git-instaweb.sh - jrn/git - Git at Google

 #!/bin/sh
 #
 # Copyright (c) 2006 Eric Wong
 #

 PERL='@@PERL@@'
 OPTIONS_KEEPDASHDASH=
 OPTIONS_STUCKLONG=
 OPTIONS_SPEC="\
 git instaweb [options] (--start | --stop | --restart)
 --
 l,local        only bind on 127.0.0.1
 p,port=        the port to bind to
 d,httpd=       the command to launch
 b,browser=     the browser to launch
 m,module-path= the module path (only needed for apache2)
  Action
 stop           stop the web server
 start          start the web server
 restart        restart the web server
 "

 . git-sh-setup

 fqgitdir="$GIT_DIR"
 local="$(git config --bool --get instaweb.local)"
 httpd="$(git config --get instaweb.httpd)"
 root="$(git config --get instaweb.gitwebdir)"
 port=$(git config --get instaweb.port)
 module_path="$(git config --get instaweb.modulepath)"
 action="browse"

 conf="$GIT_DIR/gitweb/httpd.conf"

 # Defaults:

 # if installed, it doesn't need further configuration (module_path)
 test -z "$httpd" && httpd='lighttpd -f'

 # Default is @@GITWEBDIR@@
 test -z "$root" && root='@@GITWEBDIR@@'

 # any untaken local port will do...
 test -z "$port" && port=1234

 resolve_full_httpd () {
 	case "$httpd" in
 	*apache2*|*lighttpd*|*httpd*)
 		# yes, *httpd* covers *lighttpd* above, but it is there for clarity
 		# ensure that the apache2/lighttpd command ends with "-f"
 		if ! echo "$httpd" | sane_grep -- '-f *$' >/dev/null 2>&1
 		then
 			httpd="$httpd -f"
 		fi
 		;;
 	*plackup*)
 		# server is started by running via generated gitweb.psgi in $fqgitdir/gitweb
 		full_httpd="$fqgitdir/gitweb/gitweb.psgi"
 		httpd_only="${httpd%% *}" # cut on first space
 		return
 		;;
 	*webrick*)
 		# server is started by running via generated webrick.rb in
 		# $fqgitdir/gitweb
 		full_httpd="$fqgitdir/gitweb/webrick.rb"
 		httpd_only="${httpd%% *}" # cut on first space
 		return
 		;;
 	esac

 	httpd_only="$(echo $httpd | cut -f1 -d' ')"
 	if case "$httpd_only" in /*) : ;; *) which $httpd_only >/dev/null 2>&1;; esac
 	then
 		full_httpd=$httpd
 	else
 		# many httpds are installed in /usr/sbin or /usr/local/sbin
 		# these days and those are not in most users $PATHs
 		# in addition, we may have generated a server script
 		# in $fqgitdir/gitweb.
 		for i in /usr/local/sbin /usr/sbin "$root" "$fqgitdir/gitweb"
 		do
 			if test -x "$i/$httpd_only"
 			then
 				full_httpd=$i/$httpd
 				return
 			fi
 		done

 		echo >&2 "$httpd_only not found. Install $httpd_only or use" \
 		     "--httpd to specify another httpd daemon."
 		exit 1
 	fi
 }

 start_httpd () {
 	if test -f "$fqgitdir/pid"; then
 		say "Instance already running. Restarting..."
 		stop_httpd
 	fi

 	# here $httpd should have a meaningful value
 	resolve_full_httpd
 	mkdir -p "$fqgitdir/gitweb/$httpd_only"
 	conf="$fqgitdir/gitweb/$httpd_only.conf"

 	# generate correct config file if it doesn't exist
 	test -f "$conf" || configure_httpd
 	test -f "$fqgitdir/gitweb/gitweb_config.perl" || gitweb_conf

 	# don't quote $full_httpd, there can be arguments to it (-f)
 	case "$httpd" in
 	*mongoose*|*plackup*)
 		#These servers don't have a daemon mode so we'll have to fork it
 		$full_httpd "$conf" &
 		#Save the pid before doing anything else (we'll print it later)
 		pid=$!

 		if test $? != 0; then
 			echo "Could not execute http daemon $httpd."
 			exit 1
 		fi

 		cat > "$fqgitdir/pid" <<EOF
 $pid
 EOF
 		;;
 	*)
 		$full_httpd "$conf"
 		if test $? != 0; then
 			echo "Could not execute http daemon $httpd."
 			exit 1
 		fi
 		;;
 	esac
 }

 stop_httpd () {
 	test -f "$fqgitdir/pid" && kill $(cat "$fqgitdir/pid")
 	rm -f "$fqgitdir/pid"
 }

 httpd_is_ready () {
 	"$PERL" -MIO::Socket::INET -e "
 local \$| = 1; # turn on autoflush
 exit if (IO::Socket::INET->new('127.0.0.1:$port'));
 print 'Waiting for \'$httpd\' to start ..';
 do {
 	print '.';
 	sleep(1);
 } until (IO::Socket::INET->new('127.0.0.1:$port'));
 print qq! (done)\n!;
 "
 }

 while test $# != 0
 do
 	case "$1" in
 	--stop|stop)
 		action="stop"
 		;;
 	--start|start)
 		action="start"
 		;;
 	--restart|restart)
 		action="restart"
 		;;
 	-l|--local)
 		local=true
 		;;
 	-d|--httpd)
 		shift
 		httpd="$1"
 		;;
 	-b|--browser)
 		shift
 		browser="$1"
 		;;
 	-p|--port)
 		shift
 		port="$1"
 		;;
 	-m|--module-path)
 		shift
 		module_path="$1"
 		;;
 	--)
 		;;
 	*)
 		usage
 		;;
 	esac
 	shift
 done

 mkdir -p "$GIT_DIR/gitweb/tmp"
 GIT_EXEC_PATH="$(git --exec-path)"
 GIT_DIR="$fqgitdir"
 GITWEB_CONFIG="$fqgitdir/gitweb/gitweb_config.perl"
 export GIT_EXEC_PATH GIT_DIR GITWEB_CONFIG

