tests/qemu-iotests/common.qemu

   1 #!/bin/bash
   2 #
   3 # This allows for launching of multiple QEMU instances, with independent
   4 # communication possible to each instance.
   5 #
   6 # Each instance can choose, at launch, to use either the QMP or the
   7 # HMP (monitor) interface.
   8 #
   9 # All instances are cleaned up via _cleanup_qemu, including killing the
  10 # running qemu instance.
  11 #
  12 # Copyright (C) 2014 Red Hat, Inc.
  13 #
  14 # This program is free software; you can redistribute it and/or modify
  15 # it under the terms of the GNU General Public License as published by
  16 # the Free Software Foundation; either version 2 of the License, or
  17 # (at your option) any later version.
  18 #
  19 # This program is distributed in the hope that it will be useful,
  20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 # GNU General Public License for more details.
  23 #
  24 # You should have received a copy of the GNU General Public License
  25 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26 #
  27
  28 QEMU_COMM_TIMEOUT=10
  29
  30 QEMU_FIFO_IN="${TEST_DIR}/qmp-in-$$"
  31 QEMU_FIFO_OUT="${TEST_DIR}/qmp-out-$$"
  32
  33 QEMU_HANDLE=0
  34
  35 # If bash version is >= 4.1, these will be overwritten and dynamic
  36 # file descriptor values assigned.
  37 _out_fd=3
  38 _in_fd=4
  39
  40 # Wait for expected QMP response from QEMU.  Will time out
  41 # after 10 seconds, which counts as failure.
  42 #
  43 # Override QEMU_COMM_TIMEOUT for a timeout different than the
  44 # default 10 seconds
  45 #
  46 # $1: The handle to use
  47 # $2+ All remaining arguments comprise the string to search for
  48 #    in the response.
  49 #
  50 # If $silent is set to anything but an empty string, then
  51 # response is not echoed out.
  52 function _timed_wait_for()
  53 {
  54     local h=${1}
  55     shift
  56
  57     QEMU_STATUS[$h]=0
  58     while read -t ${QEMU_COMM_TIMEOUT} resp <&${QEMU_OUT[$h]}
  59     do
  60         if [ -z "${silent}" ]; then
  61             echo "${resp}" | _filter_testdir | _filter_qemu \
  62                            | _filter_qemu_io | _filter_qmp
  63         fi
  64         grep -q "${*}" < <(echo ${resp})
  65         if [ $? -eq 0 ]; then
  66             return
  67         fi
  68     done
  69     QEMU_STATUS[$h]=-1
  70     if [ -z "${qemu_error_no_exit}" ]; then
  71         echo "Timeout waiting for ${*} on handle ${h}"
  72         exit 1  # Timeout means the test failed
  73     fi
  74 }
  75
  76
  77 # Sends QMP or HMP command to QEMU, and waits for the expected response
  78 #
  79 # $1:       QEMU handle to use
  80 # $2:       String of the QMP command to send
  81 # ${@: -1}  (Last string passed)
  82 #             String that the QEMU response should contain. If it is a null
  83 #             string, do not wait for a response
  84 #
  85 # Set qemu_cmd_repeat to the number of times to repeat the cmd
  86 # until either timeout, or a response.  If it is not set, or <=0,
  87 # then the command is only sent once.
  88 #
  89 # If $qemu_error_no_exit is set, then even if the expected response
  90 # is not seen, we will not exit.  $QEMU_STATUS[$1] will be set it -1 in
  91 # that case.
  92 function _send_qemu_cmd()
  93 {
  94     local h=${1}
  95     local count=1
  96     local cmd=
  97     local use_error=${qemu_error_no_exit}
  98     shift
  99
 100     if [ ${qemu_cmd_repeat} -gt 0 ] 2>/dev/null; then
 101         count=${qemu_cmd_repeat}
 102         use_error="no"
 103     fi
 104     # This array element extraction is done to accommodate pathnames with spaces
 105     cmd=${@: 1:${#@}-1}
 106     shift $(($# - 1))
 107
 108     while [ ${count} -gt 0 ]
 109     do
 110         echo "${cmd}" >&${QEMU_IN[${h}]}
 111         if [ -n "${1}" ]; then
 112             qemu_error_no_exit=${use_error} _timed_wait_for ${h} "${1}"
 113             if [ ${QEMU_STATUS[$h]} -eq 0 ]; then
 114                 return
 115             fi
 116         fi
 117         let count--;
 118     done
 119     if [ ${QEMU_STATUS[$h]} -ne 0 ] && [ -z "${qemu_error_no_exit}" ]; then
 120         echo "Timeout waiting for ${1} on handle ${h}"
 121         exit 1 #Timeout means the test failed
 122     fi
 123 }
 124
 125
 126 # Launch a QEMU process.
