Bug#1077843: popularity-contest: Have separate column for "installed but no atime"

[Niels Thykier <niels@thykier.net>]

Package: popularity-contest
Version: 1.77
Severity: wishlist
X-Debbugs-Cc: niels@thykier.net

Hi,

The popularity-contest provides the columns `Inst`, `Vote`, `Old`, 
`Recent` and `No Files`.

I feel it would be interesting to see how many are `Old` because the 
system has disabled `atime` on its mount point (either directly or 
because the mount point is read-only). For these systems, you can 
basically never get a `Vote` - at least you will see a `Recent` as I 
understand the current logic.

Therefore, I would like to see popularity-contest track whether the 
mount points would ever update its atime (the mount flags I know of that 
are relevant are `noatime` or `ro`[1]) when popularity-contest tracks 
whether it should count a given file as giving a Vote.

I see this proposal as an alternative to #87619 that does not rely on a 
new dependency (/etc/mtab, /proc/mounts, or `mount` can all provide the 
data)

As far as privacy concerns, it may warrant a configuration toogle. I 
have a minor preference for it being opt-out, but opt-in would be fine 
for me as well.

Best regards,
Niels

[1]: As I understand it, `nodiratime` and `relatime` would both be 
non-issues as programs would still get some `atime` access.