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Various fixes + cleanup.

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- Add parts.rst documentation for Linux kernel.
- Completely fix problems caused by new bootstrap, update checksums for
  /usr.
- Globalise populate_device_nodes.
- Enable deblobbing.
This commit is contained in:
fosslinux 2021-08-05 22:16:19 +10:00
parent d429c48d76
commit 04180f5672
48 changed files with 438 additions and 342 deletions
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parts.rst
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@ -566,6 +566,48 @@ Linux kernel without a manual restart from within a running system. It is a
kind of soft-restart. It is only built for non-chroot mode, as we only use it
in non-chroot mode. It is used to go into sysb/sysc.
create_sysb
===========
The next step is not a package, but the creation of the sysb rootfs, containing
all of the scripts for sysb (which merely move to sysc). Again, this is only
done in non-chroot mode, because sysb does not exist in chroot mode.
Linux kernel 4.9.10
===================
A lot going on here. This is the first (and currently only) time the Linux kernel
is built. Firstly, Linux kernel version 4.9.x is used because newer versions
require much more stringent requirements on the make, GCC, binutils versions.
However, the docs are also wrong, as the latest of the 4.9.x series does not
work with our version of binutils. However, a much earlier 4.9.10 does
(selected arbitarily, could go newer but did not test), with a small amount
of patching. This is also modern enough for most hardware and to cause few
problems with software built in sysc. Secondly, the linux-libre scripts are used
to deblob the kernel. Unauditable, unbootstrappable binary blobs within our
kernel are unacceptable. Our gawk is too buggy/old so we use sed instead for
this operation. Every other pregenerated file is appended with ``_shipped`` so
we use a ``find`` command to remove those, which are automatically regenerated.
The kernel config was originally taken from Void Linux, and was then modified
for the requirements of live-bootstrap, including compiler features, drivers,
and removing modules. Speaking of which, modules cannot be used. These cannot
be transferred to subsequent systems, and we do not have ``modprobe``. Lastly,
the initramfs of sysb is generated in this stage, using ``gen_init_cpio`` within
the Linux kernel tree. This avoids the compilation of ``cpio`` as well.
go_sysb
=======
This is the last step of sysa, run for non-chroot mode. It uses kexec to load
the new Linux kernel into RAM and execute it, moving into sysb.
sysb
====
sysb is purely a transition to sysc, allowing binaries from sysa to get onto a
disk (as sysa does not nessecarily have hard disk support in the kernel).
It populates device nodes, mounts sysc, copies over data, and executes sysc.
bash 5.1
========