Comment 4 for bug 1855155

It was expected that the install hook would fail, that's on purpose (from my testing of another bug).

Additionally, this command when it works does not hang:

```
$ time sha1sum /var/lib/snapd/lib/gl/libGL.so.1
f474a86f17c2c9b31ffd974e92dbcbeb4968863f /var/lib/snapd/lib/gl/libGL.so.1

real 0m0.003s
user 0m0.000s
sys 0m0.003s
```

and even if that is denied it still doesn't take long:

```
$ time sha1sum /var/lib/snapd/lib/gl/libGL.so.1
sha1sum: /var/lib/snapd/lib/gl/libGL.so.1: Permission denied

real 0m0.001s
user 0m0.001s
sys 0m0.000s
```