Add some warning about low disc space

[Lukas Jirkovsky]

Taken from discussion about bug #2531227:
(nobody) said: wouldn't be appropriate to have some sort of warning about disk
space? Just a suggestion :)

This could be solved by monitoring disc space and when it gets running low pause make process and warn user. Problem is that pausing enblend or enfuse would be quite challenging.

[rew (r-e-wolff)]

This is of course because of BUG #678934 that the error messages when disk space does run out are hard to read.

[Yuv (yuv)]

bug sf-2531227 mentioned above is bug 679083 on Launchpad

[Dipak Chirmade (dipak-chirmade)]

Attached patch could be one solution to warn user if he/she has low disk space. It will be better if we show this warning in some warning-window than progress-log window.

References:
1. Statvfs, http://linux.die.net/man/2/statvfs
2. Getenv, http://manpages.courier-mta.org/htmlman3/getenv.3.html

[tmodes (tmodes)]

You put your code into the unix specific part. But the include is processed for all operating systems.
So this will not work on windows and maybe mac.
Hugin runs on different OS and the code should respect this.

[Dipak Chirmade (dipak-chirmade)]

Please find attached patch which has only gnu/linux specific fix for the time being. Thanks for pointing out the issue! ...

[tmodes (tmodes)]

Implemented in changeset dc699342e456.