Update INSTALL and devnotes documents

Added the new Haskell library requirements, for both normal and
developer usage.

Furthermore, all commands are now converted to the shell-example
lexer.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

INSTALL

@@ -9,6 +9,8 @@ the :doc:`install`. A glossary of terms can be found in the
 Software Requirements
 ---------------------
 
+.. highlight:: shell-example
+
 Before installing, please verify that you have the following programs:
 
 - `Xen Hypervisor <http://www.xen.org/>`_, version 3.0 or above, if
@@ -16,11 +18,11 @@ Before installing, please verify that you have the following programs:
 - `KVM Hypervisor <http://www.linux-kvm.org>`_, version 72 or above, if
   running on KVM. In order to use advanced features, such as live
   migration, virtio, etc, an even newer version is recommended (qemu-kvm
-  versions 0.11.X or above have shown good behavior).
+  versions 0.11.X and above have shown good behavior).
 - `DRBD <http://www.drbd.org/>`_, kernel module and userspace utils,
-  version 8.0.7 or above
-- `RBD <http://ceph.newdream.net/>`_, kernel modules (rbd.ko/libceph.ko)
-  and userspace utils (ceph-common)
+  version 8.0.7 or above; note that Ganeti doesn't yet support version 8.4
+- `RBD <http://ceph.newdream.net/>`_, kernel modules
+  (``rbd.ko``/``libceph.ko``) and userspace utils (``ceph-common``)
 - `LVM2 <http://sourceware.org/lvm2/>`_
 - `OpenSSH <http://www.openssh.com/portable.html>`_
 - `bridge utilities <http://www.linuxfoundation.org/en/Net:Bridge>`_
@@ -44,8 +46,8 @@ Before installing, please verify that you have the following programs:
 - `affinity Python module <http://pypi.python.org/pypi/affinity/0.1.0>`_,
   optional python package for supporting CPU pinning under KVM
 - `ElementTree Python module <http://effbot.org/zone/element-index.htm>`_,
-  if running python 2.4 (optional, used by ovfconverter tool)
-- `qemu-img <http://qemu.org/>`_, if you want to use ovfconverter
+  if running python 2.4 (optional, used by the ``ovfconverter`` tool)
+- `qemu-img <http://qemu.org/>`_, if you want to use ``ovfconverter``
 - `fping <http://fping.sourceforge.net/>`_
 
 These programs are supplied as part of most Linux distributions, so
@@ -60,10 +62,40 @@ packages, except for RBD, DRBD and Xen::
                     python-pyinotify python-pycurl socat \
                     python-elementtree qemu
 
-If you want to also enable the `htools` components, which is recommended
-on bigger deployments (they give you automatic instance placement,
-cluster balancing, etc.), then you need to have a Haskell compiler
-installed. More specifically:
+If you want to build from source, please see doc/devnotes.rst for more
+dependencies.
+
+.. _socat-note:
+.. note::
+  Ganeti's import/export functionality uses ``socat`` with OpenSSL for
+  transferring data between nodes. By default, OpenSSL 0.9.8 and above
+  employ transparent compression of all data using zlib if supported by
+  both sides of a connection. In cases where a lot of data is
+  transferred, this can lead to an increased CPU usage. Additionally,
+  Ganeti already compresses all data using ``gzip`` where it makes sense
+  (for inter-cluster instance moves).
+
+  To remedey this situation, patches implementing a new ``socat`` option
+  for disabling OpenSSL compression have been contributed and will
+  likely be included in the next feature release. Until then, users or
+  distributions need to apply the patches on their own.
+
+  Ganeti will use the option if it's detected by the ``configure``
+  script; auto-detection can be disabled by explicitely passing
+  ``--enable-socat-compress`` (use the option to disable compression) or
+  ``--disable-socat-compress`` (don't use the option).
+
+  The patches and more information can be found on
+  http://www.dest-unreach.org/socat/contrib/socat-opensslcompress.html.
+
+Haskell requirements
+~~~~~~~~~~~~~~~~~~~~
+
+If you want to enable the `htools` component, which is recommended on
+bigger deployments (this give you automatic instance placement, cluster
+balancing, etc.), then you need to have a Haskell compiler installed on
+your build machine (but this is not required on the machines which are
+just going to run Ganeti). More specifically:
 
 - `GHC <http://www.haskell.org/ghc/>`_ version 6.12 or higher
 - or even better, `The Haskell Platform
@@ -89,46 +121,49 @@ were renamed::
   $ apt-get install ghc libghc-json-dev libghc-network-dev \
                     libghc-parallel-dev libghc-curl-dev
 
+If using a distribution which does not provide them, the first install
+the Haskell platform and then install the additional libraries via
+``cabal``::
+
+  $ cabal install json network parallel curl
+
 The compilation of the htools components is automatically enabled when
 the compiler and the requisite libraries are found. You can use the
 ``--enable-htools`` configure flag to force the selection (at which
 point ``./configure`` will fail if it doesn't find the prerequisites).
 
