git clone https://android.googlesource.com/platform/packages/apps/Camera
cd Camera
git filter-branch --prune-empty --subdirectory-filter jni master
git filter-branch --force --index-filter 'git rm --cached --ignore-unmatch Android.mk' --prune-empty --tag-name-filter cat -- --all
# Go make some coffee

cd ..
git clone https://android.googlesource.com/platform/packages/apps/Camera2
cd Camera2
git filter-branch --prune-empty --subdirectory-filter jni master
git filter-branch --force --index-filter 'git rm --cached --ignore-unmatch Android.mk' --prune-empty --tag-name-filter cat -- --all
# Drink the coffee
git reset --hard 4f173e51f4fa3cb0bf4adc2a4a4a479a5af7a9fc

git pull --rebase ../Camera
git gc

cd ..

mkdir android-panorama
cd android-panorama
git init
touch .gitignore
git add .gitignore
git commit -m "Added .gitignore"

cd ../Camera2
git pull --rebase  ../android-panorama/
git for-each-ref --format='delete %(refname)' refs/original | git update-ref --stdin
git reflog expire --expire=now --all
git gc --prune=now