 webrick_conf () {
 	# webrick seems to have no way of passing arbitrary environment
 	# variables to the underlying CGI executable, so we wrap the
 	# actual gitweb.cgi using a shell script to force it
   wrapper="$fqgitdir/gitweb/$httpd/wrapper.sh"
 	cat > "$wrapper" <<EOF
 #!/bin/sh
 # we use this shell script wrapper around the real gitweb.cgi since
 # there appears to be no other way to pass arbitrary environment variables
 # into the CGI process
 GIT_EXEC_PATH=$GIT_EXEC_PATH GIT_DIR=$GIT_DIR GITWEB_CONFIG=$GITWEB_CONFIG
 export GIT_EXEC_PATH GIT_DIR GITWEB_CONFIG
 exec $root/gitweb.cgi
 EOF
 	chmod +x "$wrapper"

 	# This assumes _ruby_ is in the user's $PATH. that's _one_
 	# portable way to run ruby, which could be installed anywhere, really.
 	# generate a standalone server script in $fqgitdir/gitweb.
 	cat >"$fqgitdir/gitweb/$httpd.rb" <<EOF
 #!/usr/bin/env ruby
 require 'webrick'
 require 'logger'
 options = {
   :Port => $port,
   :DocumentRoot => "$root",
   :Logger => Logger.new('$fqgitdir/gitweb/error.log'),
   :AccessLog => [
     [ Logger.new('$fqgitdir/gitweb/access.log'),
       WEBrick::AccessLog::COMBINED_LOG_FORMAT ]
   ],
   :DirectoryIndex => ["gitweb.cgi"],
   :CGIInterpreter => "$wrapper",
   :StartCallback => lambda do
     File.open("$fqgitdir/pid", "w") { |f| f.puts Process.pid }
   end,
   :ServerType => WEBrick::Daemon,
 }
 options[:BindAddress] = '127.0.0.1' if "$local" == "true"
 server = WEBrick::HTTPServer.new(options)
 ['INT', 'TERM'].each do |signal|
   trap(signal) {server.shutdown}
 end
 server.start
 EOF
 	chmod +x "$fqgitdir/gitweb/$httpd.rb"
 	# configuration is embedded in server script file, webrick.rb
 	rm -f "$conf"
 }

 lighttpd_conf () {
 	cat > "$conf" <<EOF
 server.document-root = "$root"
 server.port = $port
 server.modules = ( "mod_setenv", "mod_cgi" )
 server.indexfiles = ( "gitweb.cgi" )
 server.pid-file = "$fqgitdir/pid"
 server.errorlog = "$fqgitdir/gitweb/$httpd_only/error.log"

 # to enable, add "mod_access", "mod_accesslog" to server.modules
 # variable above and uncomment this
 #accesslog.filename = "$fqgitdir/gitweb/$httpd_only/access.log"

 setenv.add-environment = ( "PATH" => env.PATH, "GITWEB_CONFIG" => env.GITWEB_CONFIG )

 cgi.assign = ( ".cgi" => "" )

 # mimetype mapping
 mimetype.assign             = (
   ".pdf"          =>      "application/pdf",
   ".sig"          =>      "application/pgp-signature",
   ".spl"          =>      "application/futuresplash",
   ".class"        =>      "application/octet-stream",
   ".ps"           =>      "application/postscript",
   ".torrent"      =>      "application/x-bittorrent",
   ".dvi"          =>      "application/x-dvi",
   ".gz"           =>      "application/x-gzip",
   ".pac"          =>      "application/x-ns-proxy-autoconfig",
   ".swf"          =>      "application/x-shockwave-flash",
   ".tar.gz"       =>      "application/x-tgz",
   ".tgz"          =>      "application/x-tgz",
   ".tar"          =>      "application/x-tar",
   ".zip"          =>      "application/zip",
   ".mp3"          =>      "audio/mpeg",
   ".m3u"          =>      "audio/x-mpegurl",
   ".wma"          =>      "audio/x-ms-wma",
   ".wax"          =>      "audio/x-ms-wax",
   ".ogg"          =>      "application/ogg",
   ".wav"          =>      "audio/x-wav",
   ".gif"          =>      "image/gif",
   ".jpg"          =>      "image/jpeg",
   ".jpeg"         =>      "image/jpeg",
   ".png"          =>      "image/png",
   ".xbm"          =>      "image/x-xbitmap",
   ".xpm"          =>      "image/x-xpixmap",
   ".xwd"          =>      "image/x-xwindowdump",
   ".css"          =>      "text/css",
   ".html"         =>      "text/html",
   ".htm"          =>      "text/html",
   ".js"           =>      "text/javascript",
   ".asc"          =>      "text/plain",
   ".c"            =>      "text/plain",
   ".cpp"          =>      "text/plain",
   ".log"          =>      "text/plain",
   ".conf"         =>      "text/plain",
   ".text"         =>      "text/plain",
   ".txt"          =>      "text/plain",
   ".dtd"          =>      "text/xml",
   ".xml"          =>      "text/xml",
   ".mpeg"         =>      "video/mpeg",
   ".mpg"          =>      "video/mpeg",
   ".mov"          =>      "video/quicktime",
   ".qt"           =>      "video/quicktime",
   ".avi"          =>      "video/x-msvideo",
   ".asf"          =>      "video/x-ms-asf",
   ".asx"          =>      "video/x-ms-asf",
   ".wmv"          =>      "video/x-ms-wmv",
   ".bz2"          =>      "application/x-bzip",
   ".tbz"          =>      "application/x-bzip-compressed-tar",
   ".tar.bz2"      =>      "application/x-bzip-compressed-tar",
   ""              =>      "text/plain"
  )
 EOF
 	test x"$local" = xtrue && echo 'server.bind = "127.0.0.1"' >> "$conf"
 }

