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context_run() has a race condition if two commands are run in close proximity (generally involving at least one in the background). Because we always use the same name for the temporary fifo files, if another command is issued while the fifos for the first still exist, mkfifo will fail, typically causing the entire test script to jam. Create unique names for the temporary fifos to avoid this problem. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
127 lines
3.4 KiB
Bash
127 lines
3.4 KiB
Bash
#! /bin/sh
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#
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# PASST - Plug A Simple Socket Transport
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# for qemu/UNIX domain socket mode
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#
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# PASTA - Pack A Subtle Tap Abstraction
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# for network namespace/tap device mode
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#
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# test/lib/context - Run commands in different contexts (host, guest, namespace etc.)
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#
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# Copyright Red Hat
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# Author: David Gibson <david@gibson.dropbear.id.au>
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# context_setup_common() - Create outline of a new context
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# $1: Context name
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context_setup_common() {
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__name="$1"
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__log="${LOGDIR}/context_${__name}.log"
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echo -n "${__name}$ " > "${__log}"
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}
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# context_setup_host() - Create a new context for running commands on the host
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# $1: Context name
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context_setup_host() {
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__name="$1"
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__enter="${STATESETUP}/context_${__name}.enter"
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context_setup_common "${__name}"
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echo sh -c > "${__enter}"
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}
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# context_setup_nsenter() - Create a new context for running commands in a namespace
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# $1: Context name
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# $2: Namespace PID
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context_setup_nsenter() {
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__name="$1"
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shift
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__enter="${STATESETUP}/context_${__name}.enter"
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context_setup_common "${__name}"
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echo "nsenter $@ sh -c" > "${__enter}"
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}
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# context_setup_guest() - Create a new context for running commands in a guest
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# $1: Context name
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# $2: CID to use for vsock
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context_setup_guest() {
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__name="$1"
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__cid="$2"
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__enter="${STATESETUP}/context_${__name}.enter"
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__ssh="${STATESETUP}/context_${__name}.ssh"
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context_setup_common "${__name}"
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cat > "${__ssh}" <<EOF
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Host ${__name}
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User root
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UserKnownHostsFile ${STATESETUP}/context_${__name}.hosts
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StrictHostKeyChecking no
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IdentityFile ${BASEPATH}/guest-key
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IdentityAgent none
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ProxyCommand socat - VSOCK-CONNECT:${__cid}:22
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EOF
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echo "ssh -F ${__ssh} ${__name}" > "${__enter}"
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# Wait for the guest to be booted and accepting connections
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wait_for ssh -F "${__ssh}" "${__name}" :
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}
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# context_teardown() - Remove a context (leave log files intact)
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# $1: Context name
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context_teardown() {
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__name="$1"
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__prefix="${STATESETUP}/context_${__name}"
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rm -f "${__prefix}.enter" "${__prefix}.ssh" "${__prefix}.hosts"
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}
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# context_exists() - Test if a context currently exists
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# $1: Context name
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context_exists() {
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__name="$1"
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__enter="${STATESETUP}/context_${__name}.enter"
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[ -f "${__enter}" ]
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}
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# context_run() - Run a shell command in a context, and wait for it to finish
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# $1: Context name
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# $*: Command to start
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context_run() {
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__name="$1"
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__log="${LOGDIR}/context_${__name}.log"
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__enter="${STATESETUP}/context_${__name}.enter"
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__stdout="$(mktemp -u "${STATESETUP}/context_${__name}.stdout.XXXXXXXX")"
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__stderr="$(mktemp -u "${STATESETUP}/context_${__name}.stderr.XXXXXXXX")"
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shift
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echo "$*" >> "${__log}"
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mkfifo "${__stdout}" "${__stderr}"
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tee -a "${__log}" < "${__stdout}" &
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tee -a "${__log}" < "${__stderr}" >&2 &
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$(cat ${__enter}) "$*" >> "${__stdout}" 2>> "${__stderr}"
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rc=$?
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rm "${__stdout}" "${__stderr}"
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[ ${DEBUG} -eq 1 ] && echo "[Exit code: $rc]" >> "${__log}"
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echo -n "${__name}$ " >> "${__log}"
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return $rc
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}
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# context_run_bg() - Start a shell command in a context
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# $1: Context name
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# $*: Command to start
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context_run_bg() {
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__name="$1"
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__pidfile="${STATESETUP}/context_${__name}.pid"
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context_run "$@" &
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echo $! > "${__pidfile}"
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}
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# context_wait() - Wait for background command in a context to complete
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# $1: Context name
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# Returns the status of the completed command
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context_wait() {
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__name="$1"
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__pidfile="${STATESETUP}/context_${__name}.pid"
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__pid=$(cat "${__pidfile}")
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rm "${__pidfile}"
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wait ${__pid}
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}
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