LXR Server With Multiple Projects

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Install LXR on Ubuntu 16.04

In this article, I will write down a example to descrip how to setup the LXR(Linux Cross Reference) with multiple projects support. In this configuration, your can view multiple projects’ refernce in one LXR service.
For this article, I use the Ceph and DRBD for my LXR projtects.

Environment

Prepare LXN Environment

  1. Install the required softwared
    • perl (5.10 or above version)
    • ctags (5.8 or above version)
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apt-get install perl
apt-get install exuberant-ctags
  1. Install the Datbase, I choosed the MySQL for my lxr env.
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apt-get install mysql-server
  1. Install Perl DBI
    • Install the CPAN for Perl.
    • Type the following command to install DBI
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cpan DBI
  1. Install the Web Server, I choose the Apacher for my lxr env.
    • Also install perl module.
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apt-get install apache2
apt-get install libapache2-mod-perl2
  1. Install free-text searching engine, I choose Glimpse.
    • Download from the github page and follow the README.install to install.
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git clone https://github.com/gvelez17/glimpse
cd glimpse
./configure
make
make install
  1. Install Perl Module
    • File::MMagic
    • DBD::mysql
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apt-get install libmysqlclient-dev
cpan File::MMagic
cpan DBD::mysql

Install LXR

  1. Download the LXR-2.2.1 and expand the tarball
    • Download from lxr-2.2.1.tgz
    • Decompress into the /opt direcotory (choose the path you like) and rename to lxr
  2. Check the environment
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cd /opt/lxr
./genxref --checkonly

The result will like below.

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ERROR: could not open configuration file lxr.conf
[  OK  ]     Perl     version ... 5.22.1
Parameter 'ectagsbin' not defined - trying to find ctags
ctags found at /usr/bin/ctags
[  OK  ]     ctags    version ... 5.9
Parameter 'glimpsebin' not defined - trying to find glimpse
glimpse found at /usr/local/bin/glimpse
Checked:    glimpse   version ... 4.18.7
Parameter 'glimpseindex' not defined - trying to find glimpseindex
glimpseindex found at /usr/local/bin/glimpseindex
Checked: glimpseindex version ... 4.18.7
Parameter 'swishbin' not defined - trying to find swish-e
swish-e not found, `command -v swish-e` returned a null string
genxref stopped without indexing by --checkonly option

Since we have not config the LXR, we won’t have the lxr.conf.
We choose the glimpse as our search engine and we can ignore the warning of swish-e.

Configure LXR

  1. Since the GIT type of source project doesn’t support the submodule reference in LXR, we use FILE instead of. Before we generate the code reference, we should update code by ourself.
  2. Prepare the source fo DRBD and CEPH. I put them in /opt/lxr/source_code
    • We refer to the master branch of ceph, for rdbe, is version 9.0.
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mkdir -p /opt/lxr/source_code/drbd
mkdir -p /opt/lxr/source_code/ceph
git clone --recursive http://git.drbd.org/drbd-9.0.git /opt/lxr/source_code/drbd/9.0
git clone --recursive http://git.drbd.org/drbd-9.0.git/tags  /opt/lxr/source_code/ceph/master
  1. Create both LXR and database configuration via tool configure-lxr.pl
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cd /opt/lxr
./scripts/configure-lxr.pl -vv
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*** LXR configurator (version: 2.2) ***

LXR root directory is /opt/lxr
Configuration will be stored in custom.d/

Configure for single/multiple trees? [S/m] > m

*** LXR web server configuration ***

Many different configurations are possible, they are related to the way
LXR service is accessed, i.e. to the structure of the URL.
Refer to the User's Manual for a description of the variants.

