`meta_package_manager.managers.zero_install` module¶

class meta_package_manager.managers.zero_install.ZeroInstall[source]¶

Bases: PackageManager

Zero Install is a decentralised, cross-platform installation system.

There is no central registry. A program is identified by the URL of its feed, an XML document its own publisher hosts and signs with their own GPG key, so a package id here is a feed URI rather than a short name. Short names collide freely across publishers: one search for python returns a Python feed from apps.0install.net, another from 0install.de and a third from dispcalgui.hoech.net.

A second identifier sits beside the URI. An application is a pet name the user invents and binds to a feed, which is what destroy and update address. The two identifier spaces are what shape the operation set below.

Initialize cli_errors list.

operation_notes: ClassVar = {'install': 'The `0install add` command takes a pet name and a feed URI, and `mpm` cannot invent one for the user.', 'installed': 'The `0install list` inventory is the set of cached feeds, not the set of installed programs.', 'outdated': 'Nothing reports staleness without acting on it; `update` is the upgrade itself.', 'sync': 'Refreshing is the `--refresh` flag of the commands that resolve a feed, never a command of its own.', 'upgrade': 'A single-package upgrade could never be dispatched: `mpm` resolves the source manager by querying an inventory this manager has none.', 'upgrade_all': 'The tool takes one application or URI per update, and ships no bulk form.'}¶

Per-operation hints rendered in the Notes column of the manager page’s Operations table.

Keyed by the Operations member name, each value is a single short sentence explaining why the manager lacks the operation, or what makes its implementation partial: the pointer a reader needs to judge whether the gap is one they could help close. Each sentence starts with a capital and closes with a period, and starts on a word rather than a code span, so the cell reads standalone beside its row. A blank cell stays silent: a manager documenting nothing documents no gap.

The full rationale never lives here: it belongs in a comment beside the implementing method (or beside this declaration, for an operation with no method to hang it on), so the sentence on the page stays a hint and the code keeps the story. The class docstring follows the same split: it keeps only what a user needs to run the tool day to day, never how mpm wraps it.

Validated by test_operation_notes, which also checks every key matches a real operation: a key outside the enum’s vocabulary would never reach a page.

name: str = 'Zero Install'¶

Return package manager’s common name.

Default value is based on class name.

homepage_url: str | None = 'https://0install.net'¶

Home page of the project, only used in documentation for reference.

Left unset when the home page is the project’s repository, which repository_url names on its own, and when it is the project’s manual, which documentation_url names. Never inherited, like the other links.

documentation_url: str | None = 'https://docs.0install.net/'¶

Entry point of the project’s own documentation, or None when it has none.

The manual, the documentation site, or the man page of the CLI mpm drives: whichever page a user reads to learn the commands this manager wraps. Listed between homepage_url and repository_url in the links of the manager’s page, so a reader reaching for the tool’s reference finds it in the box of facts rather than in the prose below it.

Left unset where a link would state a fact twice or invent one: a tool documenting itself in its repository alone, whose README repository_url already reaches. A page about the ecosystem rather than the tool does not qualify either.

Where a project’s only site is its manual, that address belongs here and homepage_url stays unset: the slot names what the page is, and a reader reaching for the reference looks under the documentation link.

Never inherited, like every other link: the AUR helpers extending pacman each document themselves.

repository_url: str | None = 'https://github.com/0install/0install'¶

Repository holding the project’s code, or None when it has no public one.

Linked from the manager’s documentation page. Also what the weekly metrics sample reads: docs/docs_update.py writes it into the [tool.repomatic.metrics] subjects of pyproject.toml when its forge answers the sampler, through a mirror for a forge that does not.

Never inherited, for the same reason as wikipedia_url: the AUR helpers extending pacman each live in a repository of their own.

platforms: frozenset[Platform] | Group | Platform | Iterable[Platform | Group] = frozenset({Platform(id='aix', name='IBM AIX'), Platform(id='almalinux', name='AlmaLinux'), Platform(id='alpine', name='Alpine Linux'), Platform(id='altlinux', name='ALT Linux'), Platform(id='amzn', name='Amazon Linux'), Platform(id='android', name='Android'), Platform(id='arch', name='Arch Linux'), Platform(id='buildroot', name='Buildroot'), Platform(id='cachyos', name='CachyOS'), Platform(id='centos', name='CentOS'), Platform(id='chromeos', name='ChromeOS'), Platform(id='clearlinux', name='Clear Linux OS'), Platform(id='cloudlinux', name='CloudLinux OS'), Platform(id='crux', name='CRUX'), Platform(id='cygwin', name='Cygwin'), Platform(id='debian', name='Debian'), Platform(id='dragonfly_bsd', name='DragonFly BSD'), Platform(id='endeavouros', name='EndeavourOS'), Platform(id='exherbo', name='Exherbo Linux'), Platform(id='fedora', name='Fedora'), Platform(id='freebsd', name='FreeBSD'), Platform(id='generic_linux', name='Generic Linux'), Platform(id='gentoo', name='Gentoo Linux'), Platform(id='guix', name='Guix System'), Platform(id='haiku', name='Haiku'), Platform(id='hurd', name='GNU/Hurd'), Platform(id='ibm_powerkvm', name='IBM PowerKVM'), Platform(id='illumos', name='illumos'), Platform(id='kali', name='Kali Linux'), Platform(id='kvmibm', name='KVM for IBM z Systems'), Platform(id='linuxmint', name='Linux Mint'), Platform(id='macos', name='macOS'), Platform(id='mageia', name='Mageia'), Platform(id='mandriva', name='Mandriva Linux'), Platform(id='manjaro', name='Manjaro Linux'), Platform(id='midnightbsd', name='MidnightBSD'), Platform(id='netbsd', name='NetBSD'), Platform(id='nixos', name='NixOS'), Platform(id='nobara', name='Nobara'), Platform(id='nutyx', name='NuTyX'), Platform(id='openbsd', name='OpenBSD'), Platform(id='opensuse', name='openSUSE'), Platform(id='openwrt', name='OpenWrt'), Platform(id='oracle', name='Oracle Linux'), Platform(id='os400', name='IBM i'), Platform(id='parallels', name='Parallels'), Platform(id='pidora', name='Pidora'), Platform(id='pikaos', name='PikaOS'), Platform(id='raspbian', name='Raspbian'), Platform(id='rhel', name='RedHat Enterprise Linux'), Platform(id='rocky', name='Rocky Linux'), Platform(id='scientific', name='Scientific Linux'), Platform(id='slackware', name='Slackware'), Platform(id='sles', name='SUSE Linux Enterprise Server'), Platform(id='slitaz', name='SliTaz GNU/Linux'), Platform(id='solaris', name='Solaris'), Platform(id='solus', name='Solus'), Platform(id='sourcemage', name='Source Mage GNU/Linux'), Platform(id='sunos', name='SunOS'), Platform(id='tuxedo', name='Tuxedo OS'), Platform(id='ubuntu', name='Ubuntu'), Platform(id='ultramarine', name='Ultramarine'), Platform(id='void', name='Void Linux'), Platform(id='windows', name='Windows'), Platform(id='wsl1', name='Windows Subsystem for Linux v1'), Platform(id='wsl2', name='Windows Subsystem for Linux v2'), Platform(id='xenserver', name='XenServer')})¶: The OCaml implementation builds for Windows alongside every Unix, and ships the manifest and resource files to prove it under src/windows.

