2017-08-21 23:00:01 +05:30
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/*
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* run-init implementation for busybox
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*
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* Copyright (c) 2017 Denys Vlasenko <vda.linux@gmail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config RUN_INIT
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2018-12-28 07:50:17 +05:30
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//config: bool "run-init (7.7 kb)"
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2017-08-21 23:00:01 +05:30
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: The run-init utility is used from initramfs to select a new
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//config: root device. Under initramfs, you have to use this instead of
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//config: pivot_root.
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//config:
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//config: Booting with initramfs extracts a gzipped cpio archive into rootfs
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//config: (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
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//config: or unmounted, pivot_root will not work from initramfs. Instead,
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//config: run-init deletes everything out of rootfs (including itself),
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//config: does a mount --move that overmounts rootfs with the new root, and
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//config: then execs the specified init program.
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//config:
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//config: util-linux has a similar tool, switch-root.
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//config: run-init differs by also having a "-d CAPS_TO_DROP" option.
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/* applet and kbuild hooks are in switch_root.c */
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