show the snap app size info

[XiaoGuo, Liu]

Currently, we use:

$ snap list

command to show all of the snaps installed on the system. I am thinking whether it is possible to show one more column for the size of the snap. For example, for a Qt app, the installed size could be very big if everything is packaged into a single snap package. If a developer finds the size is too big, maybe he/she will opt to content sharing solution or finding other ways to make the package smaller.

Currently, for me, I am more concerned about my disk usage. If I am going to run out of disk space, I may choose one of the biggest app to remove to free more spaces:)

Thanks & best regards,
XiaoGuo

[Mark Shuttleworth (sabdfl)]

The size calculation is quite rich, since you have older versions of
snaps, and backed-up data to deal with as well. Perhaps we want 'snap
size' which shows something like:

$ snap size
Storage space in MB for snaps, data and backups.

Snap Revisions Size Data Reclaimable Total
foo 3 18 7 14 21
bar 4 5 1 2 6

See 'snap size <foo>' for a detailed breakdown per snap.

$ snap size foo
   Rev Date Snap Data
    23 current 5 MB 1 MB
        2017/01/04 1
        2016/12/01 1
        2016/11/13 1

    20 2016/10/22 10 1
        2016/09/07 1
        2016/05/02 1

    18 2016/03/21 9 1
        2015/08/16 1

common current 16
                         --------
                         25 + 23
TOTAL 47 MB

[Mark Shuttleworth (sabdfl)]

Gack, LP ate my layout. See http://pastebin.ubuntu.com/23917485/ for suggested text layout of 'snap size' output.

[Paweł Stołowski (stolowski)]

Some information is already reported by 'snap info'; we are aware it's limited and it's been requested by users via other channels as well to report more details. This is going to be addressed after some more discussions / agreements.