UPDATE_CYGWIN.cmd

@echo off
rem Leave empty for defaults/autodetect, or set BOTH variables (C:\cygwin64;x86_64)
set MY_CYGWIN_PATH=
set MY_CYGWIN_ARCH=
rem GnuPG is needed for setup file signature check. Download ftp://ftp.gnupg.org/gcrypt/binary/gnupg-w32cli-1.4.19.exe and ftp://ftp.gnupg.org/gcrypt/binary/libiconv-1.9.1.dll.zip. Actually only needed files are gpg.exe and iconv.dll.
set GNUPG=C:\Program Files (x86)\GNU\GnuPG\gpg.exe
goto :BEGIN

REM Last change:
rem 2015-11-19: tested on Windows Server 2008 R2
rem 2015-11-19: iconv.dll link, typos, tested on Windows Server 2012 R2
rem 2015-11-18: tested on Windows 7 64-bit
rem 2015-11-18: completely rewritten

REM Author: Vladimir Bella

REM DISCLAIMER
rem I wrote this software for myself, to satisfy my needs and requirements.
rem You can freely use (and modify) it, but this is YOUR decision and YOU are responsible if this
rem software fits to you.

:IS_ADMIN_ELEVATED
    rem Thanks to Ben Hooper, http://stackoverflow.com/questions/4051883/batch-script-how-to-check-for-admin-rights
    set RV=0
    net session >nul 2>&1
    if not errorlevel 1 set RV=1
goto :EOF

:DOWNLOAD
    if not "%WGET%"=="" "%WGET%" %1 -O %2
    if     "%WGET%"=="" "%CURL%" %1 -o %2
    if errorlevel 1 if exist %2 del %2
goto :EOF

:FIND_IN_PATH
    set RV=%~$PATH:1
goto :EOF

:ERR_PERMISSIONS
    @echo Please run this script with administrative/elevated permissions.
    @pause
goto :EOF

:ERR_CYGWIN_NOT_FOUND
    @echo Cygwin installation not found.
    @pause
goto :EOF

:ERR_MISSING_WGET
    @echo Neither wget nor curl found in Cygwin.
    @pause
goto :EOF

:ERR_NO_SETUP
    @echo %SETUP%.exe not found in script directory (%~dp0).
    @pause
goto :EOF

:ERR_NO_PUBRING
    @echo Missing/can't be downloaded pubring.asc.
    @pause
goto :EOF

:ERR_NO_SIGNATURE
    @echo Missing/can't be downloaded fresh setup signature.
    @pause
goto :EOF

:ERR_NO_GPG
    @echo Gpg.exe can't be found.
    @pause
goto :EOF

:ERR_GPG_IMPORT
    @echo Gpg: import of Cygwin key failed.
    @pause
goto :EOF

:ERR_SETUP_DNL_FAILED
    @echo Downloading new setup failed.
    @pause
goto :EOF

:ERR_NEW_SETUP_SIG
    @echo ERROR. New setup (%SETUP%.exe) signature verification FAILED.
    @pause
goto :EOF


:BEGIN
setlocal enableextensions enabledelayedexpansion

@REM ==================================================
@REM Check and set environment
@REM ==================================================

@echo Checking for administrative/elevated permissions...
call :IS_ADMIN_ELEVATED
if %RV%==0 goto :ERR_PERMISSIONS
@echo Ok.
@echo.

@echo Searching for Cygwin installation to upgrade...
if not "%MY_CYGWIN_PATH%"=="" if not "%MY_CYGWIN_ARCH%"=="" goto :VERIFY_MY_CYGWIN
set MY_CYGWIN_PATH=C:\cygwin64
set MY_CYGWIN_ARCH=x86_64
if not exist "%MY_CYGWIN_PATH%\bin\cygwin*.dll" (
    set MY_CYGWIN_PATH=C:\cygwin
    set MY_CYGWIN_ARCH=x86
)
@set WGET=%MY_CYGWIN_PATH%\bin\wget.exe
@set CURL=%MY_CYGWIN_PATH%\bin\curl.exe
@set SETUP=setup-%MY_CYGWIN_ARCH%
:VERIFY_MY_CYGWIN
if not exist "%MY_CYGWIN_PATH%\bin\cygwin*.dll" goto :ERR_CYGWIN_NOT_FOUND
if not exist "%WGET%" if not exist "%CURL%" goto :ERR_MISSING_WGET
@echo Ok.
@echo.

@REM Next is needed, because UAC changes current directory
cd /d "%~dp0"

@echo Checking for GnuPG...
if not exist "%GNUPG%" (
    call :FIND_IN_PATH gpg.exe
    set GNUPG=%RV%
)
if not exist "%GNUPG%" set GNUPG=gpg.exe
if not exist "%GNUPG%" goto :ERR_NO_GPG
@echo Ok.
@echo.

@REM ==================================================
@REM Ensure current and correct setup program
@REM ==================================================

@echo Checking for setup in current directory...
if not exist %SETUP%.exe goto :ERR_NO_SETUP
@echo Ok.
@echo.

