LGP Startup/Shutdown Script

Author: Zinthose (talk, contrib)

UNSTABLE RELEASE

This release is in development and should not be used in a production environment.

Origin

I needed to deploy the nVidia driver update to the systems within my company. To make the process as painless as possible, I wanted the process to run before the user logs into the system as the install requires a reboot. By using the Local Group Policy Scripting service, we are able to perform the update without forcing the user to log on twice due to reboot. This also further prevents the user from interrupting the update.

Purpose

Intended for use in cooperate environments with a deployment system like Symantec's Altiris or Microsoft's System Management Servers.

!! Caution !!

The scripts need to be removed after execution. This has the potential to enter a continuous reboot cycle if installing software that reboots after completion but fails to remove the LGP Script entry. If you get into this situation, you will need to boot the system into safe mode and remove the entries manually. Removal can be done by modifying the Registry and the script.ini files manually, running a previously generated "removal" NSI script, or using the GPEdit.msc utility.

DO NOT ATTEMPT TO USE THIS IF YOU DON'T UNDERSTAND WHAT THE LOCAL GROUP POLICY SCRIPTS ARE AND DO.
USE AT YOUR OWN RISK!

Functions

${LGPScript::Create}
     Mode       = 'Startup' Or 'Shutdown'
     Command    = ${PathToExecutable}
     Parameters = ${ParametersForCommand}
     ReturnCode = 0 = 'Success' Or -1 = 'Failed'
 
${LGPScript::Remove}
     Mode       = 'Startup' Or 'Shutdown'
     Command    = ${PathToExecutable}
     Parameters = ${ParametersForCommand}
     ReturnCode = 0 = 'Success' Or -1 = 'Failed'
 
${LGPScript::RemoveAll}
     Mode       = 'Startup' Or 'Shutdown'
     ReturnCode = 0 = 'Success' Or -1 = 'Failed'

Code

Eample

The following example demonstrates how to add Notepad to the system startup and shutdown. Not exactly useful but meh.. it was simple and shows how it executes before logon and after shutdown.

!include LGPScript.nsh
 
RequestExecutionLevel Admin
 
OutFile LGPScript_Example.exe
ShowInstDetails show
 
### Main
Section -Main
 
    ### Command to Run
        StrCpy $0 "$WINDIR\Notepad.exe"
 
    ### Get the short pathname, as spaces break the LGP scripts
        GetFullPathName /SHORT $0 $0
 
    ### Prompt to remove any existing LGP scripts
        MessageBox MB_YESNO|MB_ICONQUESTION|MB_DEFBUTTON2|MB_SETFOREGROUND|MB_TOPMOST \
            "Do you want to remove all existing Local Group Policy Scripts?" \
            /SD IDNO IDNO SkipRemoveAll
 
    ### Remove Existing Startup Scripts      
        ${LGPScript::RemoveAll} 'Startup' $1
        DetailPrint "RemoveAll startup LGP entries:$1"
 
    ### Remove Existing Shutdown Scripts
        ${LGPScript::RemoveAll} 'Shutdown' $1
        DetailPrint "RemoveAll shutdown LGP entries:$1"
        SkipRemoveAll:
 
    ### Prompt to add the sample LGP script
        MessageBox MB_YESNO|MB_ICONQUESTION|MB_DEFBUTTON2|MB_SETFOREGROUND|MB_TOPMOST \
            "Do you want to add notepad to the startup LGP?" \
            /SD IDNO IDNO SkipStartup
 
    ### Add Startup Script
        ${LGPScript::Create} 'Startup' '$0' '' $R1
        DetailPrint "Create startup LGP return code:$R1"
        SkipStartup:
 
    ### Prompt to add the sample LGP script
        MessageBox MB_YESNO|MB_ICONQUESTION|MB_DEFBUTTON2|MB_SETFOREGROUND|MB_TOPMOST \
            "Do you want to add notepad to the shutdown LGP?" \
            /SD IDNO IDNO SkipShutdown
 
    ### Add Shutdown Script
        ${LGPScript::Create} 'Shutdown' '$0' '' $R1
        DetailPrint "Create shutdown LGP return code:$R1"
        SkipShutdown:
 
        DetailPrint "Reboot this system to see the results..."
SectionEnd

NSIS Library

Update: Added macros to allow for use during un.installations.

; ---------------------
;       LGPScript.nsh
; ---------------------
;
; Allows for execution of an application at system startup just prior
; to user Logon using the Local Group Policy (LGP) Service.
;
 
 
!warning "ALPHA Release - Not Fully Tested"
!echo "Known Issues:$\n*  OS Version Checks need added$\n*  Error Checking is incomplete"
 
!ifndef ___LGPSCRIPT__NSH___
!define ___LGPSCRIPT__NSH___
 
!define _LGPScript_INIPATH '$SYSDIR\GroupPolicy\Machine'
!define _LGPScript_INIFILE '${_LGPScript_INIPATH}\Scripts\scripts.ini'
!define _LGPScript_REGPATH 'SOFTWARE\Policies\Microsoft\Windows\System\Scripts'
 
!define _LGPScript_Path_Machine_StartUp  '${_LGPScript_INIPATH}\Scripts\Startup'
!define _LGPScript_Path_Machine_Shutdown '${_LGPScript_INIPATH}\Scripts\Shutdown'
!define _LGPScript_Path_User_StartUp     '$SYSDIR\GroupPolicy\User\Scripts\Startup'
!define _LGPScript_Path_User_Shutdown    '$SYSDIR\GroupPolicy\User\Scripts\Shutdown'
 
