gitweb: update INSTALL regarding specific snapshot settings

[git] / gitweb / INSTALL

GIT web Interface (gitweb) Installation
=======================================

First you have to generate gitweb.cgi from gitweb.perl using
"make gitweb/gitweb.cgi", then copy appropriate files (gitweb.cgi,
gitweb.css, git-logo.png and git-favicon.png) to their destination.
For example if git was (or is) installed with /usr prefix, you can do

        $ make prefix=/usr gitweb/gitweb.cgi  ;# as yourself
        # cp gitweb/git* /var/www/cgi-bin/    ;# as root

Alternatively you can use autoconf generated ./configure script to
set up path to git binaries (via config.mak.autogen), so you can write
instead

        $ make configure                     ;# as yourself
        $ ./configure --prefix=/usr          ;# as yourself
        $ make gitweb/gitweb.cgi             ;# as yourself
        # cp gitweb/git* /var/www/cgi-bin/   ;# as root

The above example assumes that your web server is configured to run
[executable] files in /var/www/cgi-bin/ as server scripts (as CGI
scripts).


Build time configuration
------------------------

See also "How to configure gitweb for your local system" in README
file for gitweb (in gitweb/README).

- There are many configuration variables which affect building of
  gitweb.cgi; see "default configuration for gitweb" section in main
  (top dir) Makefile, and instructions for building gitweb/gitweb.cgi
  target.

  One of the most important is where to find the git wrapper binary. Gitweb
  tries to find the git wrapper at $(bindir)/git, so you have to set $bindir
  when building gitweb.cgi, or $prefix from which $bindir is derived. If
  you build and install gitweb together with the rest of the git suite,
  there should be no problems. Otherwise, if git was for example
  installed from a binary package, you have to set $prefix (or $bindir)
  accordingly.

- Another important issue is where are git repositories you want to make
  available to gitweb. By default gitweb searches for repositories under
  /pub/git; if you want to have projects somewhere else, like /home/git,
  use GITWEB_PROJECTROOT build configuration variable.

  By default all git repositories under projectroot are visible and
  available to gitweb. The list of projects is generated by default by
  scanning the projectroot directory for git repositories. This can be
  changed (configured) as described in "Gitweb repositories" section
  below.

  Note that gitweb deals directly with the object database, and does not
  need a working directory; the name of the project is the name of its
  repository object database, usually projectname.git for bare
  repositories. If you want to provide gitweb access to non-bare (live)
  repositories, you can make projectname.git a symbolic link under
  projectroot linking to projectname/.git (but it is just
  a suggestion).

- You can control where gitweb tries to find its main CSS style file,
  its favicon and logo with the GITWEB_CSS, GITWEB_FAVICON and GITWEB_LOGO
  build configuration variables. By default gitweb tries to find them
  in the same directory as gitweb.cgi script.

Build example
~~~~~~~~~~~~~

- To install gitweb to /var/www/cgi-bin/gitweb/ when git wrapper
  is installed at /usr/local/bin/git and the repositories (projects)
  we want to display are under /home/local/scm, you can do

        make GITWEB_PROJECTROOT="/home/local/scm" \
             GITWEB_CSS="/gitweb/gitweb.css" \
             GITWEB_LOGO="/gitweb/git-logo.png" \
             GITWEB_FAVICON="/gitweb/git-favicon.png" \
             bindir=/usr/local/bin \
             gitweb/gitweb.cgi

        cp -fv ~/git/gitweb/gitweb.{cgi,css} \
               ~/git/gitweb/git-{favicon,logo}.png \
             /var/www/cgi-bin/gitweb/


Gitweb config file
------------------

See also "Runtime gitweb configuration" section in README file
for gitweb (in gitweb/README).

- You can configure gitweb further using the gitweb configuration file;
  by default this is a file named gitweb_config.perl in the same place as
  gitweb.cgi script. You can control the default place for the config file
  using the GITWEB_CONFIG build configuration variable, and you can set it
  using the GITWEB_CONFIG environment variable. If this file does not
  exist, gitweb looks for a system-wide configuration file, normally
  /etc/gitweb.conf. You can change the default using the
  GITWEB_CONFIG_SYSTEM build configuration variable, and override it
  through the GITWEB_CONFIG_SYSTEM environment variable.

- The gitweb config file is a fragment of perl code. You can set variables
  using "our $variable = value"; text from "#" character until the end
  of a line is ignored. See perlsyn(1) for details.

  See the top of gitweb.perl file for examples of customizable options.

Config file example
~~~~~~~~~~~~~~~~~~~

To enable blame, pickaxe search, and snapshot support, while allowing
individual projects to turn them off, put the following in your
GITWEB_CONFIG file:

        $feature{'blame'}{'default'} = [1];
        $feature{'blame'}{'override'} = 1;

        $feature{'pickaxe'}{'default'} = [1];
        $feature{'pickaxe'}{'override'} = 1;