cli_names: tuple[str, ...] = ('0install',)¶

The binary leads with a digit, where the manager id cannot.

Every id doubles as a --<id> selector, and Click derives an option’s Python identifier from that flag, which leaves --0install named by the empty string. So the id follows the project’s own name, Zero Install, and only the binary keeps its digit.

pre_args: tuple[str, ...] = ('--console',)¶

Keeps every call on the terminal.

0install switches to a graphical policy editor whenever it needs the network and DISPLAY is set, so a search run from a desktop session would otherwise open a window and wait for a human.

version_regexes: tuple[str, ...] = ('0install\\s+\\(zero-install\\)\\s+(?P<version>\\S+)',)¶

$ 0install --version
0install (zero-install) 2.18
Copyright (C) 2019 Thomas Leonard
This program comes with ABSOLUTELY NO WARRANTY,
to the extent permitted by law. You may redistribute copies of this program
under the terms of the GNU Lesser General Public License.
For more information about these matters, see the file named COPYING.
Compiled with D-Bus support: false
HTTP client library: libcurl (C)

id: str = 'zeroinstall'¶

Package manager’s ID.

Derived by defaults from the lower-cased class name in which underscores _ are replaced by dashes -.

This ID must be unique among all package manager definitions and lower-case, as they’re used as feature flags for the mpm CLI.

virtual: bool = False¶

Should we expose the package manager to the user?

Virtual package manager are just skeleton classes used to factorize code among managers of the same family.

wikipedia_url: str | None = None¶

English Wikipedia article about the project, or None when it has none.

Listed last in the links of the manager’s documentation page. The article covers the project that home page names, or is a redirect Wikipedia keeps under the project’s name, landing on the part of a broader article that describes it: Cargo_(software) opens the Cargo section of the Rust article. An article that merely mentions the project does not count, nor does one about a related subject: lazy is a Neovim plugin manager, and the Neovim article is not about it.

Never inherited: the metaclass resets it to None on any class not declaring its own. A subclass often wraps a distinct project, like the six AUR helpers extending pacman, and would otherwise present pacman’s article as its own. Documentation-only, like homepage_url.

search(query, extended, exact)[source]¶

Fetch matching packages.

The query goes to the mirror server, which indexes feeds it has been told about. Results carry no version, the mirror indexing feeds rather than the implementations inside them.

Caution

Search does not support extended or exact matching.

$ 0install --console search hello
http://gfxmonk.net/dist/0install/template.xml
  template - A command-line jinja2 template script [100%]

http://gfxmonk.net/dist/0install/python-pyquery.xml
  python-pyquery - A jquery-like library for python [45%]

http://gfxmonk.net/dist/0install/python-argh.xml
  python-argh - An unobtrusive argparse wrapper with natural syntax [38%]

http://gfxmonk.net/dist/0install/should.js.xml
  should.js - should.js [8%]

http://gfxmonk.net/dist/0install/python-colorama.xml
  python-colorama - Cross-platform colored terminal text. [7%]

Return type:: Iterator[Package]

remove(package_id)[source]¶

Remove one package.

destroy takes the pet name alone, the one add created, and deletes the application directory with any launcher script it placed on the user’s path. A feed URI is refused with No such application, so the URIs that search yields are not what this operation consumes.

$ 0install --console destroy zeroinstall

Return type:: str

cleanup_cache()[source]¶

Optimise the implementation cache.

Hard-links files shared by several implementations in the store, so a program kept at more than one version stops paying for each copy.

$ 0install --console store optimise
Optimising /Users/kde/.cache/0install.net/implementations
[0 / 1] Reading manifests...Original size  : 2.1 MB (excluding the 27.9 KB of manifests)
Already saved  : 0 bytes
Optimised size : 2.1 MB
Space freed up : 40 bytes (0.00%)
Optimisation complete.

Return type:: None

meta_package_manager.managers.zero_install module¶

`meta_package_manager.managers.zero_install` module¶