!include x64.nsh
!include LogicLib.nsh
!include Registry.nsh # Available at: http://nsis.sourceforge.net/Registry_plug-in
 
### Public Function Macros
 
    !define LGPScript::Create "!insertmacro _LGPScript_Create"
    !macro _LGPScript_Create Mode Command Parameters ReturnCode
        Push "${Mode}"
        Push "${Command}"
        Push "${Parameters}"
        !ifdef __UNINSTALL__
            Call un._LGPScript_Create
        !else
            Call _LGPScript_Create
        !endif
        Pop ${Returncode}
    !macroend
 
    !define LGPScript::Remove "!insertmacro _LGPScript_Remove"
    !macro _LGPScript_Remove Mode Command Parameters ReturnCode
        Push "${Mode}"
        Push "${Command}"
        Push "${Parameters}"
        !ifdef __UNINSTALL__
            Call un._LGPScript_Remove
        !else
            Call _LGPScript_Remove
        !endif
        Pop ${ReturnCode}
    !macroend
 
    !define LGPScript::RemoveAll "!insertmacro _LGPScript_RemoveAll"
    !Macro _LGPScript_RemoveAll Mode ReturnCode
        Push "${Mode}"
        !ifdef __UNINSTALL__
            Call un._LGPScript_RemoveAll
        !else
            Call _LGPScript_RemoveAll
        !endif
        Pop ${ReturnCode} 
    !macroend
 
### Internal Function Macros
 
    !define LGPScript::_SaveToINI "!insertmacro _LGPScript_SaveToINI"
    !macro _LGPScript_SaveToINI Mode
        Push "${Mode}"
        !ifdef __UNINSTALL__
            Call un._LGPScript_SaveToINI
        !else
            Call _LGPScript_SaveToINI
        !endif
    !macroend
 
    !define LGPScript::_GetLGPRegPath "!insertmacro _LGPScript_GetLGPRegPath"
    !macro _LGPScript_GetLGPRegPath Mode RegPath
        Push "${Mode}"
        !ifdef __UNINSTALL__
            Call un._LGPScript_GetLGPRegPath
        !else
            Call _LGPScript_GetLGPRegPath
        !endif
        Pop ${RegPath}
    !macroend
 
    !define LGPScript::_ReindexLGP "!insertmacro _LGPScript_ReindexLGP"
    !macro _LGPScript_ReindexLGP Mode ReturnCode
        Push "${Mode}"
        !ifdef __UNINSTALL__
            Call un._LGPScript_ReindexLGP
        !else
            Call _LGPScript_ReindexLGP
        !endif
        Pop ${ReturnCode}
    !macroend
 
    !define LGPScript::_CreateLGP "!insertmacro _LGPScript_CreateLGP"
    !macro _LGPScript_CreateLGP RegPath ReturnCode
        Push "${RegPath}"
        !ifdef __UNINSTALL__
            Call un._LGPScript_CreateLGP
        !else
            Call _LGPScript_CreateLGP
        !endif
        Pop ${ReturnCode}
    !macroend
 
    !define LGPScript::_Find "!insertmacro _LGPScript_Find"
    !macro _LGPScript_Find Mode Command Parameters RegPath
        Push "${Mode}"
        Push "${Command}"
        Push "${Parameters}"
        !ifdef __UNINSTALL__
            Call un._LGPScript_Find
        !else
            Call _LGPScript_Find
        !endif
        Pop ${RegPath}
    !macroend
 
### Public Functions
!macro __LGPScript_RemoveAll un
Function ${un}_LGPScript_RemoveAll ; (Mode) (ReturnCode)
    ClearErrors
    ## Preserve registers
                    ; Stack: Mode
        Exch $0     ; Stack: $0
        Push $1      ; Stack: $1 $0
        Push $2      ; Stack: $2 $1 $0
        ; $0 = Mode
 
    ## Get LGP Path
        ${LGPScript::_GetLGPRegPath} $0 $1
        ${if} $1 == -1
            ## Nothing to delete
            StrCpy $0 0
            Goto FunctionExit
        ${endif}
 
    ## Remove Registry Key
        ${registry::KeyExists} "HKLM\$1" $2
        ${If} $2 == -1
            ## Nothing to delete
            StrCpy $0 0
            Goto FunctionExit
        ${EndIf}
 
        ${registry::DeleteKey} "HKLM\$1" $2
        ${If} $2 == -1
            ## Error Deleting Key
            StrCpy $0 -1
            Goto FunctionExit
        ${EndIf}
 
    ## Windows x64?
        ${If} ${RunningX64}
            ${DisableX64FSRedirection}
        ${EndIf}
 
    ## Remove from INI
        DeleteINISec "${_LGPScript_INIFILE}" $0
 
        ## Windows x64?
            ${If} ${RunningX64}
                ${EnableX64FSRedirection}
            ${EndIf}
 
        ${If} ${Errors}
            ## Error Deleting INI Section
            StrCpy $0 -1
            Goto FunctionExit
        ${EndIf}
 
    StrCpy $0 0
    FunctionExit:
 
    ## Restore Registers
                ; Stack: $2 $1 $0
        Pop $2  ; Stack: $1 $0
        Pop $1  ; Stack: $0
        Exch $0 ; Stack: <ReturnCode>
FunctionEnd
!macroend
!insertmacro __LGPScript_RemoveAll ""
!insertmacro __LGPScript_RemoveAll "un."
 