 apache2_conf () {
 	if test -z "$module_path"
 	then
 		test -d "/usr/lib/httpd/modules" &&
 			module_path="/usr/lib/httpd/modules"
 		test -d "/usr/lib/apache2/modules" &&
 			module_path="/usr/lib/apache2/modules"
 	fi
 	bind=
 	test x"$local" = xtrue && bind='127.0.0.1:'
 	echo 'text/css css' > "$fqgitdir/mime.types"
 	cat > "$conf" <<EOF
 ServerName "git-instaweb"
 ServerRoot "$root"
 DocumentRoot "$root"
 ErrorLog "$fqgitdir/gitweb/$httpd_only/error.log"
 CustomLog "$fqgitdir/gitweb/$httpd_only/access.log" combined
 PidFile "$fqgitdir/pid"
 Listen $bind$port
 EOF

 	for mod in mpm_event mpm_prefork mpm_worker
 	do
 		if test -e $module_path/mod_${mod}.so
 		then
 			echo "LoadModule ${mod}_module " \
 			     "$module_path/mod_${mod}.so" >> "$conf"
 			# only one mpm module permitted
 			break
 		fi
 	done
 	for mod in mime dir env log_config authz_core
 	do
 		if test -e $module_path/mod_${mod}.so
 		then
 			echo "LoadModule ${mod}_module " \
 			     "$module_path/mod_${mod}.so" >> "$conf"
 		fi
 	done
 	cat >> "$conf" <<EOF
 TypesConfig "$fqgitdir/mime.types"
 DirectoryIndex gitweb.cgi
 EOF

 	# check to see if Dennis Stosberg's mod_perl compatibility patch
 	# (<20060621130708.Gcbc6e5c@leonov.stosberg.net>) has been applied
 	if test -f "$module_path/mod_perl.so" &&
 	   sane_grep 'MOD_PERL' "$root/gitweb.cgi" >/dev/null
 	then
 		# favor mod_perl if available
 		cat >> "$conf" <<EOF
 LoadModule perl_module $module_path/mod_perl.so
 PerlPassEnv GIT_DIR
 PerlPassEnv GIT_EXEC_PATH
 PerlPassEnv GITWEB_CONFIG
 <Location /gitweb.cgi>
 	SetHandler perl-script
 	PerlResponseHandler ModPerl::Registry
 	PerlOptions +ParseHeaders
 	Options +ExecCGI
 </Location>
 EOF
 	else
 		# plain-old CGI
 		resolve_full_httpd
 		list_mods=$(echo "$full_httpd" | sed 's/-f$/-l/')
 		$list_mods | sane_grep 'mod_cgi\.c' >/dev/null 2>&1 || \
 		if test -f "$module_path/mod_cgi.so"
 		then
 			echo "LoadModule cgi_module $module_path/mod_cgi.so" >> "$conf"
 		else
 			$list_mods | grep 'mod_cgid\.c' >/dev/null 2>&1 || \
 			if test -f "$module_path/mod_cgid.so"
 			then
 				echo "LoadModule cgid_module $module_path/mod_cgid.so" \
 					>> "$conf"
 			else
 				echo "You have no CGI support!"
 				exit 2
 			fi
 			echo "ScriptSock logs/gitweb.sock" >> "$conf"
 		fi
 		cat >> "$conf" <<EOF
 PassEnv GIT_DIR
 PassEnv GIT_EXEC_PATH
 PassEnv GITWEB_CONFIG
 AddHandler cgi-script .cgi
 <Location /gitweb.cgi>
 	Options +ExecCGI
 </Location>
 EOF
 	fi
 }

 mongoose_conf() {
 	cat > "$conf" <<EOF
 # Mongoose web server configuration file.
 # Lines starting with '#' and empty lines are ignored.
 # For detailed description of every option, visit
 # http://code.google.com/p/mongoose/wiki/MongooseManual

 root		$root
 ports		$port
 index_files	gitweb.cgi
 #ssl_cert	$fqgitdir/gitweb/ssl_cert.pem
 error_log	$fqgitdir/gitweb/$httpd_only/error.log
 access_log	$fqgitdir/gitweb/$httpd_only/access.log

 #cgi setup
 cgi_env		PATH=$PATH,GIT_DIR=$GIT_DIR,GIT_EXEC_PATH=$GIT_EXEC_PATH,GITWEB_CONFIG=$GITWEB_CONFIG
 cgi_interp	$PERL
 cgi_ext		cgi,pl

 # mimetype mapping
 mime_types	.gz=application/x-gzip,.tar.gz=application/x-tgz,.tgz=application/x-tgz,.tar=application/x-tar,.zip=application/zip,.gif=image/gif,.jpg=image/jpeg,.jpeg=image/jpeg,.png=image/png,.css=text/css,.html=text/html,.htm=text/html,.js=text/javascript,.c=text/plain,.cpp=text/plain,.log=text/plain,.conf=text/plain,.text=text/plain,.txt=text/plain,.dtd=text/xml,.bz2=application/x-bzip,.tbz=application/x-bzip-compressed-tar,.tar.bz2=application/x-bzip-compressed-tar
 EOF
 }

 plackup_conf () {
 	# generate a standalone 'plackup' server script in $fqgitdir/gitweb
 	# with embedded configuration; it does not use "$conf" file
 	cat > "$fqgitdir/gitweb/gitweb.psgi" <<EOF
 #!$PERL

 # gitweb - simple web interface to track changes in git repositories
 #          PSGI wrapper and server starter (see http://plackperl.org)

 use strict;

 use IO::Handle;
 use Plack::MIME;
 use Plack::Builder;
 use Plack::App::WrapCGI;
 use CGI::Emulate::PSGI 0.07; # minimum version required to work with gitweb

