[Toybox] [PATCH] Fix truncate.test for macOS.

[enh]

On Wed, Jun 22, 2022 at 1:52 PM Rob Landley <rob at landley.net> wrote:

> On 6/20/22 21:32, enh via Toybox wrote:
> > Specifically we were ending up with 2048 blocks allocated, and that --
> > not the stat(1) behavior -- was the reason why this test was failing
> > on macOS.
>
> Yay, I got thunderbird sending email through gmail again! (The version
> upgrade
> changed the authentication type in the smtp server settings, but I could
> still
> set it BACK...)
>
> I wanted a partially sparse file there, which truncate was preserving the
> contents of.


i must be missing something ... why is it _partially_ sparse?


> There's %b and %B which is block size and size per block, and bash
> can do:
>
>   $ x=1+3; echo $((x))
>   4
>
> So what I should probably do is:
>
> X=$(stat -c %B); [ $(($(stat -c %b freep)*X)) -le $((12345+X)) ]]
>
> The problem is, you're not using bash or toysh for these tests, you're
> using a
> shell of unknown capabilities. Can the macos and android shells do that?
>

macos _is_ bash, it's just 3.2.57 from 2007, for exactly the reason you'd
assume.

android is mksh, which is available as a debian package; i often do
"android" shell testing that way for convenience :-)

if you send me a patch i can test it for you ... but feel free to just
commit "the right thing" and we can work from there!


> Rob
>
> P>S. Possibly I should use expr instead? The main reason I hadn't promoted
> expr
> yet, modulo the historical priority issues and that posix bugfix resulting
> from
> me reporting that their html conversion was dropping information about
> priority
> grouping, was that I wanted to see if expr could use the same plumbing as
> $((math)) in the shell. And now that I've got the shell math plumbing
> finished-ish, the answer is that I could probably write a NEW expr using
> that
> plumbing, but the existing one very much not. I dislike the parallel
> string/int
> plumbing in the current expr, and the TWO different enums where we tag a
> structure in order to marshall data to ourselves... Hmmm...
>
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