[systemd-devel] [PATCH] shutdown: add kexec loading, avoid calling `kexec` binary unnessecarily

[Kay Sievers]

On Thu, Mar 12, 2015 at 1:22 AM, Shawn Landden <shawn at churchofgit.com> wrote:
> Still use helper when Xen Dom0, to avoid duplicating some hairy code.
>
> I think the rbtree version was far more understandable as greedy_realloc0()
> is very messy to do correctly.
>
> Take fopenat() from lsof.
> Add opendirat()

We have that in util.c :: xopendirat()

> Future: generate BootLoaderSpec files for other kernel install locations

This approach duplicates, the potentially complex, boot manager kernel
selection logic.

The recent systemd-boot boot loader and efi stub loader which carries
the kernel, the cmdline, the initrd in one single EFI binary will also
not use any boot loader snippets, it will be discovered by the loader
itself, which parses the PE/COFF files and looks for specific content.

The snippets are meant to unify the boot loader *configuration*, but
they do not mean that every bootable kernel will or should have one.
There might be many ways for kernels to be found by the boot loader,
the snippets are just one source for that.

I'm not sure what exact problem this patch tries to solve, but it
generally does not sound right to duplicate the boot loader
selection/discovery/enumeration logic here. I don't really think we
should do that, or will be able to catch with the boot loader up here.

Thanks,
Kay