 # mimetype mapping (from lighttpd_conf)
 Plack::MIME->add_type(
 	".pdf"          =>      "application/pdf",
 	".sig"          =>      "application/pgp-signature",
 	".spl"          =>      "application/futuresplash",
 	".class"        =>      "application/octet-stream",
 	".ps"           =>      "application/postscript",
 	".torrent"      =>      "application/x-bittorrent",
 	".dvi"          =>      "application/x-dvi",
 	".gz"           =>      "application/x-gzip",
 	".pac"          =>      "application/x-ns-proxy-autoconfig",
 	".swf"          =>      "application/x-shockwave-flash",
 	".tar.gz"       =>      "application/x-tgz",
 	".tgz"          =>      "application/x-tgz",
 	".tar"          =>      "application/x-tar",
 	".zip"          =>      "application/zip",
 	".mp3"          =>      "audio/mpeg",
 	".m3u"          =>      "audio/x-mpegurl",
 	".wma"          =>      "audio/x-ms-wma",
 	".wax"          =>      "audio/x-ms-wax",
 	".ogg"          =>      "application/ogg",
 	".wav"          =>      "audio/x-wav",
 	".gif"          =>      "image/gif",
 	".jpg"          =>      "image/jpeg",
 	".jpeg"         =>      "image/jpeg",
 	".png"          =>      "image/png",
 	".xbm"          =>      "image/x-xbitmap",
 	".xpm"          =>      "image/x-xpixmap",
 	".xwd"          =>      "image/x-xwindowdump",
 	".css"          =>      "text/css",
 	".html"         =>      "text/html",
 	".htm"          =>      "text/html",
 	".js"           =>      "text/javascript",
 	".asc"          =>      "text/plain",
 	".c"            =>      "text/plain",
 	".cpp"          =>      "text/plain",
 	".log"          =>      "text/plain",
 	".conf"         =>      "text/plain",
 	".text"         =>      "text/plain",
 	".txt"          =>      "text/plain",
 	".dtd"          =>      "text/xml",
 	".xml"          =>      "text/xml",
 	".mpeg"         =>      "video/mpeg",
 	".mpg"          =>      "video/mpeg",
 	".mov"          =>      "video/quicktime",
 	".qt"           =>      "video/quicktime",
 	".avi"          =>      "video/x-msvideo",
 	".asf"          =>      "video/x-ms-asf",
 	".asx"          =>      "video/x-ms-asf",
 	".wmv"          =>      "video/x-ms-wmv",
 	".bz2"          =>      "application/x-bzip",
 	".tbz"          =>      "application/x-bzip-compressed-tar",
 	".tar.bz2"      =>      "application/x-bzip-compressed-tar",
 	""              =>      "text/plain"
 );

 my \$app = builder {
 	# to be able to override \$SIG{__WARN__} to log build time warnings
 	use CGI::Carp; # it sets \$SIG{__WARN__} itself

 	my \$logdir = "$fqgitdir/gitweb/$httpd_only";
 	open my \$access_log_fh, '>>', "\$logdir/access.log"
 		or die "Couldn't open access log '\$logdir/access.log': \$!";
 	open my \$error_log_fh,  '>>', "\$logdir/error.log"
 		or die "Couldn't open error log '\$logdir/error.log': \$!";

 	\$access_log_fh->autoflush(1);
 	\$error_log_fh->autoflush(1);

 	# redirect build time warnings to error.log
 	\$SIG{'__WARN__'} = sub {
 		my \$msg = shift;
 		# timestamp warning like in CGI::Carp::warn
 		my \$stamp = CGI::Carp::stamp();
 		\$msg =~ s/^/\$stamp/gm;
 		print \$error_log_fh \$msg;
 	};

 	# write errors to error.log, access to access.log
 	enable 'AccessLog',
 		format => "combined",
 		logger => sub { print \$access_log_fh @_; };
 	enable sub {
 		my \$app = shift;
 		sub {
 			my \$env = shift;
 			\$env->{'psgi.errors'} = \$error_log_fh;
 			\$app->(\$env);
 		}
 	};
 	# gitweb currently doesn't work with $SIG{CHLD} set to 'IGNORE',
 	# because it uses 'close $fd or die...' on piped filehandle $fh
 	# (which causes the parent process to wait for child to finish).
 	enable_if { \$SIG{'CHLD'} eq 'IGNORE' } sub {
 		my \$app = shift;
 		sub {
 			my \$env = shift;
 			local \$SIG{'CHLD'} = 'DEFAULT';
 			local \$SIG{'CLD'}  = 'DEFAULT';
 			\$app->(\$env);
 		}
 	};
 	# serve static files, i.e. stylesheet, images, script
 	enable 'Static',
 		path => sub { m!\.(js|css|png)\$! && s!^/gitweb/!! },
 		root => "$root/",
 		encoding => 'utf-8'; # encoding for 'text/plain' files
 	# convert CGI application to PSGI app
 	Plack::App::WrapCGI->new(script => "$root/gitweb.cgi")->to_app;
 };

 # make it runnable as standalone app,
 # like it would be run via 'plackup' utility
 if (caller) {
 	return \$app;
 } else {
 	require Plack::Runner;

 	my \$runner = Plack::Runner->new();
 	\$runner->parse_options(qw(--env deployment --port $port),
 				"$local" ? qw(--host 127.0.0.1) : ());
 	\$runner->run(\$app);
 }
 __END__
 EOF

 	chmod a+x "$fqgitdir/gitweb/gitweb.psgi"
 	# configuration is embedded in server script file, gitweb.psgi
 	rm -f "$conf"
 }

 gitweb_conf() {
 	cat > "$fqgitdir/gitweb/gitweb_config.perl" <<EOF
 #!@@PERL@@
 our \$projectroot = "$(dirname "$fqgitdir")";
 our \$git_temp = "$fqgitdir/gitweb/tmp";
 our \$projects_list = \$projectroot;

