15cfba693b
Redirecting qemu's stderr to stdout makes working with the stderr output
difficult due to the other file descriptor magic performed in
_launch_qemu ("ambiguous redirect").
Add an option which specifies whether stderr should be redirected to
stdout or not (allowing for other modes to be added in the future).
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
229 lines
7.2 KiB
Bash
229 lines
7.2 KiB
Bash
#!/bin/bash
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#
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# This allows for launching of multiple QEMU instances, with independent
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# communication possible to each instance.
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#
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# Each instance can choose, at launch, to use either the QMP or the
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# HMP (monitor) interface.
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#
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# All instances are cleaned up via _cleanup_qemu, including killing the
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# running qemu instance.
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#
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# Copyright (C) 2014 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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QEMU_COMM_TIMEOUT=10
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QEMU_FIFO_IN="${TEST_DIR}/qmp-in-$$"
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QEMU_FIFO_OUT="${TEST_DIR}/qmp-out-$$"
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QEMU_HANDLE=0
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# If bash version is >= 4.1, these will be overwritten and dynamic
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# file descriptor values assigned.
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_out_fd=3
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_in_fd=4
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# Wait for expected QMP response from QEMU. Will time out
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# after 10 seconds, which counts as failure.
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#
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# Override QEMU_COMM_TIMEOUT for a timeout different than the
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# default 10 seconds
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#
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# $1: The handle to use
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# $2+ All remaining arguments comprise the string to search for
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# in the response.
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#
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# If $silent is set to anything but an empty string, then
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# response is not echoed out.
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function _timed_wait_for()
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{
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local h=${1}
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shift
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QEMU_STATUS[$h]=0
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while read -t ${QEMU_COMM_TIMEOUT} resp <&${QEMU_OUT[$h]}
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do
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if [ -z "${silent}" ]; then
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echo "${resp}" | _filter_testdir | _filter_qemu \
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| _filter_qemu_io | _filter_qmp
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fi
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grep -q "${*}" < <(echo ${resp})
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if [ $? -eq 0 ]; then
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return
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fi
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done
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QEMU_STATUS[$h]=-1
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if [ -z "${qemu_error_no_exit}" ]; then
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echo "Timeout waiting for ${*} on handle ${h}"
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exit 1 # Timeout means the test failed
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fi
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}
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# Sends QMP or HMP command to QEMU, and waits for the expected response
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#
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# $1: QEMU handle to use
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# $2: String of the QMP command to send
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# ${@: -1} (Last string passed)
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# String that the QEMU response should contain. If it is a null
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# string, do not wait for a response
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#
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# Set qemu_cmd_repeat to the number of times to repeat the cmd
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# until either timeout, or a response. If it is not set, or <=0,
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# then the command is only sent once.
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#
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# If $qemu_error_no_exit is set, then even if the expected response
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# is not seen, we will not exit. $QEMU_STATUS[$1] will be set it -1 in
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# that case.
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function _send_qemu_cmd()
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{
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local h=${1}
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local count=1
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local cmd=
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local use_error=${qemu_error_no_exit}
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shift
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if [ ${qemu_cmd_repeat} -gt 0 ] 2>/dev/null; then
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count=${qemu_cmd_repeat}
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use_error="no"
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fi
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# This array element extraction is done to accommodate pathnames with spaces
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cmd=${@: 1:${#@}-1}
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shift $(($# - 1))
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while [ ${count} -gt 0 ]
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do
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echo "${cmd}" >&${QEMU_IN[${h}]}
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if [ -n "${1}" ]; then
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qemu_error_no_exit=${use_error} _timed_wait_for ${h} "${1}"
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if [ ${QEMU_STATUS[$h]} -eq 0 ]; then
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return
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fi
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fi
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let count--;
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done
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if [ ${QEMU_STATUS[$h]} -ne 0 ] && [ -z "${qemu_error_no_exit}" ]; then
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echo "Timeout waiting for ${1} on handle ${h}"
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exit 1 #Timeout means the test failed
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fi
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}
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# Launch a QEMU process.
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#
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# Input parameters:
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# $qemu_comm_method: set this variable to 'monitor' (case insensitive)
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# to use the QEMU HMP monitor for communication.
