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passt/test/lib/context
David Gibson 56e755ba11 test: Use context system for guest commands
Extends the context system in the test scripts to allow executing commands
within a guest.  Do this without requiring an existing network in the guest
by using socat to run ssh via a vsock connection.

We do need some additional "sleep"s in the tests, because the new
faster dispatch means that sometimes we attempt to connect before
socat has managed to listen.

For now, only use this for the plain "passt" tests.  The "passt_in_ns" and
other tests have additional complications we still need to deal with.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-13 05:32:00 +02:00

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#! /bin/sh
#
# SPDX-License-Identifier: AGPL-3.0-or-later
#
# PASST - Plug A Simple Socket Transport
# for qemu/UNIX domain socket mode
#
# PASTA - Pack A Subtle Tap Abstraction
# for network namespace/tap device mode
#
# test/lib/context - Run commands in different contexts (host, guest, namespace etc.)
#
# Copyright Red Hat
# Author: David Gibson <david@gibson.dropbear.id.au>
# context_setup_common() - Create outline of a new context
# $1: Context name
context_setup_common() {
__name="$1"
__prefix="${LOGDIR}/context_${__name}"
echo -n "${__name}$ " > "${__prefix}.log"
}
# context_setup_host() - Create a new context for running commands on the host
# $1: Context name
context_setup_host() {
__name="$1"
__prefix="${LOGDIR}/context_${__name}"
context_setup_common "${__name}"
echo sh -c > "${__prefix}.enter"
}
# context_setup_nsenter() - Create a new context for running commands in a namespace
# $1: Context name
# $2: Namespace PID
context_setup_nsenter() {
__name="$1"
shift
__prefix="${LOGDIR}/context_${__name}"
context_setup_common "${__name}"
echo "nsenter $@ sh -c" > "${__prefix}.enter"
}
# context_setup_guest() - Create a new context for running commands in a guest
# $1: Context name
# $2: CID to use for vsock
context_setup_guest() {
__name="$1"
__cid="$2"
__prefix="${LOGDIR}/context_${__name}"
context_setup_common "${__name}"
cat > "${__prefix}.ssh" <<EOF
Host ${__name}
User root
UserKnownHostsFile ${__prefix}.hosts
StrictHostKeyChecking no
IdentityFile ${BASEPATH}/guest-key
IdentityAgent none
ProxyCommand socat - VSOCK-CONNECT:${__cid}:22
EOF
echo "ssh -F ${__prefix}.ssh ${__name}" > "${__prefix}.enter"
# Wait for the guest to be booted and accepting connections
while ! ssh -F "${__prefix}.ssh" "${__name}" :; do
sleep 0.1
done
}
# context_teardown() - Remove a context (leave log files intact)
# $1: Context name
context_teardown() {
__name="$1"
__prefix="${LOGDIR}/context_${__name}"
rm -f "${__prefix}.enter" "${__prefix}.ssh" "${__prefix}.hosts"
}
# context_exists() - Test if a context currently exists
# $1: Context name
context_exists() {
__name="$1"
__prefix="${LOGDIR}/context_${__name}"
[ -f "${__prefix}.enter" ]
}
# context_run() - Run a shell command in a context, and wait for it to finish
# $1: Context name
# $*: Command to start
context_run() {
__name="$1"
__prefix="${LOGDIR}/context_${__name}"
__enter="$(cat "${__prefix}.enter")"
shift
echo "$*" >> "${__prefix}.log"
mkfifo "${__prefix}.stdout" "${__prefix}.stderr"
tee -a "${__prefix}.log" < "${__prefix}.stdout" &
tee -a "${__prefix}.log" < "${__prefix}.stderr" >&2 &
${__enter} "$*" >> "${__prefix}.stdout" 2>> "${__prefix}.stderr"
rc=$?
rm "${__prefix}.stdout" "${__prefix}.stderr"
[ ${DEBUG} -eq 1 ] && echo "[Exit code: $rc]" >> "${__prefix}.log"
echo -n "${__name}$ " >> "${__prefix}.log"
return $rc
}
# context_run_bg() - Start a shell command in a context
# $1: Context name
# $*: Command to start
context_run_bg() {
__name="$1"
__prefix="${LOGDIR}/context_${__name}"
context_run "$@" &
echo $! > "${__prefix}.pid"
}
# context_wait() - Wait for background command in a context to complete
# $1: Context name
# Returns the status of the completed command
context_wait() {
__name="$1"
__prefix="${LOGDIR}/context_${__name}"
__pid=$(cat "${__prefix}.pid")
rm "${__prefix}.pid"
wait ${__pid}
}