 \$feature{'remote_heads'}{'default'} = [1];
 EOF
 }

 configure_httpd() {
 	case "$httpd" in
 	*lighttpd*)
 		lighttpd_conf
 		;;
 	*apache2*|*httpd*)
 		apache2_conf
 		;;
 	webrick)
 		webrick_conf
 		;;
 	*mongoose*)
 		mongoose_conf
 		;;
 	*plackup*)
 		plackup_conf
 		;;
 	*)
 		echo "Unknown httpd specified: $httpd"
 		exit 1
 		;;
 	esac
 }

 case "$action" in
 stop)
 	stop_httpd
 	exit 0
 	;;
 start)
 	start_httpd
 	exit 0
 	;;
 restart)
 	stop_httpd
 	start_httpd
 	exit 0
 	;;
 esac

 gitweb_conf

 resolve_full_httpd
 mkdir -p "$fqgitdir/gitweb/$httpd_only"
 conf="$fqgitdir/gitweb/$httpd_only.conf"

 configure_httpd

 start_httpd
 url=http://127.0.0.1:$port

 if test -n "$browser"; then
 	httpd_is_ready && git web--browse -b "$browser" $url || echo $url
 else
 	httpd_is_ready && git web--browse -c "instaweb.browser" $url || echo $url
 fi
	#!/bin/sh
	#
	# Copyright (c) 2006 Eric Wong
	#

	PERL='@@PERL@@'
	OPTIONS_KEEPDASHDASH=
	OPTIONS_STUCKLONG=
	OPTIONS_SPEC="\
	git instaweb [options] (--start \| --stop \| --restart)
	--
	l,local only bind on 127.0.0.1
	p,port= the port to bind to
	d,httpd= the command to launch
	b,browser= the browser to launch
	m,module-path= the module path (only needed for apache2)
	Action
	stop stop the web server
	start start the web server
	restart restart the web server
	"

	. git-sh-setup

	fqgitdir="$GIT_DIR"
	local="$(git config --bool --get instaweb.local)"
	httpd="$(git config --get instaweb.httpd)"
	root="$(git config --get instaweb.gitwebdir)"
	port=$(git config --get instaweb.port)
	module_path="$(git config --get instaweb.modulepath)"
	action="browse"

	conf="$GIT_DIR/gitweb/httpd.conf"

	# Defaults:

	# if installed, it doesn't need further configuration (module_path)
	test -z "$httpd" && httpd='lighttpd -f'

	# Default is @@GITWEBDIR@@
	test -z "$root" && root='@@GITWEBDIR@@'

	# any untaken local port will do...
	test -z "$port" && port=1234

	resolve_full_httpd () {
	case "$httpd" in
	apache2\|lighttpd\|httpd)
	# yes, httpd covers lighttpd above, but it is there for clarity
	# ensure that the apache2/lighttpd command ends with "-f"
	if ! echo "$httpd" \| sane_grep -- '-f *$' >/dev/null 2>&1
	then
	httpd="$httpd -f"
	fi
	;;
	plackup)
	# server is started by running via generated gitweb.psgi in $fqgitdir/gitweb
	full_httpd="$fqgitdir/gitweb/gitweb.psgi"
	httpd_only="${httpd%% *}" # cut on first space
	return
	;;
	webrick)
	# server is started by running via generated webrick.rb in
	# $fqgitdir/gitweb
	full_httpd="$fqgitdir/gitweb/webrick.rb"
	httpd_only="${httpd%% *}" # cut on first space
	return
	;;
	esac

	httpd_only="$(echo $httpd \| cut -f1 -d' ')"
	if case "$httpd_only" in /) : ;; ) which $httpd_only >/dev/null 2>&1;; esac
	then
	full_httpd=$httpd
	else
	# many httpds are installed in /usr/sbin or /usr/local/sbin
	# these days and those are not in most users $PATHs
	# in addition, we may have generated a server script
	# in $fqgitdir/gitweb.
	for i in /usr/local/sbin /usr/sbin "$root" "$fqgitdir/gitweb"
	do
	if test -x "$i/$httpd_only"
	then
	full_httpd=$i/$httpd
	return
	fi
	done

	echo >&2 "$httpd_only not found. Install $httpd_only or use" \
	"--httpd to specify another httpd daemon."
	exit 1
	fi
	}

	start_httpd () {
	if test -f "$fqgitdir/pid"; then
	say "Instance already running. Restarting..."
	stop_httpd
	fi

	# here $httpd should have a meaningful value
	resolve_full_httpd
	mkdir -p "$fqgitdir/gitweb/$httpd_only"
	conf="$fqgitdir/gitweb/$httpd_only.conf"

	# generate correct config file if it doesn't exist
	test -f "$conf" \|\| configure_httpd
	test -f "$fqgitdir/gitweb/gitweb_config.perl" \|\| gitweb_conf

	# don't quote $full_httpd, there can be arguments to it (-f)
	case "$httpd" in
	mongoose\|plackup)
	#These servers don't have a daemon mode so we'll have to fork it
	$full_httpd "$conf" &
	#Save the pid before doing anything else (we'll print it later)
	pid=$!

	if test $? != 0; then
	echo "Could not execute http daemon $httpd."
	exit 1
	fi

	cat > "$fqgitdir/pid" <<EOF
	$pid
	EOF
	;;
	*)
	$full_httpd "$conf"
	if test $? != 0; then
	echo "Could not execute http daemon $httpd."
	exit 1
	fi
	;;
	esac
	}

	stop_httpd () {
	test -f "$fqgitdir/pid" && kill $(cat "$fqgitdir/pid")
	rm -f "$fqgitdir/pid"
	}

	httpd_is_ready () {
	"$PERL" -MIO::Socket::INET -e "
	local \$\| = 1; # turn on autoflush
	exit if (IO::Socket::INET->new('127.0.0.1:$port'));
	print 'Waiting for \'$httpd\' to start ..';
	do {
	print '.';
	sleep(1);
	} until (IO::Socket::INET->new('127.0.0.1:$port'));
	print qq! (done)\n!;
	"
	}

