| 1 | #!/usr/bin/env bash |
| 2 | # -*- shell-script-mode -*- |
| 3 | # |
| 4 | # Helpers for NBD server related config |
| 5 | # |
| 6 | # Copyright (C) 2018 Red Hat, Inc. |
| 7 | # |
| 8 | # This program is free software; you can redistribute it and/or modify |
| 9 | # it under the terms of the GNU General Public License as published by |
| 10 | # the Free Software Foundation; either version 2 of the License, or |
| 11 | # (at your option) any later version. |
| 12 | # |
| 13 | # This program is distributed in the hope that it will be useful, |
| 14 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | # GNU General Public License for more details. |
| 17 | # |
| 18 | # You should have received a copy of the GNU General Public License |
| 19 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | # |
| 21 | |
| 22 | nbd_unix_socket="${SOCK_DIR}/qemu-nbd.sock" |
| 23 | nbd_tcp_addr="127.0.0.1" |
| 24 | nbd_pid_file="${TEST_DIR}/qemu-nbd.pid" |
| 25 | nbd_stderr_fifo="${TEST_DIR}/qemu-nbd.fifo" |
| 26 | |
| 27 | # If bash version is >= 4.1, this will be overwritten by a dynamically |
| 28 | # assigned file descriptor value. |
| 29 | nbd_fifo_fd=10 |
| 30 | |
| 31 | nbd_server_stop() |
| 32 | { |
| 33 | local NBD_PID |
| 34 | if [ -f "$nbd_pid_file" ]; then |
| 35 | read NBD_PID < "$nbd_pid_file" |
| 36 | rm -f "$nbd_pid_file" |
| 37 | if [ -n "$NBD_PID" ]; then |
| 38 | kill "$NBD_PID" |
| 39 | fi |
| 40 | fi |
| 41 | rm -f "$nbd_unix_socket" "$nbd_stderr_fifo" |
| 42 | } |
| 43 | |
| 44 | nbd_server_start_unix_socket() |
| 45 | { |
| 46 | nbd_server_stop |
| 47 | $QEMU_NBD -v -t -k "$nbd_unix_socket" --fork "$@" |
| 48 | } |
| 49 | |
| 50 | nbd_server_start_tcp_socket() |
| 51 | { |
| 52 | nbd_server_stop |
| 53 | |
| 54 | mkfifo "$nbd_stderr_fifo" |
| 55 | for ((port = 10809; port <= 10909; port++)) |
| 56 | do |
| 57 | # Redirect stderr to FIFO, so we can later decide whether we |
| 58 | # want to read it or to redirect it to our stderr, depending |
| 59 | # on whether the command fails or not |
| 60 | $QEMU_NBD -v -t -b $nbd_tcp_addr -p $port --fork "$@" \ |
| 61 | 2> "$nbd_stderr_fifo" & |
| 62 | |
| 63 | # Taken from common.qemu |
| 64 | if [[ "${BASH_VERSINFO[0]}" -ge "5" || |
| 65 | ("${BASH_VERSINFO[0]}" -ge "4" && "${BASH_VERSINFO[1]}" -ge "1") ]] |
| 66 | then |
| 67 | exec {nbd_fifo_fd}<"$nbd_stderr_fifo" |
| 68 | else |
| 69 | let _nbd_fifo_fd++ |
| 70 | eval "exec ${_nbd_fifo_fd}<'$nbd_stderr_fifo'" |
| 71 | fi |
| 72 | wait $! |
| 73 | |
| 74 | if test $? == 0 |
| 75 | then |
| 76 | # Success, redirect qemu-nbd's stderr to our stderr |
| 77 | nbd_tcp_port=$port |
| 78 | (cat <&$nbd_fifo_fd >&2) & |
| 79 | eval "exec $nbd_fifo_fd>&-" |
| 80 | return |
| 81 | fi |
| 82 | |
| 83 | # Failure, read the output |
| 84 | output=$(cat <&$nbd_fifo_fd) |
| 85 | eval "exec $nbd_fifo_fd>&-" |
| 86 | |
| 87 | if ! echo "$output" | grep -q "Address already in use" |
| 88 | then |
| 89 | # Unknown error, print it |
| 90 | echo "$output" >&2 |
| 91 | rm -f "$nbd_stderr_fifo" |
| 92 | exit 1 |
| 93 | fi |
| 94 | done |
| 95 | |
| 96 | echo "Cannot find free TCP port for nbd in range 10809-10909" |
| 97 | rm -f "$nbd_stderr_fifo" |
| 98 | exit 1 |
| 99 | } |