[Toybox] [PATCH] blkid: adapt tests for util-linux blkid.

[Rob Landley]

On 6/25/19 3:42 PM, enh via Toybox wrote:
> util-linux's blkid doesn't support reading from stdin, so move that to
> being a special toyonly test rather than the default.

Amusingly enough I had a partial version of this change already in my tree. :)

Pity this slows down the tests so much. (Lots of these filesystems are large and
empty.)

> toybox blkid differs from util-linux in that it doesn't seem to find the
> LABEL for the checked-in example f2fs file system (the offset is wrong,
> but also f2fs uses LE16 strings), nor does it support the SEC_TYPE that
> util-linux blkid shows for several of the test file systems.

I need to dig into config stuff to loopback mount f2fs. All the flash
filesystems need a fake flash device that emulates erase blocks. You'd think
/dev/loop would have been modified to do this already with an extra losetup
flag, but no, they did that block2mtd nonsense instead...

Sigh. I should teach MY mount to deal with this crap transparently. (It already
knows how to do "mount file dir" without having to say -o loop. And "mount file
file" and "mount dir dir" without having to say --bind...

Rob

P.S. Because --loop and -o loop are synonyms, that's why. You can even go
--remount,rw but that's an implementation side effect. Well I taught busybox
mount to do that a decade ago, wasn't going to do _less_ in toybox. :)