	while test $# != 0
	do
	case "$1" in
	--stop\|stop)
	action="stop"
	;;
	--start\|start)
	action="start"
	;;
	--restart\|restart)
	action="restart"
	;;
	-l\|--local)
	local=true
	;;
	-d\|--httpd)
	shift
	httpd="$1"
	;;
	-b\|--browser)
	shift
	browser="$1"
	;;
	-p\|--port)
	shift
	port="$1"
	;;
	-m\|--module-path)
	shift
	module_path="$1"
	;;
	--)
	;;
	*)
	usage
	;;
	esac
	shift
	done

	mkdir -p "$GIT_DIR/gitweb/tmp"
	GIT_EXEC_PATH="$(git --exec-path)"
	GIT_DIR="$fqgitdir"
	GITWEB_CONFIG="$fqgitdir/gitweb/gitweb_config.perl"
	export GIT_EXEC_PATH GIT_DIR GITWEB_CONFIG

	webrick_conf () {
	# webrick seems to have no way of passing arbitrary environment
	# variables to the underlying CGI executable, so we wrap the
	# actual gitweb.cgi using a shell script to force it
	wrapper="$fqgitdir/gitweb/$httpd/wrapper.sh"
	cat > "$wrapper" <<EOF
	#!/bin/sh
	# we use this shell script wrapper around the real gitweb.cgi since
	# there appears to be no other way to pass arbitrary environment variables
	# into the CGI process
	GIT_EXEC_PATH=$GIT_EXEC_PATH GIT_DIR=$GIT_DIR GITWEB_CONFIG=$GITWEB_CONFIG
	export GIT_EXEC_PATH GIT_DIR GITWEB_CONFIG
	exec $root/gitweb.cgi
	EOF
	chmod +x "$wrapper"

	# This assumes _ruby_ is in the user's $PATH. that's _one_
	# portable way to run ruby, which could be installed anywhere, really.
	# generate a standalone server script in $fqgitdir/gitweb.
	cat >"$fqgitdir/gitweb/$httpd.rb" <<EOF
	#!/usr/bin/env ruby
	require 'webrick'
	require 'logger'
	options = {
	:Port => $port,
	:DocumentRoot => "$root",
	:Logger => Logger.new('$fqgitdir/gitweb/error.log'),
	:AccessLog => [
	[ Logger.new('$fqgitdir/gitweb/access.log'),
	WEBrick::AccessLog::COMBINED_LOG_FORMAT ]
	],
	:DirectoryIndex => ["gitweb.cgi"],
	:CGIInterpreter => "$wrapper",
	:StartCallback => lambda do
	File.open("$fqgitdir/pid", "w") { \|f\| f.puts Process.pid }
	end,
	:ServerType => WEBrick::Daemon,
	}
	options[:BindAddress] = '127.0.0.1' if "$local" == "true"
	server = WEBrick::HTTPServer.new(options)
	['INT', 'TERM'].each do \|signal\|
	trap(signal) {server.shutdown}
	end
	server.start
	EOF
	chmod +x "$fqgitdir/gitweb/$httpd.rb"
	# configuration is embedded in server script file, webrick.rb
	rm -f "$conf"
	}

	lighttpd_conf () {
	cat > "$conf" <<EOF
	server.document-root = "$root"
	server.port = $port
	server.modules = ( "mod_setenv", "mod_cgi" )
	server.indexfiles = ( "gitweb.cgi" )
	server.pid-file = "$fqgitdir/pid"
	server.errorlog = "$fqgitdir/gitweb/$httpd_only/error.log"

	# to enable, add "mod_access", "mod_accesslog" to server.modules
	# variable above and uncomment this
	#accesslog.filename = "$fqgitdir/gitweb/$httpd_only/access.log"

	setenv.add-environment = ( "PATH" => env.PATH, "GITWEB_CONFIG" => env.GITWEB_CONFIG )

	cgi.assign = ( ".cgi" => "" )

	# mimetype mapping
	mimetype.assign = (
	".pdf" => "application/pdf",
	".sig" => "application/pgp-signature",
	".spl" => "application/futuresplash",
	".class" => "application/octet-stream",
	".ps" => "application/postscript",
	".torrent" => "application/x-bittorrent",
	".dvi" => "application/x-dvi",
	".gz" => "application/x-gzip",
	".pac" => "application/x-ns-proxy-autoconfig",
	".swf" => "application/x-shockwave-flash",
	".tar.gz" => "application/x-tgz",
	".tgz" => "application/x-tgz",
	".tar" => "application/x-tar",
	".zip" => "application/zip",
	".mp3" => "audio/mpeg",
	".m3u" => "audio/x-mpegurl",
	".wma" => "audio/x-ms-wma",
	".wax" => "audio/x-ms-wax",
	".ogg" => "application/ogg",
	".wav" => "audio/x-wav",
	".gif" => "image/gif",
	".jpg" => "image/jpeg",
	".jpeg" => "image/jpeg",
	".png" => "image/png",
	".xbm" => "image/x-xbitmap",
	".xpm" => "image/x-xpixmap",
	".xwd" => "image/x-xwindowdump",
	".css" => "text/css",
	".html" => "text/html",
	".htm" => "text/html",
	".js" => "text/javascript",
	".asc" => "text/plain",
	".c" => "text/plain",
	".cpp" => "text/plain",
	".log" => "text/plain",
	".conf" => "text/plain",
	".text" => "text/plain",
	".txt" => "text/plain",
	".dtd" => "text/xml",
	".xml" => "text/xml",
	".mpeg" => "video/mpeg",
	".mpg" => "video/mpeg",
	".mov" => "video/quicktime",
	".qt" => "video/quicktime",
	".avi" => "video/x-msvideo",
	".asf" => "video/x-ms-asf",
	".asx" => "video/x-ms-asf",
	".wmv" => "video/x-ms-wmv",
	".bz2" => "application/x-bzip",
	".tbz" => "application/x-bzip-compressed-tar",
	".tar.bz2" => "application/x-bzip-compressed-tar",
	"" => "text/plain"
	)
	EOF
	test x"$local" = xtrue && echo 'server.bind = "127.0.0.1"' >> "$conf"
	}

