vcontainer: add sanity checks and auto-enable virtfs for QEMU

Fix virtio-9p (virtfs) support for container-cross-install batch
imports which provides ~50x speedup over base64-over-serial.

The issue was that native recipes don't see target DISTRO_FEATURES,
so qemu-system-native wasn't getting virtfs enabled.

Fix by:
- layer.conf: Propagate virtualization to DISTRO_FEATURES_NATIVE when
  vcontainer or virtualization is in target DISTRO_FEATURES
- qemu-system-native: Check DISTRO_FEATURES_NATIVE for virtfs enable
- container-cross-install: Prepend native sysroot to PATH so vrunner
  finds the QEMU with virtfs support

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

1 files changed, 4 insertions, 0 deletions

diff --git a/conf/layer.conf b/conf/layer.conf
index 85694344..6eadc87f 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -76,4 +76,8 @@ USER_CLASSES:append = " meta-virt-hosts"
 
 HOSTTOOLS_NONFATAL += "getent"
 
+# Propagate virtualization/vcontainer to native DISTRO_FEATURES for qemu virtfs support
+# This enables virtio-9p in qemu-system-native for container-cross-install batch imports
+DISTRO_FEATURES_NATIVE:append = " ${@bb.utils.contains_any('DISTRO_FEATURES', 'vcontainer virtualization', 'virtualization', '', d)}"
+
 NON_MULTILIB_RECIPES:append:x86-64 = " kubernetes"