For those of you who’ve run into the Xcode 8 / Swift migrator hanging issue, this script fixes it. It marks all targets in the project as migrated. For any targets that haven’t actually been migrated to Swift 2.3/3, the script outputs a one-liner that you can cut-and-paste to undo individual targets.

force_migration.sh

#!/bin/bash

PROJ=$1
if [[ -z "$PROJ" ]]; then
    echo "Please provide a path to an Xcode project file."
    exit 1
fi

ROOT=$(/usr/libexec/PlistBuddy -c "Print rootObject" $PROJ)

/usr/libexec/PlistBuddy -c "Add objects:$ROOT:attributes:TargetAttributes dict" $PROJ > /dev/null 2>&1
/usr/libexec/PlistBuddy -c "Print objects:$ROOT:targets" $PROJ | tail -n +2 | head -n -1 | tr -d ' ' | while read IDENTIFIER; do
    TARGET_NAME=$(/usr/libexec/PlistBuddy -c "Print objects:$IDENTIFIER:name" $PROJ)
    echo "$IDENTIFIER $TARGET_NAME"
    /usr/libexec/PlistBuddy -c "Add objects:$ROOT:attributes:TargetAttributes:$IDENTIFIER dict" $PROJ > /dev/null 2>&1
    /usr/libexec/PlistBuddy -c "Add objects:$ROOT:attributes:TargetAttributes:$IDENTIFIER:LastSwiftMigration string" $PROJ > /dev/null 2>&1
    /usr/libexec/PlistBuddy -c "Set objects:$ROOT:attributes:TargetAttributes:$IDENTIFIER:LastSwiftMigration '0800'" $PROJ > /dev/null 2>&1
done

echo ""
echo "If any of the above targets should *not* have been marked as migrated, run the following."
echo ""
echo "    /usr/libexec/PlistBuddy -c \"Delete objects:$ROOT:attributes:TargetAttributes:\$IDENTIFIER\" $PROJ"
echo "    (and replace \$IDENTIFIER with the target identifier printed above)"