#!/bin/bash

# Copyright 2012 The Go Authors. All rights reserved.

# Use of this source code is governed by a BSD-style

# license that can be found in the LICENSE file.

# This script rebuilds the time zone files using files

# downloaded from the ICANN/IANA distribution.

#

# To prepare an update for a new Go release,

# consult https://www.iana.org/time-zones for the latest versions,

# update CODE and DATA below, and then run

#

# ./update.bash -commit

#

# That will prepare the files and create the commit.

#

# To review such a commit (as the reviewer), use:

#

# git codereview change NNNNNN # CL number

# cd lib/time

# ./update.bash

#

# If it prints "No updates needed.", then the generated files

# in the CL match the update.bash in the CL.

# Versions to use.

CODE=2024a

DATA=2024a

set -e

cd $(dirname $0)

rm -rf work

mkdir work

go build -o work/mkzip mkzip.go # build now for correct paths in build errors

cd work

mkdir zoneinfo

curl -sS -L -O https://www.iana.org/time-zones/repository/releases/tzcode$CODE.tar.gz

curl -sS -L -O https://www.iana.org/time-zones/repository/releases/tzdata$DATA.tar.gz

tar xzf tzcode$CODE.tar.gz

tar xzf tzdata$DATA.tar.gz

if ! make CFLAGS=-DSTD_INSPIRED AWK=awk TZDIR=zoneinfo posix_only >make.out 2>&1; then

cat make.out

exit 2

fi

cd zoneinfo

../mkzip ../../zoneinfo.zip

cd ../..

files="update.bash zoneinfo.zip"

modified=true

if git diff --quiet $files; then

modified=false

fi

if [ "$1" = "-work" ]; then

echo Left workspace behind in work/.

shift

else

rm -rf work

fi

if ! $modified; then

echo No updates needed.

exit 0

fi

echo Updated for $CODE/$DATA: $files

commitmsg="lib/time: update to $CODE/$DATA

Commit generated by update.bash.

For #22487.

"

if [ "$1" = "-commit" ]; then

echo "Creating commit. Run 'git reset HEAD^' to undo commit."

echo

git commit -m "$commitmsg" $files

echo

git log -n1 --stat

echo

fi