treewide: Make still dont* Variables are optional in most cases

Go beyond the obvious setup hooks now, with a bit of sed, with a skipped case:

 - cc-wrapper's `dontlink`, because it already is handled.

Also, in nix files escaping was manually added.

EMP

pkgs/build-support/build-dotnet-package/default.nix

@@ -29,9 +29,9 @@ attrsOrig @
       configurePhase = ''
         runHook preConfigure
 
-        [ -z "$dontPlacateNuget" ] && placate-nuget.sh
+        [ -z "''${dontPlacateNuget-}" ] && placate-nuget.sh
-        [ -z "$dontPlacatePaket" ] && placate-paket.sh
+        [ -z "''${dontPlacatePaket-}" ] && placate-paket.sh
-        [ -z "$dontPatchFSharpTargets" ] && patch-fsharp-targets.sh
+        [ -z "''${dontPatchFSharpTargets-}" ] && patch-fsharp-targets.sh
 
         runHook postConfigure
       '';
@@ -69,7 +69,7 @@ attrsOrig @
 
         cp -rv ${arrayToShell outputFiles} "''${outputFilesArray[@]}" "$target"
 
-        if [ -z "$dontRemoveDuplicatedDlls" ]
+        if [ -z "''${dontRemoveDuplicatedDlls-}" ]
         then
           pushd "$out"
           remove-duplicated-dlls.sh

pkgs/build-support/setup-hooks/auto-patchelf.sh

@@ -228,7 +228,7 @@ autoPatchelf() {
 # behaviour as fixupOutputHooks because the setup hook for patchelf is run in
 # fixupOutput and the postFixup hook runs later.
 postFixupHooks+=('
-    if [ -z "$dontAutoPatchelf" ]; then
+    if [ -z "${dontAutoPatchelf-}" ]; then
         autoPatchelf -- $(for output in $outputs; do
             [ -e "${!output}" ] || continue
             echo "${!output}"

pkgs/build-support/setup-hooks/patch-shebangs.sh

@@ -105,7 +105,7 @@ patchShebangs() {
 }
 
 patchShebangsAuto () {
-    if [ -z "$dontPatchShebangs" -a -e "$prefix" ]; then
+    if [ -z "${dontPatchShebangs-}" -a -e "$prefix" ]; then
 
         # Dev output will end up being run on the build platform. An
         # example case of this is sdl2-config. Otherwise, we can just

pkgs/build-support/setup-hooks/update-autotools-gnu-config-scripts.sh

@@ -1,7 +1,7 @@
 preConfigurePhases+=" updateAutotoolsGnuConfigScriptsPhase"
 
 updateAutotoolsGnuConfigScriptsPhase() {
-    if [ -n "$dontUpdateAutotoolsGnuConfigScripts" ]; then return; fi
+    if [ -n "${dontUpdateAutotoolsGnuConfigScripts-}" ]; then return; fi
 
     for script in config.sub config.guess; do
         for f in $(find . -type f -name "$script"); do

pkgs/build-support/setup-hooks/wrap-gapps-hook.sh

@@ -15,7 +15,7 @@ wrapGApp() {
     wrapProgram "$program" "${gappsWrapperArgs[@]}" "$@"
 }
 
-# Note: $gappsWrapperArgs still gets defined even if $dontWrapGApps is set.
+# Note: $gappsWrapperArgs still gets defined even if ${dontWrapGApps-} is set.
 wrapGAppsHook() {
   # guard against running multiple times (e.g. due to propagation)
   [ -z "$wrapGAppsHookHasRun" ] || return 0

pkgs/development/interpreters/python/hooks/flit-build-hook.sh

@@ -9,7 +9,7 @@ flitBuildPhase () {
     echo "Finished executing flitBuildPhase"
 }
 
-if [ -z "$dontUseFlitBuild" ] && [ -z "$buildPhase" ]; then
+if [ -z "${dontUseFlitBuild-}" ] && [ -z "$buildPhase" ]; then
     echo "Using flitBuildPhase"
     buildPhase=flitBuildPhase
 fi

pkgs/development/interpreters/python/hooks/pip-build-hook.sh

@@ -31,7 +31,7 @@ pipShellHook() {
     echo "Finished executing pipShellHook"
 }
 
-if [ -z "$dontUsePipBuild" ] && [ -z "$buildPhase" ]; then
+if [ -z "${dontUsePipBuild-}" ] && [ -z "$buildPhase" ]; then
     echo "Using pipBuildPhase"
     buildPhase=pipBuildPhase
 fi

pkgs/development/interpreters/python/hooks/pip-install-hook.sh

@@ -18,7 +18,7 @@ pipInstallPhase() {
     echo "Finished executing pipInstallPhase"
 }
 
