How do I tell what's loading all these snap filesystems?

[Chris Green]

On Sat, Dec 07, 2019 at 03:44:20PM +0000, Colin Watson wrote:
> On Sat, Dec 07, 2019 at 03:07:33PM +0000, Chris Green wrote:
> > I know this pulls in chromium as a snap package and that there's no
> > alternative but there seem to be quite a lot of snap filesystems on my
> > system now.  Are *all* of these a consequence of chromium or is
> > something else using snap that I don't know about?  How can one find
> > out what's using a snap filesystem?
> 
> All the ones you list are a consequence of chromium, yes.  Note that you
> can use "df -x squashfs" if you just want less noise in df output.
> 
> >     /dev/loop0            55     55         0 100% /snap/core18/1265
> >     /dev/loop1            45     45         0 100% /snap/gtk-common-themes/1353
> >     /dev/loop2           154    154         0 100% /snap/chromium/958
> >     /dev/loop3            23     23         0 100% /snap/snapd/5306
> [...]
> >     /dev/loop4            55     55         0 100% /snap/core18/1279
> >     /dev/loop5            23     23         0 100% /snap/snapd/5643
> > 
> > So, obviously, chromium accounts for /snap/chromium/958 and the snap
> > daemon accounts for /snap/snapd/5306 (but why is there also
> > /snap/snapd/5643?).
> 
> snapd keeps some old versions around so that "snap revert" can work.
> 
> > However what's using those other /snap filesystems, two of them with
> > core18 in the name and /snap/gtk-common-themes/1353?  Is there any way
> > of finding out, from the filesystem name, what package/software is
> > creating them?
> 
> chromium is built with the core18 snap as its base, and connects to
> gtk-common-themes.  "snap info --verbose chromium" will show you "base:
> core18" among its output, and you should see gtk-common-themes mentioned
> in the output of "snap connections".
> 
Brilliant, thank you!  You (and Oli) have told me all I wanted to know.

-- 
Chris Green