LXR can be located at the server-root (so called dedicated)
or lower in the server hierarchy (shared because there are
usually other pages or sections).
Server type? [dedicated/SHARED] > SHARED

Selecting which tree to display can be done in various ways:
  1. from the host name (all names are different),
  2. from a prefix to a common host name (similar to previous)
  3. from the site section name (all different)
  4. from interpretation of a section name part (similar to previous)
  5. from the head of script arguments
Method 5 is highly recommended because it has no impact on webserver
  configuration.
Method 3 is second choice but involves manually setting up many
  symbolic links (one per source-tree).
Method 1 & 2 do not involve symbolic links but need populating webserver
  configuration with virtual hosts.
  Note that method 2 does not work well on //localhost.
Method 4 is deprecated because it has proved not easily portable
  under alternate webservers (other than Apache).

Tree designation?:
   ARGUMENT
   section name
   prefix in hos
   hostname
   embedded in section
 > ARGUMENT

The computer hosting the server is described by an URL.
The form is scheme://host_name:port
where:
  - scheme is either http or https (http: can be omitted),
  - host_name can be given as an IP address such as 123.45.67.89
              or a domain name like localhost or lxr.url.example,
  - port may be omitted if standard for the scheme.
--- Host name or IP? [//localhost] > //127.0.0.1
--- Alias name or IP? > 
URL section name for LXR in your server? [/lxr] > /lxr
Will it be shared by all trees? [YES/no] > 

*** LXR database configuration ***


The choice of the database engine can make a difference in indexing performance,
but resource consumption is also an important factor.
  * For a small personal project, try SQLite which do not
    need a server and is free from configuration burden.
  * For medium to large projects, choice is between MySQL,
    PostgreSQL and Oracle.
    Oracle is not a free software, its interface has not been
    tested for a long time.
  * PostgreSQL databases are smaller than MySQL's
    and performance is roughly equivalent.
  * MySQL is at its best with large-sized projects
    (such as kernel cross-referencing) where it is fastest at the cost
    of bigger databases.
  * Take also in consideration the number of connected users.
Database engine? [MYSQL/oracle/postgres/sqlite] > 
The safest option is to create one database per tree.
You can however create a single database for all your trees with a specific set of
tables for each tree (though this is not recommended).
How do you setup the databases? [PER TREE/global] > 
All databases can be accessed with the same username and
can also be described under the same names.
Will you share database characteristics? [YES/no] > 
Will you use the same username and password for all DBs? [YES/no] > 
--- DB user name? [lxr] > lxr
--- DB password ? [lxrpw] > lxrpw
Will you give the same prefix to all tables? [YES/no] > 
--- Common table prefix? [lxr_] > 
--- Directory for glimpse databases? > /opt/lxr/glimpse_db

file .htaccess written into LXR root directory
file apache2-require.pl written into configuration directory
file apache-lxrserver.conf written into configuration directory
file lighttpd-lxrserver.conf written into configuration directory
file nginx-lxrserver.conf written into configuration directory
file thttpd-lxrserver.conf written into configuration directory
Mercurial support files written into configuration directory

*** LXR master configuration file setup ***
    Global section part

*** Configuring auxiliary tool paths
*** Host name previously defined as http://104.154.246.9
*** Configuring HTML parameters
*** 'Buttons-and-menus' interface is recommended for the kernel
*** to avoid screen cluttering.
--- Use 'buttons-and-menus' instead of 'link' interface? [YES/no] > 
*** Configuring file subsection
*** Configuring "common factors"
*** Marking tree section

