Cannot run Snappy apps with /tmp symlinked - "unable to create tmpdir. errmsg: Permission denied"

[Aaron Hastings]

An annoyingly simple bug. Should be easy to reproduce.

I have my /tmp directory symlinked to a directory in my /home filesystem (/home/foobar/.slash_tmp). Permissions/ownership are root:root and 777 and no other apps or packages misbehave.

Running a Snappy app fails immediately:

foobar@ubuntu~> ubuntu-calculator-app.calculator
unable to create tmpdir. errmsg: Permission denied

If I remove the symlink and create a "real" /tmp directory, everything works as expected. The issue isn't with crossing filesystem boundaries, as creating the symlink to another directory in the "slash" filesystem produces the same result (e.g. "ln -s /test /tmp")

Let me know if I can provide any further information. This is really all I have on this!

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: snap (not installed)
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Wed May 25 21:56:32 2016
InstallationDate: Installed on 2016-04-23 (32 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: snap
UpgradeStatus: No upgrade log present (probably fresh install)

[Aaron Hastings (thecosmicfrog)]

Hi all. Any update on this? Thanks.