gca_worktree.sh

#!/bin/bash

set -u

WORK_SRC_ROOT="/data/mysql-server"
WORK_MAIN_REPO="8.0"

readonly BRANCH=$1
readonly LOWEST_VERSION_ARG=$2

readonly DEFAULT_LOWEST_VERSION="5.6"

if [ "$LOWEST_VERSION_ARG" = "" ]; then
    echo "Creating branches starting at $DEFAULT_LOWEST_VERSION"
    LOWEST_VERSION="$DEFAULT_LOWEST_VERSION"
else
    LOWEST_VERSION="$LOWEST_VERSION_ARG"
fi

if [ "$LOWEST_VERSION" != "5.6" ] && [ "$LOWEST_VERSION" != "5.7" ]; then
    echo "Only 5.6 and 5.7 are valid lowest versions"
    exit 1
fi

function create_git_gca_worktree ()
{
    local lower_base_branch=$1
    local lower_branch=$2
    local higher_branch=$3

    local gca_rev
    gca_rev="$(git rev-list "$lower_base_branch" ^"$higher_branch" --first-parent --topo-order \
        | tail -1)^"

    echo "Creating $lower_branch from $lower_base_branch for merge to $higher_branch at $gca_rev"

    git worktree add -b "$lower_branch" "../$lower_branch" "$gca_rev"
}

pushd "$WORK_SRC_ROOT/$WORK_MAIN_REPO" || exit 1

git worktree add -b "$BRANCH-8.0" "../$BRANCH-8.0" percona/8.0
create_git_gca_worktree "percona/5.7" "$BRANCH-5.7" "$BRANCH-8.0"
if [ "$LOWEST_VERSION" = "5.6" ]; then
   create_git_gca_worktree "percona/5.6" "$BRANCH-5.6" "$BRANCH-5.7"
fi

popd || exit 0