 127 #
 128 # Input parameters:
 129 # $qemu_comm_method: set this variable to 'monitor' (case insensitive)
 130 #                    to use the QEMU HMP monitor for communication.
 131 #                    Otherwise, the default of QMP is used.
 132 # $keep_stderr: Set this variable to 'y' to keep QEMU's stderr output on stderr.
 133 #               If this variable is empty, stderr will be redirected to stdout.
 134 # Returns:
 135 # $QEMU_HANDLE: set to a handle value to communicate with this QEMU instance.
 136 #
 137 function _launch_qemu()
 138 {
 139     local comm=
 140     local fifo_out=
 141     local fifo_in=
 142
 143     if (shopt -s nocasematch; [[ "${qemu_comm_method}" == "monitor" ]])
 144     then
 145         comm="-monitor stdio"
 146     else
 147         local qemu_comm_method="qmp"
 148         comm="-monitor none -qmp stdio"
 149     fi
 150
 151     fifo_out=${QEMU_FIFO_OUT}_${_QEMU_HANDLE}
 152     fifo_in=${QEMU_FIFO_IN}_${_QEMU_HANDLE}
 153     mkfifo "${fifo_out}"
 154     mkfifo "${fifo_in}"
 155
 156     if [ -z "$keep_stderr" ]; then
 157         QEMU_NEED_PID='y'\
 158         ${QEMU} -nographic -serial none ${comm} -machine accel=qtest "${@}" \
 159                                                                 >"${fifo_out}" \
 160                                                                 2>&1 \
 161                                                                 <"${fifo_in}" &
 162     elif [ "$keep_stderr" = "y" ]; then
 163         QEMU_NEED_PID='y'\
 164         ${QEMU} -nographic -serial none ${comm} -machine accel=qtest "${@}" \
 165                                                                 >"${fifo_out}" \
 166                                                                 <"${fifo_in}" &
 167     else
 168         exit 1
 169     fi
 170
 171     if [[ "${BASH_VERSINFO[0]}" -ge "5" ||
 172         ("${BASH_VERSINFO[0]}" -ge "4"  &&  "${BASH_VERSINFO[1]}" -ge "1") ]]
 173     then
 174         # bash >= 4.1 required for automatic fd
 175         exec {_out_fd}<"${fifo_out}"
 176         exec {_in_fd}>"${fifo_in}"
 177     else
 178         let _out_fd++
 179         let _in_fd++
 180         eval "exec ${_out_fd}<'${fifo_out}'"
 181         eval "exec ${_in_fd}>'${fifo_in}'"
 182     fi
 183
 184     QEMU_OUT[${_QEMU_HANDLE}]=${_out_fd}
 185     QEMU_IN[${_QEMU_HANDLE}]=${_in_fd}
 186     QEMU_STATUS[${_QEMU_HANDLE}]=0
 187
 188     if [ "${qemu_comm_method}" == "qmp" ]
 189     then
 190         # Don't print response, since it has version information in it
 191         silent=yes _timed_wait_for ${_QEMU_HANDLE} "capabilities"
 192     fi
 193     QEMU_HANDLE=${_QEMU_HANDLE}
 194     let _QEMU_HANDLE++
 195 }
 196
 197
 198 # Silenty kills the QEMU process
 199 #
 200 # If $wait is set to anything other than the empty string, the process will not
 201 # be killed but only waited for, and any output will be forwarded to stdout. If
 202 # $wait is empty, the process will be killed and all output will be suppressed.
 203 function _cleanup_qemu()
 204 {
 205     # QEMU_PID[], QEMU_IN[], QEMU_OUT[] all use same indices
 206     for i in "${!QEMU_OUT[@]}"
 207     do
 208         local QEMU_PID
 209         if [ -f "${TEST_DIR}/qemu-${i}.pid" ]; then
 210             read QEMU_PID < "${TEST_DIR}/qemu-${i}.pid"
 211             rm -f "${TEST_DIR}/qemu-${i}.pid"
 212             if [ -z "${wait}" ] && [ -n "${QEMU_PID}" ]; then
 213                 kill -KILL ${QEMU_PID} 2>/dev/null
 214             fi
 215             if [ -n "${QEMU_PID}" ]; then
 216                 wait ${QEMU_PID} 2>/dev/null # silent kill
 217             fi
 218         fi
 219
 220         if [ -n "${wait}" ]; then
 221             cat <&${QEMU_OUT[$i]} | _filter_testdir | _filter_qemu \
 222                                   | _filter_qemu_io | _filter_qmp
 223         fi
 224         rm -f "${QEMU_FIFO_IN}_${i}" "${QEMU_FIFO_OUT}_${i}"
 225         eval "exec ${QEMU_IN[$i]}<&-"   # close file descriptors
 226         eval "exec ${QEMU_OUT[$i]}<&-"
 227     done
 228 }