
``DIR``, or ``HARDLINK``.
The parameter ``name`` refers to the name of the member. In case of links,
``link`` refers to the target of the link.
Extracting contents
-------------------
.. function:: debExtractArchive(file, rootdir)
Extract the archive referenced by the :class:`file` object ``file``
into the directory specified by ``rootdir``.
See :ref:`emulating-dpkg-extract` for an example.
.. warning::
If the directory given by ``rootdir`` does not exist, the package is
extracted into the current directory.
.. function:: debExtractControl(file[, member='control'])
Return the indicated file from the control tar. The default is 'control'.
If you want to print the control file of a given package, you could do
something like:
.. code-block:: python
print debExtractControl(open("package.deb"))
:return: The contents of the file, as :class:`str`.
.. _emulating-dpkg-extract:
Example: Emulating :program:`dpkg` :option:`--extract`
-------------------------------------------------------
Here is a code snippet which emulates dpkg -x. It can be run as
``tool pkg.deb outdir``.
.. literalinclude:: examples/dpkg-extract.py
.. _emulating-dpkg-contents:
Example: Emulating :program:`dpkg` :option:`--contents`
-------------------------------------------------------
.. literalinclude:: examples/dpkg-contents.py
Example: Emulating :program:`dpkg` :option:`--info`
----------------------------------------------------
.. literalinclude:: examples/dpkg-info.py
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