@echo Downloading public key and current setup signature...
if not exist cygwin-pubring.asc call :DOWNLOAD https://cygwin.com/key/pubring.asc cygwin-pubring.asc
call :DOWNLOAD https://cygwin.com/%SETUP%.exe.sig %SETUP%.exe.sig
if not exist cygwin-pubring.asc goto :ERR_NO_PUBRING
if not exist %SETUP%.exe.sig goto :ERR_NO_SIGNATURE
@echo Ok.
@echo.

@echo Ensure Cygwin key is in keyring...
"%GNUPG%" --list-keys Cygwin >nul:
if errorlevel 1 "%GNUPG%" --import cygwin-pubring.asc
if errorlevel 1 goto :ERR_GPG_IMPORT
@echo Ok.
@echo.

@echo Check, if we have current setup...
"%GNUPG%" --verify %SETUP%.exe.sig %SETUP%.exe
if not errorlevel 1 (
    @echo Yes, we have.
    @echo.
    goto :HAVE_SETUP
)
@echo Nope. Need new setup...
set EXT=
@for /L %%i in (1,1,999) do (
    set E=00%%i
    set E=!E:~-3!
    if !EXT!_==_ if not exist %SETUP%.exe.!E! set EXT=!E!
)
rename %SETUP%.exe %SETUP%.exe.%EXT%
call :DOWNLOAD https://cygwin.com/%SETUP%.exe %SETUP%.exe
if not exist %SETUP%.exe (
    rem revert last rename
    rename %SETUP%.exe.%EXT% %SETUP%.exe
    goto :ERR_SETUP_DNL_FAILED
)
@echo New setup downloaded.
@echo Old setup saved as %SETUP%.exe.%EXT%.
@echo.
@echo Check new setup signature...
"%GNUPG%" --verify %SETUP%.exe.sig %SETUP%.exe
if errorlevel 1 goto :ERR_NEW_SETUP_SIG
@echo Ok.
@echo.

:HAVE_SETUP

@REM ==================================================
@REM Stop running services
@REM ==================================================

set HAVE_HTTPD=0
set HAVE_MYSQLD=0
set HAVE_SSHD=0
set HAVE_CYGSERVER=0
@REM ==================================================
@echo Service: httpd
    tasklist | find "httpd.exe" >nul
    if not errorlevel 1 set HAVE_HTTPD=1
    set OLD_PATH=%PATH%
    set PATH=C:\cygwin\bin;C:\cygwin\usr\local\bin;%PATH%
    if %HAVE_HTTPD%==1 @echo ... stopping
    if %HAVE_HTTPD%==1 "%MY_CYGWIN_PATH%\bin\bash" /usr/sbin/apachectl -k stop
    if %HAVE_HTTPD%==0 @echo ... did not run
    set PATH=%OLD_PATH%
@echo Service: mysqld
    sc query mysqld | find "RUNNING" >nul
    if not errorlevel 1 set HAVE_MYSQLD=1
    if %HAVE_MYSQLD%==1 @echo ... stopping
    if %HAVE_MYSQLD%==1 net stop mysqld
    if %HAVE_MYSQLD%==0 @echo ... did not run
@echo Service: sshd
    sc query sshd | find "RUNNING" >nul
    if not errorlevel 1 set HAVE_SSHD=1
    if %HAVE_SSHD%==1 @echo ... stopping
    if %HAVE_SSHD%==1 net stop sshd
    if %HAVE_SSHD%==0 @echo ... did not run
@echo Service: cygserver
    sc query cygserver | find "RUNNING" >nul
    if not errorlevel 1 set HAVE_CYGSERVER=1
    if %HAVE_CYGSERVER%==1 @echo ... stopping
    if %HAVE_CYGSERVER%==1 net stop cygserver
    if %HAVE_CYGSERVER%==0 @echo ... did not run
@REM ==================================================
@echo CYGWIN SETUP
%SETUP%.exe --no-desktop --delete-orphans
@echo.
@REM ==================================================
@REM Restore running services
@REM ==================================================
if %HAVE_CYGSERVER%==1 @echo Starting cygserver
if %HAVE_CYGSERVER%==1 net start cygserver
if %HAVE_CYGSERVER%==0 @echo cygserver did not run

if %HAVE_SSHD%==1 @echo Starting sshd
if %HAVE_SSHD%==1 net start sshd
if %HAVE_SSHD%==0 @echo sshd did not run

if %HAVE_MYSQLD%==1 @echo Starting mysqld
if %HAVE_MYSQLD%==1 net start mysqld
if %HAVE_MYSQLD%==0 @echo mysqld did not run

set OLD_PATH=%PATH%
set PATH=C:\cygwin\bin;C:\cygwin\usr\local\bin;%PATH%
if %HAVE_HTTPD%==1 @echo Starting httpd
if %HAVE_HTTPD%==1 "%MY_CYGWIN_PATH%\bin\bash" /usr/sbin/apachectl -k start
if %HAVE_HTTPD%==0 @echo httpd did not run
set PATH=%OLD_PATH%

:END
@echo Done.
pause