Shell Programming and Scripting

local -r gopath=${2:-${GOPATH%:*}}

while read path rev 
do
    rev=$(echo "${rev}" | sed "s/['\"]//g") # remove quotes which are around revs sometimes

    if [[ "${rev}" == "${old_rev}" ]] && [[ "${path}" == "${root}"* ]]; then
      # avoid checking the same git/hg root again
      continue
    fi

    root="${path}"
    while [ "${root}" != "." -a ! -d "${gopath}/src/${root}/.git" -a ! -d "${gopath}/src/${root}/.hg" ] 
do
      root=$(dirname "${root}")
    done
    if [ "${root}" == "." ]; then
      echo "No checkout of ${path} found in GOPATH \"${gopath}\"." 1>&2
      return 1
    fi
    local head
    if [ -d "${gopath}/src/${root}/.git" ]; then
      head="$(cd "${gopath}/src/${root}" && git rev-parse HEAD)"
    else
      head="$(cd "${gopath}/src/${root}" && hg parent --template '{node}')"
    fi
    if [ "${head}" != "${rev}" ]; then
      echo "Unexpected HEAD '${head}' at ${gopath}/src/${root}, expected '${rev}'." 1>&2
      return 1
    fi
    old_rev="${rev}"
  done < <(jq '.Deps|.[]|.ImportPath + " " + .Rev' -r < "${godeps_json}")