-if [ -z "$dontUsePipInstall" ] && [ -z "$installPhase" ]; then
+if [ -z "${dontUsePipInstall-}" ] && [ -z "$installPhase" ]; then
     echo "Using pipInstallPhase"
     installPhase=pipInstallPhase
 fi

pkgs/development/interpreters/python/hooks/pytest-check-hook.sh

@@ -43,7 +43,7 @@ function pytestCheckPhase() {
     echo "Finished executing pytestCheckPhase"
 }
 
-if [ -z "$dontUsePytestCheck" ] && [ -z "$installCheckPhase" ]; then
+if [ -z "${dontUsePytestCheck-}" ] && [ -z "$installCheckPhase" ]; then
     echo "Using pytestCheckPhase"
     preDistPhases+=" pytestCheckPhase"
 fi

pkgs/development/interpreters/python/hooks/python-catch-conflicts-hook.sh

@@ -5,6 +5,6 @@ pythonCatchConflictsPhase() {
     @pythonInterpreter@ @catchConflicts@
 }
 
-if [ -z "$dontUsePythonCatchConflicts" ]; then
+if [ -z "${dontUsePythonCatchConflicts-}" ]; then
     preDistPhases+=" pythonCatchConflictsPhase"
 fi

pkgs/development/interpreters/python/hooks/python-imports-check-hook.sh

@@ -10,7 +10,7 @@ pythonImportsCheckPhase () {
     fi
 }
 
-if [ -z "$dontUsePythonImportsCheck" ]; then
+if [ -z "${dontUsePythonImportsCheck-}" ]; then
     echo "Using pythonImportsCheckPhase"
     preDistPhases+=" pythonImportsCheckPhase"
 fi

pkgs/development/interpreters/python/hooks/python-remove-bin-bytecode-hook.sh

@@ -12,6 +12,6 @@ pythonRemoveBinBytecodePhase () {
     fi
 }
 
-if [ -z "$dontUsePythonRemoveBinBytecode" ]; then
+if [ -z "${dontUsePythonRemoveBinBytecode-}" ]; then
     preDistPhases+=" pythonRemoveBinBytecodePhase"
 fi

pkgs/development/interpreters/python/hooks/setuptools-build-hook.sh

@@ -36,12 +36,12 @@ setuptoolsShellHook() {
     echo "Finished executing setuptoolsShellHook"
 }
 
-if [ -z "$dontUseSetuptoolsBuild" ] && [ -z "$buildPhase" ]; then
+if [ -z "${dontUseSetuptoolsBuild-}" ] && [ -z "$buildPhase" ]; then
     echo "Using setuptoolsBuildPhase"
     buildPhase=setuptoolsBuildPhase
 fi
 
-if [ -z "$dontUseSetuptoolsShellHook" ] && [ -z "$shellHook" ]; then
+if [ -z "${dontUseSetuptoolsShellHook-}" ] && [ -z "$shellHook" ]; then
     echo "Using setuptoolsShellHook"
     shellHook=setuptoolsShellHook
 fi

pkgs/development/interpreters/python/hooks/setuptools-check-hook.sh

@@ -12,7 +12,7 @@ setuptoolsCheckPhase() {
     echo "Finished executing setuptoolsCheckPhase"
 }
 
-if [ -z "$dontUseSetuptoolsCheck" ] && [ -z "$installCheckPhase" ]; then
+if [ -z "${dontUseSetuptoolsCheck-}" ] && [ -z "$installCheckPhase" ]; then
     echo "Using setuptoolsCheckPhase"
     preDistPhases+=" setuptoolsCheckPhase"
 fi

pkgs/development/interpreters/python/hooks/wheel-unpack-hook.sh

@@ -12,7 +12,7 @@ wheelUnpackPhase(){
     echo "Finished executing wheelUnpackPhase"
 }
 
-if [ -z "$dontUseWheelUnpack" ] && [ -z "$unpackPhase" ]; then
+if [ -z "${dontUseWheelUnpack-}" ] && [ -z "$unpackPhase" ]; then
     echo "Using wheelUnpackPhase"
     unpackPhase=wheelUnpackPhase
 fi

pkgs/development/libraries/qt-5/hooks/qmake-hook.sh

@@ -31,6 +31,6 @@ qmakeConfigurePhase() {
     runHook postConfigure
 }
 
-if [ -z "$dontUseQmakeConfigure" -a -z "$configurePhase" ]; then
+if [ -z "${dontUseQmakeConfigure-}" -a -z "$configurePhase" ]; then
     configurePhase=qmakeConfigurePhase
 fi

pkgs/development/libraries/qt-5/hooks/wrap-qt-apps-hook.sh

@@ -64,10 +64,10 @@ qtOwnPathsHook() {
 
 preFixupPhases+=" qtOwnPathsHook"
 
