Add git-instaweb, instantly browse the working repo with gitweb

I got tired of having to configure gitweb for every repository
I work on.  I sometimes prefer gitweb to standard GUIs like gitk
or gitview; so this lets me automatically configure gitweb to
browse my working repository and also opens my browser to it.

Updates from the original patch:

Added Apache/mod_perl2 compatibility if Dennis Stosberg's gitweb
has been applied, too: <20060621130708.Gcbc6e5c@leonov.stosberg.net>

General cleanups in shell code usage.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

4 files changed, 335 insertions, 1 deletions

diff --git a/.gitignore b/.gitignore
index 7b954d587..2bcc604af 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,6 +46,7 @@ git-http-push
 git-imap-send
 git-index-pack
 git-init-db
+git-instaweb
 git-local-fetch
 git-log
 git-lost-found
diff --git a/Documentation/git-instaweb.txt b/Documentation/git-instaweb.txt
new file mode 100644
index 000000000..7dd393b97
--- /dev/null
+++ b/Documentation/git-instaweb.txt
@@ -0,0 +1,84 @@
+git-instaweb(1)
+===============
+
+NAME
+----
+git-instaweb - instantly browse your working repository in gitweb
+
+SYNOPSIS
+--------
+'git-instaweb' [--local] [--httpd=<httpd>] [--port=<port>] [--browser=<browser>]
+
+'git-instaweb' [--start] [--stop] [--restart]
+
+DESCRIPTION
+-----------
+A simple script to setup gitweb and a web server for browsing the local
+repository.
+
+OPTIONS
+-------
+
+-l|--local::
+	Only bind the web server to the local IP (127.0.0.1).
+
+-d|--httpd::
+	The HTTP daemon command-line that will be executed.
+	Command-line options may be specified here, and the
+	configuration file will be added at the end of the command-line.
+	Currently, lighttpd and apache2 are the only supported servers.
+	(Default: lighttpd)
+
+-m|--module-path::
+	The module path (only needed if httpd is Apache).
+	(Default: /usr/lib/apache2/modules)
+
+-p|--port::
+	The port number to bind the httpd to.  (Default: 1234)
+
+-b|--browser::
+
+	The web browser command-line to execute to view the gitweb page.
+	If blank, the URL of the gitweb instance will be printed to
+	stdout.  (Default: 'firefox')
+
+--start::
+	Start the httpd instance and exit.  This does not generate
+	any of the configuration files for spawning a new instance.
+
+--stop::
+	Stop the httpd instance and exit.  This does not generate
+	any of the configuration files for spawning a new instance,
+	nor does it close the browser.
+
+--restart::
+	Restart the httpd instance and exit.  This does not generate
+	any of the configuration files for spawning a new instance.
+
+CONFIGURATION
+-------------
+
+You may specify configuration in your .git/config
+
+-----------------------------------------------------------------------
+[instaweb]
+	local = true
+	httpd = apache2 -f
+	port = 4321
+	browser = konqueror
+	modulepath = /usr/lib/apache2/modules
+
+-----------------------------------------------------------------------
+
+Author
+------
+Written by Eric Wong <normalperson@yhbt.net>
+
+Documentation
+--------------
+Documentation by Eric Wong <normalperson@yhbt.net>.
+
+GIT
+---
+Part of the gitlink:git[7] suite
+
diff --git a/Makefile b/Makefile
index cde619c49..83d892229 100644
--- a/Makefile
+++ b/Makefile
@@ -142,7 +142,7 @@ SCRIPT_PYTHON = \
 SCRIPTS = $(patsubst %.sh,%,$(SCRIPT_SH)) \
 	  $(patsubst %.perl,%,$(SCRIPT_PERL)) \
 	  $(patsubst %.py,%,$(SCRIPT_PYTHON)) \
-	  git-cherry-pick git-status
+	  git-cherry-pick git-status git-instaweb
 
 # The ones that do not have to link with lcrypto, lz nor xdiff.
 SIMPLE_PROGRAMS = \
@@ -545,6 +545,20 @@ git-status: git-commit
 	cp $< $@+
 	mv $@+ $@
 
