swh.lister.conda package#


Module contents:

Conda lister#

Anaconda is a package manager that provides tooling for datascience.

The Conda lister list packages from Anaconda repositories. Those repositories host packages for several languages (Python, R) operating systems and architecture. Packages are grouped within free or commercial channels.

To instantiate a conda lister we need to give some channel`and `arch arguments:

lister = CondaLister(
    scheduler=swh_scheduler, channel="free", archs=["linux-64", "osx-64", "win-64"]

The default url value of lister is https://repo.anaconda.com/pkgs. One can set another repository url, for example:

lister = CondaLister(

Origins retrieving strategy#

Each channel provides several repodata.json files that list available packages and related versions.

Given a channel and a list of system and architecture the lister download and parse corresponding repodata.json.

We use bz2 compressed version of repodata.json. See for example main/linux-64 page to view available repodata files.

Page listing#

The lister returns one page per channel / architecture that list all available package versions.

Origins from page#

Origins urls are built following this pattern https://anaconda.org/{channel}/{pkgname}. Each origin is yield with an artifacts entry in extra_loader_arguments that list artifact metadata for each archived package version.

Origin data example for one origin with two related versions.:

    "url": "https://anaconda.org/conda-forge/lifetimes",
    "artifacts": {
        "linux-64/0.11.1-py36h9f0ad1d_1": {
            "url": "https://conda.anaconda.org/conda-forge/linux-64/lifetimes-0.11.1-py36h9f0ad1d_1.tar.bz2",  # noqa: B950
            "date": "2020-07-06T12:19:36.425000+00:00",
            "version": "0.11.1",
            "filename": "lifetimes-0.11.1-py36h9f0ad1d_1.tar.bz2",
            "checksums": {
                "md5": "faa398f7ba0d60ce44aa6eeded490cee",
                "sha256": "f82a352dfae8abceeeaa538b220fd9c5e4aa4e59092a6a6cea70b9ec0581ea03",  # noqa: B950
        "linux-64/0.11.1-py36hc560c46_1": {
            "url": "https://conda.anaconda.org/conda-forge/linux-64/lifetimes-0.11.1-py36hc560c46_1.tar.bz2",  # noqa: B950
            "date": "2020-07-06T12:19:37.032000+00:00",
            "version": "0.11.1",
            "filename": "lifetimes-0.11.1-py36hc560c46_1.tar.bz2",
            "checksums": {
                "md5": "c53a689a4c5948e84211bdfc23e3fe68",
                "sha256": "76146c2ebd6e3b65928bde53a2585287759d77beba785c0eeb889ee565c0035d",  # noqa: B950

Running tests#

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

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

Testing with Docker#

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

docker compose up -d

Then schedule a conda listing task:

docker compose exec swh-scheduler swh scheduler task add -p oneshot list-conda channel="free" archs="[linux-64, osx-64, win-64]"  # noqa: B950

You can follow lister execution by displaying logs of swh-lister service:

docker compose logs -f swh-lister