| #!/bin/bash |
| # Copyright 2019 The Fuchsia 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 extracts the time zone data revision (e.g. "2019c") from the given |
| # path to "zoneinfo64.res" and writes it to the given output path. |
| # |
| # Usage: |
| # ./extract_revision.sh <path/to/zoneinfo64.res> <path/to/output/file> |
| |
| # Fail fast |
| set -euo pipefail |
| |
| # Run `strings` on the file with 2-byte little-Endian chars. |
| # Search for a version string of the appropriate pattern, exit on failure. |
| # Examples: "2019c", "2023z" |
| count="0" |
| out=$(strings --encoding=l $1 | grep -E '^20[0-9][0-9][a-z]$') && |
| count=$(printf "%s" "$out" | wc -w) |
| |
| if [ "$count" = "1" ]; then |
| printf "%s" "$out" >$2 |
| else |
| # >&2 is stderr |
| echo "Expected exactly one version string in '$1'. Found $count." >&2 |
| exit -1 |
| fi |
