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#!/usr/bin/env bash
# -*- shell-script-mode -*-
#
# Helpers for NBD server related config
#
# Copyright (C) 2018 Red Hat, 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 2 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 <http://www.gnu.org/licenses/>.
#
nbd_unix_socket="${TEST_DIR}/qemu-nbd.sock"
nbd_tcp_addr="127.0.0.1"
nbd_pid_file="${TEST_DIR}/qemu-nbd.pid"
nbd_stderr_fifo="${TEST_DIR}/qemu-nbd.fifo"
# If bash version is >= 4.1, this will be overwritten by a dynamically
# assigned file descriptor value.
nbd_fifo_fd=10
nbd_server_stop()
{
local NBD_PID
if [ -f "$nbd_pid_file" ]; then
read NBD_PID < "$nbd_pid_file"
rm -f "$nbd_pid_file"
if [ -n "$NBD_PID" ]; then
kill "$NBD_PID"
fi
fi
rm -f "$nbd_unix_socket" "$nbd_stderr_fifo"
}
nbd_server_start_unix_socket()
{
nbd_server_stop
$QEMU_NBD -v -t -k "$nbd_unix_socket" --fork "$@"
}
nbd_server_start_tcp_socket()
{
nbd_server_stop
mkfifo "$nbd_stderr_fifo"
for ((port = 10809; port <= 10909; port++))
do
# Redirect stderr to FIFO, so we can later decide whether we
# want to read it or to redirect it to our stderr, depending
# on whether the command fails or not
$QEMU_NBD -v -t -b $nbd_tcp_addr -p $port --fork "$@" \
2> "$nbd_stderr_fifo" &
# Taken from common.qemu
if [[ "${BASH_VERSINFO[0]}" -ge "5" ||
("${BASH_VERSINFO[0]}" -ge "4" && "${BASH_VERSINFO[1]}" -ge "1") ]]
then
exec {nbd_fifo_fd}<"$nbd_stderr_fifo"
else
let _nbd_fifo_fd++
eval "exec ${_nbd_fifo_fd}<'$nbd_stderr_fifo'"
fi
wait $!
if test $? == 0
then
# Success, redirect qemu-nbd's stderr to our stderr
nbd_tcp_port=$port
(cat <&$nbd_fifo_fd >&2) &
eval "exec $nbd_fifo_fd>&-"
return
fi
# Failure, read the output
output=$(cat <&$nbd_fifo_fd)
eval "exec $nbd_fifo_fd>&-"
if ! echo "$output" | grep -q "Address already in use"
then
# Unknown error, print it
echo "$output" >&2
rm -f "$nbd_stderr_fifo"
exit 1
fi
done
echo "Cannot find free TCP port for nbd in range 10809-10909"
rm -f "$nbd_stderr_fifo"
exit 1
}
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