forked from mirror/go-ethereum
build: safe update of PATH on Windows (#3419)
NSIS has a default MAX_STR_LEN of 1024. If $ENV{PATH} is longer
the returned string is truncated to an empty string. Its then not
possible to distinguis between the variable not set or too long.
As a result the variable is set with the location where geth and/or
dev tools are installed. This may override any previous set values.
release/1.5
bas-vk
8 years ago
committed by
Felix Lange
parent
4e36b1e3da
commit
4f9ccdd70f
@ -0,0 +1,153 @@ |
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!include "WinMessages.nsh" |
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; see https://support.microsoft.com/en-us/kb/104011 |
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!define Environ 'HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"' |
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; HKEY_LOCAL_MACHINE = 0x80000002 |
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; AddToPath - Appends dir to PATH |
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; (does not work on Win9x/ME) |
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; |
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; Usage: |
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; Push "dir" |
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; Call AddToPath |
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Function AddToPath |
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Exch $0 |
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Push $1 |
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Push $2 |
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Push $3 |
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Push $4 |
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; NSIS ReadRegStr returns empty string on string overflow |
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; Native calls are used here to check actual length of PATH |
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; $4 = RegOpenKey(HKEY_LOCAL_MACHINE, "SYSTEM\CurrentControlSet\Control\Session Manager\Environment", &$3) |
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System::Call "advapi32::RegOpenKey(i 0x80000002, t'SYSTEM\CurrentControlSet\Control\Session Manager\Environment', *i.r3) i.r4" |
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IntCmp $4 0 0 done done |
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; $4 = RegQueryValueEx($3, "PATH", (DWORD*)0, (DWORD*)0, &$1, ($2=NSIS_MAX_STRLEN, &$2)) |
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; RegCloseKey($3) |
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System::Call "advapi32::RegQueryValueEx(i $3, t'PATH', i 0, i 0, t.r1, *i ${NSIS_MAX_STRLEN} r2) i.r4" |
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System::Call "advapi32::RegCloseKey(i $3)" |
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IntCmp $4 234 0 +4 +4 ; $4 == ERROR_MORE_DATA |
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DetailPrint "AddToPath: original length $2 > ${NSIS_MAX_STRLEN}" |
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MessageBox MB_OK "PATH not updated, original length $2 > ${NSIS_MAX_STRLEN}" |
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Goto done |
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IntCmp $4 0 +5 ; $4 != NO_ERROR |
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IntCmp $4 2 +3 ; $4 != ERROR_FILE_NOT_FOUND |
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DetailPrint "AddToPath: unexpected error code $4" |
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Goto done |
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StrCpy $1 "" |
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; Check if already in PATH |
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Push "$1;" |
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Push "$0;" |
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Call StrStr |
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Pop $2 |
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StrCmp $2 "" 0 done |
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Push "$1;" |
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Push "$0\;" |
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Call StrStr |
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Pop $2 |
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StrCmp $2 "" 0 done |
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; Prevent NSIS string overflow |
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StrLen $2 $0 |
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StrLen $3 $1 |
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IntOp $2 $2 + $3 |
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IntOp $2 $2 + 2 ; $2 = strlen(dir) + strlen(PATH) + sizeof(";") |
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IntCmp $2 ${NSIS_MAX_STRLEN} +4 +4 0 |
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DetailPrint "AddToPath: new length $2 > ${NSIS_MAX_STRLEN}" |
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MessageBox MB_OK "PATH not updated, new length $2 > ${NSIS_MAX_STRLEN}." |
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Goto done |
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; Append dir to PATH |
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DetailPrint "Add to PATH: $0" |
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StrCpy $2 $1 1 -1 |
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StrCmp $2 ";" 0 +2 |
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StrCpy $1 $1 -1 ; remove trailing ';' |
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StrCmp $1 "" +2 ; no leading ';' |
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StrCpy $0 "$1;$0" |
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WriteRegExpandStr ${Environ} "PATH" $0 |
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SendMessage ${HWND_BROADCAST} ${WM_WININICHANGE} 0 "STR:Environment" /TIMEOUT=5000 |
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done: |
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Pop $4 |
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Pop $3 |
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Pop $2 |
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Pop $1 |
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Pop $0 |
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FunctionEnd |
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; RemoveFromPath - Removes dir from PATH |
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; |
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; Usage: |
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; Push "dir" |
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; Call RemoveFromPath |
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Function un.RemoveFromPath |
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Exch $0 |
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Push $1 |
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Push $2 |
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Push $3 |
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Push $4 |
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Push $5 |
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Push $6 |
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; NSIS ReadRegStr returns empty string on string overflow |
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; Native calls are used here to check actual length of PATH |
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; $4 = RegOpenKey(HKEY_LOCAL_MACHINE, "SYSTEM\CurrentControlSet\Control\Session Manager\Environment", &$3) |
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System::Call "advapi32::RegOpenKey(i 0x80000002, t'SYSTEM\CurrentControlSet\Control\Session Manager\Environment', *i.r3) i.r4" |
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IntCmp $4 0 0 done done |
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; $4 = RegQueryValueEx($3, "PATH", (DWORD*)0, (DWORD*)0, &$1, ($2=NSIS_MAX_STRLEN, &$2)) |
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; RegCloseKey($3) |
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System::Call "advapi32::RegQueryValueEx(i $3, t'PATH', i 0, i 0, t.r1, *i ${NSIS_MAX_STRLEN} r2) i.r4" |
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System::Call "advapi32::RegCloseKey(i $3)" |
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IntCmp $4 234 0 +4 +4 ; $4 == ERROR_MORE_DATA |
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DetailPrint "RemoveFromPath: original length $2 > ${NSIS_MAX_STRLEN}" |
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MessageBox MB_OK "PATH not updated, original length $2 > ${NSIS_MAX_STRLEN}" |
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Goto done |
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IntCmp $4 0 +5 ; $4 != NO_ERROR |
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IntCmp $4 2 +3 ; $4 != ERROR_FILE_NOT_FOUND |
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DetailPrint "RemoveFromPath: unexpected error code $4" |
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Goto done |
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StrCpy $1 "" |
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; length < ${NSIS_MAX_STRLEN} -> ReadRegStr can be used |
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ReadRegStr $1 ${Environ} "PATH" |
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StrCpy $5 $1 1 -1 |
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StrCmp $5 ";" +2 |
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StrCpy $1 "$1;" ; ensure trailing ';' |
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Push $1 |
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Push "$0;" |
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Call un.StrStr |
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Pop $2 ; pos of our dir |
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StrCmp $2 "" done |
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DetailPrint "Remove from PATH: $0" |
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StrLen $3 "$0;" |
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StrLen $4 $2 |
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StrCpy $5 $1 -$4 ; $5 is now the part before the path to remove |
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StrCpy $6 $2 "" $3 ; $6 is now the part after the path to remove |
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StrCpy $3 "$5$6" |
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StrCpy $5 $3 1 -1 |
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StrCmp $5 ";" 0 +2 |
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StrCpy $3 $3 -1 ; remove trailing ';' |
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WriteRegExpandStr ${Environ} "PATH" $3 |
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SendMessage ${HWND_BROADCAST} ${WM_WININICHANGE} 0 "STR:Environment" /TIMEOUT=5000 |
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done: |
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Pop $6 |
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Pop $5 |
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Pop $4 |
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Pop $3 |
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Pop $2 |
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Pop $1 |
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Pop $0 |
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FunctionEnd |
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