	apache2_conf () {
	if test -z "$module_path"
	then
	test -d "/usr/lib/httpd/modules" &&
	module_path="/usr/lib/httpd/modules"
	test -d "/usr/lib/apache2/modules" &&
	module_path="/usr/lib/apache2/modules"
	fi
	bind=
	test x"$local" = xtrue && bind='127.0.0.1:'
	echo 'text/css css' > "$fqgitdir/mime.types"
	cat > "$conf" <<EOF
	ServerName "git-instaweb"
	ServerRoot "$root"
	DocumentRoot "$root"
	ErrorLog "$fqgitdir/gitweb/$httpd_only/error.log"
	CustomLog "$fqgitdir/gitweb/$httpd_only/access.log" combined
	PidFile "$fqgitdir/pid"
	Listen $bind$port
	EOF

	for mod in mpm_event mpm_prefork mpm_worker
	do
	if test -e $module_path/mod_${mod}.so
	then
	echo "LoadModule ${mod}_module " \
	"$module_path/mod_${mod}.so" >> "$conf"
	# only one mpm module permitted
	break
	fi
	done
	for mod in mime dir env log_config authz_core
	do
	if test -e $module_path/mod_${mod}.so
	then
	echo "LoadModule ${mod}_module " \
	"$module_path/mod_${mod}.so" >> "$conf"
	fi
	done
	cat >> "$conf" <<EOF
	TypesConfig "$fqgitdir/mime.types"
	DirectoryIndex gitweb.cgi
	EOF

	# check to see if Dennis Stosberg's mod_perl compatibility patch
	# (<20060621130708.Gcbc6e5c@leonov.stosberg.net>) has been applied
	if test -f "$module_path/mod_perl.so" &&
	sane_grep 'MOD_PERL' "$root/gitweb.cgi" >/dev/null
	then
	# favor mod_perl if available
	cat >> "$conf" <<EOF
	LoadModule perl_module $module_path/mod_perl.so
	PerlPassEnv GIT_DIR
	PerlPassEnv GIT_EXEC_PATH
	PerlPassEnv GITWEB_CONFIG
	<Location /gitweb.cgi>
	SetHandler perl-script
	PerlResponseHandler ModPerl::Registry
	PerlOptions +ParseHeaders
	Options +ExecCGI
	</Location>
	EOF
	else
	# plain-old CGI
	resolve_full_httpd
	list_mods=$(echo "$full_httpd" \| sed 's/-f$/-l/')
	$list_mods \| sane_grep 'mod_cgi\.c' >/dev/null 2>&1 \|\| \
	if test -f "$module_path/mod_cgi.so"
	then
	echo "LoadModule cgi_module $module_path/mod_cgi.so" >> "$conf"
	else
	$list_mods \| grep 'mod_cgid\.c' >/dev/null 2>&1 \|\| \
	if test -f "$module_path/mod_cgid.so"
	then
	echo "LoadModule cgid_module $module_path/mod_cgid.so" \
	>> "$conf"
	else
	echo "You have no CGI support!"
	exit 2
	fi
	echo "ScriptSock logs/gitweb.sock" >> "$conf"
	fi
	cat >> "$conf" <<EOF
	PassEnv GIT_DIR
	PassEnv GIT_EXEC_PATH
	PassEnv GITWEB_CONFIG
	AddHandler cgi-script .cgi
	<Location /gitweb.cgi>
	Options +ExecCGI
	</Location>
	EOF
	fi
	}

	mongoose_conf() {
	cat > "$conf" <<EOF
	# Mongoose web server configuration file.
	# Lines starting with '#' and empty lines are ignored.
	# For detailed description of every option, visit
	# http://code.google.com/p/mongoose/wiki/MongooseManual

	root $root
	ports $port
	index_files gitweb.cgi
	#ssl_cert $fqgitdir/gitweb/ssl_cert.pem
	error_log $fqgitdir/gitweb/$httpd_only/error.log
	access_log $fqgitdir/gitweb/$httpd_only/access.log

	#cgi setup
	cgi_env PATH=$PATH,GIT_DIR=$GIT_DIR,GIT_EXEC_PATH=$GIT_EXEC_PATH,GITWEB_CONFIG=$GITWEB_CONFIG
	cgi_interp $PERL
	cgi_ext cgi,pl

	# mimetype mapping
	mime_types .gz=application/x-gzip,.tar.gz=application/x-tgz,.tgz=application/x-tgz,.tar=application/x-tar,.zip=application/zip,.gif=image/gif,.jpg=image/jpeg,.jpeg=image/jpeg,.png=image/png,.css=text/css,.html=text/html,.htm=text/html,.js=text/javascript,.c=text/plain,.cpp=text/plain,.log=text/plain,.conf=text/plain,.text=text/plain,.txt=text/plain,.dtd=text/xml,.bz2=application/x-bzip,.tbz=application/x-bzip-compressed-tar,.tar.bz2=application/x-bzip-compressed-tar
	EOF
	}

	plackup_conf () {
	# generate a standalone 'plackup' server script in $fqgitdir/gitweb
	# with embedded configuration; it does not use "$conf" file
	cat > "$fqgitdir/gitweb/gitweb.psgi" <<EOF
	#!$PERL

	# gitweb - simple web interface to track changes in git repositories
	# PSGI wrapper and server starter (see http://plackperl.org)

	use strict;

	use IO::Handle;
	use Plack::MIME;
	use Plack::Builder;
	use Plack::App::WrapCGI;
	use CGI::Emulate::PSGI 0.07; # minimum version required to work with gitweb