+git-instaweb: git-instaweb.sh gitweb/gitweb.cgi gitweb/gitweb.css
+	rm -f $@ $@+
+	sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \
+	    -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
+	    -e 's/@@NO_CURL@@/$(NO_CURL)/g' \
+	    -e 's/@@NO_PYTHON@@/$(NO_PYTHON)/g' \
+	    $@.sh | sed \
+	    -e 's|@@GITWEB_CGI@@|#!$(PERL_PATH_SQ)|; T; r gitweb/gitweb.cgi' \
+	    | sed \
+	    -e 's|@@GITWEB_CSS@@||; T; r gitweb/gitweb.css' \
+	    > $@+
+	chmod +x $@+
+	mv $@+ $@
+
 # These can record GIT_VERSION
 git$X git.spec \
 	$(patsubst %.sh,%,$(SCRIPT_SH)) \
diff --git a/git-instaweb.sh b/git-instaweb.sh
new file mode 100755
index 000000000..51067d967
--- /dev/null
+++ b/git-instaweb.sh
@@ -0,0 +1,235 @@
+#!/bin/sh
+#
+# Copyright (c) 2006 Eric Wong
+#
+USAGE='[--start] [--stop] [--restart]
+  [--local] [--httpd=<httpd>] [--port=<port>] [--browser=<browser>]
+  [--module-path=<path> (for Apache2 only)]'
+
+. git-sh-setup
+
+case "$GIT_DIR" in
+/*)
+	fqgitdir="$GIT_DIR" ;;
+*)
+	fqgitdir="$PWD/$GIT_DIR" ;;
+esac
+
+local="`git repo-config --bool --get instaweb.local`"
+httpd="`git repo-config --get instaweb.httpd`"
+browser="`git repo-config --get instaweb.browser`"
+port=`git repo-config --get instaweb.port`
+module_path="`git repo-config --get instaweb.modulepath`"
+
+conf=$GIT_DIR/gitweb/httpd.conf
+
+# Defaults:
+
+# if installed, it doens't need further configuration (module_path)
+test -z "$httpd" && httpd='lighttpd -f'
+
+# probably the most popular browser among gitweb users
+test -z "$browser" && browser='firefox'
+
+# any untaken local port will do...
+test -z "$port" && port=1234
+
+start_httpd () {
+	httpd_only="`echo $httpd | cut -f1 -d' '`"
+	if test "`expr index $httpd_only /`" -eq '1' || \
+				which $httpd_only >/dev/null
+	then
+		$httpd $fqgitdir/gitweb/httpd.conf
+	else
+		# many httpds are installed in /usr/sbin or /usr/local/sbin
+		# these days and those are not in most users $PATHs
+		for i in /usr/local/sbin /usr/sbin
+		do
+			if test -x "$i/$httpd_only"
+			then
+				# don't quote $httpd, there can be
+				# arguments to it (-f)
+				$i/$httpd "$fqgitdir/gitweb/httpd.conf"
+				return
+			fi
+		done
+	fi
+}
+
+stop_httpd () {
+	test -f "$fqgitdir/pid" && kill `cat "$fqgitdir/pid"`
+}
+
+while case "$#" in 0) break ;; esac
+do
+	case "$1" in
+	--stop|stop)
+		stop_httpd
+		exit 0
+		;;
+	--start|start)
+		start_httpd
+		exit 0
+		;;
+	--restart|restart)
+		stop_httpd
+		start_httpd
+		exit 0
+		;;
+	--local|-l)
+		local=true
+		;;
+	-d|--httpd|--httpd=*)
+		case "$#,$1" in
+		*,*=*)
+			httpd=`expr "$1" : '-[^=]*=\(.*\)'` ;;
+		1,*)
+			usage ;;
+		*)
+			httpd="$2"
+			shift ;;
+		esac
+		;;
+	-b|--browser|--browser=*)
+		case "$#,$1" in
+		*,*=*)
+			browser=`expr "$1" : '-[^=]*=\(.*\)'` ;;
