backport-prs

#!/bin/bash

# Backport JF PRs to release branch

org="jellyfin"

if [[ ! -f ~/.config/gh/hosts.yml || ! -f ~/.config/hub ]]; then
    # Remove any existing gh configs
    rm -r ~/.config/gh
    # Copy the gh/hub configs from Joshua (which uses Jellyfin Bot acct)
    sudo cp -a /var/home/joshua/.config/{hub,gh} ~/.config/
    sudo chown -R $USER ~/.config/
fi

echo "Please select the repo you want to work on:"
echo -e "  jellyfin"
echo -e "  jellyfin-web"
echo -n "> "
read repo
if [[ ${repo} != 'jellyfin' && ${repo} != 'jellyfin-web' ]]; then
    echo "Invalid repo!"
    exit 1
fi

pushd projects/server/${repo}

# Ensure we're in group mode and fix perms
sudo -u build git config core.sharedRepository group
sudo chgrp -R build .
sudo chmod -R g+rwX .
sudo find . -type d -exec chmod g+s '{}' +

upstream_repo="${org}/${repo}"
remote="$( grep -w --color=none "${upstream_repo}" <<<"$( git remote -v )" | grep 'fetch' | awk '{ print $1 }' )"
echo "Project remote: ${remote}"

current_branch="$( git branch | grep '^*' | awk '{ print $NF }' )"
echo "Current branch: ${current_branch}"

echo "Please select the release branch you want to apply backports from:"
git branch | grep --color=none 'release-'
echo -n "> "
read release_branch
if ! grep -qwo "${release_branch}" <<<"$( git branch )"; then
    echo "Invalid branch!"
    exit 1
fi

echo "Please enter the release project name (e.g. 'Release 10.7.0')"
echo -n "> "
read gh_project

### REAL MEAT ###

echo "Synchronizing local repository with remote release branch"
git checkout ${release_branch}
git fetch --all
git reset --hard
git rebase ${remote}/${release_branch}
if [[ $? -ne 0 ]]; then
    echo "Failed to rebase current master onto working directory! Stash or revert changes."
    exit 1
fi

echo "Synchronizing local repository with remote master"
git checkout master
git fetch --all
git reset --hard
git rebase ${remote}/master
if [[ $? -ne 0 ]]; then
    echo "Failed to rebase current master onto working directory! Stash or revert changes."
    exit 1
fi

git checkout ${release_branch}

# Get all the stable-backport PRs
backport_pr_list="$( gh pr list --limit 999 --state merged --label "stable backport" 2>/dev/null | sort -n | awk '{ print $1 }' | tr -d '#' )"
backport_merges=()

echo "We will backport the following $( wc -w <<<"${backport_pr_list}" ) PRs from the branch ${release_branch} to master:"
echo "$( tr '\n' ' ' <<<"${backport_pr_list}" )"
echo
echo -n "Press <Enter> to continue. "
read
echo

git checkout master

for pr in ${backport_pr_list}; do
    merge_commit="$( hub pr show -f '%sm' ${pr} 2>/dev/null )"
    merge_title="$( hub pr show -f '%t' ${pr} 2>/dev/null )"
    merge_author="$( git show -s --format='%an <%ae>' ${merge_commit}^2 )"
    merge_committer="$( git show -s --format='%an <%ae>' ${merge_commit} )"
    merge_backporter="$( git config --global user.name ) <$( git config --global user.email )>"
    echo "Parsing ${merge_commit} for ${pr}..."
    git cherry-pick -sxn -m1 ${merge_commit}
    if [[ $? -ne 0 ]]; then
        echo "Issue with merge! Review the changes in another terminal, run 'git add', then press <Enter>."
        read
    fi
    git commit -m "Backport pull request #${pr} from jellyfin/${release_branch}" --author="${merge_author}" -m "${merge_title}" -m "Original-merge: ${merge_commit}" -m "Merged-by: ${merge_committer}" -m "Backported-by: ${merge_backporter}"
done

echo
echo "Make sure everything is OK, then press <Enter> to push changes, remove labels, and update projects."
read

git push -u ${remote}

export gh_project
gh_project_id="$( gh api -XGET -H'Accept:application/vnd.github.inertia-preview+json' "orgs/${org}/projects" 2>/dev/null | jq '.[] | select(.name==env.gh_project) | .id' )"
gh_project_completed_column_id="$( gh api -XGET -H'Accept:application/vnd.github.inertia-preview+json' "projects/${gh_project_id}/columns" 2>/dev/null | jq '.[] | select(.name=="Completed PRs") | .id' )"
gh_project_jellyfinished_column_id="$( gh api -XGET -H'Accept:application/vnd.github.inertia-preview+json' "projects/${gh_project_id}/columns" 2>/dev/null | jq '.[] | select(.name=="Jellyfinished") | .id' )"
for pr in ${backport_pr_list}; do
    echo "Moving project card for PR ${pr}..."
    export pr_url="https://api.github.com/repos/${org}/${repo}/issues/${pr}"
    gh_project_card_id="$( gh api -XGET -H'Accept:application/vnd.github.inertia-preview+json' "projects/columns/${gh_project_completed_column_id}/cards" 2>/dev/null | jq '.[] | select(.content_url==env.pr_url) | .id' )"
    gh api -XPOST -H'Accept:application/vnd.github.inertia-preview+json' /projects/columns/cards/${gh_project_card_id}/moves --field column_id=${gh_project_jellyfinished_column_id} --field position=bottom 2>/dev/null
    echo "Removing backport label for PR ${pr}..."
    gh api -XDELETE "repos/${org}/${repo}/issues/${pr}/labels/stable%20backport" 2>/dev/null
done

sudo chown -R build:build .

popd

exit 0