!macro __LGPScript_Remove un
Function ${un}_LGPScript_Remove ; (Mode, Command, Parameters) (ReturnCode)
    ClearErrors
    ## Preserve registers
                    ; Stack: Parameters Command Mode
        Exch $0     ; Stack: $0 Command Mode
        Exch 2      ; Stack: Mode Command $0
        Exch $1     ; Stack: $1 Command $0
        Exch        ; Stack: Command $1 $0
        Exch $2     ; Stack: $2 $1 $0
        ; $0 = Parameters
        ; $1 = Mode
        ; $2 = Command
 
    ## Search for LGP Script
        ${LGPScript::_Find} $1 $2 $0 $0
 
    ## If Script not found Exit    
        ${if} $0 == -1
            ## Script Dosen't Exist
            StrCpy $0 -1
            Goto FunctionExit
        ${endif}
 
     ## Remove LGP Script
        ${registry::DeleteKey} "HKLM\$0" $2
        ${if} $2 == -1
            ## Script Dosen't Exist
            StrCpy $0 -1
            Goto FunctionExit
        ${endif}
 
     ## Reindex Registry Keys
         ${LGPScript::_ReindexLGP} $1 $2
 
    ## ReWrite Values to INI File
        ${LGPScript::_SaveToINI} $1
 
     StrCpy $0 0
     FunctionExit:
     ## Restore Registers
        ; Stack: $2 $1 $0
        Pop $2  ; Stack: $1 $0
        Pop $1  ; Stack: $0
        Exch $0 ; Stack: <ReturnCode>
FunctionEnd
!macroend
!insertmacro __LGPScript_Remove ""
!insertmacro __LGPScript_Remove "un."
 
!macro __LGPScript_Create un
Function ${un}_LGPScript_Create ; (Mode, Command, Parameters) (ReturnCode)
    ClearErrors
    ## Preserve registers
                    ; Stack: Parameters Command Mode
        Exch $0     ; Stack: $0 Command Mode
        Exch 2      ; Stack: Mode Command $0
        Exch $1     ; Stack: $1 Command $0
        Exch        ; Stack: Command $1 $0
        Exch $2     ; Stack: $2 $1 $0
        Push $3     ; Stack: $3 $2 $1 $0
        Push $4     ; Stack: $4 $3 $2 $1 $0
        Push $5     ; Stack: $5 $4 $3 $2 $1 $0
        Push $6     ; Stack: $6 $5 $4 $3 $2 $1 $0
        ; $0 = Parameters
        ; $1 = Mode
        ; $2 = Command
 
    ## Verify Script not previously defined
        ${LGPScript::_Find} $1 $2 $0 $3
 
        ${if} $3 != -1
            ## Previously Defined BreakOut
 
            StrCpy $0 0
            Goto FunctionExit
        ${endif}
 
    ## Get LGP Path
        ${LGPScript::_GetLGPRegPath} $1 $3
 
    ## Get Next Available LGP index
        ${for} $4 0 1000
            !warning "Current Local LGP index lookup is based on {registry::KeyExists} and dose not validate against invalid or empty definitions"
            ${registry::KeyExists} 'HKLM\$3\$4' $5
            ${If} $5 == -1
                StrCpy $3 "$3\$4"
                ${ExitFor}
            ${ElseIf} $4 == 1000
                ## FAIL: No available index positions detected [Highly unlikly]
                ;StrCpy $3 "$3\0"
                StrCpy $0 -1
                Goto FunctionExit
            ${EndIf}
        ${next}
 
    ## Write Script Definition into the Registry
        ${registry::Write} "HKLM\$3" "ExecTime"     "0000000000000000" "REG_QWORD" $4
 
        ${If} $4 == -1
            StrCpy $0 -1
            Goto FunctionExit
        ${EndIf}
 
        ${registry::Write} "HKLM\$3" "Parameters"   `$0` "REG_SZ" $4
        ${If} $4 == -1
            StrCpy $0 -1
            Goto FunctionExit
        ${EndIf}
 
        ${registry::Write} "HKLM\$3" "Script"       `$2` "REG_SZ" $4
        ${If} $4 == -1
            StrCpy $0 -1
            Goto FunctionExit
        ${EndIf}
 
    ## Reindex Registry Keys
         ${LGPScript::_ReindexLGP} $1 $2
 
    ## Write Values to INI File
        ${LGPScript::_SaveToINI} $1
 
    StrCpy $0 0
    FunctionExit:
    ## Restore Registers
                ; Stack: $6 $5 $4 $3 $2 $1 $0
        Pop $6  ; Stack: $5 $4 $3 $2 $1 $0
        Pop $5  ; Stack: $4 $3 $2 $1 $0
        Pop $4  ; Stack: $3 $2 $1 $0
        Pop $3  ; Stack: $2 $1 $0
        Pop $2  ; Stack: $1 $0
        Pop $1  ; Stack: $0
        Exch $0 ; Stack: <ReturnCode>
 
FunctionEnd
!macroend
!insertmacro __LGPScript_Create ""
!insertmacro __LGPScript_Create "un."
 
