Le 29/04/2015 23:54, Jude Nelson a écrit :
On Wed, Apr 29, 2015 at 5:46 PM, Didier Kryn <k...@in2p3.fr
<mailto:k...@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
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