Backport UA services support from core22 to legacy snapcraft. Services are defined in the project yaml under the `ua-services` key. Parameter `--enable-experimental-ua-services` is required if you define UA services. **Note:** This is a baseline implementation that may require improvements in service management, such as keeping track of services that are already enabled to avoid re-enabling them. This will be done in future PRs. Example output: ``` $ snapcraft --ua-token=$MYTOKEN --use-lxd --enable-experimental-ua-services Launching a container. Waiting for container to be ready Waiting for network to be ready... Attaching specified UA token... Enabling default service esm-infra Updating package lists UA Infra: ESM enabled Unable to determine current instance-id This machine is now attached to 'claudio.matsuoka@canonical.com' SERVICE ENTITLED STATUS DESCRIPTION cc-eal yes n/a Common Criteria EAL2 Provisioning Packages esm-infra yes enabled UA Infra: Extended Security Maintenance (ESM) fips yes disabled NIST-certified core packages fips-updates yes disabled NIST-certified core packages with priority security updates livepatch yes n/a Canonical Livepatch service usg yes disabled Security compliance and audit tools NOTICES Operation in progress: ua attach Enable services with: ua enable <service> Account: claudio.matsuoka@canonical.com Subscription: claudio.matsuoka@canonical.com Enabling specified UA services... One moment, checking your subscription first Updating package lists Installing FIPS packages FIPS enabled Please run `apt upgrade` to ensure all FIPS packages are updated to the correct version. Skipping pull figlet (already ran) Skipping build figlet (already ran) Skipping stage figlet (already ran) Skipping prime figlet (already ran) The requested action has already been taken. Consider specifying parts, or clean the steps you want to run again. Snapping | Snapped mytest_0.2_amd64.snap Detaching specified UA token...Detach will disable the following services: fips esm-infra Updating package lists Updating package lists This machine is now detached. ``` Signed-off-by: Claudio Matsuoka <claudio.matsuoka@canonical.com> - [ ] Have you followed the [guidelines for contributing](https://github.com/snapcore/snapcraft/blob/master/CONTRIBUTING.md)? - [ ] Have you signed the [CLA](http://www.ubuntu.com/legal/contributors/)? - [ ] Have you successfully run `make lint`? - [ ] Have you successfully run `pytest tests/unit`? ----- CRAFT-1301