linux/meta-virtualization.git/recipes-containers/vcontainer/files/vrunner-backend-xen.sh, branch master

vxn: add per-container DomU lifecycle and memres persistent DomU

2026-02-26T01:05:01+00:00

Per-container DomU lifecycle: - run -d: per-container DomU with daemon loop and PTY-based IPC - ps: show Running vs Exited(code) via ===STATUS=== PTY query - exec/stop/rm: send commands to per-container DomU - logs: retrieve entrypoint output from running DomU - Entrypoint death detection with configurable grace period - Graceful error messages for ~25 unsupported commands - Command quoting fix: word-count+cut preserves internal spaces Memres (persistent DomU for fast container dispatch): - vxn memres start/stop/status/list for persistent DomU management - vxn run auto-dispatches to memres via xl block-attach + RUN_CONTAINER - Guest daemon loop handles ===RUN_CONTAINER===: mount hot-plugged xvdb, extract OCI rootfs, chroot exec entrypoint, unmount, report - Falls back to ephemeral mode when memres is occupied (PING timeout) - Xen-specific memres list shows xl domains and orphan detection Tested: vxn memres start + vxn run --rm alpine echo hello + vxn run --rm hello-world both produce correct output. Signed-off-by: Bruce Ashfield

vxn: fix non-interactive mode for clean container output

2026-02-26T01:05:01+00:00

Fix several issues preventing non-interactive mode (vxn --no-daemon run) from showing clean container output: - Fix console capture: check DAEMON_MODE instead of DAEMON_SOCKET in Xen backend so ephemeral runs use xl console capture instead of the daemon socat bridge (DAEMON_SOCKET is always set, DAEMON_MODE is only "start" for actual daemon launches) - Fix race condition: add post-loop marker detection after VM exits, with 2s delay for xl console to flush its buffer - Add stdbuf -oL to xl console for line-buffered output - Suppress mke2fs stdout (was only redirecting stderr) - Suppress kernel console messages during VM lifecycle in non-verbose mode - Fix grep -P (Perl regex) for BusyBox compatibility in exit code parsing - Preserve temp directory on failure for debugging - Fix hardcoded "QEMU" in error messages to "VM" Signed-off-by: Bruce Ashfield

vxn: add Xen DomU container runtime with OCI image support

2026-02-26T01:05:01+00:00

vxn runs OCI containers as Xen DomU guests — the VM IS the container. No Docker/containerd runs inside the guest; the init script directly mounts the container rootfs and execs the entrypoint via chroot. Host-side (Dom0): - vxn.sh: Docker-like CLI wrapper (sets HYPERVISOR=xen) - vrunner-backend-xen.sh: Xen xl backend for vrunner - hv_prepare_container(): pulls OCI images via skopeo, resolves entrypoint from OCI config using jq on host - xl create for VM lifecycle (PVH on aarch64, PV on x86_64) - Bridge networking with iptables DNAT for port forwards - Console capture via xl console for ephemeral mode Guest-side (DomU): - vxn-init.sh: mounts container rootfs from input disk, extracts OCI layers, execs entrypoint via chroot - Supports containers with or without /bin/sh - grep/sed fallback for OCI config parsing (no jq needed) - Daemon mode with command loop on hvc1 - vcontainer-init-common.sh: hypervisor detection, head -n fix - vcontainer-preinit.sh: init selection via vcontainer.init= Build system: - vxn-initramfs-create.inc: assembles boot blobs from vruntime multiconfig, injects vxn-init.sh into rootfs squashfs - vxn_1.0.bb: Dom0 package with scripts + blobs - nostamp on install/package chain (blobs from DEPLOY_DIR are untracked by sstate) - vxn.cfg: Xen PV kernel config fragment Tested: vxn -it --no-daemon run --rm hello-world Signed-off-by: Bruce Ashfield