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#!/bin/sh
# Ensure that tail seeks to the end of a device
# Copyright (C) 2017-2021 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ tail
# need write access to local device
# (even though we don't actually write anything)
require_root_
require_local_dir_
get_device_size() {
BLOCKDEV=blockdev
$BLOCKDEV -V >/dev/null 2>&1 || BLOCKDEV=/sbin/blockdev
$BLOCKDEV --getsize64 "$1"
}
# Get path to device the current dir is on.
# Note df can only get fs size, not device size.
device=$(df --output=source . | tail -n1) || framework_failure_
dev_size=$(get_device_size "$device") ||
skip_ "failed to determine size of $device"
tail_offset=$(expr $dev_size - 1023) ||
skip_ "failed to determine tail offset"
timeout 10 tail -c 1024 "$device" > end1 || fail=1
timeout 10 tail -c +"$tail_offset" "$device" > end2 || fail=1
test $(wc -c < end1) = 1024 || fail=1
cmp end1 end2 || fail=1
Exit $fail
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