#!/bin/sh

set -o errexit

set -o nounset

REPO='https://gn.googlesource.com/gn'

# Validate the argument

COMMIT=''

if [ "$#" = '1' ]

then

  if echo "$1" | grep -E '^[[:xdigit:]]{40}$' >/dev/null

  then

    COMMIT="$1"

  fi

elif [ "$#" = '0' ]

then

  COMMIT='main'

fi

if [ -z "${COMMIT}" ]

then

  cat 1>&2 <

Usage: $0 [COMMIT]

Parameters:

  COMMIT - full commit hash from upstream git (${REPO});

           otherwise the latest commit in main is used

EOF

  exit 1

fi

# Generate the version header

SRCDIR="$(cd "$(dirname "$0")"; pwd)"

SPEC="${SRCDIR}/gn.spec"

SPEC_COMMIT="$(

  awk '/^%global[[:blank:]]+commit[[:blank:]]+[[:xdigit:]]{40}[[:blank:]]*$/ {

    print $3; exit

  }' "${SPEC}"

)"

check_equal_commits() {

  if [ "${1}" = "${SPEC_COMMIT}" ]

  then

    cat 1>&2 <

Spec file is already up to date at ${SPEC_COMMIT}.

EOF

    exit

  fi

}

if echo "${COMMIT}" | grep -E '^[[:xdigit:]]{40}$' >/dev/null

then

  check_equal_commits "${COMMIT}"

fi

tmpd="$(mktemp -d)"

trap "rm -rf '${tmpd}'" INT TERM EXIT

cd "${tmpd}"

git clone 'https://gn.googlesource.com/gn'

cd gn

if ! echo "${COMMIT}" | grep -E '^[[:xdigit:]]{40}$' >/dev/null

then

  COMMIT="$(git rev-parse "${COMMIT}")"

  check_equal_commits "${COMMIT}"

fi

git checkout "${COMMIT}"

python3 './build/gen.py'

cp -vp './out/last_commit_position.h' "${SRCDIR}/"

cd "${SRCDIR}"

# Modify the spec file

POSITION="$(

  awk '

    $1 == "#define" && $2 == "LAST_COMMIT_POSITION_NUM" {

      print $3; exit

    }' 'last_commit_position.h'

)"

sed -r -i \

    -e 's/(%global[[:blank:]]+commit[[:blank:]]+)[[:xdigit:]]{40}[[:blank:]]*$/\1'"${COMMIT}/" \

    -e 's/(%global[[:blank:]]+access[[:blank:]]+)[[:digit:]]{8}[[:blank:]]*$/\1'"$(

      date -u '+%Y%m%d'

    )/" \

    -e 's/(Version:[[:blank:]]+)[[:digit:]]+[[:blank:]]*$/\1'"${POSITION}/" \

    "${SPEC}"

# Download the new tarball

spectool --get-files --directory "${SRCDIR}" "${SPEC}"

# Update the local git repo and upload the new source tarball

fedpkg new-sources "$(

  spectool --list-files "${SPEC}" |

    grep -E '^Source0:' |

    sed -r 's|.*/||'

)"

fedpkg commit -m "Update to version ${POSITION}"

git add 'last_commit_position.h' gn.spec

#  vim: tw=78 ts=2 sw=2 sts=2 et ai nojs