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#!/bin/bash
# This script provides a fallback for systems where `timedatectl show
# -p Timezone --value` does not work
set -eu
if timezone="$(timedatectl show -p Timezone --value 2>/dev/null)"; then
echo "${timezone}"
exit 0
fi
read_abs_symlink() {
local target
local fromdir
target=$(readlink "${1}")
case "${target}" in
/*)
echo "${target}"
;;
*)
fromdir=$(dirname "${1}")
realpath "${fromdir}/${target}"
;;
esac
}
read_localtime() {
local target
if ! [ -L "${1}" ]; then
echo "${1} is not a symlink" 1>&2
exit 1
fi
target="$(read_abs_symlink "${1}")"
case "${target}" in
/usr/share/zoneinfo/*)
echo "${target#/usr/share/zoneinfo/}"
;;
*)
read_localtime "${target}"
;;
esac
}
if [ -L /etc/localtime ]; then
read_localtime /etc/localtime
elif [ -f /etc/timezone ]; then
# Initial /etc/localtime from postinst on old Debian/Ubuntu copies
# /etc/localtime instead of linking. Trying to recover the
# timezone from /etc/timezone.
cat /etc/timezone
fi
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