Backup and restore failures "no space left on device"

[Ilia]

@Jamie

This is something we could check at Webmin install time for sure, although I haven’t done it yet. Using another directory is a bit risky because it potentially may not be accessible by non-root users depending on permissions though

@Jamie, no problem, I fixed it in the following commits:

Fix to de-hardcode default temp directory path

Fix to prefer `/var/cache` or `/var/tmp` over `/tmp` for default temp directory

@Jamie

Using another directory is a bit risky because it potentially may not be accessible by non-root users depending on permissions though

And, after checking further, I remembered that there are indeed some cases where the parent directory needs to be writable by the user. So, to my disappointment, we won’t be able to use /var/cache. However, using /var/tmp still solves the original.

Fix to use `/var/tmp`as default temp dir instead of `/var/cache` (not rw by user)

Please let me know if you see any potential issues with these changes, or if we’re good?