lfs at linux.demon.co.uk
Tue Aug 8 22:57:25 PDT 2000
I was browsing the FHS-2.1 standard. It's rather badly written if
you wish to determine compliance. However there seems to be one clear
non-compliance in LFS and a few other debatable points.
This seems clear:
* /usr/tmp (if present) should be a link to /var/tmp. At present it's
a separate directory. If it's a link, the chmod for /usr/tmp becomes
unnecessary. FHS also says the link could be dropped if not needed.
Is it still needed?
These are debatable points:
* /usr/include/asm should link to /usr/src/linux/include/asm-<arch>
(currently it's just /usr/src/linux/asm in LFS). Note that "make
config" does set asm -> asm-i386, which fixes this. This is compliant
only if "make config" is an essential part of the kernel installation.
I'm not sure.
* There are some missing directories (which are in FHS-2.1, but not
in LFS). For example, /usr/games is not explicitly made, but is
created during the install (it's only got "banner" in it).
I think LFS compliance is probably OK if a listed directory is missing
because there's nothing to put in it.
* The above applies to the missing /opt as well. However, /opt is not
made during installation. (There are some other examples.)
* /usr/var seems to be a contradiction in terms unless it's a static
link into the /var hierarchy (/usr is shareable read-only, /var is
variable data files, i.e. not read-only).
Note however, /usr/var *is* listed in FHS-2.1 if you want to put /usr
and /var in the same partition, separate from the root partition. YUK!
* /usr/etc is not listed in FHS 2.1.
/usr isn't stand-alone - it can only work when mounted on a root
partition with /etc available. The only argument for it seems to
be the "unnecessary" space taken up in a small root partition by the
files in /etc for software in the /usr partition.
* /usr/local should either be empty or contain only the listed directory
- bin, games, include, lib, sbin, share, src.
Currenly it contains a lot more. The arguments above for and against
/usr/etc apply here.
John Phillips john at linux.demon.co.uk
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