| /* | |
| * run-init implementation for busybox | |
| * | |
| * Copyright (c) 2017 Denys Vlasenko <vda.linux@gmail.com> | |
| * | |
| * Licensed under GPLv2, see file LICENSE in this source tree. | |
| */ | |
| //config:config RUN_INIT | |
| //config: bool "run-init (7.7 kb)" | |
| //config: default y | |
| //config: select PLATFORM_LINUX | |
| //config: help | |
| //config: The run-init utility is used from initramfs to select a new | |
| //config: root device. Under initramfs, you have to use this instead of | |
| //config: pivot_root. | |
| //config: | |
| //config: Booting with initramfs extracts a gzipped cpio archive into rootfs | |
| //config: (which is a variant of ramfs/tmpfs). Because rootfs can't be moved | |
| //config: or unmounted, pivot_root will not work from initramfs. Instead, | |
| //config: run-init deletes everything out of rootfs (including itself), | |
| //config: does a mount --move that overmounts rootfs with the new root, and | |
| //config: then execs the specified init program. | |
| //config: | |
| //config: util-linux has a similar tool, switch-root. | |
| //config: run-init differs by also having a "-d CAPS_TO_DROP" option. | |
| /* applet and kbuild hooks are in switch_root.c */ |