+		1,*)
+			usage ;;
+		*)
+			browser="$2"
+			shift ;;
+		esac
+		;;
+	-p|--port|--port=*)
+		case "$#,$1" in
+		*,*=*)
+			port=`expr "$1" : '-[^=]*=\(.*\)'` ;;
+		1,*)
+			usage ;;
+		*)
+			port="$2"
+			shift ;;
+		esac
+		;;
+	-m|--module-path=*|--module-path)
+		case "$#,$1" in
+		*,*=*)
+			module_path=`expr "$1" : '-[^=]*=\(.*\)'` ;;
+		1,*)
+			usage ;;
+		*)
+			module_path="$2"
+			shift ;;
+		esac
+		;;
+	*)
+		usage
+		;;
+	esac
+	shift
+done
+
+mkdir -p "$GIT_DIR/gitweb/tmp"
+GIT_EXEC_PATH="`git --exec-path`"
+GIT_DIR="$fqgitdir"
+export GIT_EXEC_PATH GIT_DIR
+
+
+lighttpd_conf () {
+	cat > "$conf" <<EOF
+server.document-root = "$fqgitdir/gitweb"
+server.port = $port
+server.modules = ( "mod_cgi" )
+server.indexfiles = ( "gitweb.cgi" )
+server.pid-file = "$fqgitdir/pid"
+cgi.assign = ( ".cgi" => "" )
+mimetype.assign = ( ".css" => "text/css" )
+EOF
+	test "$local" = true && echo 'server.bind = "127.0.0.1"' >> "$conf"
+}
+
+apache2_conf () {
+	test -z "$module_path" && module_path=/usr/lib/apache2/modules
+	mkdir -p "$GIT_DIR/gitweb/logs"
+	bind=
+	test "$local" = true && bind='127.0.0.1:'
+	echo 'text/css css' > $fqgitdir/mime.types
+	cat > "$conf" <<EOF
+ServerRoot "$fqgitdir/gitweb"
+DocumentRoot "$fqgitdir/gitweb"
+PidFile "$fqgitdir/pid"
+Listen $bind$port
+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" && grep '^our $gitbin' \
+				"$GIT_DIR/gitweb/gitweb.cgi" >/dev/null
+	then
+		# favor mod_perl if available
+		cat >> "$conf" <<EOF
+LoadModule perl_module $module_path/mod_perl.so
+PerlPassEnv GIT_DIR
+PerlPassEnv GIT_EXEC_DIR
+<Location /gitweb.cgi>
+	SetHandler perl-script
+	PerlResponseHandler ModPerl::Registry
+	PerlOptions +ParseHeaders
+	Options +ExecCGI
+</Location>
+EOF
+	else
+		# plain-old CGI
+		cat >> "$conf" <<EOF
+LoadModule cgi_module $module_path/mod_cgi.so
+AddHandler cgi-script .cgi
+<Location /gitweb.cgi>
+	Options +ExecCGI
+</Location>
+EOF
+	fi
+}
+
+script='
+s#^\(my\|our\) $projectroot =.*#\1 $projectroot = "'`dirname $fqgitdir`'";#;
+s#\(my\|our\) $gitbin =.*#\1 $gitbin = "'$GIT_EXEC_PATH'";#;
+s#\(my\|our\) $projects_list =.*#\1 $projects_list = $projectroot;#;
+s#\(my\|our\) $git_temp =.*#\1 $git_temp = "'$fqgitdir/gitweb/tmp'";#'
+
+gitweb_cgi () {
+	cat > "$1.tmp" <<\EOFGITWEB
+@@GITWEB_CGI@@
+EOFGITWEB
+	sed "$script" "$1.tmp"  > "$1"
+	chmod +x "$1"
+	rm -f "$1.tmp"
+}
+
+gitweb_css () {
+	cat > "$1" <<\EOFGITWEB
+@@GITWEB_CSS@@
+EOFGITWEB
+}
+
+gitweb_cgi $GIT_DIR/gitweb/gitweb.cgi
+gitweb_css $GIT_DIR/gitweb/gitweb.css
+
+case "$httpd" in
+*lighttpd*)
+	lighttpd_conf
+	;;
+*apache2*)
+	apache2_conf
+	;;
+*)
+	echo "Unknown httpd specified: $httpd"
+	exit 1
+	;;
+esac
+
+start_httpd
+test -z "$browser" && browser=echo
+$browser http://127.0.0.1:$port