1 files changed, 87 insertions, 0 deletions
diff --git a/lib/time/update.bash b/lib/time/update.bash
new file mode 100755
index 0000000..48606b9
--- /dev/null
+++ b/lib/time/update.bash
@@ -0,0 +1,87 @@
+#!/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=2022g
+DATA=2022g
+
+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 ../..
+go generate time/tzdata
+
+files="update.bash zoneinfo.zip ../../src/time/tzdata/zipdata.go"
+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