classic confinement reexec and using the snap command *inside* the snap

[Adam Stokes]

Doing a snap install conjure-up --classic on a fresh 16.04.02 system with snapd 2.25 installed. Causes snapd to update itself to 2.26.9 and breaking classic snap installs that use the "snap" command inside their classic confinement in the process.

This is the forum post related to this bug:

https://forum.snapcraft.io/t/snapd-2-26-9-and-conjure-up-no-longer-work/1348

And the related PR

https://github.com/snapcore/snapd/pull/3598

This was the last post from zyga during the writing of this bug:

```
So I think this is going on:

zyga@fyke:~/go/src/github.com/snapcore/snapd/client$ snap --version
snap 2.26.9
snapd 2.26.9
series 16
ubuntu 16.04
kernel 4.8.0-58-generic
Now let's run a shell of a snap with classic confinement:

zyga@fyke:~/go/src/github.com/snapcore/snapd/client$ snap run --shell conjure-up.lxd
zyga@fyke:~/go/src/github.com/snapcore/snapd/client$ snap --version
snap 2.25
snapd 2.26.9
series 16
ubuntu 16.04
kernel 4.8.0-58-generic
What just happened? We are still in the main mount namespace so /usr/bin/snap is the distro version. We have however set SNAP_DID_REEXEC=1 and SNAP_REEXEC= so subsequent invocations of snap will just run from the distro package and never attempt to re-exec into the core snap.

This means that classic confinement snaps will use the wrong snap, the wrong snap-confine and won't understand snap-seccomp.

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```

[Adam Stokes (adam-stokes)]

I have tested the beta core snap and can confirm conjure-up is able to work again

Thank you,
Adam

[Felipe Alfaro Solana (felipe-alfaro-gmail)]

Not sure if it's related, but with the "core" beta snapd, now conjure-up fails in a mysterious way:

# conjure-up.lxd init
error: Unable to talk to LXD: Get http://unix.socket/1.0: dial unix /var/snap/conjure-up/common/lxd/unix.socket: connect: no such file or directory

[George Kraft (cynerva)]

The beta core snap fixes kubernetes-test.e2e trying to call kubectl, too. Cheers.

[Adam Stokes (adam-stokes)]

Felipe,

Different issue please head over to https://github.com/conjure-up/conjure-up/issues