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run-init: new applet

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function                                             old     new   delta
switch_root_main                                     354     637    +283
drop_usermodehelper                                    -     157    +157
cap_name_to_number                                     -      77     +77
packed_usage                                       31707   31743     +36
applet_names                                        2665    2674      +9
applet_main                                         1544    1548      +4
applet_install_loc                                   193     194      +1
setpriv_main                                         933     928      -5
getcaps                                              131     122      -9
parse_cap                                            117      29     -88
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(add/remove: 3/0 grow/shrink: 5/3 up/down: 567/-102)          Total: 465 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-08-21 19:30:01 +02:00
parent 44b3f2ffbc
commit 200bcc851a
5 changed files with 212 additions and 52 deletions
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27
klibc-utils/run-init.c Normal file
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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"
//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 */