### Internal Functions
!macro __LGPScript_ReindexLGP un
Function ${un}_LGPScript_ReindexLGP ;(Mode) (ReturnCode)
    ClearErrors
    ## Preserve registers
                    ; Stack: <Mode>
        Exch $0     ; Stack: $0
        Push $1     ; Stack: $1 $0
        Push $2     ; Stack: $2 $1 $0
        Push $3     ; Stack: $3 $2 $1 $0
        Push $4     ; Stack: $4 $3 $2 $1 $0
        Push $5     ; Stack: $5 $4 $3 $2 $1 $0
        Push $6     ; Stack: $6 $4 $3 $2 $1 $0
        ;$0 = Mode
 
    ## Get LGP Path
        ${LGPScript::_GetLGPRegPath} $0 $0
 
    ## Init
        StrLen $1 "$0"
        StrCpy $2 -1
        ${registry::Open} "HKLM\$0" "/K=0 /V=1 /S=0 /G=1 /T=REG_SZ /B=1 /N=Script" $3
 
    ## Use search and counter to identify ordering
        ${do}
            IntOp $2 $2 + 1
 
            ${registry::Find} "$3" $4 $5 $5 $6
 
            ${if} $6 == ""
                ${ExitDo}
            ${endif}
 
            ## Determine the StringOffset of the Index Key
                StrLen $5 $4
                IntOp $5 $1 - $5
                IntOp $5 $5 + 1
 
            ## Get Index Key
                StrCpy $6 $4 "" $5
 
            ;DetailPrint "Counter=$2"
            ;DetailPrint "Index=$6"
            ## Test
                ${If} $6 == $2
                    ${Continue}
                ${EndIf}
 
            ;DetailPrint "Counter<>Index"
 
            ## Out Of Order
                ${registry::MoveKey} "HKLM\$4" "HKLM\$0\$2" $5
            ;DetailPrint "Source=HKLM\$4"
            ;DetailPrint "Destin=HKLM\$0\$2"
            ;DetailPrint "Result=$5"
                ${If} $5 == -1
                    StrCpy $0 -1
                    Goto FunctionExit
                ${EndIf}        
        ${loop}
 
    StrCpy $0 0
    FunctionExit:
    ${registry::Close} "$3"
    ClearErrors
    ## Restore Registers
                ; Stack: $6 $5 $4 $3 $2 $1 $0
        Pop $6  ; Stack: $5 $4 $3 $2 $1 $0
        Pop $5  ; Stack: $4 $3 $2 $1 $0
        Pop $4  ; Stack: $3 $2 $1 $0
        Pop $3  ; Stack: $2 $1 $0
        Pop $2  ; Stack: $1 $0
        Pop $1  ; Stack: $0
        Exch $0 ; Stack: <ReturnCode>
FunctionEnd
!macroend
!insertmacro __LGPScript_ReindexLGP ""
!insertmacro __LGPScript_ReindexLGP "un."
 
!macro __LGPScript_SaveToINI un
Function ${un}_LGPScript_SaveToINI ;(Mode)
    ClearErrors
    ## Preserve Registers
                    ; Stack: <Mode>
        Exch $0     ; Stack: $0
        Push $1     ; Stack: $1 $0
        Push $2     ; Stack: $2 $1 $0
        Push $3     ; Stack: $3 $2 $1 $0
        Push $4     ; Stack: $4 $3 $2 $1 $0
        Push $5     ; Stack: $5 $4 $3 $2 $1 $0
        Push $R1    ; Stack: $R1 $5 $4 $3 $2 $1 $0
        Push $R2    ; Stack: $R2 $R1 $5 $4 $3 $2 $1 $0
        Push $R3    ; Stack: $R3 $R2 $R1 $5 $4 $3 $2 $1 $0
        Push $R4    ; Stack: $R4 $R3 $R2 $R1 $5 $4 $3 $2 $1 $0
        ;$0 = Mode
 
    ## Windows x64?
        ${If} ${RunningX64}
            ${DisableX64FSRedirection}
        ${EndIf}
 
    ## Delete INI Section for Rewrite
        DeleteINISec "${_LGPScript_INIFILE}" "$0"
 
    ## Windows x64?
        ${If} ${RunningX64}
            ${EnableX64FSRedirection}
        ${EndIf}
 
    ## Get LGP Path
        ${LGPScript::_GetLGPRegPath} $0 $1
 
    ## Loop Registry and save values to INI   
        StrLen $2 "$1"
        ${registry::Open} "HKLM\$1" "/K=0 /V=1 /S=0 /G=1 /T=REG_SZ /B=1 /N=Script" $3
 
        ${Do}
 
            ${registry::Find} "$3" $R1 $R2 $R3 $R4
 
            ${if} $R4 == ""
                ${ExitDo}
            ${endif}
 
            ## Determine the StringOffset of the Index Key
                StrLen $4 $R1
                IntOp $4 $2 - $4
                IntOp $4 $4 + 1
 
            ## Get Index Key
                StrCpy $R4 $R1 "" $4
 
            ## Windows x64?
                ${If} ${RunningX64}
                    ${DisableX64FSRedirection}
                ${EndIf}
 
            WriteINIStr "${_LGPScript_INIFILE}" "$0" "$R4CmdLine" "$R3"
 
            ${registry::Read} "HKLM\$R1" "Parameters" $4 $5
 
            WriteINIStr "${_LGPScript_INIFILE}" "$0" "$R4Parameters" "$4"
 
            ## Windows x64?
                ${If} ${RunningX64}
                    ${EnableX64FSRedirection}
                ${EndIf}
 
        ${loop}
 
        ${registry::Close} "$3"
        ClearErrors
 
    ## Windows x64?
        ;${If} ${RunningX64}
        ;    ${DisableX64FSRedirection}
        ;${EndIf}
 
    ## Restore Registers
                    ; Stack: $R4 $R3 $R2 $R1 $5 $4 $3 $2 $1 $0
        Pop $R4     ; Stack: $R3 $R2 $R1 $5 $4 $3 $2 $1 $0
        Pop $R3     ; Stack: $R2 $R1 $5 $4 $3 $2 $1 $0
        Pop $R2     ; Stack: $R1 $5 $4 $3 $2 $1 $0
        Pop $R1     ; Stack: $5 $4 $3 $2 $1 $0
        Pop $5      ; Stack: $4 $3 $2 $1 $0
        Pop $4      ; Stack: $3 $2 $1 $0
        Pop $3      ; Stack: $2 $1 $0
        Pop $2      ; Stack: $1 $0
        Pop $1      ; Stack: $0
        Pop $0      ; Stack: 
 
FunctionEnd
!macroend
!insertmacro __LGPScript_SaveToINI ""
!insertmacro __LGPScript_SaveToINI "un."
 
