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diff --git a/doc/source/tutorials/apt-get.rst b/doc/source/tutorials/apt-get.rst new file mode 100644 index 0000000..26ebc3d --- /dev/null +++ b/doc/source/tutorials/apt-get.rst @@ -0,0 +1,46 @@ +Doing stuff :command:`apt-get` does +=================================== +:Author: Julian Andres Klode <jak@debian.org> +:Release: |release| +:Date: |today| + +The following article will show how you can use python-apt to do actions done +by the :command:`apt-get` command. + + +Printing the URIs of all index files +------------------------------------ +We all now that we can print the URIs of all our index files by running a +simple ``apt-get --print-uris update``. We can do the same. Responsible for +the source entries is the class :class:`apt_pkg.SourceList`, which can be +combined with an :class:`apt_pkg.Acquire` object using :meth:`get_indexes`. + +First of all, we have to create the objects:: + + acquire = apt_pkg.Acquire() + slist = apt_pkg.SourceList() + +Now we have to parse /etc/apt/sources.list and its friends, by using +:meth:`apt_pkg.SourceList.read_main_list`:: + + slist.read_main_list() + +The **slist** object now knows about the location of the indexes. We now have +to load those indexes into the *acquire* object by calling +:meth:`apt_pkg.SourceList.get_indexes`:: + + slist.get_indexes(acquire, True) + +The first argument is the acquire object into which we will load these indexes, +and the second argument means that we want to fetch all indexes. Now the only +thing left to do is iterating over the list of items and printing out their +URIs. Luckily, there is :attr:`apt_pkg.Acquire.items` which allows us to +iterate over the items:: + + for item in acquire.items: + print(item.desc_uri) + +In the end a program could look like this: + +.. literalinclude:: ../examples/update-print-uris.py + |