Fixes for auto-building system/, part one

See merge request !339

Mira Ressel authored 5 years ago and Max Rees committed 5 years ago

This is required to automatically build fcron.

It is not necessarily true that LOGNAME will match the owner of the tty
to which stdin is connected (sudo, su, ...)

df-symlink tests whether df output is consistent in regards to where
devices are mounted. Specifically, it tries to ensure that if there is a
1:1 mapping of the device ("source") corresponding to the current
directory "." ("target"), then `df --output=source,target .` should be
the same as `df --output=source,target $(df --out=source . | tail -n1)`.
However, this is not necessarily the case in the presence of bind
mounts. For example:

$ df --out=source .
Filesystem
/dev/sda4
$ df --out=source,target /dev/sda4
Filesystem     Mounted on
/dev/sda4      /
$ df --out=source,target .
Filesystem     Mounted on
/dev/sda4      /git

This can be fixed by adding the --all flag to ensure that duplicate
devices are printed, so that the 1:1-checking if statement actually
checks it correctly.