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* maint:
Fix disksup:get_disksup_data() for High Sierra
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On macOS 10.13 (High Sierra), disksup cannot grab information
for any disks that use the new APFS file system. The reason
is that the invocation of /bin/df explicitly limits the
type of file systems to show:
/bin/df -i -k -t ufs,hfs
Add 'apfs' to also look at disks with APFS:
/bin/df -i -k -t ufs,hfs,apfs
That also works on older versions of macOS.
An alternative solution would be to use the -l flag to only
show local file systems. However, that would mean that USB
memory sticks would also show up, and it might not be desirable
to monitor them.
https://bugs.erlang.org/browse/ERL-461
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Tests for disksup:parse_df
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On embedded (Linux) systems the "df" program is very often provided by
the Busybox (or Toolbox) project. This version does not provide the "-l"
option (for displaying only local filesystems) used in disksup.erl.
To make disksup work on these embedded platforms, this patch adds a new
application parameter 'disksup_posix_only', to make diskup use only
options defined in the POSIX standard:
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/df.html
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Use 'df -k -l' to query OpenBSD about diskspace on local disks.
Same reasoning as for FreeBSD - additional filesystems without
listing them all.
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Use 'df -k -l' to query FreeBSD about diskspace on local disks.
Previously 'df' -k -t ufs' was used but this will not handle zfs
disks. Just use '-l' instead of listing potential filesystems.
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On OS X Mountain Lion, the default output of df command includes iNode
used and iNodes free, which apparent what SUSv3 specifies. This breaks
the current parse logic and reports incorrect results. This patch adds
support for the new format and ensures older versions of OS X produce
this format by adding the -i switch (which is now the default). Adding
support for this new format rather than changing df output as we'll
presumably see this on other platforms eventually.
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