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Developer notes |
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=============== |
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.. highlight:: shell-example |
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|
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Build dependencies |
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------------------ |
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|
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Most dependencies from :doc:`install-quick`, including ``qemu-img`` |
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(marked there as optional) plus (for Python): |
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|
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- `GNU make <http://www.gnu.org/software/make/>`_ |
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- `GNU tar <http://www.gnu.org/software/tar/>`_ |
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- `Gzip <http://www.gnu.org/software/gzip/>`_ |
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- `pandoc <http://johnmacfarlane.net/pandoc/>`_ |
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- `python-epydoc <http://epydoc.sourceforge.net/>`_ |
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- `python-sphinx <http://sphinx.pocoo.org/>`_ |
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(tested with version 1.1.3) |
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- `graphviz <http://www.graphviz.org/>`_ |
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- the `en_US.UTF-8` locale must be enabled on the system |
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- `pylint <http://www.logilab.org/857>`_ and its associated |
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dependencies |
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- `pep8 <https://github.com/jcrocholl/pep8/>`_ |
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|
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For older developement (Ganeti < 2.4) ``docbook`` was used instead |
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``pandoc``. |
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|
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Note that for pylint, at the current moment the following versions |
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must be used:: |
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|
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$ pylint --version |
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pylint 0.21.1, |
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astng 0.20.1, common 0.50.3 |
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|
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The same with pep8, other versions may give you errors:: |
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$ pep8 --version |
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1.2 |
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|
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To generate unittest coverage reports (``make coverage``), `coverage |
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<http://pypi.python.org/pypi/coverage>`_ needs to be installed. |
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|
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Installation of all dependencies listed here:: |
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|
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$ apt-get install python-setuptools |
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$ apt-get install pandoc python-epydoc graphviz |
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$ cd / && sudo easy_install \ |
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sphinx \ |
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logilab-astng==0.20.1 \ |
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logilab-common==0.50.3 \ |
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pylint==0.21.1 \ |
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pep8==1.2 \ |
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coverage |
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|
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For Haskell development, again all things from the quick install |
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document, plus: |
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- `haddock <http://www.haskell.org/haddock/>`_, documentation |
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generator (equivalent to epydoc for Python) |
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- `HsColour <http://hackage.haskell.org/package/hscolour>`_, again |
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used for documentation (it's source-code pretty-printing) |
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- `hlint <http://community.haskell.org/~ndm/hlint/>`_, a source code |
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linter (equivalent to pylint for Python), recommended version 1.8 or |
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above (tested with 1.8.15) |
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- the `QuickCheck <http://hackage.haskell.org/package/QuickCheck>`_ |
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library, version 2.x |
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- the `HUnit <http://hunit.sourceforge.net/>`_ library (tested with |
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1.2.x) |
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- the `test-framework |
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<http://batterseapower.github.com/test-framework/>`_ libraries, |
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tested versions: ``test-framework``: 0.6, ``test-framework-hunit``: |
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0.2.7, ``test-framework-quickcheck2``: 0.2.12 |
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- ``hpc``, which comes with the compiler, so you should already have |
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it |
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- `shelltestrunner <http://joyful.com/shelltestrunner>`_, used for |
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running shell-based unit-tests |
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- `temporary <https://github.com/batterseapower/temporary/>`_ library, |
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tested with version 1.1.2.3 |
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|
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Under Debian Wheezy or later, these can be installed (on top of the |
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required ones from the quick install document) via:: |
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$ apt-get install libghc-quickcheck2-dev libghc-hunit-dev \ |
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libghc-test-framework-dev \ |
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libghc-test-framework-quickcheck2-dev \ |
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libghc-test-framework-hunit-dev \ |
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libghc-temporary-dev \ |
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hscolour hlint |
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|
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Or alternatively via ``cabal``:: |
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|
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$ cabal install QuickCheck HUnit \ |
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test-framework test-framework-quickcheck2 test-framework-hunit \ |
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temporary hscolour hlint shelltestrunner |
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|
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|
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Configuring for development |
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--------------------------- |
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|
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Run the following command (only use ``PYTHON=...`` if you need to use a |
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different python version):: |
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|
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$ ./autogen.sh && \ |
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./configure --prefix=/usr/local --sysconfdir=/etc --localstatedir=/var |
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|
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Note that doing development on a machine which already has Ganeti |
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installed is problematic, as ``PYTHONPATH`` behaviour can be confusing |
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(see Issue 170 for a bit of history/details; in general it works if |
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the installed and developed versions are very similar, and/or if |