!macro __LGPScript_Find un
Function ${un}_LGPScript_Find ; (Mode, Command, Parameters) (RegPath)
    ClearErrors
    ## Preserve registers
                    ; Stack: Parameters Command Mode
        Exch $0     ; Stack: $0 Command Mode
        Exch 2      ; Stack: Mode Command $0
        Exch $1     ; Stack: $1 Command $0
        Exch        ; Stack: Command $1 $0
        Exch $2     ; Stack: $2 $1 $0
        Push $3     ; Stack: $3 $2 $1 $0
        Push $4     ; Stack: $4 $3 $2 $1 $0
        Push $5     ; Stack: $5 $4 $3 $2 $1 $0
        Push $6     ; Stack: $6 $5 $4 $3 $2 $1 $0
        Push $7     ; Stack: $7 $6 $5 $4 $3 $2 $1 $0
        Push $8     ; Stack: $8 $7 $6 $5 $4 $3 $2 $1 $0
        ; $0 = Parameters
        ; $1 = Mode
        ; $2 = Command
 
    ## Get LGP Path
        ${LGPScript::_GetLGPRegPath} $1 $3
 
    ## Search
        ${Registry::Open} "HKLM\$3" "/K=0 /V=0 /S=1 /B=1 /N='$2'" $4
        ${DoUntil} $4 == 0
 
            ${Registry::Find} "$4" $5 $6 $7 $8
 
            ${if} $5 == ""
                ${ExitDo}
            ${endif}
 
            ${if} $6 == "Script"
                ${registry::Read} "HKLM\$5" "Parameters" $6 $7
                ${if} $6 == $0
                    StrCpy $0 $5
                    ${Registry::Close} $4
                    Goto FunctionExit
                ${endif}
            ${endif}
        ${Loop}
        ${Registry::Close} $4
 
    ## Failed to find it
        StrCpy $0 -1
 
    FunctionExit:
    ## Restore registers
                ; Stack: $8 $7 $6 $5 $4 $3 $2 $1 $0
        Pop $8  ; Stack: $7 $6 $5 $4 $3 $2 $1 $0
        Pop $7  ; Stack: $6 $5 $4 $3 $2 $1 $0
        Pop $6  ; Stack: $5 $4 $3 $2 $1 $0
        Pop $5  ; Stack: $4 $3 $2 $1 $0
        Pop $4  ; Stack: $3 $2 $1 $0
        Pop $3  ; Stack: $2 $1 $0
        Pop $2  ; Stack: $1 $0
        Pop $1  ; Stack: $0
        Exch $0 ; Stack: <RegPath / RC>
FunctionEnd
!macroend
!insertmacro __LGPScript_Find ""
!insertmacro __LGPScript_Find "un."
 
!macro __LGPScript_CreateLGP un
Function ${un}_LGPScript_CreateLGP ; LGPRegPath (ReturnCode)
    ClearErrors
    ## Preserve registers
                    ; Stack: <LGPRegPath>
        Exch $0     ; Stack: $0
        Push $1     ; Stack: $1 $0
 
    ## If we are running on a Windows x64 system we need to dispable file redirection to ensure we get the correct System32 Path
        ${If} ${RunningX64}
            ${DisableX64FSRedirection}
        ${EndIf}
 
    ## Write Standard Template to Registry
        ${registry::Write} "HKLM\$0" "FileSysPath"  "$SYSDIR\GroupPolicy\Machine"   "REG_SZ" $1
        ${registry::Write} "HKLM\$0" "DisplayName"  "Local Group Policy"            "REG_SZ" $1
        ${registry::Write} "HKLM\$0" "GPO-ID"       "LocalGPO"                      "REG_SZ" $1
        ${registry::Write} "HKLM\$0" "GPOName"      "Local Group Policy"            "REG_SZ" $1
        ${registry::Write} "HKLM\$0" "SOM-ID"       "Local"                         "REG_SZ" $1
 
        ${If} ${RunningX64}
            ${EnableX64FSRedirection}
        ${EndIf}
 
    ## Check for Errors
        ${If} ${Errors}
            StrCpy $0 -1
        ${else}
            StrCpy $0 0
        ${EndIf}
 
    ## Restore registers
                    ; Stack: $1 $0
        Pop $1      ; Stack: $0
        Exch $0     ; Stack: RetuenCode
FunctionEnd
!macroend
!insertmacro __LGPScript_CreateLGP ""
!insertmacro __LGPScript_CreateLGP "un."
 
!macro __LGPScript_GetLGPRegPath un
Function ${un}_LGPScript_GetLGPRegPath ;(Mode) (RegPath)
    ClearErrors
    ## Preserve registers
                    ; Stack: <Mode>
        Exch $0     ; Stack: $0
        Push $1     ; Stack: $1 $0
        Push $2     ; Stack: $2 $1 $0
        Push $3     ; Stack: $3 $2 $1 $0
        Push $4     ; Stack: $4 $3 $2 $1 $0
        Push $5     ; Stack: $5 $4 $3 $2 $1 $0
        ;$0 = Mode
 
    ## Windows x64 Check
        ;${If} ${RunningX64}
        ;    SetRegView 64
        ;${EndIf}
 
    ## Quickly Test to see if any Startup Scripts are defined
        ${registry::KeyExists} 'HKLM\${_LGPScript_REGPATH}\$0' $1
 
        ${If} $1 == -1
            ## It appears as the LocalGPO is not defined.
 
