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core_date: dumb little script so I can stop doing math

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Compute coreos version for a date or the date of a coreos version.
Arguments are passed to `date` except for `-v` which takes an optional
version value and converts it to a date. `-v` must be the first arg.

    $ ./core_date
    945
    $ ./core_date -d wed
    947
    $ ./core_date -v
    Fri Jan 29 00:00:00 UTC 2016
    $ ./core_date -v +%D
    01/29/16
    $ ./core_date -v 1000
    Sun Mar 27 00:00:00 UTC 2016
    $ ./core_date -v 1000 +%D
    03/27/16
This commit is contained in:
Michael Marineau 2016-02-01 14:33:10 -08:00
parent 143c7b312e
commit 867ccc06c6
1 changed files with 28 additions and 0 deletions
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28
core_date Executable file
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#!/bin/bash
# Copyright (c) 2016 The CoreOS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
SCRIPT_ROOT=$(dirname $(readlink -f "$0"))
. "${SCRIPT_ROOT}/common.sh" || exit 1
if [[ "$1" == "-v" ]]; then
shift
if [[ $# -ge 1 ]] && [[ "$1" != [-+]* ]]; then
v="$1"
shift
else
v="${COREOS_VERSION}"
fi
# strip of a v prefix or .0.0 suffix
v="${v#v}"
v="${v%%.*}"
export TZ=${TZ:=UTC}
date -d @$(( (v * 86400) + COREOS_EPOCH )) "$@"
else
t=$(date +%s "$@")
echo $(( (t - COREOS_EPOCH) / 86400 ))
fi