### Bug Description Now that charms are beginning to be upgraded to use charmcraft 3, I want to have charmcraft v2 and v3 installed so I can work with all the charms I need to. I tried to do this for the snap using the "parallel installs" feature: ``` sudo snap install charmcraft --channel latest/stable --classic sudo snap install charmcraft_3 --channel 3.x/beta --classic ``` But this failed (see logs section). It appears that charmcraft is trying to access a hardcoded path that doesn't exist on the parallel install? ### To Reproduce 1. install charmcraft 2 and 3 snaps with the parallel install feature (note the underscore postfix): ``` sudo snap install charmcraft --channel latest/stable --classic sudo snap install charmcraft_3 --channel 3.x/beta --classic ``` 2. try to use `charmcraft_3` to build a charm. ### Environment Ubuntu 24.04 LTS ### charmcraft.yaml ```shell type: charm parts: charm: plugin: dump source: . base: ubuntu@24.04 platforms: amd64: build-on: amd64 build-for: amd64 arm64: build-on: arm64 build-for: arm64 ppc64el: build-on: ppc64el build-for: ppc64el s390x: build-on: s390x build-for: s390x ``` ### Relevant log output ```shell # here I already have charmcraft 2.7 installed: $ sudo snap install charmcraft --channel latest/stable --classic --- $ sudo snap install charmcraft_3 --channel 3.x/beta --classic charmcraft_3 (3.x/candidate) 3.1.1 from Canonical✓ installed Channel 3.x/beta for charmcraft_3 is closed; temporarily forwarding to 3.x/candidate. $ charmcraft_3 -v pack Starting charmcraft, version 3.1.1 Logging execution to '/home/ubuntu/.local/state/charmcraft/log/charmcraft-20240730-111057.635886.log' Launching managed ubuntu 24.04 instance... Creating new instance from remote Creating new base instance from remote Creating new instance from base instance Starting instance Starting charmcraft version 2.7.1 Logging execution to '/tmp/charmcraft.log' Bad charmcraft.yaml content: - extra field 'base' not permitted in top-level configuration - extra field 'platforms' not permitted in top-level configuration Failed to execute charmcraft in instance. Full execution log: '/home/ubuntu/.local/state/charmcraft/log/charmcraft-20240730-111057.635886.log' $ sudo snap remove charmcraft charmcraft removed $ charmcraft_3 -v pack Starting charmcraft, version 3.1.1 Logging execution to '/home/ubuntu/.local/state/charmcraft/log/charmcraft-20240730-112715.840030.log' Launching managed ubuntu 24.04 instance... Creating new instance from remote Creating new base instance from remote charmcraft internal error: HTTPError('404 Client Error: Not Found for url: http+unix://%2Frun%2Fsnapd.socket/v2/snaps/charmcraft') Full execution log: '/home/ubuntu/.local/state/charmcraft/log/charmcraft-20240730-112715.840030.log' $ sudo snap remove charmcraft_3 charmcraft_3 removed $ sudo snap install charmcraft --channel 3.x/beta --classic charmcraft (3.x/candidate) 3.1.1 from Canonical✓ installed Channel 3.x/beta for charmcraft is closed; temporarily forwarding to 3.x/candidate. $ charmcraft clean $ charmcraft -v pack Starting charmcraft, version 3.1.1 Logging execution to '/home/ubuntu/.local/state/charmcraft/log/charmcraft-20240730-114924.278890.log' Launching managed ubuntu 24.04 instance... Creating new instance from remote Creating new base instance from remote Creating new instance from base instance Starting instance Starting charmcraft, version 3.1.1 Logging execution to '/tmp/charmcraft.log' Starting charmcraft, version 3.1.1 Logging execution to '/tmp/charmcraft.log' Initialising lifecycle Installing build-packages Pulling charm Building charm :: + cp --archive --link --no-dereference . /root/parts/charm/install Staging charm Priming charm Packing... Packing charm ceph-osd_amd64.charm Packed ceph-osd_amd64.charm ```