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gitpub.rb
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#!/usr/bin/ruby
# -*- coding: utf-8 -*-
# = gitpub.rb
#
# Web application to publish static files based on git and rack.
#
# Pub means 'publish' and supporting only static files like publicfile of DJB.
#
# == Example Usage
#
# execute some commands:
# gem install rack
# git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
# rackup -d linux-2.6.ru
# and open http://localhost:9292/ with your browser.
#
# linux-2.6.ru is:
# require 'gitpub'
# run GitPub.new('linux-2.6/.git', /\Av2\.6\.\d+\z/)
#
#
# == License (The MIT License)
#
# Copyright (c) 2009 Kazuhiro NISHIYAMA
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
require 'erb'
require 'rack/mime'
class GitPub
include ERB::Util
# path to git command
GIT_BIN = "git"
# Create GitPub instance.
#
# git_dir :: path to .git or git bare repository.
# pub_tag_regexp :: Regexp of publish tag.
# Recommends use \A and \z instead of ^ and $.
# title :: HTML title prefix. Default is repository's directory name.
def initialize(git_dir, pub_tag_regexp=/\A([^\/:]+)\z/, title=nil)
@git_dir = git_dir
@pub_tag_regexp = pub_tag_regexp
unless title
title = File.basename(git_dir)
if title == ".git"
title = File.basename(File.dirname(git_dir))
end
end
@title = title
end
# Wrapper of git command.
def git(*args)
IO.popen("-", "r") do |io|
if io
yield io
else
#STDERR.puts [GIT_BIN, "--git-dir", @git_dir, *args].inspect
exec(GIT_BIN, "--git-dir", @git_dir, *args)
end
end
end
private :git
# List public tags.
def list_pub_tag(env, res)
tags = []
git("tag") do |io|
io.each_line do |line|
line.chomp!
if @pub_tag_regexp =~ line
tags << $&
end
end
end
tags.sort!
E_list_pub_tag.result(binding)
end
# ERB template of list_pub_tag.
E_list_pub_tag = ERB.new(<<-ERUBY, 1, '-')
<html>
<head>
<title><%=h @title %></title>
</head>
<body>
<h1><%=h @title %></h1>
<ul>
<%- tags.each do |tag| -%>
<li><a href="<%=h tag %>/"><%=h tag %></a></li>
<%- end -%>
</ul>
</body>
</html>
ERUBY
# List files in the blob (tag or directory)
def list_files(env, res, tag, path)
files = []
git("ls-tree", "-z", "#{tag}:#{path}") do |io|
io.each_line("\0") do |line|
line.chomp!("\0")
#STDERR.puts line
info, file = line.split(/\t/, 2)
mode, type, object = info.split(/ /)
files << {
:mode => mode,
:type => type,
:object => object,
:file => file,
}
end
end
files = files.sort_by{|h| h[:file] }
E_list_files.result(binding)
end
# ERB template of list_files.
E_list_files = ERB.new(<<-ERUBY, 1, '-')
<html>
<head>
<title><%=h @title %> <%=h tag %>:<%=h path %></title>
</head>
<body>
<h1><%=h @title %> <%=h tag %>:<%=h path %></h1>
<ol>
<li><a href="..">..</a></li>
<%- files.each do |h| -%>
<%- case h[:type] -%>
<%- when "tree" -%>
<li><a href="<%=h h[:file] %>/"><%=h h[:file] %>/</a></li>
<%- when "blob" -%>
<li><a href="<%=h h[:file] %>"><%=h h[:file] %></a></li>
<%- else -%>
<li><%=h h[:file] %></li>
<%- end -%>
<%- end -%>
</ol>
</body>
</html>
ERUBY
# Show file content of object.
# Content-Type choose by Rack::Mime.mime_type of file extension.
# Default is text/plain.
def show_file(env, res, tag, path)
body = "(empty)"
git("show", "#{tag}:#{path}") do |io|
body = io.read
end
mime_type = Rack::Mime.mime_type(File.extname(path), "text/plain")
if mime_type != "text/plain"
res.write body
res['Content-Type'] = mime_type
return
end
E_show_file.result(binding)
end
# ERB template of show_file.
E_show_file = ERB.new(<<-ERUBY, 1, '-')
<html>
<head>
<title><%=h @title %> <%=h tag %>:<%=h path %></title>
</head>
<body>
<h1><%=h @title %> <%=h tag %>:<%=h path %></h1>
<p><a href=".">back</a><p>
<pre><%=h body %></pre>
</body>
</html>
ERUBY
# Rack interface.
def call(env)
res = Rack::Response.new
body = nil
if /\A\/([^\/:]+)\// =~ env['PATH_INFO']
tag, rest = $1, $'
end
if tag && @pub_tag_regexp =~ tag
if /\/\z/ =~ env['PATH_INFO']
body = list_files(env, res, tag, rest)
else
body = show_file(env, res, tag, rest)
end
else
body = list_pub_tag(env, res)
end
if body
res.write body
res['Content-Type'] = 'text/html; charset=utf-8'
end
res.finish
end
end