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

gappsWrapperArgs=()

find_gio_modules() {
    if [ -d "$1"/lib/gio/modules ] && [ -n "$(ls -A $1/lib/gio/modules)" ] ; then
        gappsWrapperArgs+=(--prefix GIO_EXTRA_MODULES : "$1/lib/gio/modules")
    fi
}

addEnvHooks "$targetOffset" find_gio_modules

wrapGApp() {
    local program="$1"
    shift 1
    wrapProgram "$program" "${gappsWrapperArgs[@]}" "$@"
}

# 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
  wrapGAppsHookHasRun=1

  if [ -n "$GDK_PIXBUF_MODULE_FILE" ]; then
    gappsWrapperArgs+=(--set GDK_PIXBUF_MODULE_FILE "$GDK_PIXBUF_MODULE_FILE")
  fi

  if [ -n "$XDG_ICON_DIRS" ]; then
    gappsWrapperArgs+=(--prefix XDG_DATA_DIRS : "$XDG_ICON_DIRS")
  fi

  if [ -n "$GSETTINGS_SCHEMAS_PATH" ]; then
    gappsWrapperArgs+=(--prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH")
  fi

  if [ -d "$prefix/share" ]; then
    gappsWrapperArgs+=(--prefix XDG_DATA_DIRS : "$prefix/share")
  fi

  if [ -d "$prefix/lib/gio/modules" ] && [ -n "$(ls -A $prefix/lib/gio/modules)" ] ; then
    gappsWrapperArgs+=(--prefix GIO_EXTRA_MODULES : "$prefix/lib/gio/modules")
  fi

  for v in $wrapPrefixVariables GST_PLUGIN_SYSTEM_PATH_1_0 GI_TYPELIB_PATH GRL_PLUGIN_PATH; do
    eval local dummy="\$$v"
    gappsWrapperArgs+=(--prefix $v : "$dummy")
  done

  if [[ -z "$dontWrapGApps" ]]; then
    targetDirsThatExist=()
    targetDirsRealPath=()

    # wrap binaries
    targetDirs=( "${prefix}/bin" "${prefix}/libexec" )
    for targetDir in "${targetDirs[@]}"; do
      if [[ -d "${targetDir}" ]]; then
        targetDirsThatExist+=("${targetDir}")
        targetDirsRealPath+=("$(realpath "${targetDir}")/")
        find "${targetDir}" -type f -executable -print0 \
          | while IFS= read -r -d '' file; do
          echo "Wrapping program '${file}'"
          wrapGApp "${file}"
        done
      fi
    done

    # wrap links to binaries that point outside targetDirs
    # Note: links to binaries within targetDirs do not need
    #       to be wrapped as the binaries have already been wrapped
    if [[ ${#targetDirsThatExist[@]} -ne 0 ]]; then
      find "${targetDirsThatExist[@]}" -type l -xtype f -executable -print0 \
        | while IFS= read -r -d '' linkPath; do
        linkPathReal=$(realpath "${linkPath}")
        for targetPath in "${targetDirsRealPath[@]}"; do
          if [[ "$linkPathReal" == "$targetPath"* ]]; then
            echo "Not wrapping link: '$linkPath' (already wrapped)"
            continue 2
          fi
        done
        echo "Wrapping link: '$linkPath'"
        wrapGApp "${linkPath}"
      done
    fi
  fi
}

fixupOutputHooks+=(wrapGAppsHook)