1# Simple initramfs image artifact generation for tiny images. 2SUMMARY = "Tiny image capable of booting a device." 3DESCRIPTION = "Tiny image capable of booting a device. The kernel includes \ 4the Minimal RAM-based Initial Root Filesystem (initramfs), which finds the \ 5first 'init' program more efficiently. core-image-tiny-initramfs doesn't \ 6actually generate an image but rather generates boot and rootfs artifacts \ 7that can subsequently be picked up by external image generation tools such as wic." 8 9VIRTUAL-RUNTIME_dev_manager ?= "busybox-mdev" 10 11PACKAGE_INSTALL = "initramfs-live-boot-tiny packagegroup-core-boot dropbear ${VIRTUAL-RUNTIME_base-utils} ${VIRTUAL-RUNTIME_dev_manager} base-passwd ${ROOTFS_BOOTSTRAP_INSTALL}" 12 13# Do not pollute the initrd image with rootfs features 14IMAGE_FEATURES = "" 15 16IMAGE_NAME_SUFFIX ?= "" 17IMAGE_LINGUAS = "" 18 19LICENSE = "MIT" 20 21# don't actually generate an image, just the artifacts needed for one 22IMAGE_FSTYPES = "${INITRAMFS_FSTYPES}" 23 24inherit core-image 25 26IMAGE_ROOTFS_SIZE = "8192" 27IMAGE_ROOTFS_EXTRA_SPACE = "0" 28 29# Use the same restriction as initramfs-live-install 30COMPATIBLE_HOST = "(i.86|x86_64|aarch64|arm).*-linux" 31 32python tinyinitrd () { 33 # Modify our init file so the user knows we drop to shell prompt on purpose 34 newinit = None 35 with open(d.expand('${IMAGE_ROOTFS}/init'), 'r') as init: 36 newinit = init.read() 37 newinit = newinit.replace('Cannot find $ROOT_IMAGE file in /run/media/* , dropping to a shell ', 'Poky Tiny Reference Distribution:') 38 with open(d.expand('${IMAGE_ROOTFS}/init'), 'w') as init: 39 init.write(newinit) 40} 41 42IMAGE_PREPROCESS_COMMAND += "tinyinitrd" 43 44QB_KERNEL_CMDLINE_APPEND += "debugshell=3 init=/bin/busybox sh init" 45