[Bug 1640514] Re: /snap/bin is not added to the PATH when using zsh

[Jakub Kuczys]

This is still a problem on Ubuntu 22.04 (jammy). I'm experiencing this problem on Kubuntu 22.04 with the standard KDE + SDDM but I did not experience this issue when I installed (on that same Kubuntu) GNOME and switched my display manager to GDM3 while installing it. It seems that KDE + GDM3 also works while GNOME + SDDM does not.
It appears that SDDM doesn't currently import user session environment from systemd: https://github.com/sddm/sddm/issues/1276

PATH gets properly imported because snap uses a system environment
generator (systemd.environment-generator). However, this environment
generator only updates PATH, not XDG_DATA_DIRS. I'm not sure if system
environment generator should alter XDG_DATA_DIRS (from my testing it
seems that flatpak updates XDG_DATA_DIRS using both system and user
environment generator) but snap could definitely use a user environment
generator to do that.

The necessary code is pretty much already there because snap does have a
system environment generator and user environment generator works in the
exact same way. There might be some special handling needed for
XDG_DATA_DIRS (since the environment.d/990-snapd.conf does
`${XDG_DATA_DIRS:-/usr/local/share:/usr/share}` rather than just
`$XDG_DATA_DIRS`) specifically but I imagine it probably wouldn't be too
complicated.

** Bug watch added: github.com/sddm/sddm/issues #1276
   https://github.com/sddm/sddm/issues/1276

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https://bugs.launchpad.net/bugs/1640514

Title:
  /snap/bin is not added to the PATH when using zsh

Status in Snappy:
  Fix Released
Status in snapd package in Ubuntu:
  Confirmed
Status in zsh package in Ubuntu:
  Invalid
Status in snapd source package in Xenial:
  Confirmed
Status in zsh source package in Xenial:
  Invalid
Status in snapd source package in Bionic:
  Fix Released
Status in zsh source package in Bionic:
  Invalid

Bug description:
  --- Environment ---
  Ubuntu Zesty 17.04 (dev)
  zsh
  snapd 2.16

  --- Description ---
  zsh does not seem to load the scripts in /etc/profile.d/ (see https://bugzilla.redhat.com/show_bug.cgi?id=88457 ).
  As a consequence, /snap/bin is not added to PATH, and running snaps from terminal (without snap run) does not work

  --- How to reproduce ---
  1) Install zsh
  2) try running apps provided by snaps from the shell, without using snap run

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