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## $Id$
## This file is part of CDS Invenio.
## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 CERN.
##
## CDS Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## CDS Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with CDS Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
<!-- WebDoc-Page-Title: Directory Organization -->
<!-- WebDoc-Page-Navtrail: <a class="navtrail" href="<CFG_SITE_URL>/help/hacking">Hacking CDS Invenio</a> -->
<!-- WebDoc-Page-Revision: $Id$ -->
<pre>
Please find some notes below on how the source (as well as the target)
directory structure is organized, where the sources get installed to,
and how the visible URLs are organized.
1. CDS Invenio will generally install into the directory taken from
--with-prefix configuration variables. These are discussed in points
2 and 3 below, respectively.
2. The first directory (--with-prefix) specifies general CDS Invenio
install directory, where we'll put CLI binaries, Python and PHP
libraries, manpages, log and cache directories for the running
installation, and any other dirs as needed. They will all live
under one common hood.
For example, configure --with-prefix=/opt/cds-invenio,
and you'll obtain the following principal directories:
/opt/cds-invenio/
/opt/cds-invenio/bin
/opt/cds-invenio/lib
/opt/cds-invenio/lib/php
/opt/cds-invenio/lib/python
/opt/cds-invenio/lib/wml
/opt/cds-invenio/var
/opt/cds-invenio/var/cache
/opt/cds-invenio/var/log
with the obvious meaning:
- bin : for command-line executable binaries and scripts
- lib/php : for our own PHP libraries, see below
- lib/python : for our own Python libraries, see below
- lib/wml : for our own WML libraries, see below
- var : for installation-specific runtime stuff
- var/log : for all sorts of runtime logging, e.g. search.log
- var/cache : for all sorts of runtime caching, e.g. OAI
retention harvesting, collection cache, etc
This scheme copies to some extent the usual Unix filesystem
convention, so it may be easily expanded later according to our
future needs.
3. The second directory (prefix/var/www) contains Web scripts (PHP,
mod_python), HTML documents and images, and so on. This is where
webuser-seen files are located. Basically, the files there contain
only the interface to the functionality that is provided by the
libraries stored under the library directory.
The prefix/var/www directory is further structured according to
whom it provides services. We distinguish user-level, admin-level
and hacker-level access to the site, as reflected by the visible
URL structure.
a) The user-level access point is provided by the main CFG_SITE_URL
address and its subdirs. All the user-level documentation is
available under CFG_SITE_URL/help/. The module-specific user-level
documentation is available under CFG_SITE_URL/help/&lt;module&gt;/.
b) The admin-level access is provided by CFG_SITE_URL/admin/ entry
point. The admin-level documentation is accessible from the
same place. The admin-level module-specific functionality and
help is available under CFG_SITE_URL/admin/&lt;module&gt;/. (If
it's written in mod_python, it usually points to
CFG_SITE_URL/&lt;module&gt;admin.py/ since we configure the server
to have all mod_python scripts under the prefix/var/www root
directory.)
c) The hacker-level documentation is provided by CFG_SITE_URL/hacking/
entry point. There is no hacker-level functionality possible
via Web, of course, so that unlike admin-level entry point,
the hacker-level entry point provides only a common access to
available hacking documention, etc. The module-specific
information is available under CFG_SITE_URL/hacking/&lt;module&gt;/.
4. Let's now return a bit more closely to the role Python and PHP
library directories outside of the Apache tree:
/opt/cds-invenio/lib/php
/opt/cds-invenio/lib/python
Here we put not only (a) libraries that may be reused across CDS
Invenio modules, but also (b) all the "core" functionality of CDS
Invenio that is not directly callable by the end users. The
"callable" functionality is put under "prefix/var/www" in case of
web scripts and documents, and under "bindir" in case of CLI
executables.
As for (a), for example in the PHP CDS Invenio library you'll find
currently the common PHP error handling code that is shared between
BibFormat and WebSubmit; in the Python CDS Invenio library (in fact,
CDS Invenio Pythonic 'module', but we are reserving the word 'module'
to denote 'CDS Invenio module' in this text) you'll find config.py
containing WML-supplied site parameters, dbquery.py containing DB
persistent query module, or webpage.py with templates and functions
to produce mod_python web pages with common look and feel. These
could and should be reused across all our modules. Note that I
created only a small number of "broad" libraries at the moment. In
case we want to reuse more code parts, we'd refactor the code more,
as needed.
As for (b), for example the existing search engine was split into
search.py that only contains three "callable" functions, which goes
into prefix/var/www, while the search engine itself is composed of
search_engine.py and search_engine_config.py living under LIBDIR.
In this way we can easily create "real" CLI search, that will
depend only on the search libraries in LIBDIR, and that will get
installed into BINDIR.
To recap:
- For each CDS Invenio module, I'm differentiating between
"callable" and "core" parts. The former go into
prefix/var/www or BINDIR, the latter into LIBDIR.
- Our PHP/Pythonic libraries contain several sorts of thing:
- the implementation of the "callable" functions
- non-callable internal "core" or "library" code parts, as
stated above. Not shared across CDS Invenio modules.
- utility code meant for reuse across CDS Invenio modules, such
as dbquery.py
- Pythonic config files out of user-supplied WML (non-MySQL)
configuration parameters (see
e.g. search_engine_config.py)
5. The same strategy is reflected in the organization of source
directories inside CDS Invenio CVS. Each CDS Invenio module lives in a
separate directory located under "modules" directory of the
sources. Further on, each module contains usually several
subdirectories that reflect the above-mentioned packaging choice.
For example, in case of WebSearch you'll find:
./modules/websearch
./modules/websearch/bin
./modules/websearch/doc
./modules/websearch/doc/hacking
./modules/websearch/doc/admin
./modules/websearch/lib
./modules/websearch/web
./modules/websearch/web/admin
with the following straightforward meaning:
- bin : for callable CLI binaries and scripts
- doc : for documentation. The user-level documentation is
located in this directory. The admin-level
documentation is located in the "admin" subdir. The
programmer-level documentation is located in the
"hacking" subdir.
- lib : for uncallable "core" functionality, see the comments
above
- web : for callable web scripts and pages. The user- and
admin- level is separated similarly as in the "doc"
directory (see above).
The structure is respected throughout all the CDS Invenio modules, a
notable exception being the MiscUtil module that contains subdirs
like "sql" (for the table creating/dropping SQL commands, etc) or
"demo" (for creation of Atlantis Institute of Science, our demo
site.)
- end of file -
</pre>
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