Snap (package manager)
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| Snap (package manager) | |
|---|---|
| Name | Snap |
| Developer | Canonical Ltd. |
| Released | 2014 |
| Latest release version | (see project) |
| Programming language | C++, Go, Python |
| Operating system | Linux distributions |
| License | GPLv3 (core), various |
Snap (package manager) Snap is a software packaging and deployment system created by Canonical Ltd. for Linux-based systems. It provides a format for bundling applications with their dependencies and a runtime environment for installation, updates, and rollback across multiple distributions. Snap aims to simplify distribution for developers and administrators while integrating with services and platforms managed by Canonical and related projects.
Overview
Snap was introduced by Canonical Ltd. as part of a strategy associated with projects such as Ubuntu and initiatives like Ubuntu Core. It contrasts with other package formats developed by entities including Debian, Red Hat, Fedora, SUSE, Arch Linux, and projects like Flatpak and AppImage. The format is integrated into system tooling influenced by efforts from organizations like Launchpad (software) and the ecosystem of cloud and container orchestration including OpenStack and Kubernetes. Key design goals reflected influences from software distribution practices at Google, Microsoft, and Apple.
Architecture and Components
Snap consists of a runtime daemon and a package format. The daemon, often running as a service, interacts with system facilities from systemd and storage backends such as btrfs and ext4. The package format bundles binaries, libraries, and metadata; its metadata references concepts from standards promulgated by organizations like the Freedesktop.org community and tooling influenced by GNU utilities. Supporting components include the snapd service, the snapcraft build tool, and a store maintained by Canonical similar in intent to distribution services like Docker Hub, GitHub, and Launchpad (software). Integration points touch the Linux kernel interfaces and sandboxing primitives that also underpin projects such as SELinux and AppArmor.
Package Creation and Distribution
Developers create packages using snapcraft, a toolchain inspired by build systems like Debian package tooling and continuous integration platforms such as Jenkins and Travis CI. Snapcraft supports plugins and build "parts" that draw on ecosystems represented by Node.js, Python (programming language), Java, Golang, and Rust (programming language). Distribution occurs through the Canonical-operated Snap Store, a centralized repository analogous to Google Play and Apple App Store for desktop/server applications, while also allowing private assertion-based distribution workflows used in enterprise contexts including Amazon Web Services, Microsoft Azure, and Google Cloud Platform. Snap supports transactional updates similar to update mechanisms in CoreOS and NixOS.
Security and Confinement
Snap implements confinement using kernel-level mechanisms and LSMs; it leverages technologies such as AppArmor, namespace isolation akin to approaches in LXC and Docker, and seccomp filtering patterns discussed in security communities like OpenSSL and OpenSSH audits. The model employs interface connections and permissions that echo concepts in Android (operating system) and iOS sandboxes, with assertions managed by Canonical resembling signing models used by GPG and X.509 in other ecosystems. The security stance has been examined relative to projects such as Flatpak and policies from Debian and Red Hat security teams.
Adoption and Use Cases
Snap is used by distributions connected to Canonical, notably Ubuntu flavors, and has been adopted in appliance-style deployments like Ubuntu Core and Internet of Things environments similar to solutions from Raspberry Pi Foundation and ARM Holdings. Vendors and projects including Spotify (service), Microsoft Office efforts on Linux, and developer tools from JetBrains have experimented with or published snaps, paralleling packaging efforts seen in Valve Corporation and Canonical's own cloud offerings. Use cases include desktop application distribution, edge computing exemplified by Edge computing initiatives, and controlled enterprise rollouts comparable to software distribution systems from Red Hat Satellite.
Criticism and Controversies
Snap has been criticized in community discussions involving organizations like Debian and Arch Linux for centralization around the Canonical-operated Snap Store, echoing debates similar to those involving Microsoft and Valve Corporation in other platforms. Technical critiques have compared snapd's resource usage and startup characteristics with packaging systems from Fedora, SUSE, and alternative sandboxing solutions like Flatpak and AppImage. Controversies have touched governance and upstream integration akin to disputes in projects such as systemd and community debates within Ubuntu derivatives. Licensing and distribution policies have drawn scrutiny from groups active in Free Software Foundation discussions and package maintainers in distributions like Debian.