./scripts/upstream.sh checkout

# Find candidate patch files by touched file path or unique hunk text
rg -n "path/to/file|unique_symbol" patches/*.patch

# Optional: inspect candidate patch header/hunks
sed -n '1,120p' patches/00NN-Example.patch

# Map patch file to commit in upstream checkout branch
patch=patches/00NN-Example.patch
subject=$(sed -n 's/^Subject: \[PATCH\] //p' "$patch" | head -n1)
cd upstream
git log --oneline pulumi/patch-checkout --grep "$subject"

# If needed, disambiguate by touched path
git log --oneline pulumi/patch-checkout -- path/to/file
cd ..

./scripts/upstream.sh checkout
cd upstream

target_sha=<owning-commit-sha>
base_sha=$(git rev-parse "${target_sha}^")
tmp_branch="rewrite-${target_sha:0:8}"

# Rebuild history from parent of target commit
git checkout -b "$tmp_branch" "$base_sha"
git cherry-pick "$target_sha"

# Apply fix and amend target commit
# ...edit files...
git add <files>
git commit --amend --no-edit

# Replay remaining commits
git cherry-pick "${target_sha}..pulumi/patch-checkout"

# If cherry-pick conflicts occur:
#   resolve files
#   git add <resolved files>
#   git cherry-pick --continue

# Move checkout branch to rewritten history
git branch -f pulumi/patch-checkout HEAD
git checkout pulumi/patch-checkout
git branch -D "$tmp_branch"
cd ..

./scripts/upstream.sh checkout
./scripts/upstream.sh rebase -i
# mark target commit as edit, amend, then continue

rm patches/00NN-Description.patch
./scripts/upstream.sh checkout
./scripts/upstream.sh check_in

cd upstream
# Restore specific docs-only files from parent of amended commit
git checkout HEAD^ -- path/to/docs-only-file path/to/another-doc-file
git add path/to/docs-only-file path/to/another-doc-file
git commit --amend --no-edit
cd ..

./scripts/upstream.sh checkout
cd upstream
# ...make changes...
git add <files>
git commit -m "Describe new patch"
cd ..
./scripts/upstream.sh check_in

./scripts/upstream.sh checkout

# Rebase onto the new upstream commit
./scripts/upstream.sh rebase -o <new_commit_sha>
# Resolve any conflicts that arise

# Write updated patch files
./scripts/upstream.sh check_in