TMP_DIR sanity checks are needed

[Fathi Boudra]

l-i-t assumes:
* /tmp is big enough
* /tmp is mounted with dev option

In the case of /tmp is mounted with nodev on a small tmpfs, the image creation will fail:
tmpfs 602M 760K 601M 1% /tmp
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,relatime,size=615748k)

We'll need sanity checks for this use case.

[Milo Casagrande (milo)]

Fathi, do you have any preferences on how to approach this?

I started looking into it, but is a little bit tricky. We need to parse either /etc/mtab or get information out of /sys/ and try to guess if there is a /tmp partition or a tmpfs filesystem mounted. But it looks kind of weak.

Python does not have anything native to get filesystem information, there are some udev bindings (python-pyudev), we might try with those.

[Milo Casagrande (milo)]

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