3/11/2023 0 Comments Xonotic forums scripting![]() ![]() Sometimes this results in path names which require updates due to directory name changes between versions.Įnvironment variables example: Irssi environment: Environment variablesĮnvironment variables are often used in snaps to ensure binaries are able to find loadable modules or libraries which reside inside the snap at runtime. Supported core20 architectures are listed below: architectures:įor potential approaches to maintain an i386 build of a snap, see How best to handle i386 when moving to core20. Publishers who want to move to ‘base: core20’ must drop builds for the i386 architecture since it isn’t unavailable. Snaps that produce i386 builds are supportable for the lifetime of Ubuntu 16.04 LTS or Ubuntu 18.04 LTS when using the core or core18 snaps as the base, but base: core20 does not support the i386 architecture. The architectures keyword defines a set of both build and run architectures: architectures: The best way to resolve these issues is to first build your snap on the destination base system, either via snapcraft or a virtual machine/LXD container, and update each unresolved package in turn with the new equivalents. In the above example, the name of the Perl library package changed due to a version bump. Package name example: Irssi stage-packages: The core18 base will use packages from the Ubuntu 18.04 LTS archive, whereas the core20 base will consume packages from the Ubuntu 20.04 LTS archive, and package names can change between releases. When no base or core is specified, packages from the Ubuntu 16.04 LTS archive are used at build and stage time. The build-packages and stage-packages sections in a snap’s snapcraft.yaml specify which packages need to be incorporated during the build and stage parts of the Parts lifecycle, and described in Build and staging dependencies. See Features incompatible with bases for details. This is because when building a snap with an old base, Snapcraft will operate in compatibility mode.Ĭompatibility mode is essentially a prior (2.43-era) version of Snapcraft, and will lose the functionality of newer releases. Migrating a snap from having no base, or base: core, to core18 or core20, for example, is a more involved process than going from core18 to core20. The most common required changes are described below: The complexity of the migration process is directly linked to both dependencies in the snap’s snapcraft.yaml and the base snap versions being migrated between.Īt its simplest, migrating from one base snap to another requires only that the base keyword is updated: - base: core18īut further changes will most likely be needed, and what these are will depend on the original base and the packages that are bundled alongside the application. ![]() See Base snaps for details on how use and specify them.Įach base snap is built from a corresponding Ubuntu LTS release and migrating a snap from one base to the next gives the snap access to newer packages, extended support, and the latest Snapcraft features, including plugins and extensions. ![]() ![]() They’re transparent to users, but they need to be considered and specified when building a snap. A base snap is a special kind of snap that provides a run-time environment with a minimal set of libraries that are common to most applications. ![]()
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