Go vendoring

#!/bin/sh
set -x
if [ "$1" == "" ]; then
  echo "Usage: $0 <REPO_PATH> [<PROJECT_ROOT>] [<branch>]"
  exit 1
fi


repo=$1

# Check if repo is relative
path=$(echo $repo | cut -d/ -f3)

if [ "$path" == "" ]; then 
   host="github.com"
   path=$repo
else
   host=$(echo $repo | cut -d/ -f1)
   path=$(echo $repo | cut -d/ -f2,3)
fi

project_root=$2
if [ "$project_root" == "" ]; then
   project_root=`pwd`
   echo "Set project root to cwd: ${project_root}"
fi

git_dir="$project_root/.git"
if ! [ -d $git_dir ]; then
    echo "$project_root is not a Git repo: $git_dir not found."
    exit 1
fi

branch=$3
if [ "$branch" == "" ]; then
   branch=master
fi

cd $project_root
git submodule add --force https://$host/${path}.git vendor/$host/$path
cd vendor/$host/$path
git checkout $branch
cd -
git add vendor/$host/$path
git commit -m "Added $host/$repo"
git submodule update --init -f