        $feature{'snapshot'}{'default'} = ['zip', 'tgz'];
        $feature{'snapshot'}{'override'} = 1;

If you allow overriding for the snapshot feature, you can specify which
snapshot formats are globally disabled. You can also add any command line
options you want (such as setting the compression level). For instance,
you can disable Zip compressed snapshots and set GZip to run at level 6 by
adding the following lines to your $GITWEB_CONFIG:

        $known_snapshot_formats{'zip'}{'disabled'} = 1;
        $known_snapshot_formats{'tgz'}{'compressor'} = ['gzip','-6'];


Gitweb repositories
-------------------

- By default all git repositories under projectroot are visible and
  available to gitweb. The list of projects is generated by default by
  scanning the projectroot directory for git repositories (for object
  databases to be more exact).

  You can provide a pre-generated list of [visible] repositories,
  together with information about their owners (the project ownership
  defaults to the owner of the repository directory otherwise), by setting
  the GITWEB_LIST build configuration variable (or the $projects_list
  variable in the gitweb config file) to point to a plain file.

  Each line of the projects list file should consist of the url-encoded path
  to the project repository database (relative to projectroot), followed
  by the url-encoded project owner on the same line (separated by a space).
  Spaces in both project path and project owner have to be encoded as either
  '%20' or '+'.

  Other characters that have to be url-encoded, i.e. replaced by '%'
  followed by two-digit character number in octal, are: other whitespace
  characters (because they are field separator in a record), plus sign '+'
  (because it can be used as replacement for spaces), and percent sign '%'
  (which is used for encoding / escaping).

  You can generate the projects list index file using the project_index
  action (the 'TXT' link on projects list page) directly from gitweb.

- By default, even if a project is not visible on projects list page, you
  can view it nevertheless by hand-crafting a gitweb URL. You can set the
  GITWEB_STRICT_EXPORT build configuration variable (or the $strict_export
  variable in the gitweb config file) to only allow viewing of
  repositories also shown on the overview page.

- Alternatively, you can configure gitweb to only list and allow
  viewing of the explicitly exported repositories, via the
  GITWEB_EXPORT_OK build configuration variable (or the $export_ok
  variable in gitweb config file). If it evaluates to true, gitweb
  shows repositories only if this file exists in its object database
  (if directory has the magic file named $export_ok).

- Finally, it is possible to specify an arbitrary perl subroutine that
  will be called for each project to determine if it can be exported.
  The subroutine receives an absolute path to the project as its only
  parameter.

  For example, if you use mod_perl to run the script, and have dumb
  http protocol authentication configured for your repositories, you
  can use the following hook to allow access only if the user is
  authorized to read the files:

    $export_auth_hook = sub {
        use Apache2::SubRequest ();
        use Apache2::Const -compile => qw(HTTP_OK);
        my $path = "$_[0]/HEAD";
        my $r    = Apache2::RequestUtil->request;
        my $sub  = $r->lookup_file($path);
        return $sub->filename eq $path
            && $sub->status == Apache2::Const::HTTP_OK;
    };


Generating projects list using gitweb
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We assume that GITWEB_CONFIG has its default Makefile value, namely
gitweb_config.perl. Put the following in gitweb_make_index.perl file:

        $GITWEB_CONFIG = "gitweb_config.perl";
        do $GITWEB_CONFIG if -e $GITWEB_CONFIG;

        $projects_list = $projectroot;

Then create the following script to get list of project in the format
suitable for GITWEB_LIST build configuration variable (or
$projects_list variable in gitweb config):

        #!/bin/sh

        export GITWEB_CONFIG="gitweb_make_index.perl"
        export GATEWAY_INTERFACE="CGI/1.1"
        export HTTP_ACCEPT="*/*"
        export REQUEST_METHOD="GET"
        export QUERY_STRING="a=project_index"

        perl -- /var/www/cgi-bin/gitweb.cgi


Requirements
------------

 - Core git tools
 - Perl
 - Perl modules: CGI, Encode, Fcntl, File::Find, File::Basename.
 - web server


Example web server configuration
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

See also "Webserver configuration" section in README file for gitweb
(in gitweb/README).


- Apache2, gitweb installed as CGI script,
  under /var/www/cgi-bin/

        ScriptAlias /cgi-bin/ "/var/www/cgi-bin/"

        <Directory "/var/www/cgi-bin">
            Options Indexes FollowSymlinks ExecCGI
            AllowOverride None
            Order allow,deny
            Allow from all
        </Directory>

- Apache2, gitweb installed as mod_perl legacy script,
  under /var/www/perl/

        Alias /perl "/var/www/perl"

        <Directory "/var/www/perl">
            SetHandler perl-script
            PerlResponseHandler ModPerl::Registry
            PerlOptions +ParseHeaders
            Options Indexes FollowSymlinks +ExecCGI
            AllowOverride None
            Order allow,deny
            Allow from all
        </Directory>