misc/windows: automated toolchain packager

A first run at fully automating the process.
This CL supersedes https://golang.org/cl/4634114/
which I seemed to have lost.

R=golang-dev, alex.brainman, adg
CC=golang-dev
https://golang.org/cl/5273041

misc/windows/README

+package.bash packages the Go toolchain for Window's in 
+zip and installer (exe) format. 
+
+Dependencies
+============
+- Inno Setup: http://www.jrsoftware.org/isinfo.php
+- 7Zip command-line: http://www.7-zip.org/download.html
+- MinGW/Msys tools
+
+Unzip and place 7za.exe in msys' bin directory.
+
+Packaging
+=========
+1) have a go tree at $GOROOT
+2) make sure $GOBIN=$GOROOT\bin is empty
+3) select appropriate version "hg up -r ..."
+4) build go "cd $GOROOT/src; ./all.bash"
+5) create Windows packages "cd $GOROOT/misc/windows; ./package.bash"
+
+
+
+

misc/windows/installer.iss

+;; Copyright 2010 The Go Authors.  All rights reserved.
+;; Use of this source code is governed by a BSD-style
+;; license that can be found in the LICENSE file.
+
+[Setup]
+;; (To generate a new GUID, click Tools | Generate GUID inside the IDE.)
+AppId={{1AE268D9-FAE4-4EF8-AAE9-3B1B27D604F0}
+AppName={#AppName}
+AppVersion={#AppVersion}
+AppPublisher=golang-nuts@googlegroups.com
+AppPublisherURL=http://www.golang.org
+DefaultDirName={sd}\Go
+DisableDirPage=yes
+DefaultGroupName={#AppName}
+AllowNoIcons=yes
+OutputBaseFilename={#AppNameLower}win{#AppVersion}_installer
+Compression=lzma2/max
+SolidCompression=yes
+ChangesEnvironment=true
+OutputDir=.
+
+[Languages]
+Name: "english"; MessagesFile: "compiler:Default.isl"
+Name: "basque"; MessagesFile: "compiler:Languages\Basque.isl"
+Name: "brazilianportuguese"; MessagesFile: "compiler:Languages\BrazilianPortuguese.isl"
+Name: "catalan"; MessagesFile: "compiler:Languages\Catalan.isl"
+Name: "czech"; MessagesFile: "compiler:Languages\Czech.isl"
+Name: "danish"; MessagesFile: "compiler:Languages\Danish.isl"
+Name: "dutch"; MessagesFile: "compiler:Languages\Dutch.isl"
+Name: "finnish"; MessagesFile: "compiler:Languages\Finnish.isl"
+Name: "french"; MessagesFile: "compiler:Languages\French.isl"
+Name: "german"; MessagesFile: "compiler:Languages\German.isl"
+Name: "hebrew"; MessagesFile: "compiler:Languages\Hebrew.isl"
+Name: "hungarian"; MessagesFile: "compiler:Languages\Hungarian.isl"
+Name: "italian"; MessagesFile: "compiler:Languages\Italian.isl"
+Name: "japanese"; MessagesFile: "compiler:Languages\Japanese.isl"
+Name: "norwegian"; MessagesFile: "compiler:Languages\Norwegian.isl"
+Name: "polish"; MessagesFile: "compiler:Languages\Polish.isl"
+Name: "portuguese"; MessagesFile: "compiler:Languages\Portuguese.isl"
+Name: "russian"; MessagesFile: "compiler:Languages\Russian.isl"
+Name: "slovak"; MessagesFile: "compiler:Languages\Slovak.isl"
+Name: "slovenian"; MessagesFile: "compiler:Languages\Slovenian.isl"
+Name: "spanish"; MessagesFile: "compiler:Languages\Spanish.isl"
+
+[Files]
+Source: ".\go\*"; DestDir: "{sd}\Go"; Flags: ignoreversion recursesubdirs createallsubdirs
+
+[Registry]
+;Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"; ValueType: string; ValueName: "GOARCH"; ValueData: "386"; Flags: uninsdeletevalue
+;Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"; ValueType: string; ValueName: "GOOS"; ValueData: "windows"; Flags: uninsdeletevalue
+Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"; ValueType: string; ValueName: "GOBIN"; ValueData: "{sd}/Go/bin"; Flags: uninsdeletevalue
+Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"; ValueType: string; ValueName: "GOROOT"; ValueData: "{sd}/Go"; Flags: uninsdeletevalue
+Root: HKLM; Subkey: "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"; ValueType: expandsz; ValueName: "Path";  ValueData: "{olddata};{sd}/Go/bin"; Check: PathCheck('{sd}/Go/bin')
+
+;[Tasks]
+;Name: AddToPath; Description: "&Adding Go's bin directory to your environment's search path. This allows the tools to be run from a shell without having to include the installation path as part of the command.";
+
+[Icons]
+;Name: "{group}\{cm:UninstallProgram,Go}"; Filename: {uninstallexe}
+Name: "{group}\Uninstall Go"; Filename: "{uninstallexe}"
+
+[Code]
+function PathCheck(Param: string): Boolean;
+var
+    OrigPath: String;
+    Index: Integer;
+begin
+    // check for an empty path
+    if not RegQueryStringValue(HKEY_LOCAL_MACHINE, 'SYSTEM\CurrentControlSet\Control\Session Manager\Environment', 'Path', OrigPath)
+    then begin
+        Result := True;
+        exit;
+    end;
+
+    // Pos returns 0 if not found
+    Index := Pos(';' + Param + ';', ';' + OrigPath + ';');
+
+    if (IsUninstaller() = True) AND (Index > 0) then begin
+        Delete(OrigPath, Index, Length(Param));
+
+        // remove orphaned semicolon if necessary
+        if (Length(OrigPath) >= Index) AND (Copy(OrigPath, Index, 1) = ';') then begin
+            Delete(OrigPath, Index, 1);
+        end;
+
+        RegWriteStringValue(HKEY_LOCAL_MACHINE, 'SYSTEM\CurrentControlSet\Control\Session Manager\Environment', 'Path', OrigPath);
+    end;
+
+    // during installation, the check in the Registry
+    // section wants a Boolean value
+    Result := Index = 0;
+end;
+
+function InitializeUninstall(): Boolean;
+begin
+    PathCheck(ExpandConstant('{sd}/Go/bin'));
+    Result := True;
+end;

