drawing-common-migration-script

#!/usr/bin/env bash

# Match hidden files with the asterisk
shopt -s dotglob

source="${BASH_SOURCE[0]}"

# resolve $source until the file is no longer a symlink
while [[ -h "$source" ]]; do
  scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
  source="$(readlink "$source")"
  # if $source was a relative symlink, we need to resolve it relative to the path where the
  # symlink file was located
  [[ $source != /* ]] && source="$scriptroot/$source"
done
scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"

git clone https://github.com/dotnet/runtime
git clone https://github.com/dotnet/winforms

echo "Setting up git user: dotnet-bot (dotnet-bot@microsoft.com)"
git config --global user.email "dotnet-bot@microsoft.com"
git config --global user.name "dotnet-bot"

cd runtime
git remote rm origin

echo "Rewriting commits..."
git filter-branch --subdirectory-filter "src/libraries/System.Drawing.Common/" --prune-empty --force --msg-filter '
sed -r "s/(#[0-9]+)/dotnet\/runtime\1/g" |
sed -r "s/\b([a-f0-9]{40})\b/dotnet\/runtime@\1/g" |
cat && echo "\n\nCommit migrated from https://github.com/dotnet/runtime/commit/$GIT_COMMIT"
' --index-filter '
git ls-files -sz |
perl -0pe "s{\t}{\tsrc/System.Drawing.Common/}" |
GIT_INDEX_FILE=$GIT_INDEX_FILE.new \
    git update-index --clear -z --index-info &&
    mv "$GIT_INDEX_FILE.new" "$GIT_INDEX_FILE"' HEAD

echo "Cleaning repository..."
git reset --hard
git gc --aggressive 
git prune
git clean -fd

cd ../winforms

echo "Copying git objects into target repository..."
git remote add "runtime" "../runtime/"
git pull -n --no-edit --no-rebase --allow-unrelated-histories "runtime" main
git remote rm "runtime"

echo "Deleting runtime repository..."
rm -rf ../runtime

echo "Applying System.Drawing.Common patch"
git apply ../drawing.patch

echo "Pushing changes..."
git checkout -b DrawingMigration
sleep 5
git push