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PYTHONPATH is customised correctly). As such, in general it's |
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recommended to use a "clean" machine for ganeti development. |
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|
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Haskell development notes |
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------------------------- |
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|
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There are a few things which can help writing or debugging the Haskell |
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code. |
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|
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You can run the Haskell linter :command:`hlint` via:: |
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|
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$ make hlint |
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This is not enabled by default (as the htools component is |
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optional). The above command will generate both output on the terminal |
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and, if any warnings are found, also an HTML report at |
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``doc/hs-lint.html``. |
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|
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When writing or debugging TemplateHaskell code, it's useful to see |
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what the splices are converted to. This can be done via:: |
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$ make HEXTRA="-ddump-splices" |
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|
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Or, more interactively:: |
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|
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$ ghci |
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λ> :set -ddump-splices |
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λ> :l src/Ganeti/Objects.hs |
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And you will get the spliced code as the module is loaded. |
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To build profiling code you must install the ``ghc-prof`` (or |
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``gch6-prof``) package, and all the relevant libraries with their |
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``-prof`` counterparts. If installing libraries through cabal the config |
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file should include ``library-profiling: True`` or the ``-p`` flag |
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should be used. Any library already installed can be updated by passing |
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``--reinstall`` as well. |
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Due to the way TemplateHaskell works, it's not straightforward to |
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build profiling code. The recommended way is to run ``make hs-prof``, |
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or alternatively the manual sequence is:: |
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|
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$ make clean |
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$ make src/htools HEXTRA="-osuf .o" |
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$ rm src/htools |
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$ make src/htools HEXTRA="-osuf .prof_o -prof -auto-all" |
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|
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This will build the binary twice, per the TemplateHaskell |
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documentation, the second one with profiling enabled. |
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The binary files generated by compilation and the profiling/coverage |
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files can "break" tab-completion in the sources; they can be ignored, |
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for example, in bash via ``.bashrc``:: |
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FIGNORE='.o:.hi:.prof_o:.tix' |
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or in emacs via ``completion-ignored-extensions`` (run ``M-x |
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customize-var completion-ignored-extensions``). |
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Running individual tests |
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~~~~~~~~~~~~~~~~~~~~~~~~ |
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|
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When developing code, running the entire test suite can be |
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slow. Running individual tests is possible easily for unit-tests, less |
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so for shell-tests (but these are faster, so it shouldn't be needed). |
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|
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For Python tests:: |
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|
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$ export PYTHONPATH=$PWD |
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$ python ./test/py/ganeti.%mytest% |
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|
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For Haskell tests:: |
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|
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$ make htest/test && ./htest/test -t %pattern% |
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|
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Where ``pattern`` can be a simple test pattern (e.g. ``comma``, |
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matching any test whose name contains ``comma``), a test pattern |
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denoting a group (ending with a slash, e.g. ``Utils/``), or more |
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complex glob pattern. For more details, see the documentation (on the |
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`test-framework homepage |
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<http://batterseapower.github.com/test-framework/>`_). |
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|
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Packaging notes |
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=============== |
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|
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Ganeti is mostly developed and tested on `Debian |
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<http://www.debian.org/>`_-based distributions, while still keeping |
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adaptability to other Linux distributions in mind. |
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|
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The ``doc/examples/`` directory contains a number of potentially useful |
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scripts and configuration files. Some of them might need adjustment |
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before use. |
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|
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``daemon-util`` |
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--------------- |
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|
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This script, in the source code as ``daemons/daemon-util.in``, is used |
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to start/stop Ganeti and do a few other things related to system |
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daemons. It is recommended to use ``daemon-util`` also from the system's |
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init scripts. That way the code starting and stopping daemons is shared |
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and future changes have to be made in only one place. |
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|
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``daemon-util`` reads extra arguments from variables (``*_ARGS``) in |
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``/etc/default/ganeti``. When modifying ``daemon-util``, keep in mind to |
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not remove support for the ``EXTRA_*_ARGS`` variables for starting |
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daemons. Some parts of Ganeti use them to pass additional arguments when |
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starting a daemon. |
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|
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The ``reload_ssh_keys`` function can be adjusted to use another command |
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for reloading the OpenSSH daemon's host keys. |
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