Fixup iOS apps to run on visionOS sim

fixup.sh

#!/bin/zsh
PWD=$(pwd)

app_path=$1
app_basename="${app_path%.*}"

if [ "$#" -ne 1 ]; then
    echo "Usage: ./fixup.sh YourApp.app"
    exit -1
fi

function fixup_build_ver ()
{
    which_dylib=$1
    vtool_src=$1
    vtool_dst=$1
    parentpath="$(dirname "$which_dylib")"

    vtool -remove-build-version macos -output $vtool_dst $vtool_src &> /dev/null
    vtool -remove-build-version ios -output $vtool_dst $vtool_src &> /dev/null
    vtool -remove-build-version xrossim -output $vtool_dst $vtool_src &> /dev/null
    vtool -remove-build-version iossim -output $vtool_dst $vtool_src &> /dev/null
    #vtool -set-build-version xrossim 1.0 1.0 -tool ld 902.11 -output $vtool_dst $vtool_dst &> /dev/null
    vtool -set-build-version iossim 14.0 16.2 -tool ld 820.1 -output $vtool_dst $vtool_dst &> /dev/null

    plutil -replace UIDeviceFamily -json '[1,2]' $parentpath/Info.plist
    plutil -replace CFBundleSupportedPlatforms -json '["XRSimulator"]' $parentpath/Info.plist
    plutil -replace MinimumOSVersion -json '1.0' $parentpath/Info.plist
    plutil -replace DTSDKName -json '"xrsimulator1.0.internal"' $parentpath/Info.plist
    plutil -replace DTPlatformName -json '"xrsimulator"' $parentpath/Info.plist
    plutil -replace DTPlatformVersion -json '1.0' $parentpath/Info.plist

    codesign -s - $1 --force --deep &> /dev/null
}

function trim() {
    local var="$*"
    # remove leading whitespace characters
    var="${var#"${var%%[![:space:]]*}"}"
    # remove trailing whitespace characters
    var="${var%"${var##*[![:space:]]}"}"
    printf '%s' "$var"
}

fixup_build_ver_recursive() {
 for i in "$1"/*;do
    if [ -d "$i" ];then
        #echo "dir: $i"
        fixup_build_ver_recursive "$i"
    elif [ -f "$i" ]; then
        macho_hdr_1="cffaedfe" # normal
        macho_hdr_2="cafebabe" # fat

        hdr=$(head -c 4 $i | hexdump -e '16/1 "%02x" "\n"')
        hdr=$(trim $hdr)
        #echo $i $hdr $macho_hdr_1
        if [[ "$hdr" = "$macho_hdr_1" || "$hdr" = "$macho_hdr_2" ]]; then
          echo Fixed "$i"
          fixup_build_ver $PWD/$i
        fi

        
    fi
 done
}

#fixup_build_ver $app_path/$app_basename

rm -rf $app_path/PlugIns

echo "Fixing build versions for \`$app_path\`..."
fixup_build_ver_recursive $app_path

mkdir -p $app_path/PlugIns

echo "Signing \`$app_path\`"
codesign -s - $PWD/$app_path --force --deep --verbose

echo "Installing \`$app_path\`"
xcrun simctl install booted $app_path

Thanks for publishing this! I kept running into an issue with this script in fixup_build_ver_recursive() that would cause it to fail if it encountered an empty directory. I got around this by replacing the i in "$1"/* loop with find:

fixup_build_ver_recursive() {
 find "$1" -type f -print0 | while IFS= read -r -d '' i; do
    macho_hdr_1="cffaedfe" # normal
    macho_hdr_2="cafebabe" # fat

    hdr=$(head -c 4 "$i" | hexdump -e '16/1 "%02x" "\n"')
    hdr=$(trim "$hdr")
    if [[ "$hdr" = "$macho_hdr_1" || "$hdr" = "$macho_hdr_2" ]]; then
      echo Fixed "$i"
      fixup_build_ver "$PWD/$i"
    fi
 done
}

I'm not a script expert though, I'm not sure if this would create any other problems.