Differential D8033 Diff 29766 swh/lister/aur/__init__.py

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swh/lister/aur/init.py

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				# Copyright (C) 2022 the Software Heritage developers
				# License: GNU General Public License version 3, or any later version
				# See top-level LICENSE file for more information


				"""
				AUR (Arch User Repository) lister
				=================================

				The AUR lister list origins from `aur.archlinux.org`_, the Arch User Repository.
				For each package, there is a git repository, we use the git url as origin and the
				snapshot url as the artifact for the loader to download.

				Each git repository consist of a directory (for which name corresponds to the package name),
				and at least two files, .SRCINFO and PKGBUILD which are recipes for building the package.

				Each package has a version, the latest one. There isn't any archives of previous versions,
				so the lister will always list one version per package.

				As of August 2022 `aur.archlinux.org`_ list 84438 packages. Please note that this amount
				is the total of `regular`_ and `split`_ packages. We take decision to not list packages
				belonging to split packages as they do not have a valid snapshot url.
				The packages amount is 78554 after removing the split ones.
				vlorentzUnsubmitted Done Inline Actions I don't think that's accurate; we do archive split packages, but only their "pkgbase" because that is the only one that actually has source code. vlorentz: I don't think that's accurate; we do archive split packages, but only their "pkgbase" because…
				franckbretAuthorUnsubmitted Done Inline Actions I rephrase it, does it looks ok for you? franckbret: I rephrase it, does it looks ok for you?

				Origins retrieving strategy
				---------------------------

				An rpc api exists but it is recommended to save bandwidth so it's not used. See
				`New AUR Metadata Archives`_ for more on this topic.

				To get an index of all AUR existing packages we download a `packages-meta-v1.json.gz`_
				which contains a json file listing all existing packages definitions.

				Each entry describes the latest released version of a package. The origin url
				for a package is built using `pkgbase` and corresponds to a git repository.

				Note that we list only standard package (when pkgbase equal pkgname), not the ones
				belonging to split packages.

				It takes only a couple of minutes to download the 7 MB index archive and parses its
				content.

				Page listing
				------------

				Each page is related to one package. As its not possible to get all previous
				versions, it will always returns one line.

				Each page corresponds to a package with a `version`, an `url` for a Git
				repository, a `project_url` which represents the upstream project url and
				a canonical `snapshot_url` from which a tar.gz archive of the package can
				be downloaded.

				The data schema for each line is:

				* pkgname: Package name
				* version: Package version
				* url: Git repository url for a package
				* snapshot_url: Package download url
				* project_url: Upstream project url if any
				* last_modified: Iso8601 last update date

				Origins from page
				-----------------

				The lister yields one origin per page.
				The origin url corresponds to the git url of a package, for example
				"https://aur.archlinux.org/{package}.git".

				Additionally we add some data set to "extra_loader_arguments":

				* artifacts: Represent data about the Aur package snapshot to download,
				following :ref:`original-artifacts-json specification <original-artifacts-json>`
				* aur_metadata: To store all other interesting attributes that do not belongs
				to artifacts.

				Origin data example::

				{
				"visit_type": "aur",
				"url": "https://aur.archlinux.org/hg-evolve.git",
				"extra_loader_arguments": {
				"artifacts": [
				{
				"filename": "hg-evolve.tar.gz",
				"url": "https://aur.archlinux.org/cgit/aur.git/snapshot/hg-evolve.tar.gz", # noqa: B950
				"version": "10.5.1-1",
				}
				],
				"aur_metadata": [
				{
				"version": "10.5.1-1",
				"project_url": "https://www.mercurial-scm.org/doc/evolution/",
				"last_update": "2022-04-27T20:02:56+00:00",
				"pkgname": "hg-evolve",
				}
				vlorentzUnsubmitted Not Done Inline Actions why is `"version"` in both? vlorentz: why is `"version"` in both?
				franckbretAuthorUnsubmitted Done Inline Actions Because its the associative key for lines for both dict which is needed for the loader the get the corresponding informations. Btw there will be only one line in the case of aur. I think it's more explicit to keep it as is, but if you want me to remove it, I sure can. franckbret: Because its the associative key for lines for both dict which is needed for the loader the get…
				vlorentzUnsubmitted Not Done Inline Actions nevermind, it's fine vlorentz: nevermind, it's fine
				],
				},

				Running tests
				-------------

				Activate the virtualenv and run from within swh-lister directory:

				pytest -s -vv --log-cli-level=DEBUG swh/lister/aur/tests

				Testing with Docker
				-------------------

				Change directory to swh/docker then launch the docker environment:

				docker-compose up -d

				Then connect to the lister:

				docker exec -it docker_swh-lister_1 bash

				And run the lister (The output of this listing results in “oneshot” tasks in the scheduler):

				swh lister run -l aur

				.. _aur.archlinux.org: https://aur.archlinux.org
				.. _New AUR Metadata Archive: https://lists.archlinux.org/pipermail/aur-general/2021-November/036659.html
				.._packages-meta-v1.json.gz: https://aur.archlinux.org/packages-meta-v1.json.gz
				.. _regular: https://wiki.archlinux.org/title/PKGBUILD#Package_name
				.. _split: https://man.archlinux.org/man/PKGBUILD.5#PACKAGE_SPLITTING
				"""


				def register():
				from .lister import AurLister

				return {
				"lister": AurLister,
				"task_modules": ["%s.tasks" % __name__],
				}