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initramfs-debug: add simple init script for debugging

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Add a tiny simple debug script that will mount all available virtual
file systems and then execute a shell.

Signed-off-by: Dmitry Eremin-Solenikov <dmitry_eremin@mentor.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
This commit is contained in:
Dmitry Eremin-Solenikov 2015-04-02 18:23:01 +03:00 committed by Martin Jansa
parent 22990fdc12
commit a94da01779
2 changed files with 45 additions and 0 deletions
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31
meta-initramfs/recipes-bsp/initrdscripts/files/init-debug.sh Normal file
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#!/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
do_mount_fs() {
grep -q "$1" /proc/filesystems || return
test -d "$2" || mkdir -p "$2"
mount -t "$1" "$1" "$2"
}
do_mknod() {
test -e "$1" || mknod "$1" "$2" "$3" "$4"
}
mkdir -p /proc
mount -t proc proc /proc
do_mount_fs sysfs /sys
do_mount_fs debugfs /sys/kernel/debug
do_mount_fs devtmpfs /dev
do_mount_fs devpts /dev/pts
do_mount_fs tmpfs /dev/shm
mkdir -p /run
mkdir -p /var/run
do_mknod /dev/console c 5 1
do_mknod /dev/null c 1 3
do_mknod /dev/zero c 1 5
exec sh </dev/console >/dev/console 2>/dev/console

14
meta-initramfs/recipes-bsp/initrdscripts/initramfs-debug_1.0.bb Normal file
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SUMMARY = "Extremely basic live image init script"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
SRC_URI = "file://init-debug.sh"
S = "${WORKDIR}"
do_install() {
install -m 0755 ${WORKDIR}/init-debug.sh ${D}/init
}
inherit allarch
FILES_${PN} += " /init "