vcontainer: add vruntime distro and multiconfigs

Add minimal vruntime distro for building QEMU blob images:
- conf/distro/vruntime.conf: Minimal distro with vcontainer features
- conf/multiconfig/vruntime-aarch64.conf: aarch64 multiconfig
- conf/multiconfig/vruntime-x86-64.conf: x86-64 multiconfig

The vruntime distro provides a minimal environment for building
Docker/Podman rootfs images used by vdkr/vpdmn.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

3 files changed, 77 insertions, 0 deletions

diff --git a/conf/distro/vruntime.conf b/conf/distro/vruntime.conf
new file mode 100644
index 00000000..a10df80f
--- /dev/null
+++ b/conf/distro/vruntime.conf
@@ -0,0 +1,47 @@
+# SPDX-FileCopyrightText: Copyright (C) 2025 Bruce Ashfield
+#
+# SPDX-License-Identifier: MIT
+#
+# VRuntime - Minimal distro for vdkr/vpdmn container runtime environments
+#
+# This distro is used by multiconfig builds (vruntime-aarch64, vruntime-x86-64)
+# to create minimal rootfs images for QEMU-based container processing.
+#
+# The resulting images contain Docker or Podman tools and are used by
+# vrunner.sh to import containers during Yocto image builds.
+
+require conf/distro/poky.conf
+
+DISTRO = "vruntime"
+DISTRO_NAME = "VRuntime Minimal"
+DISTRO_VERSION = "1.0"
+
+# Minimal distro features for container runtime environment
+# - acl: Access control lists (containers need this)
+# - ext2: Filesystem support
+# - ipv4/ipv6: Network support for container networking
+# - seccomp: Security for container isolation
+# - vfat: For potential boot partition support
+# - pci: PCI device support (virtio devices)
+# - vcontainer: Enable vdkr/vpdmn kernel config fragments (9p, squashfs, overlayfs)
+#
+# Explicitly NOT included: x11, wayland, pulseaudio, bluetooth, wifi, nfc, 3g, pcmcia
+DISTRO_FEATURES = "acl ext2 ipv4 ipv6 seccomp vfat pci vcontainer"
+
+# Native and nativesdk classes need full features for build tools
+DISTRO_FEATURES:class-native = "${DISTRO_FEATURES_DEFAULT} ${POKY_DEFAULT_DISTRO_FEATURES}"
+DISTRO_FEATURES:class-nativesdk = "${DISTRO_FEATURES_DEFAULT} ${POKY_DEFAULT_DISTRO_FEATURES}"
+
+# Default to ext4, but image recipes may override to squashfs
+IMAGE_FSTYPES = "ext4"
+
+# Use busybox init for minimal footprint
+# The vdkr/vpdmn images use custom /init scripts anyway
+VIRTUAL-RUNTIME_init_manager = "busybox"
+VIRTUAL-RUNTIME_initscripts = "initscripts"
+
+# Disable unnecessary features
+VIRTUAL-RUNTIME_login_manager = ""
+
+# Keep images small - no documentation or debug
+EXTRA_IMAGE_FEATURES = ""
diff --git a/conf/multiconfig/vruntime-aarch64.conf b/conf/multiconfig/vruntime-aarch64.conf
new file mode 100644
index 00000000..f9f0276c
--- /dev/null
+++ b/conf/multiconfig/vruntime-aarch64.conf
@@ -0,0 +1,15 @@
+# SPDX-FileCopyrightText: Copyright (C) 2025 Bruce Ashfield
+#
+# SPDX-License-Identifier: MIT
+#
+# Multiconfig for vruntime aarch64 builds
+#
+# Used to build minimal container-runtime-capable rootfs for QEMU environment.
+# Supports vdkr (Docker) and vpdmn (Podman) virtual container runtimes.
+#
+# Distro-level configuration (DISTRO_FEATURES, etc.) is in conf/distro/vruntime.conf
+# Kernel features (squashfs, overlayfs) are in recipes-kernel/linux/linux-yocto_%.bbappend
+
+DISTRO = "vruntime"
+MACHINE = "qemuarm64"
+TMPDIR = "${TOPDIR}/tmp-vruntime-aarch64"
diff --git a/conf/multiconfig/vruntime-x86-64.conf b/conf/multiconfig/vruntime-x86-64.conf
new file mode 100644
index 00000000..d897f398
--- /dev/null
+++ b/conf/multiconfig/vruntime-x86-64.conf
@@ -0,0 +1,15 @@
+# SPDX-FileCopyrightText: Copyright (C) 2025 Bruce Ashfield
+#
+# SPDX-License-Identifier: MIT
+#
+# Multiconfig for vruntime x86-64 builds
+#
+# Used to build minimal container-runtime-capable rootfs for QEMU environment.
+# Supports vdkr (Docker) and vpdmn (Podman) virtual container runtimes.
+#
+# Distro-level configuration (DISTRO_FEATURES, etc.) is in conf/distro/vruntime.conf
+# Kernel features (squashfs, overlayfs) are in recipes-kernel/linux/linux-yocto_%.bbappend
+
+DISTRO = "vruntime"
+MACHINE = "qemux86-64"
+TMPDIR = "${TOPDIR}/tmp-vruntime-x86-64"