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Diffstat (limited to 'klibc-utils/run-init.c')
| -rw-r--r-- | klibc-utils/run-init.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/klibc-utils/run-init.c b/klibc-utils/run-init.c new file mode 100644 index 000000000..a70d1bfbf --- /dev/null +++ b/klibc-utils/run-init.c @@ -0,0 +1,27 @@ +/* + * 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 */ |