[Bug 1771858] Re: /snap/bin not in default PATH for units, snapd should ship system-environment-generators to inject /snap/bin into $PATH

[Dimitri John Ledkov]

** Changed in: systemd (Ubuntu Bionic)
       Status: Confirmed => In Progress

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Title:
  /snap/bin not in default PATH for units, snapd should ship system-
  environment-generators to inject /snap/bin into $PATH

Status in snapd package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Fix Released
Status in snapd source package in Xenial:
  Confirmed
Status in systemd source package in Xenial:
  Confirmed
Status in snapd source package in Bionic:
  Confirmed
Status in systemd source package in Bionic:
  In Progress
Status in snapd source package in Cosmic:
  Confirmed
Status in systemd source package in Cosmic:
  Fix Released

Bug description:
  This means that software installed via snap isn't transparently
  available for units to use.  As snaps are first-class citizens in
  Ubuntu, we should update the PATH.

  Specifically, this is evident by e.g. $ systemd-run env. Or any other
  daemons that spawn shell scripts (e.g. cloud-init metadata acquired
  shell hooks, etc.).

  Since v232 systemd provides support for environment generators, snapd
  should package/ship a snippet that injects the correct snapd path into
  systemd environment.

  E.g.:

  $ sudo mkdir -p /usr/lib/systemd/system-environment-generators
  $ printf '#!/bin/sh\nPATH=$PATH:/snap/bin\n' | \
  sudo tee /usr/lib/systemd/system-environment-generators/90-snapd

  Something similar can be done for user-environment-generators too.
  Note that user-environment-generators can generate unique variables
  per user.

  Note please use /usr/lib path, as it appears that /lib/systemd path is
  not working atm. Will check if that needs to be fixed up.

  systemd in xenial does not support system-environment-generators, thus
  we probably need to upload a patch to change the DEFAULT_PATH compiled
  in default there.

  [Testcase]

  $ systemd-run /usr/bin/env
  $ journalctl -e | grep PATH

  Output should contain /snap/bin

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