            StrCpy $0 '${_LGPScript_REGPATH}\$0\0'
 
            ${LGPScript::_CreateLGP} $0 $1
 
            ${if} $1 == -1
                StrCpy $0 -1
            ${endif}
            Goto FunctionExit
        ${EndIf}
 
    ## Search for Local LGP
        ${Registry::Open} "HKLM\${_LGPScript_REGPATH}\$0" "/K=0 /V=0 /S=1 /B=1 /N='LocalGPO'" $1
        ${DoUntil} $1 == 0
 
            ${Registry::Find} "$1" $2 $3 $4 $5
 
            ${if} $5 == ""
                ${ExitDo}
            ${endif}
 
            ${if} $3 == "GPO-ID"
                StrCpy $0 $2
                ${Registry::Close} $1
                Goto FunctionExit
            ${endif}
 
        ${Loop}
        ${Registry::Close} $1
 
    ## No Local LGP detected, Looks like we need to create one.
 
    ## Locate next available LGP index
        ${for} $1 0 100
            ${registry::KeyExists} 'HKLM\${_LGPScript_REGPATH}\$0\$1' $2
 
            ${if} $2 == -1
 
                StrCpy $0 '${_LGPScript_REGPATH}\$0\$1'
                ${LGPScript::_CreateLGP} $0 $1
 
                Goto FunctionExit
            ${endif}
        ${next}
 
    ## Epic Fail if here
        StrCpy $0 -1
 
    FunctionExit:
    ## Restore the registers
                    ; Stack: $5 $4 $3 $2 $1 $0
        Pop $5      ; Stack: $4 $3 $2 $1 $0
        Pop $4      ; Stack: $3 $2 $1 $0
        Pop $3      ; Stack: $2 $1 $0
        Pop $2      ; Stack: $1 $0
        Pop $1      ; Stack: $0
        Exch $0     ; Stack: <RegPath>
 
        ;${If} ${RunningX64}
        ;    SetRegView lastused
        ;${EndIf}
FunctionEnd
!macroend
!insertmacro __LGPScript_GetLGPRegPath ""
!insertmacro __LGPScript_GetLGPRegPath "un."
 
!endif # ___LGPSCRIPT__NSH___

ALPHA Rewrite using new technique

!ifndef ___LGPSCRIPTS__NSH___
!define ___LGPSCRIPTS__NSH___
 
!warning "LGPScripts.nsh - Working Release - In active development$\nKnown Issues:$\n*  Be gentle with me"
 
!include x64.nsh
!include ini.nsh
 
 
!define _LGP_Path "$SYSDIR\GroupPolicy"
!define _GPT.ini "${_LGP_Path}\gpt.ini"
 
/*
!define LGPValidateParams "!insertmacro _LGPValidateParams"
!macro _LGPValidateParams
    !if ! `${_Event}` == 'Startup'
        !if ! `${_Event}` == 'Shutdown'
            !error `Supplied parameter is invalid.  Expected "Shutdown" or "Startup" got "${_Event}"`
        !endif
    !endif
    !if ! `${_Context}` == 'Machine'
        !if ! `${_Context}` == 'User'
            !error `Supplied parameter is invalid.  Expected "Machine" or "User" got "${_Context}"`
        !endif
    !endif
!macroend
*/
 
!macro _initLGP _Context _Event
    ;${LGPValidateParams}
    ${If} ${RunningX64}
        ${DisableX64FSRedirection}
    ${EndIf}
 
    ${Unless} ${FileExists} `${_LGP_Path}\*.*`
        CreateDirectory `${_LGP_Path}`
        SetFileAttributes `${_LGP_Path}` NORMAL|HIDDEN
        ClearErrors
    ${EndIf}
 
    ${Unless} ${FileExists} `${_GPT.ini}`
        Push $0
        FileOpen $0 `${_GPT.ini}` a
        FileWrite $0 ``
        FileClose $0
        Pop $0
 
        WriteINIStr `${_GPT.ini}` General gPCFunctionalityVersion 2
    ${EndIf}
 
    ${Unless} ${FileExists} `${_LGP_Path}\${_Context}\Scripts\${_Event}\*.*`
        CreateDirectory `${_LGP_Path}\${_Context}\Scripts\${_Event}`
        ClearErrors
    ${EndIf}
 
    ${Unless} ${FileExists} `${_LGP_Path}\${_Context}\Scripts\scripts.ini`
        Push $0
        FileOpen $0 `${_LGP_Path}\${_Context}\Scripts\scripts.ini` a
        FileWrite $0 ``
        FileClose $0
        Pop $0
        SetFileAttributes `${_LGP_Path}\${_Context}\Scripts\scripts.ini` NORMAL|HIDDEN
    ${EndIf}
 
    !if ${_Context} == `User`
        WriteINIStr `${_GPT.ini}` General gPCUserExtensionNames "[{42B5FAAE-6536-11D2-AE5A-0000F87571E3}{40B66650-4972-11D1-A7CA-0000F87571E3}]"
    !endif
    !if ${_Context} == `Machine`
        WriteINIStr `${_GPT.ini}` General gPCMachineExtensionNames "[{42B5FAAE-6536-11D2-AE5A-0000F87571E3}{40B6664F-4972-11D1-A7CA-0000F87571E3}]"
    !endif
!macroend
!define initLGP "!insertmacro _initLGP"
 