*** LXR master configuration file setup ***
    Tree section part
    SQL script for database initialisation

*** Configuring LXR server parameters
*** The virtual root is the fixed URL part after the hostname.
*** You previously defined the virtual root as /lxr
--- Caption in page header? (e.g. Project XYZZY displayed by LXR) > drbd
Do you want a speed switch button for this tree ? [YES/no] > 
--- Short title for button? (e.g. XYZZY) > drbd
--- Tree identification in URL? (e.g. the-tree) > drbd
Do you need a specific encoding for this tree ? [yes/NO] > 
*** Describing tree location
How is your tree stored? [FILES/cvs/git/svn/hg/bk] > 
*** A source directory contains one sub-directory for every version.
--- Source directory? (e.g. /home/myself/project-tree) > /opt/lxr/source_code/drbd
Name to display for the path root? (e.g. Project or $v for version) [$v] > 
*** Enumerating versions
Label for version selection menu?  [Version] > 
*** Versions can be explicitly enumerated, be read from a file or computed
*** by a function. The latter case is recommended for VCS-stored trees.
Version enumeration method? [LIST/file/function] > 
--- Version name?  > 
No default choice, try again...
--- Version name?  > 0.9 
--- Version name? (hit return to stop) > 
*** By default, first version in list is displayed. You may also indicate
*** a prefered version.
--- Default displayed version is first in 'range'? [YES/no] > 
*** Setting directory lists
*** Some directories may contain non-public project data (binaries,
*** compilers caches, SCM control data, ...). They can be hidden from LXR.
--- Directory to ignore, e.g. CVSROOT or CVS? (hit return to stop) > 
*** If your source code uses "include" statements (#include, require, ...)
*** LXR needs hints to resolve the destination file.
--- Include directory, e.g. /include? (hit return to stop) > 
*** Configuring data storage
--- Database name? > drbd
Do you want to override the global 'lxr' user name? [yes/NO] > 
Do you want to override the global 'lxr_' table prefix? [yes/NO] > 

*** Configure another tree? [YES/no] > 
        , 'shortcaption' => 'drbd'
*** Configuring LXR server parameters
*** The virtual root is the fixed URL part after the hostname.
*** You previously defined the virtual root as /lxr
--- Caption in page header? (e.g. Project XYZZY displayed by LXR) > Ceph
Do you want a speed switch button for this tree ? [YES/no] >   
--- Short title for button? (e.g. XYZZY) > Ceph
--- Tree identification in URL? (e.g. the-tree) > Ceph
Do you need a specific encoding for this tree ? [yes/NO] > 
*** Describing tree location
How is your tree stored? [FILES/cvs/git/svn/hg/bk] > 
*** A source directory contains one sub-directory for every version.
--- Source directory? (e.g. /home/myself/project-tree) > /opt/lxr/source_code/ceph/
Name to display for the path root? (e.g. Project or $v for version) [$v] > 
*** Enumerating versions
Label for version selection menu?  [Version] > 
*** Versions can be explicitly enumerated, be read from a file or computed
*** by a function. The latter case is recommended for VCS-stored trees.
Version enumeration method? [LIST/file/function] > 
--- Version name?  > master
--- Version name? (hit return to stop) > 
*** By default, first version in list is displayed. You may also indicate
*** a prefered version.
--- Default displayed version is first in 'range'? [YES/no] > 
*** Setting directory lists
*** Some directories may contain non-public project data (binaries,
*** compilers caches, SCM control data, ...). They can be hidden from LXR.
--- Directory to ignore, e.g. CVSROOT or CVS? (hit return to stop) > 
*** If your source code uses "include" statements (#include, require, ...)
*** LXR needs hints to resolve the destination file.
--- Include directory, e.g. /include? (hit return to stop) > 
*** Configuring data storage
--- Database name? > ceph
Do you want to override the global 'lxr' user name? [yes/NO] > 
Do you want to override the global 'lxr_' table prefix? [yes/NO] > 

*** Configure another tree? [YES/no] > no
  1. Initail DB via tool initdb.sh
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./custom.d/initdb.sh
  1. Copy the lxr.conf from custom.d dir to root dir.
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cp ./custom.d/lxr.conf .

Generate Reference

  • Generate the reference of project ceph
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./genxref --url=http://localhost/lxr --tree=Ceph --version=master
  • Generate the reference of project drbd
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./genxref --url=http://localhost/lxr --tree=drbd --version=9.0

Setup WEB Server

  1. Copy the server config to apache2 configuration dir.
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cp apache-lxrserver.conf  /etc/apache2/conf-available
a2enconf apache-lxrserver.conf
  1. Start the apache2
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service apaceh2 start

Test

  1. Go to http://localhost/lxr and your see there’re two options there, ceph and drbd.
  2. choose any one of them and you can use that to help you trace the code now.

Reference

  1. [LXR] (http://lxr.sourceforge.net/en/1-0-InstallSteps/1-0-install1tools.php)
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