	# mimetype mapping (from lighttpd_conf)
	Plack::MIME->add_type(
	".pdf" => "application/pdf",
	".sig" => "application/pgp-signature",
	".spl" => "application/futuresplash",
	".class" => "application/octet-stream",
	".ps" => "application/postscript",
	".torrent" => "application/x-bittorrent",
	".dvi" => "application/x-dvi",
	".gz" => "application/x-gzip",
	".pac" => "application/x-ns-proxy-autoconfig",
	".swf" => "application/x-shockwave-flash",
	".tar.gz" => "application/x-tgz",
	".tgz" => "application/x-tgz",
	".tar" => "application/x-tar",
	".zip" => "application/zip",
	".mp3" => "audio/mpeg",
	".m3u" => "audio/x-mpegurl",
	".wma" => "audio/x-ms-wma",
	".wax" => "audio/x-ms-wax",
	".ogg" => "application/ogg",
	".wav" => "audio/x-wav",
	".gif" => "image/gif",
	".jpg" => "image/jpeg",
	".jpeg" => "image/jpeg",
	".png" => "image/png",
	".xbm" => "image/x-xbitmap",
	".xpm" => "image/x-xpixmap",
	".xwd" => "image/x-xwindowdump",
	".css" => "text/css",
	".html" => "text/html",
	".htm" => "text/html",
	".js" => "text/javascript",
	".asc" => "text/plain",
	".c" => "text/plain",
	".cpp" => "text/plain",
	".log" => "text/plain",
	".conf" => "text/plain",
	".text" => "text/plain",
	".txt" => "text/plain",
	".dtd" => "text/xml",
	".xml" => "text/xml",
	".mpeg" => "video/mpeg",
	".mpg" => "video/mpeg",
	".mov" => "video/quicktime",
	".qt" => "video/quicktime",
	".avi" => "video/x-msvideo",
	".asf" => "video/x-ms-asf",
	".asx" => "video/x-ms-asf",
	".wmv" => "video/x-ms-wmv",
	".bz2" => "application/x-bzip",
	".tbz" => "application/x-bzip-compressed-tar",
	".tar.bz2" => "application/x-bzip-compressed-tar",
	"" => "text/plain"
	);

	my \$app = builder {
	# to be able to override \$SIG{__WARN__} to log build time warnings
	use CGI::Carp; # it sets \$SIG{__WARN__} itself

	my \$logdir = "$fqgitdir/gitweb/$httpd_only";
	open my \$access_log_fh, '>>', "\$logdir/access.log"
	or die "Couldn't open access log '\$logdir/access.log': \$!";
	open my \$error_log_fh, '>>', "\$logdir/error.log"
	or die "Couldn't open error log '\$logdir/error.log': \$!";

	\$access_log_fh->autoflush(1);
	\$error_log_fh->autoflush(1);

	# redirect build time warnings to error.log
	\$SIG{'__WARN__'} = sub {
	my \$msg = shift;
	# timestamp warning like in CGI::Carp::warn
	my \$stamp = CGI::Carp::stamp();
	\$msg =~ s/^/\$stamp/gm;
	print \$error_log_fh \$msg;
	};

	# write errors to error.log, access to access.log
	enable 'AccessLog',
	format => "combined",
	logger => sub { print \$access_log_fh @_; };
	enable sub {
	my \$app = shift;
	sub {
	my \$env = shift;
	\$env->{'psgi.errors'} = \$error_log_fh;
	\$app->(\$env);
	}
	};
	# gitweb currently doesn't work with $SIG{CHLD} set to 'IGNORE',
	# because it uses 'close $fd or die...' on piped filehandle $fh
	# (which causes the parent process to wait for child to finish).
	enable_if { \$SIG{'CHLD'} eq 'IGNORE' } sub {
	my \$app = shift;
	sub {
	my \$env = shift;
	local \$SIG{'CHLD'} = 'DEFAULT';
	local \$SIG{'CLD'} = 'DEFAULT';
	\$app->(\$env);
	}
	};
	# serve static files, i.e. stylesheet, images, script
	enable 'Static',
	path => sub { m!\.(js\|css\|png)\$! && s!^/gitweb/!! },
	root => "$root/",
	encoding => 'utf-8'; # encoding for 'text/plain' files
	# convert CGI application to PSGI app
	Plack::App::WrapCGI->new(script => "$root/gitweb.cgi")->to_app;
	};

	# make it runnable as standalone app,
	# like it would be run via 'plackup' utility
	if (caller) {
	return \$app;
	} else {
	require Plack::Runner;

	my \$runner = Plack::Runner->new();
	\$runner->parse_options(qw(--env deployment --port $port),
	"$local" ? qw(--host 127.0.0.1) : ());
	\$runner->run(\$app);
	}
	__END__
	EOF

	chmod a+x "$fqgitdir/gitweb/gitweb.psgi"
	# configuration is embedded in server script file, gitweb.psgi
	rm -f "$conf"
	}

	gitweb_conf() {
	cat > "$fqgitdir/gitweb/gitweb_config.perl" <<EOF
	#!@@PERL@@
	our \$projectroot = "$(dirname "$fqgitdir")";
	our \$git_temp = "$fqgitdir/gitweb/tmp";
	our \$projects_list = \$projectroot;

	\$feature{'remote_heads'}{'default'} = [1];
	EOF
	}

	configure_httpd() {
	case "$httpd" in
	lighttpd)
	lighttpd_conf
	;;
	apache2\|httpd)
	apache2_conf
	;;
	webrick)
	webrick_conf
	;;
	mongoose)
	mongoose_conf
	;;
	plackup)
	plackup_conf
	;;
	*)
	echo "Unknown httpd specified: $httpd"
	exit 1
	;;
	esac
	}

	case "$action" in
	stop)
	stop_httpd
	exit 0
	;;
	start)
	start_httpd
	exit 0
	;;
	restart)
	stop_httpd
	start_httpd
	exit 0
	;;
	esac

	gitweb_conf

	resolve_full_httpd
	mkdir -p "$fqgitdir/gitweb/$httpd_only"
	conf="$fqgitdir/gitweb/$httpd_only.conf"

	configure_httpd

	start_httpd
	url=http://127.0.0.1:$port

	if test -n "$browser"; then
	httpd_is_ready && git web--browse -b "$browser" $url \|\| echo $url
	else
	httpd_is_ready && git web--browse -c "instaweb.browser" $url \|\| echo $url
	fi