Re: Possible to undo subvol delete?

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On Wed, Dec 03, 2014 at 02:54:14PM -0500, Zygo Blaxell wrote:
> > Even with the tty/interactive shell detection in place? Maybe I
> > understood the reference to lvm/mdadm tools wrong. My idea is that the
> > scripts would work as now, no prompts there.
> 
> How do we reliably distinguish between
> "running in a script interactively",
> "running in a script non-interactively",
> and "running interactively"?

The first choice is to use isatty() function, but this would not be
enough to detect #1, which would require an extra option to force the
itneractive mode.

> I could easily run a script from the command line that creates and
> destroys subvols and runs for days or weeks (in fact, I quite often do).
> It would be a significant productivity hit if an upgrade made it stop
> every night waiting for confirmation from a user who went home hours
> ago and won't be back for hours more.

Yeah, we want to avoid such surprises. Besides isatty, there could be
more shell magic to detect the interactive mode reliably, I don't know.
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