blkid -w is ignored... fix the code or the manpage? :)

the blkid manpage says:

-w <writecachefile> Write the device cache to
writecachefile instead of writing it to the default cache file /etc/blkid.tab. If you don’t want to save the cache to the default file, specify /dev/null. If not specified it will be the same file as that given by the -c option.

and yet, since:

http://thunk.org/hg/e2fsprogs/?rev/ad62cded89a8 (I think...)

(2003...) it has been completely ignored.

I have a bug on this, from before my time at Red Hat,
https://bugzilla.redhat.com/show_bug.cgi?id=200191 Bugzilla Bug 200191:
blkid does not rewrite blkid.tab as documented in the man page. ...filed in 2006.

It'd be easy enough to fix, although this might be a library API change, at least if we want to make blkid_get_cache() symmetric with blkid_put_cache(), each taking a filename...

But it's been broken so long, with (few) complaints, is the functionality worth resurrecting, or should I just submit a patch to remove the -w option? :)

Thanks,

-Eric

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