tests: new test to check interfaces after reboot the system

[sergiocazzolato]

This is created to cover this bug https://bugs.launchpad.net/snapd/+bug/1721518

[codecov-io]

Codecov Report

Merging #4078 into master will increase coverage by 1.73%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4078      +/-   ##
==========================================
+ Coverage   76.19%   77.92%   +1.73%     
==========================================
  Files         445      446       +1     
  Lines       38773    30820    -7953     
==========================================
- Hits        29542    24016    -5526     
+ Misses       7217     4793    -2424     
+ Partials     2014     2011       -3

Impacted Files	Coverage Δ
cmd/snap-repair/cmd_list.go	80% <0%> (-7.18%)	⬇️
cmd/snap-repair/trusted.go	66.66% <0%> (-4.77%)	⬇️
polkit/pid_start_time.go	66.66% <0%> (-4.31%)	⬇️
cmd/snap-update-ns/freezer.go	52.17% <0%> (-4.08%)	⬇️
snap/snaptest/snaptest.go	46.87% <0%> (-3.78%)	⬇️
release/uname_linux.go	71.42% <0%> (-3.58%)	⬇️
interfaces/mount/entry.go	63.93% <0%> (-3.48%)	⬇️
interfaces/connection.go	65% <0%> (-3.34%)	⬇️
cmd/snap/notes.go	76.05% <0%> (-2.9%)	⬇️
arch/arch.go	45.09% <0%> (-2.73%)	⬇️
... and 373 more

---

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[zyga]

+1

[mvo5]

Thanks for taking this on!

[zyga]

Please check $SPREAD_REBOOT and don't do reboot forever.

[sergiocazzolato]

@zyga change applied, thanks for reviewing

[stolowski]

+1

[sergiocazzolato]

@mvo5 @zyga @stolowski, I see the test is failing and aparently it is because of the bug.
After the reboot I see:

• snap interfaces
  error: no interfaces found

[zyga]

Hmm, so indeed the test shows that after reboot we have no interfaces at all:

+ snap interfaces
error: no interfaces found

[zyga]

Two comments to understand this better.

[zyga]

Can you please add:

debug: |
    snap list

[zyga]

Can you please move CONNECTED_PATTERN=":core-support +core:core-support-plug" above and then add the same test after the snap is installed but before we reboot? snap interfaces | MATCH "$CONNECTED_PATTERN"

[sergiocazzolato]

@zyga, I see this when I debug it, does it help?

linode:ubuntu-16.04-64 .../tests/regression/lp-1721518# sudo test-snapd-tools.echo pwpw
cannot perform operation: mount --rbind /dev /tmp/snap.rootfs_DS6k3C//dev: No such file or directory

linode:ubuntu-16.04-64 .../tests/regression/lp-1721518# ls -al /tmp/
total 48
drwxrwxrwt 11 root root 4096 Nov 30 02:31 .
drwxr-xr-x 25 root root 4096 Nov 30 02:16 ..
drwxrwxrwt  2 root root 4096 Nov 30 02:17 .font-unix
drwxrwxrwt  2 root root 4096 Nov 30 02:17 .ICE-unix
drwx------  2 root root 4096 Nov 30 02:30 snap.rootfs_PA6OXy
drwx------  2 root root 4096 Nov 30 02:31 snap.rootfs_PqQb20
drwx------  3 root root 4096 Nov 30 02:17 systemd-private-de4dce0fc42544b18001d55aaec4948c-colord.service-H5suY6
drwx------  3 root root 4096 Nov 30 02:17 systemd-private-de4dce0fc42544b18001d55aaec4948c-systemd-timesyncd.service-Pi8Kft
drwxrwxrwt  2 root root 4096 Nov 30 02:17 .Test-unix
-rw-------  1 root root 2176 Nov 30 02:17 tmp.bnpHqcN6wt
drwxrwxrwt  2 root root 4096 Nov 30 02:17 .X11-unix
drwxrwxrwt  2 root root 4096 Nov 30 02:17 .XIM-unix