#!/usr/bin/env ruby
# -*- coding: binary -*-

# $Id$
# $Revision$

msfbase = __FILE__
while File.symlink?(msfbase)
	msfbase = File.expand_path(File.readlink(msfbase), File.dirname(msfbase))
end

@msfbase_dir = File.dirname(msfbase)

@args = ARGV.dup

# May be changed
@configdir = File.expand_path(File.join(File.dirname(msfbase), "data", "svn"))

Dir.chdir(@msfbase_dir)

$stderr.puts "[*]"
$stderr.puts "[*] Attempting to update the Metasploit Framework..."
$stderr.puts "[*]"
$stderr.puts ""

if not (Process.uid == 0 or File.stat(msfbase).owned?)
	$stderr.puts "[-] ERROR: User running msfupdate does not own the metasploit install"
	$stderr.puts "Please run msfupdate as the same user who installed metasploit."
end

def is_pro
	File.exists?(File.expand_path(File.join(@msfbase_dir, "..", "engine", "update.rb")))
end

def is_git
	File.directory?(File.join(@msfbase_dir, ".git"))
end

def is_svn
	File.directory?(File.join(@msfbase_dir, ".svn"))
end

# Adding an upstream enables msfupdate to pull updates from
# Rapid7's metasploit-framework repo instead of the repo
# the user originally cloned or forked.
def add_git_upstream
	$stdout.puts "[*] Attempting to add remote 'upstream' to your local git repository."
	system("git", "remote", "add", "upstream", "git://github.com/rapid7/metasploit-framework.git")
	$stdout.puts "[*] Added remote 'upstream' to your local git repository."
end

def print_deprecation_warning
	$stdout.puts "[*] Deprecation Note: The next version of Metasploit will"
	$stdout.puts "[*] update over the git protocol, which requires outbound"
	$stdout.puts "[*] access to github.com:9418/TCP."
	$stdout.puts "[*] Please adjust your egress firewall rules accordingly."
end

# Some of these args are meaningful for SVN, some for Git,
# some for both. Fun times.
@args.each_with_index do |arg,i|
	case arg
		# Handle the old wait/nowait argument behavior
	when "wait", "nowait"
		@wait_index = i
		@actually_wait = (arg == "wait")
		# An empty or absent config-dir means a default config-dir
	when "--config-dir"
		@configdir_index = i
		# A defined config dir means a defined config-dir
	when /--config-dir=(.*)?/
		# Spaces in the directory should be fine since this whole thing is passed
		# as a single argument via the multi-arg syntax for system() below.
		@configdir = $1
		@configdir_index = i
	when /--git-remote=([^\s]*)?/
		@git_remote = $1
		@git_remote_index = i
	when /--git-branch=([^\s]*)?/
		@git_branch = $1
		@git_branch_index = i
	end
end

@args[@wait_index] = nil      if @wait_index
@args[@configdir_index] = nil if @configdir_index

@args[@git_remote_index] = nil if @git_remote_index
@args[@git_branch_index] = nil if @git_branch_index
@args = @args.compact

####### Since we're SVN, do it all this way #######
if is_svn
	print_deprecation_warning
	@args.push("--config-dir=#{@configdir}")
	@args.push("--non-interactive")

	res = system("svn", "cleanup")
	if res.nil?
		$stderr.puts "[-] ERROR: Failed to run svn"
		$stderr.puts ""
		$stderr.puts "[-] If you used a binary installer, make sure you run the symlink in"
		$stderr.puts "[-] /usr/local/bin instead of running this file directly (e.g.: ./msfupdate)"
		$stderr.puts "[-] to ensure a proper environment."
		exit 1
	else
		# Cleanup worked, go ahead and update
		system("svn", "update", *@args)
	end
end

####### Since we're Git, do it all that way #######
if is_git
	out = `git remote show upstream` # Actually need the output for this one.
	add_git_upstream unless $?.success? and out =~ %r{(https|git|git@github\.com):(//github\.com/)?(rapid7/metasploit-framework\.git)}

	remote = @git_remote || "upstream"
	branch = @git_branch || "master"

	# This will save local changes in a stash, but won't
	# attempt to reapply them. If the user wants them back
	# they can always git stash pop them, and that presumes
	# they know what they're doing when they're editing local
	# checkout, which presumes they're not using msfupdate
	# to begin with.
	#
	# Note, this requires at least user.name and user.email
	# to be configured in the global git config. Installers should
	# take care that this is done. TODO: Enforce this in msfupdate
	committed = system("git", "diff", "--quiet", "HEAD")
	if committed.nil?
		$stderr.puts "[-] ERROR: Failed to run git"
		$stderr.puts ""
		$stderr.puts "[-] If you used a binary installer, make sure you run the symlink in"
		$stderr.puts "[-] /usr/local/bin instead of running this file directly (e.g.: ./msfupdate)"
		$stderr.puts "[-] to ensure a proper environment."
		exit 1
	elsif not committed
		system("git", "stash")
		$stdout.puts "[*] Stashed local changes to avoid merge conflicts."
		$stdout.puts "[*] Run `git stash pop` to reapply local changes."
	end

	system("git", "reset", "HEAD", "--hard")
	system("git", "checkout", branch)
	system("git", "fetch", remote)
	system("git", "merge", "#{remote}/#{branch}")
end

if is_pro
	update_script = File.expand_path(File.join(@msfbase_dir, "..", "engine", "update.rb"))
	system("ruby", update_script)
end

unless is_svn || is_git || is_pro
	raise RuntimeError, "Cannot determine checkout type: `#{@msfbase_dir}'"
end

if @actually_wait
	$stderr.puts ""
	$stderr.puts "[*] Please hit enter to exit"
	$stderr.puts ""
	$stdin.readline
end