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#! /bin/sh
#
# SPDX-License-Identifier: GPL-2.0-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="$1"
__log="${LOGDIR}/context_${__name}.log"
echo -n "${__name}$ " > "${__log}"
}
# context_setup_host() - Create a new context for running commands on the host
# $1: Context name
context_setup_host() {
__name="$1"
__enter="${STATESETUP}/context_${__name}.enter"
context_setup_common "${__name}"
echo sh -c > "${__enter}"
}
# context_setup_nsenter() - Create a new context for running commands in a namespace
# $1: Context name
# $2: Namespace PID
context_setup_nsenter() {
__name="$1"
shift
__enter="${STATESETUP}/context_${__name}.enter"
context_setup_common "${__name}"
echo "nsenter $@ sh -c" > "${__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="$2"
__enter="${STATESETUP}/context_${__name}.enter"
__ssh="${STATESETUP}/context_${__name}.ssh"
context_setup_common "${__name}"
cat > "${__ssh}" <<EOF
Host ${__name}
User root
UserKnownHostsFile ${STATESETUP}/context_${__name}.hosts
StrictHostKeyChecking no
IdentityFile ${BASEPATH}/guest-key
IdentityAgent none
ProxyCommand socat - VSOCK-CONNECT:${__cid}:22
EOF
echo "ssh -F ${__ssh} ${__name}" > "${__enter}"
# Wait for the guest to be booted and accepting connections
wait_for ssh -F "${__ssh}" "${__name}" :
}
# context_teardown() - Remove a context (leave log files intact)
# $1: Context name
context_teardown() {
__name="$1"
__prefix="${STATESETUP}/context_${__name}"
rm -f "${__prefix}.enter" "${__prefix}.ssh" "${__prefix}.hosts"
}
# context_exists() - Test if a context currently exists
# $1: Context name
context_exists() {
__name="$1"
__enter="${STATESETUP}/context_${__name}.enter"
[ -f "${__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="$1"
__log="${LOGDIR}/context_${__name}.log"
__enter="${STATESETUP}/context_${__name}.enter"
__stdout="$(mktemp -u "${STATESETUP}/context_${__name}.stdout.XXXXXXXX")"
__stderr="$(mktemp -u "${STATESETUP}/context_${__name}.stderr.XXXXXXXX")"
shift
echo "$*" >> "${__log}"
mkfifo "${__stdout}" "${__stderr}"
tee -a "${__log}" < "${__stdout}" &
tee -a "${__log}" < "${__stderr}" >&2 &
$(cat ${__enter}) "$*" >> "${__stdout}" 2>> "${__stderr}"
rc=$?
rm "${__stdout}" "${__stderr}"
[ ${DEBUG} -eq 1 ] && echo "[Exit code: $rc]" >> "${__log}"
echo -n "${__name}$ " >> "${__log}"
return $rc
}
# context_run_bg() - Start a shell command in a context
# $1: Context name
# $*: Command to start
context_run_bg() {
__name="$1"
__pidfile="${STATESETUP}/context_${__name}.pid"
context_run "$@" &
echo $! > "${__pidfile}"
}
# context_wait() - Wait for background command in a context to complete
# $1: Context name
# Returns the status of the completed command
context_wait() {
__name="$1"
__pidfile="${STATESETUP}/context_${__name}.pid"
__pid=$(cat "${__pidfile}")
rm "${__pidfile}"
wait ${__pid}
}
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