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copied!<p>I wrote a function called <code>CheckFreeSpace</code> in NSIS to do this. Unfortunately it has the following limitations:</p> <ul> <li>To compute the size of all the sections in your installation, you have to modify <code>CheckFreeSpace</code> to add each section, by knowing each variable that each section id was written into. I can't find a way of iterating over all sections that will be installed using NSIS.</li> <li>Installation drive must be computed because <code>${DriveSpace}</code> requires a drive letter, not a path to an arbitrary directory. The drive letter string is computed with <code>StrCpy $instdrive $INSTDIR 3</code>. If the <code>$INSTDIR</code> variable is a relative path or does not begin with a string such as <code>C:\</code>, this will fail.</li> <li>If the installation cannot continue it produces a <code>MessageBox</code>. You can suppress the <code>MessageBox</code> by adding <code>/SD IDOK</code> at the end of the statement, but then the user is not informed of the installation failure: I can't find a way to emit to <code>stdout</code> from NSIS. Perhaps the return code from the installer is enough?</li> <li>If the disk free space is really low (like 10kb), the installer won't run at all; it doesn't have space to unpack its temporary DLL's into the <code>\tmp</code> directory.</li> </ul> <p>Also, in my implementation below, <code>CheckFreeSpace</code> has a hardcoded value for the space free after installation. Obviously that can be parameterized.</p> <p>Here it is within a sample installer:</p> <pre><code>!include FileFunc.nsh !insertmacro DriveSpace Name "CheckFreeSpace" OutFile "C:\CheckFreeSpace.exe" InstallDir C:\tmp\checkfreespace Page instfiles Section "install_section" install_section_id Call CheckFreeSpace CreateDirectory $INSTDIR SetOutPath $INSTDIR File "C:\installme.bat" WriteUninstaller "$INSTDIR\Uninstall.exe" DetailPrint "Installation Successful." SectionEnd Section "Uninstall" RMDIR /r "$INSTDIR" SectionEnd Function CheckFreeSpace var /GLOBAL installsize var /GLOBAL adjustedinstallsize var /GLOBAL freespace var /GLOBAL instdrive ; Verify that we have sufficient space for the install ; SectionGetSize returns the size of each section in kilobyte. SectionGetSize ${install_section_id} $installsize ; Adjust the required install size by 10mb, as a minimum amount ; of free space left after installation. IntOp $adjustedinstallsize $installsize + 10240 ; Compute the drive that is the installation target; the ; ${DriveSpace} macro will not accept a path, it must be a drive. StrCpy $instdrive $INSTDIR 3 ; Compute drive space free in kilobyte ${DriveSpace} $instdrive "/D=F /S=K" $freespace DetailPrint "Determined installer needs $adjustedinstallsize kb ($installsize kb) while $freespace kb is free" IntCmp $adjustedinstallsize $freespace spaceok spaceok MessageBox MB_OK|MB_ICONSTOP "Insufficient space for installation. Please free space for installation directory $INSTDIR and try again." DetailPrint "Insufficient space for installation. Installer needs $adjustedinstallsize kb, but freespace is only $freespace kb." Abort "Insufficient space for installation." spaceok: DetailPrint "Installation target space is sufficient" FunctionEnd </code></pre>

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