-If you want to build from source, please see doc/devnotes.rst for more
-dependencies.
+In Ganeti version 2.6, one of the daemons (``ganeti-confd``) is shipped
+in two versions: the Python default version (which has no extra
+dependencies), and an experimental Haskell version. This latter version
+can be enabled via the ``./configure`` flag ``--enable-confd=haskell``
+and a few has extra dependencies:
 
-.. _socat-note:
-.. note::
-  Ganeti's import/export functionality uses ``socat`` with OpenSSL for
-  transferring data between nodes. By default, OpenSSL 0.9.8 and above
-  employ transparent compression of all data using zlib if supported by
-  both sides of a connection. In cases where a lot of data is
-  transferred, this can lead to an increased CPU usage. Additionally,
-  Ganeti already compresses all data using ``gzip`` where it makes sense
-  (for inter-cluster instance moves).
+- `hslogger <http://software.complete.org/hslogger>`_, version 1.1 and
+  above (note that Debian Squeeze only has version 1.0.9)
+- `Crypto <http://hackage.haskell.org/package/Crypto>`_, tested with
+  version 4.2.4
+- `text <http://hackage.haskell.org/package/text>`_
+- ``bytestring``, which usually comes with the compiler
 
-  To remedey this situation, patches implementing a new ``socat`` option
-  for disabling OpenSSL compression have been contributed and will
-  likely be included in the next feature release. Until then, users or
-  distributions need to apply the patches on their own.
+These libraries are available in Debian Wheezy (but not in Squeeze), so
+you can use either apt::
 
-  Ganeti will use the option if it's detected by the ``configure``
-  script; auto-detection can be disabled by explicitely passing
-  ``--enable-socat-compress`` (use the option to disable compression) or
-  ``--disable-socat-compress`` (don't use the option).
+  $ apt-get install libghc-hslogger-dev libghc-crypto-dev libghc-text-dev
 
-  The patches and more information can be found on
-  http://www.dest-unreach.org/socat/contrib/socat-opensslcompress.html.
+or ``cabal``::
+
+  $ cabal install hslogger Crypto text
 
+to install them.
 
 Installation of the software
 ----------------------------
 
 To install, simply run the following command::
 
-  ./configure --localstatedir=/var --sysconfdir=/etc && \
-  make && \
-  make install
+  $ ./configure --localstatedir=/var --sysconfdir=/etc && \
+    make && \
+    make install
 
 This will install the software under ``/usr/local``. You then need to
 copy ``doc/examples/ganeti.initd`` to ``/etc/init.d/ganeti`` and

doc/devnotes.rst

 Developer notes
 ===============
 
+.. highlight:: shell-example
+
 Build dependencies
 ------------------
 
@@ -19,7 +21,7 @@ Most dependencies from :doc:`install-quick`, plus (for Python):
 - `pep8 <https://github.com/jcrocholl/pep8/>`_
 
 Note that for pylint, at the current moment the following versions
-need to be used::
+must be used::
 
     $ pylint --version
     pylint 0.21.1,
@@ -42,23 +44,27 @@ document, plus:
   library, version 2.x
 - ``hpc``, which comes with the compiler, so you should already have
   it
+- `shelltestrunner <http://joyful.com/shelltestrunner>`_, used for
+  running unit-tests
+
+Under Debian Wheezy or later, these can be installed (on top of the
+required ones from the quick install document) via::
 
-Under Debian, these can be installed (on top of the required ones from
-the quick install document) via::
+  $ apt-get install libghc-quickcheck2-dev hscolour hlint
 
-  apt-get install libghc-quickcheck2-dev hscolour hlint
+Or alternatively via ``cabal``::
+
+  $ cabal install quickcheck hscolour hlint shelltestrunner
 
 
 Configuring for development
 ---------------------------
 
-.. highlight:: sh
-
 Run the following command (only use ``PYTHON=...`` if you need to use a
 different python version)::
 
-  ./autogen.sh && \
-  ./configure --prefix=/usr/local --sysconfdir=/etc --localstatedir=/var
+  $ ./autogen.sh && \
+    ./configure --prefix=/usr/local --sysconfdir=/etc --localstatedir=/var
 
 Haskell development notes
 -------------------------
@@ -68,7 +74,7 @@ code.
 
 You can run the Haskell linter :command:`hlint` via::
 
-  make hlint
+  $ make hlint
 
 This is not enabled by default (as the htools component is
 optional). The above command will generate both output on the terminal
@@ -78,16 +84,16 @@ and, if any warnings are found, also an HTML report at
 When writing or debugging TemplateHaskell code, it's useful to see
 what the splices are converted to. This can be done via::
 
-  make HEXTRA="-ddump-splices"
+  $ make HEXTRA="-ddump-splices"
 
 Due to the way TemplateHaskell works, it's not straightforward to
 build profiling code. The recommended way is to run ``make hs-prof``,
 or alternatively the manual sequence is::
 
-  make clean
-  make htools/htools HEXTRA="-osuf .o"
-  rm htools/htools
-  make htools/htools HEXTRA="-osuf .prof_o -prof -auto-all"
+  $ make clean
+  $ make htools/htools HEXTRA="-osuf .o"
+  $ rm htools/htools
+  $ make htools/htools HEXTRA="-osuf .prof_o -prof -auto-all"
 
 This will build the binary twice, per the TemplateHaskell
 documentation, the second one with profiling enabled.