!macro _LGPIncrement _Context
    ${If} ${RunningX64}
        ${DisableX64FSRedirection}
    ${EndIf}
    Push $0
    ReadINIStr $0 `${_GPT.ini}` General Version
    !if ${_Context} == `Machine`
        IntOp $0 $0 + 1
    !endif
    !if ${_Context} == `User`
        IntOp $0 $0 + 65536
    !endif
    WriteINIStr `${_GPT.ini}` General Version $0
    Pop $0
!macroend
!define LGPIncrement "!insertmacro _LGPIncrement"
 
!macro _UpdateGPO
    ${If} ${RunningX64}
        ${DisableX64FSRedirection}
    ${EndIf}
    ExecDos::exec /DETAILED `$SYSDIR\GPUpdate.exe`
!macroend
!define UpdateGPO "!insertmacro _UpdateGPO"
 
!macro _LGPAdd _Context _Event _CmdLine _Params
    ;${LGPValidateParams}
    Push `${_Context}`
    Push `${_Event}`
    Push `${_CmdLine}`
    Push `${_Params}`
    Call _LGPAdd
!macroend
!define LGPAdd "!insertmacro _LGPAdd"
 
!macro _LGPGetFreeIndex _Context _Event _Return
    ;${LGPValidateParams}
    Push `${_Context}`
    Push `${_Event}`
    Call _LGPGetFreeIndex
    ## TODO Check for Errors
    Pop ${_Return}
!macroend
!define LGPGetFreeIndex "!insertmacro _LGPGetFreeIndex"
 
!macro _LGPRemove _Context _Event _CmdLine _Params
    ;${LGPValidateParams}
    Push $0
 
    ${LGPExists} `${_Context}` `${_Event}` `${_CmdLine}` `${_Params}` $0
    ClearErrors
 
    ${If} $0 == ''
        DetailPrint `... Unable to locate ${_Context} LGP ${_Event} Script for removal: ${_CmdLine} ${_Params}`
    ${Else}
        DetailPrint `Deleting ${_Context} LGP ${_Event} Script: ${_CmdLine} ${_Params}`
        DeleteINIStr `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}` `$0Parameters`
        ClearErrors
        DeleteINIStr `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}` `$0CmdLine`
        ${If} ${Errors}
            DetailPrint `!!! Unable to remove LGP script`
            SetErrors
        ${Else}
            ${LGPReindex} `${_Context}` `${_Event}`
        ${EndIf}
    ${EndIf}
 
    Pop $0
!macroend
!define LGPRemove "!insertmacro _LGPRemove"
 
!macro _LGPExists _Context _Event _CmdLine _Params _RETURN
    ;${LGPValidateParams}
 
    DetailPrint `Searching for ${_Context} Local Group Policy ${_Event} Script: ${_CmdLine} ${_Params}`
 
    ${GetSection} `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}` 'CALLBACK_LGPExists' `${_CmdLine}$\n${_Params}` ${_RETURN}
    ${If} `${_RETURN}` == ''
        DetailPrint `... LGP script not found`
    ${Else}
        DetailPrint `... LGP script located at Index #${_RETURN}`
    ${EndIf}
!macroend
!define LGPExists "!insertmacro _LGPExists"
 
!macro _LGPReindex _Context _Event
    ;${LGPValidateParams}
    Push $0 # TempValue
    Push $1 # Index
    Push $2 # FreeID
 
    StrCpy $2 ''
 
    DetailPrint `Reindexing ${_Context} Local Group Policy ${_Event} Scripts...`
 
    ## TODO Rewrite ${LGPReindex} to use the ${GetSectionNames} function to avoid potential issues.
    ${For} $1 0 100
        ReadINIStr $0 `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}` `$1CmdLine`
        ${If} $0 == ``
            ${If} $2 = ''
                ;DetailPrint 'Index# $1 is blank'
                StrCpy $2 $1
            ${EndIf}
        ${Else}
            ${Unless} $2 = ''
                DetailPrint 'Moving script from index# $1 to index# $2'
                WriteINIStr `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}` `$2CmdLine` $0
                ReadINIStr $0 `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}` `$1Parameters`
                WriteINIStr `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}` `$2Parameters` $0
                DeleteINIStr `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}` `$1CmdLine`
                DeleteINIStr `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}` `$1Parameters`
 
                StrCpy $1 $2
                StrCpy $2 ''
            ${EndIf}
        ${EndIf}
    ${Next}
 
    Pop $2
    Pop $1
    Pop $0
!macroend
!define LGPReindex "!insertmacro _LGPReindex"
 
!macro _LGPRemoveAll _Context _Event
    ;${LGPValidateParams}
    ClearErrors
    DeleteINISec `${_LGP_Path}\${_Context}\Scripts\scripts.ini` `${_Event}`
    ${Unless} ${Errors}
        DetailPrint `All ${_Context} LGP ${_Event} Scripts have been removed`
    ${EndIf}
    ClearErrors
!macroend
!define LGPRemoveAll "!insertmacro _LGPRemoveAll"
 
