Comment 0 for bug 1638334

Steps to reproduce in an amd64 VM using amd64 RC2 from http://cdimage.ubuntu.com/ubuntu-core/xenial/daily-preinstalled/current/:

(grab ./mir-client_0.24.1_amd64.snap from https://code.launchpad.net/~kgunn72/+snap/mir-client)

1. install mir-libs:
$ sudo snap install mir-libs --edge
$ snap interfaces|grep mir
mir-libs:mir-libs

2. install mir-kiosk
$ sudo snap install mir-kiosk --edge
$ snap interfaces|grep mir
:opengl mir-kiosk
mir-kiosk:mir -
mir-libs:mir-libs mir-kiosk

3. install mir-client
$ sudo snap install --dangerous ./mir-client_0.24.1_amd64.snap
$ snap interfaces|grep mir:
opengl mir-client,mir-kiosk
mir-kiosk:mir mir-client
mir-libs:mir-libs mir-kiosk

At this point, 'snap interfaces' output is correct and everything should be auto-connected. The mir-client (plug side) has the expected policy:

$ grep 'label="snap.mir-kiosk' /var/lib/snapd/apparmor/profiles/snap.mir-client.client-start
unix (receive, send) type=seqpacket addr=none peer=(label="snap.mir-kiosk.mir-kiosk"),

However, the the mir-kiosk (slot side) does not have the expected policy:

$ grep 'label="snap.mir-kiosk' /var/lib/snapd/apparmor/profiles/snap.mir-client.client-start
unix (receive, send) type=seqpacket addr=none peer=(label="snap.mir-kiosk.mir-kiosk"),

WORKAROUND: disconnect and connect the interface manually:

$ sudo snap disconnect mir-client:mir mir-kiosk:mir
$ sudo snap connect mir-client:mir mir-kiosk:mir
$ grep 'label="snap.mir-kiosk' /var/lib/snapd/apparmor/profiles/snap.mir-client.client-start
unix (receive, send) type=seqpacket addr=none peer=(label="snap.mir-kiosk.mir-kiosk"),

Additional information:
$ snap list
Name Version Rev Developer Notes
core 16.04.1 324 canonical -
mir-client 0.24.1 x1 -
mir-kiosk 0.1 1 albaguirre -
mir-libs 0.1 1 albaguirre -
pc 16.04-0.8 9 canonical -
pc-kernel 4.4.0-45-3 34 canonical -

$ sudo snap download mir-kiosk --edge
$ cat ./mir-kiosk_1.assert
...
type: snap-declaration
format: 1
...
slots:
  mir:
    allow-connection: true

Note, I also adjusted the snap declaration in the store to have:
type: snap-declaration
format: 1
...
slots:
  mir:
    allow-connection: true
    allow-auto-connection: true

and it did not make a difference.