snapcraft: use snapcraft pack instead of snapcraft snap

Signed-off-by: Olivier Gayot <olivier.gayot@canonical.com>

DESIGN.md

@@ -521,7 +521,7 @@ Tests (and lint checks) are run by github actions using lxd.  See
 `.github/workflows/build.yaml` and `./scripts/test-in-lxd.sh` and so
 on.
 
-For "real" testing, you need to make a snap (`snapcraft snap`), mash
+For "real" testing, you need to make a snap (`snapcraft pack`), mash
 it into an existing ISO using `./scripts/inject-subiquity-snap.sh`,
 and boot the result in a VM. There is an even hackier pair of scripts
 (`./scripts/slimy-update-snap.sh` and

README.md

@@ -62,7 +62,7 @@ do this:
 1. Build your change into a snap:
 
    ```
-   $ snapcraft snap --output subiquity_test.snap
+   $ snapcraft pack --output subiquity_test.snap
    ```
 
 2. Grab the current version of the installer:

scripts/kvm-test.py

@@ -306,14 +306,14 @@ def build(ctx):
             with snap_manager('subiquity_test.snap') as snap:
                 if not ctx.args.reuse:
                     run('snapcraft clean --use-lxd')
-                    run(f'snapcraft snap --use-lxd --output {snap} {snapargs}')
+                    run(f'snapcraft pack --use-lxd --output {snap} {snapargs}')
                 assert_exists(snap)
                 livefs_edit(ctx, '--add-snap-from-store', 'core20', 'stable',
                             '--inject-snap', snap)
     elif project == 'ubuntu-desktop-installer':
         with snap_manager('udi_test.snap') as snap:
             run('snapcraft clean --use-lxd')
-            run(f'snapcraft snap --use-lxd --output {snap} {snapargs}')
+            run(f'snapcraft pack --use-lxd --output {snap} {snapargs}')
             assert_exists(snap)
             run(f'sudo ./scripts/inject-snap {ctx.baseiso} {ctx.iso} {snap}')
     else:

scripts/test-this-branch.sh

@@ -6,7 +6,7 @@ cd $(dirname $(dirname $(readlink -f $0)))
 
 sudo apt install -y zsync xorriso isolinux
 
-snapcraft snap --output subiquity_test.snap
+snapcraft pack --output subiquity_test.snap
 urlbase=http://cdimage.ubuntu.com/ubuntu-server/daily-live/current
 distroname=$(distro-info -d)
 isoname="${distroname}"-live-server-$(dpkg --print-architecture).iso