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- /*
- * 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 (8 kb)"
- //config: default y
- //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 */
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