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# Otherwise, the default of QMP is used.
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# $keep_stderr: Set this variable to 'y' to keep QEMU's stderr output on stderr.
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# If this variable is empty, stderr will be redirected to stdout.
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# Returns:
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# $QEMU_HANDLE: set to a handle value to communicate with this QEMU instance.
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#
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function _launch_qemu()
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{
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local comm=
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local fifo_out=
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local fifo_in=
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if (shopt -s nocasematch; [[ "${qemu_comm_method}" == "monitor" ]])
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then
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comm="-monitor stdio"
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else
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local qemu_comm_method="qmp"
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comm="-monitor none -qmp stdio"
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fi
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fifo_out=${QEMU_FIFO_OUT}_${_QEMU_HANDLE}
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fifo_in=${QEMU_FIFO_IN}_${_QEMU_HANDLE}
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mkfifo "${fifo_out}"
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mkfifo "${fifo_in}"
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if [ -z "$keep_stderr" ]; then
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QEMU_NEED_PID='y'\
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${QEMU} -nographic -serial none ${comm} -machine accel=qtest "${@}" \
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>"${fifo_out}" \
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2>&1 \
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<"${fifo_in}" &
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elif [ "$keep_stderr" = "y" ]; then
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QEMU_NEED_PID='y'\
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${QEMU} -nographic -serial none ${comm} -machine accel=qtest "${@}" \
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>"${fifo_out}" \
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<"${fifo_in}" &
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else
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exit 1
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fi
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if [[ "${BASH_VERSINFO[0]}" -ge "5" ||
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("${BASH_VERSINFO[0]}" -ge "4" && "${BASH_VERSINFO[1]}" -ge "1") ]]
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then
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# bash >= 4.1 required for automatic fd
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exec {_out_fd}<"${fifo_out}"
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exec {_in_fd}>"${fifo_in}"
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else
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let _out_fd++
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let _in_fd++
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eval "exec ${_out_fd}<'${fifo_out}'"
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eval "exec ${_in_fd}>'${fifo_in}'"
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fi
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QEMU_OUT[${_QEMU_HANDLE}]=${_out_fd}
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QEMU_IN[${_QEMU_HANDLE}]=${_in_fd}
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QEMU_STATUS[${_QEMU_HANDLE}]=0
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if [ "${qemu_comm_method}" == "qmp" ]
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then
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# Don't print response, since it has version information in it
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silent=yes _timed_wait_for ${_QEMU_HANDLE} "capabilities"
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fi
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QEMU_HANDLE=${_QEMU_HANDLE}
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let _QEMU_HANDLE++
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}
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# Silenty kills the QEMU process
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#
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# If $wait is set to anything other than the empty string, the process will not
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# be killed but only waited for, and any output will be forwarded to stdout. If
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# $wait is empty, the process will be killed and all output will be suppressed.
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function _cleanup_qemu()
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{
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# QEMU_PID[], QEMU_IN[], QEMU_OUT[] all use same indices
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for i in "${!QEMU_OUT[@]}"
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do
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local QEMU_PID
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if [ -f "${TEST_DIR}/qemu-${i}.pid" ]; then
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read QEMU_PID < "${TEST_DIR}/qemu-${i}.pid"
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rm -f "${TEST_DIR}/qemu-${i}.pid"
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if [ -z "${wait}" ] && [ -n "${QEMU_PID}" ]; then
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kill -KILL ${QEMU_PID} 2>/dev/null
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fi
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if [ -n "${QEMU_PID}" ]; then
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wait ${QEMU_PID} 2>/dev/null # silent kill
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fi
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fi
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if [ -n "${wait}" ]; then
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cat <&${QEMU_OUT[$i]} | _filter_testdir | _filter_qemu \
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| _filter_qemu_io | _filter_qmp
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fi
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rm -f "${QEMU_FIFO_IN}_${i}" "${QEMU_FIFO_OUT}_${i}"
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eval "exec ${QEMU_IN[$i]}<&-" # close file descriptors
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eval "exec ${QEMU_OUT[$i]}<&-"
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done
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}
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