-# Note: $qtWrapperArgs still gets defined even if $dontWrapQtApps is set.
+# Note: $qtWrapperArgs still gets defined even if ${dontWrapQtApps-} is set.
 wrapQtAppsHook() {
     # skip this hook when requested
-    [ -z "$dontWrapQtApps" ] || return 0
+    [ -z "${dontWrapQtApps-}" ] || return 0
 
     # guard against running multiple times (e.g. due to propagation)
     [ -z "$wrapQtAppsHookHasRun" ] || return 0

pkgs/development/node-packages/node-env.nix

@@ -363,7 +363,7 @@ let
 
         npm ${forceOfflineFlag} --nodedir=${nodeSources} ${npmFlags} ${stdenv.lib.optionalString production "--production"} rebuild
 
-        if [ "$dontNpmInstall" != "1" ]
+        if [ "''${dontNpmInstall-}" != "1" ]
         then
             # NPM tries to download packages even when they already exist if npm-shrinkwrap is used.
             rm -f npm-shrinkwrap.json

pkgs/development/python-modules/pythonnet/default.nix

@@ -43,8 +43,8 @@ buildPythonPackage rec {
   '';
 
   preConfigure = ''
-    [ -z "$dontPlacateNuget" ] && placate-nuget.sh
+    [ -z "''${dontPlacateNuget-}" ] && placate-nuget.sh
-    [ -z "$dontPlacatePaket" ] && placate-paket.sh
+    [ -z "''${dontPlacatePaket-}" ] && placate-paket.sh
   '';
 
   nativeBuildInputs = [

pkgs/development/ruby-modules/gem/default.nix

@@ -99,7 +99,7 @@ stdenv.mkDerivation ((builtins.removeAttrs attrs ["source"]) // {
     runHook preUnpack
 
     if [[ -f $src && $src == *.gem ]]; then
-      if [[ -z "$dontBuild" ]]; then
+      if [[ -z "''${dontBuild-}" ]]; then
         # we won't know the name of the directory that RubyGems creates,
         # so we'll just use a glob to find it and move it over.
         gempkg="$src"

pkgs/development/tools/ocaml/opam/opam-shebangs.patch

@@ -64,7 +64,7 @@ index 00000000..3ea84e2d
 +header() { echo "$1"; }
 +stopNest() { true; }
 +
-+fixupOutputHooks+=('if [ -z "$dontPatchShebangs" -a -e "$prefix" ]; then patchShebangs "$prefix"; fi')
++fixupOutputHooks+=('if [ -z "${dontPatchShebangs-}" -a -e "$prefix" ]; then patchShebangs "$prefix"; fi')
 +
 +patchShebangs() {
 +    local dir="$1"

pkgs/os-specific/linux/kernel/manual-config.nix

@@ -179,7 +179,7 @@ let
       '' else "") + (if isModular then ''
         mkdir -p $dev
         cp vmlinux $dev/
-        if [ -z "$dontStrip" ]; then
+        if [ -z "''${dontStrip-}" ]; then
           installFlagsArray+=("INSTALL_MOD_STRIP=1")
         fi
         make modules_install $makeFlags "''${makeFlagsArray[@]}" \

pkgs/stdenv/cygwin/rebase-i686.sh

@@ -1,7 +1,7 @@
 fixupOutputHooks+=(_cygwinFixAutoImageBase)
 
 _cygwinFixAutoImageBase() {
-    if [ "$dontRebase" == 1 ] || [ ! -d "$prefix" ]; then
+    if [ "${dontRebase-}" == 1 ] || [ ! -d "$prefix" ]; then
         return
     fi
     find "$prefix" -name "*.dll" -type f | while read DLL; do

pkgs/stdenv/cygwin/rebase-x86_64.sh

@@ -1,7 +1,7 @@
 fixupOutputHooks+=(_cygwinFixAutoImageBase)
 
 _cygwinFixAutoImageBase() {
-    if [ "$dontRebase" == 1 ] || [ ! -d "$prefix" ]; then
+    if [ "${dontRebase-}" == 1 ] || [ ! -d "$prefix" ]; then
         return
     fi
     find "$prefix" -name "*.dll" -type f | while read DLL; do