Can install non classic snap with --classic, but classic flag isn't set

[Didier Roche-Tolomelli]

Similarly as you can install confined snap in devmode via --devmode, I tried to do the same for a classic snap (definining confinement: strict).

The snap install successfully, but it's confined, not seeing the classic file system tree.
"snap list" confirms it.

If non classic snap aren't supposed to be installed in classic (which seems to be the case due to wrapper scripts being different in python for instance when the snap is a classic snap: https://github.com/snapcore/snapcraft/pull/1093/files#diff-6ddd7f2a83b2f307ff953c3fb60ae35dR256), snapd should prevents it.

Anyway, non classic snap shouldn't be installed using --classic silently in their default mode (strict/devmode)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: snapd 2.22.3
ProcVersionSignature: Ubuntu 4.4.0-64.85-generic 4.4.44
Uname: Linux 4.4.0-64-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Mar 1 09:29:34 2017
InstallationDate: Installed on 2012-05-28 (1737 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: snapd
UpgradeStatus: Upgraded to xenial on 2014-10-31 (851 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mark Shuttleworth (sabdfl)]

Good catch!

[Alberto Salvia Novella (es20490446e)]

🏑

[Marc Peña (pachulo)]

Something weird is definitely going on in here.

I tried installing KeepassXC snap with "--classic" and even though the "list --all" shows this:

Name Version Rev Developer Notes
core 16-2 1441 canonical -
keepassxc 2.1.3 6 keepassxreboot -
...

Now the "/" that KeepassXC sees is the real one.

The problem is that, even then, I can't access NFS mounted directories.

[Claudio Matsuoka (cmatsuoka)]

@didrocks: installing a non-classic snap with --classic with current snapd issues the following warning. (Using --classic shouldn't override the package confinement, the flag is still ignored but not silently.)

$ snap install word-salad --classic
Warning: flag --classic ignored for strictly confined snap word-salad

word-salad 0.1 from Alan Pope 🐧 (popey) installed

I'll close this bug as fix-released (this was addressed in 2.37), however if you feel this is not a proper solution please reopen.

@pachulo: I can't reproduce the situation you describe (strictly confined snap seeing the real /). If this is still an issue, please open a new bug and it will be investigated.