mirror of https://gitee.com/openkylin/qemu.git
100 lines
2.8 KiB
Bash
100 lines
2.8 KiB
Bash
#!/usr/bin/env bash
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# -*- shell-script-mode -*-
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#
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# Helpers for NBD server related config
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#
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# Copyright (C) 2018 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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nbd_unix_socket="${SOCK_DIR}/qemu-nbd.sock"
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nbd_tcp_addr="127.0.0.1"
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nbd_pid_file="${TEST_DIR}/qemu-nbd.pid"
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nbd_stderr_fifo="${TEST_DIR}/qemu-nbd.fifo"
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# If bash version is >= 4.1, this will be overwritten by a dynamically
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# assigned file descriptor value.
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nbd_fifo_fd=10
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nbd_server_stop()
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{
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local NBD_PID
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if [ -f "$nbd_pid_file" ]; then
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read NBD_PID < "$nbd_pid_file"
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rm -f "$nbd_pid_file"
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if [ -n "$NBD_PID" ]; then
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kill "$NBD_PID"
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fi
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fi
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rm -f "$nbd_unix_socket" "$nbd_stderr_fifo"
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}
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nbd_server_start_unix_socket()
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{
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nbd_server_stop
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$QEMU_NBD -v -t -k "$nbd_unix_socket" --fork "$@"
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}
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nbd_server_start_tcp_socket()
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{
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nbd_server_stop
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mkfifo "$nbd_stderr_fifo"
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for ((port = 10809; port <= 10909; port++))
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do
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# Redirect stderr to FIFO, so we can later decide whether we
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# want to read it or to redirect it to our stderr, depending
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# on whether the command fails or not
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$QEMU_NBD -v -t -b $nbd_tcp_addr -p $port --fork "$@" \
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2> "$nbd_stderr_fifo" &
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# Taken from common.qemu
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if [[ "${BASH_VERSINFO[0]}" -ge "5" ||
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("${BASH_VERSINFO[0]}" -ge "4" && "${BASH_VERSINFO[1]}" -ge "1") ]]
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then
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exec {nbd_fifo_fd}<"$nbd_stderr_fifo"
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else
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let _nbd_fifo_fd++
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eval "exec ${_nbd_fifo_fd}<'$nbd_stderr_fifo'"
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fi
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wait $!
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if test $? == 0
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then
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# Success, redirect qemu-nbd's stderr to our stderr
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nbd_tcp_port=$port
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(cat <&$nbd_fifo_fd >&2) &
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eval "exec $nbd_fifo_fd>&-"
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return
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fi
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# Failure, read the output
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output=$(cat <&$nbd_fifo_fd)
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eval "exec $nbd_fifo_fd>&-"
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if ! echo "$output" | grep -q "Address already in use"
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then
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# Unknown error, print it
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echo "$output" >&2
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rm -f "$nbd_stderr_fifo"
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exit 1
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fi
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done
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echo "Cannot find free TCP port for nbd in range 10809-10909"
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rm -f "$nbd_stderr_fifo"
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exit 1
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}
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