misc/windows/package.bash

+#!/usr/bin/env bash
+# Copyright 2010 The Go Authors.  All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+set -e
+
+ISCC="C:/Program Files/Inno Setup 5/ISCC.exe"
+
+echo "%%%%% Checking for Inno Setup %%%%%" 1>&2
+if ! test -f "$ISCC"; then
+	ISCC="C:/Program Files (x86)/Inno Setup 5/ISCC.exe"
+	if ! test -f "$ISCC"; then
+		echo "No Inno Setup installation found" 1>&2
+		exit 1
+	fi
+fi
+
+echo "%%%%% Checking the packager's path %%%%%" 1>&2
+if ! test -f ../../src/env.bash; then
+	echo "package.bash must be run from $GOROOT/misc/windows" 1>&2
+fi
+
+echo "%%%%% Setting the go package version info %%%%%" 1>&2
+ver="$(bash ../../src/version.bash | sed 's/ .*//')"
+
+rm -rf go
+mkdir go
+
+echo "%%%%% Cloning the go tree %%%%%" 1>&2
+hg clone -r $(hg id -n | sed 's/+//') $(hg root) go
+
+rm -rf ./go/.hg ./go/.hgignore ./go/.hgtags
+
+echo "%%%%% Copying pkg and bin %%%%%" 1>&2
+cp -a ../../pkg go/pkg
+cp -a ../../bin go/bin
+
+echo "%%%%% Starting zip packaging %%%%%" 1>&2
+7za a -tzip -mx=9 gowin386"_"$ver.zip "go/" >/dev/null
+
+echo "%%%%% Starting installer packaging %%%%%" 1>&2
+"$ISCC" //dAppName=Go //dAppVersion=386"_"$ver //dAppNameLower=go installer.iss  >/dev/null
+
+