Le 29/04/2015 23:54, Jude Nelson a écrit :
>
> On Wed, Apr 29, 2015 at 5:46 PM, Didier Kryn <kryn@???
> <mailto:kryn@in2p3.fr>> wrote:
>
>
>
> Le 29/04/2015 22:34, Hendrik Boom a écrit :
>
> On Wed, Apr 29, 2015 at 10:47:27AM -0400, Steve Litt wrote:
>
> I'm under the impression you can do most or all of what
> needs to be
> done in the actual init, rather than the initramfs. This
> gets a little
> complicated now that Linux has been "improved" by having /sbin
> and /bin be symlinks to /usr/bin, which might not be
> mounted in early
> boot, but aside from that, I think once you have
> possession of /bin
> and /sbin, then assuming that /etc is not a mountpoint, I
> think most
> other stuff can be delayed til the real init, always
> assuming that it's
> easier to put stuff in the on-disk init than in initramfs.
>
> Is that Linux that has been "improved" by turning /sbin and
> /bin into
> symlinks? Or is it Debian? Or the systemd collection of distros?
>
> -- hendrik
>
> Here's the story I read about /usr, and it sounds like the truth:
>
> When people built the first Unix machine, the first disk,
> containing /bin went full but they needed to add more files to
> /bin . They decided to put them on the second disk which contained
> user data and was therefore mounted at /usr. Hence /usr/bin. It
> was a technical workaround for disk-size limitation.
>
> Nowadays some distros got rid of /usr but still make it a
> symlink to / because of softwares that rely on it. If Debian is
> now doing sort of the opposite, it must be some trick. I've
> nothing against; as long as you keep /usr, use it at your will;
> it's all about convenience tricks.
>
>
> Even these days, in some UNIXes (OpenBSD comes to mind), /bin and
> /sbin differ from /usr/bin and /usr/sbin in that they only contain
> statically-linked programs. This is useful for doing things like
> upgrading the rest of the system, so you have a way to recover from
> catastrophic errors (like /usr or /lib becoming unusable).
> -Jude
That's a very sensible reason; you may have noticed I like static
linking :-) . Another argument is that /usr/bin and /usr/lib are bloated
and may be mounted on a different partition, while basic tools in /bin
and /lib/libc.so, which are needed at startup, are in the root filesystem.
Didier