vcontainer: add tiny initramfs image infrastructure

Add proper Yocto image recipes for the tiny initramfs used by
vdkr/vpdmn in the switch_root boot flow:

- vcontainer-tiny-initramfs-image.inc: Shared image configuration
- vcontainer-preinit_1.0.bb: Preinit script package (shared)
- vdkr-tiny-initramfs-image.bb: Tiny initramfs for vdkr
- vpdmn-tiny-initramfs-image.bb: Tiny initramfs for vpdmn

The tiny initramfs contains only busybox and a preinit script that:
1. Mounts devtmpfs, proc, sysfs
2. Mounts the squashfs rootfs.img from /dev/vda
3. Creates tmpfs overlay for writes
4. Performs switch_root to the real rootfs

This replaces ad-hoc file extraction with proper image-based builds,
improving reproducibility and maintainability.

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

1 files changed, 3 insertions, 3 deletions

diff --git a/recipes-containers/vcontainer/files/vdkr-preinit.sh b/recipes-containers/vcontainer/files/vcontainer-preinit.sh
index 08738022..6f1b7e09 100644
--- a/recipes-containers/vcontainer/files/vdkr-preinit.sh
+++ b/recipes-containers/vcontainer/files/vcontainer-preinit.sh
@@ -3,7 +3,7 @@
 #
 # SPDX-License-Identifier: GPL-2.0-only
 #
-# vdkr-preinit.sh
+# vcontainer-preinit.sh
 # Minimal init for initramfs - mounts rootfs and does switch_root
 #
 # This script runs from the initramfs and:
@@ -12,7 +12,7 @@
 # 3. Creates overlayfs with tmpfs for writes
 # 4. Executes switch_root to the overlay root filesystem
 #
-# The real init (/init or /sbin/init on rootfs) then runs vdkr-init.sh logic
+# The real init (/init or /sbin/init on rootfs) then continues boot
 
 # Mount essential filesystems first (needed to check cmdline)
 mount -t proc proc /proc
@@ -31,7 +31,7 @@ log() {
     [ "$QUIET" = "0" ] && echo "$@"
 }
 
-log "=== vdkr preinit (squashfs) ==="
+log "=== vcontainer preinit (squashfs) ==="
 
 # Wait for block devices to appear
 log "Waiting for block devices..."