xlat.in

[Dmitry V. Levin]

Hi,

On Fri, Sep 19, 2014 at 06:30:09PM -0700, enh wrote:
> how do i regenerate an xlat .in file from a uapi header file? i notice
> that fsmagic.in is very out of date.

fsmagic.in differs from most of other xlat files: it doesn't rely on
macros provided by linux kernel headers because there was no
<linux/magic.h> before linux 2.6.19.  We can either continue or end this
practice.

In the former case, the script to regenerate fsmagic.in is likely to be this:
$ sed -rn 's/^#define[[:space:]]+([^[:space:]]+)[[:space:]]+(0x[^[:space:]]+).*/\t{\2,\t"\1"\t},/p' include/uapi/linux/magic.h |sort -u -k2,2

In the latter case, a bit shorter script would do:
$ sed -rn 's/^#define[[:space:]]+([^[:space:]]+)[[:space:]]+(0x[^[:space:]]+).*/\2\t\1/p' include/uapi/linux/magic.h |sort -u -k1,1 |cut -f2
(preceded by #include <linux/magic.h>)

The "sort -u -k" is required to get rid of EXT2/3/4 duplications.

I'm slightly more inclined to choose a conservative approach.


-- 
ldv
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