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Paweł Sobczak
42840f0f36
initctl switch-root always exits 0, no matter what happens on the
finit side. do_switch_root_api() sends the ACK before switch_root()
has validated anything, so any failure after that point never reaches
the client -- the error only shows up in the log. The runlevel guard
in api_cb() has the same problem: it rejects the request but still
sends an ACK.
Split the validation out of switch_root() into switch_root_precheck()
and run it before the ACK. A failed check now sends a NACK with the
error message, which initctl prints before exiting 1:
initctl switch-root /mnt
switch-root: /mnt is not a mount point
The ACK is only sent once the precheck passes, since after that point
we are committed. On success finit execs the new init and the
connection dies with no reply at all, so initctl treats only an
explicit NACK as failure.
Signed-off-by: Paweł Sobczak <github@fixeq.qzz.io>
Finit is a fast, simple alternative to SysV init and systemd, designed for small and embedded Linux systems. It can also run on desktop and server systems, like finix.
Reverse engineered from the EeePC fastinit
"gaps filled with frog DNA …"
— Claudio Matsuoka
For detailed information, explore our extensive documentation
📚 http://finit-project.github.io
For working examples, see the 🚀 contrib/ section or these tutorials:
- 🛠️ Buildroot embedded Linux,
- 📦 Debian GNU/Linux,
- ⛰️ Alpine Linux, and
- 🌌 Void Linux
Note
Finit can run on various Linux distributions, but the bundled install scripts are examples only. They have been tested on amd64 (x86_64) systems with standard configurations.
For embedded systems, see these Buildroot-based examples: myLinux, Infix, or br2-finit-demo.