Function CALLBACK_LGPExists
    ${If} ${RunningX64}
        ${DisableX64FSRedirection}
    ${EndIf}
            ; Stack: _FILENAME _SECTIONNAME _STRINGRIGHT _STRINGLEFT _SPECIAL
    Exch $0 ; Stack: $0 _SECTIONNAME _STRINGRIGHT _STRINGLEFT _SPECIAL
    Exch 4  ; Stack: _SPECIAL _SECTIONNAME _STRINGRIGHT _STRINGLEFT $0
    Exch $1 ; Stack: $1 _SECTIONNAME _STRINGRIGHT _STRINGLEFT $0
    Exch 3  ; Stack: _STRINGLEFT _SECTIONNAME _STRINGRIGHT $1 $0
    Exch $2 ; Stack: $2 _SECTIONNAME _STRINGRIGHT $1 $0
    Exch 2  ; Stack: _STRINGRIGHT _SECTIONNAME $2 $1 $0
    Exch $3 ; Stack: $3 _SECTIONNAME $2 $1 $0
    Exch    ; Stack: _SECTIONNAME $3 $2 $1 $0
    Exch $4 ; Stack: $4 $3 $2 $1 $0
    Push $5 ; Stack: $5 $4 $3 $2 $1 $0
    Push $6 ; Stack: $6 $5 $4 $3 $2 $1 $0
    Push $7 ; Stack: $7 $6 $5 $4 $3 $2 $1 $0
    Push $8 ; Stack: $8 $7 $6 $5 $4 $3 $2 $1 $0
    /*
        _FILENAME   : $0
        _SPECIAL    : $1
        _STRINGLEFT : $2
        _STRINGRIGHT: $3
        _SECTIONNAME: $4
    */
 
    StrCpy $5 $2 "" -7
 
    ${If} $5 == "CmdLine"
        # _STRING _DELIMITER _STRINGLEFT _STRINGRIGHT
            ${SplitStr} $1 "$\n" $6 $7
 
        ${If} $6 == $3
            StrLen $5 $2
            IntOp $5 $5 - 7
            StrCpy $5 $2 $5
 
            ReadINIStr $8 $0 $4 `$5Parameters`
 
            ${If} $8 == $7
                StrCpy $0 $5
                Goto End
            ${EndIf}
        ${EndIf}
    ${EndIf}
    StrCpy $0 ''
    End:
            ; Stack: $8 $7 $6 $5 $4 $3 $2 $1 $0
    Pop $8  ; Stack: $7 $6 $5 $4 $3 $2 $1 $0
    Pop $7  ; Stack: $6 $5 $4 $3 $2 $1 $0
    Pop $6  ; Stack: $5 $4 $3 $2 $1 $0
    Pop $5  ; Stack: $4 $3 $2 $1 $0
    Pop $4  ; Stack: $3 $2 $1 $0
    Pop $3  ; Stack: $2 $1 $0
    Pop $2  ; Stack: $1 $0
    Pop $1  ; Stack: $0
    Exch $0 ; Stack: _RETVAL
 
FunctionEnd    
 
Function _LGPGetFreeIndex
                ; Stack: _Event _Context
    Exch $R0    ; Stack: $R0 _Context
    Exch        ; Stack: _Context $R0
    Exch $R1    ; Stack: $R1 $R0
    Push $0     ; Stack: $0 $R1 $R0
    Push $1     ; Stack: $1 $0 $R1 $R0
 
    ## TODO Rewrite ${LGPGetFreeIndex} to use the ${GetSectionNames} function to avoid potential issues.
    ${For} $0 0 100
        ReadINIStr $1 `${_LGP_Path}\$R1\Scripts\scripts.ini` `$R0` `$0CmdLine`
        ${If} $1 == ``
            Goto End
        ${EndIf}
    ${Next}
 
    StrCpy $0 0
    ClearErrors
    End:
    Pop $1  ; Stack: $0 $R1 $R0
    Exch $0 ; Stack: _RETURN $R1 $R0
    Exch 2  ; Stack: $R0 $R1 _RETURN
    Pop $R0 ; Stack: $R1 _RETURN
    Pop $R1 ; Stack: _RETURN
FunctionEnd
 
Function _LGPAdd
 
             ;Stack: _Params _CmdLine _Event _Context
    Exch $R3 ;Stack: $R3 _CmdLine _Event _Context
    Exch 3   ;Stack: _Context _CmdLine _Event $R3
    Exch $R0 ;Stack: $R0 _CmdLine _Event $R3
    Exch     ;Stack: _CmdLine $R0 _Event $R3
    Exch $R2 ;Stack: $R2 $R0 _Event $R3
    Exch 2   ;Stack: _Event $R0 $R2 $R3
    Exch $R1 ;Stack: $R1 $R0 $R2 $R3
    Push $0  ;Stack: $0 $R1 $R0 $R2 $R3
    /*
        $R0 = _Context
        $R1 = _Event
        $R2 = _CmdLine
        $R3 = _Params
    */
    ClearErrors
 
    DetailPrint `Adding $R0 LGP $R1 Script: $R2 $R3`
 
    ${LGPExists} $R0 $R1 $R2 $R3 $0
    ${If} $0 == ''
        ${LGPGetFreeIndex} $R0 $R1 $0
 
        DetailPrint '... New script index# $0'
        ClearErrors
 
        WriteINIStr `${_LGP_Path}\$R0\Scripts\scripts.ini` $R1 `$0CmdLine` $R2
        WriteINIStr `${_LGP_Path}\$R0\Scripts\scripts.ini` $R1 `$0Parameters` $R3
 
        ${If} ${Errors}
            DetailPrint `!!! An Error occured adding script`
            SetErrors
        ${Else}
            DetailPrint `... Success`
        ${EndIf}
    ${Else}
        DetailPrint '... script allready exists at index #$0'
    ${EndIf}
 
    ;Stack: $0 $R1 $R0 $R2 $R3
        Pop $0
        Pop $R1
        Pop $R0
        Pop $R2
        Pop $R3
 
FunctionEnd
!endif