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'make qemu share=<dir>' (or share="tag=dir ...") starts one virtiofsd per share and adds the matching vhost-user-fs devices, so the guest sees /scheme/virtio-fsd.<tag>. podman_bootstrap.sh installs virtiofsd, and the selftest recipe builds from the base source. Signed-off-by: MJ Pooladkhay <mj@pooladkhay.com>
125 lines
4.1 KiB
Bash
Executable File
125 lines
4.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Run a command (normally QEMU) next to one virtiofsd per shared host directory.
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#
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# virtiofs-run.sh --share <socket> <tag>=<dir> [--share ...] -- <command...>
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#
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# Used by `make qemu share=...` (see mk/qemu.mk). Each virtiofsd is started in
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# the background and logs to <socket minus .sock>.log. All of them are stopped
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# again when the command exits, fails to start, or is interrupted.
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#
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# virtiofsd is taken from $VIRTIOFSD, PATH, /usr/libexec, /usr/lib/qemu or
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# ~/.cache/virtiofsd-redox. podman_bootstrap.sh installs it.
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set -euo pipefail
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die() {
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echo "virtiofs: $*" >&2
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exit 1
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}
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usage() {
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echo "usage: $0 --share <socket> <tag>=<dir> [--share ...] -- <command...>" >&2
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exit 2
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}
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SOCKS=()
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SPECS=()
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while [[ "${1:-}" == --share ]]; do
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[[ $# -ge 3 ]] || usage
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SOCKS+=("$2")
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SPECS+=("$3")
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shift 3
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done
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[[ ${#SOCKS[@]} -gt 0 && "${1:-}" == -- && $# -gt 1 ]] || usage
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shift
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# Validate everything before starting anything, so a mistake leaves nothing running
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seen_tags=" "
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for i in "${!SOCKS[@]}"; do
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sock="${SOCKS[i]}" spec="${SPECS[i]}"
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[[ "${spec}" == *=* ]] || die "share '${spec}': expected <tag>=<dir>"
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tag="${spec%%=*}" dir="${spec#*=}"
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[[ "${tag}" =~ ^[A-Za-z0-9._-]+$ ]] \
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|| die "tag '${tag}': only letters, digits, '.', '_' and '-' are allowed (is '${spec}' a directory with an '=' in it? use tag=dir)"
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[[ ${#tag} -le 36 ]] || die "tag '${tag}': longer than 36 bytes"
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[[ "${seen_tags}" != *" ${tag} "* ]] || die "tag '${tag}' is used twice"
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seen_tags+="${tag} "
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[[ -n "${dir}" ]] || die "share '${tag}': empty directory"
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[[ "${dir}" != *[[:space:]]* ]] \
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|| die "share '${tag}': directories containing whitespace are not supported ('${dir}')"
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[[ "${sock}" == *.sock ]] || die "socket '${sock}' must end in .sock"
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# AF_UNIX sun_path is 108 bytes including the NUL
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[[ ${#sock} -lt 108 ]] \
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|| die "socket path too long (${#sock} bytes): ${sock}; use a shorter share_sockdir"
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done
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find_virtiofsd() {
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local c
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for c in "${VIRTIOFSD:-}" virtiofsd /usr/libexec/virtiofsd /usr/lib/qemu/virtiofsd \
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"${XDG_CACHE_HOME:-${HOME:-/tmp}/.cache}/virtiofsd-redox/virtiofsd"; do
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[[ -n "${c}" ]] && command -v "${c}" && return 0
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done
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return 1
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}
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VIRTIOFSD_BIN="$(find_virtiofsd)" \
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|| die "virtiofsd not found. Install it (e.g. 'dnf install virtiofsd' or 'pacman -S virtiofsd'), run ./podman_bootstrap.sh -d, or set VIRTIOFSD=/path/to/virtiofsd"
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PIDS=()
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cleanup() {
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trap - EXIT INT TERM
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if [[ ${#PIDS[@]} -gt 0 ]]; then
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kill "${PIDS[@]}" 2>/dev/null || true
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wait "${PIDS[@]}" 2>/dev/null || true
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fi
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rm -f "${SOCKS[@]}" "${SOCKS[@]/%/.pid}"
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}
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trap cleanup EXIT
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trap 'exit 130' INT
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trap 'exit 143' TERM
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resolved_dirs=" "
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for i in "${!SOCKS[@]}"; do
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sock="${SOCKS[i]}" spec="${SPECS[i]}"
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mkdir -p "${spec#*=}" "$(dirname "${sock}")"
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dir="$(cd "${spec#*=}" && pwd)"
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if [[ "${resolved_dirs}" == *" ${dir} "* ]]; then
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echo "virtiofs: warning: ${dir} is shared more than once; the instances do not share caches" >&2
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fi
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resolved_dirs+="${dir} "
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rm -f "${sock}" "${sock}.pid"
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# The guest root maps to the invoking user, so files created in the guest
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# are owned by you on the host.
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# --sandbox none avoids needing root or user namespaces.
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"${VIRTIOFSD_BIN}" \
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--socket-path="${sock}" \
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--shared-dir "${dir}" \
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--sandbox none \
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--log-level warn \
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--translate-uid="map:0:$(id -u):1" \
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--translate-gid="map:0:$(id -g):1" \
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</dev/null >"${sock%.sock}.log" 2>&1 &
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PIDS+=("$!")
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done
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# Wait (up to ~5 seconds per share) until every socket exists
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for i in "${!SOCKS[@]}"; do
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sock="${SOCKS[i]}" tag="${SPECS[i]%%=*}" log="${SOCKS[i]%.sock}.log"
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for _ in $(seq 50); do
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[[ -S "${sock}" ]] && break
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kill -0 "${PIDS[i]}" 2>/dev/null || break
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sleep 0.1
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done
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if [[ ! -S "${sock}" ]]; then
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echo "virtiofs: virtiofsd for '${tag}' did not create ${sock}; see ${log}" >&2
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tail -n 20 "${log}" >&2 || true
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exit 1
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fi
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echo "virtiofs: sharing '${tag}' = ${SPECS[i]#*=} (log: ${log})" >&2
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done
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# Run the command as a child, not with exec, so that the EXIT trap still runs
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# and stops the virtiofsd processes once the command is done.
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"$@"
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