Fix hanging test when executed outside tox.

Convert README from markdown to ReST to make it embeddable in
docs/index.rst

The CRAN lister improvements introduced in 91e4e33d originally used pyreadr
to read a RDS file from Python instead of rpy2.

As swh-lister was still packaged for debian at the time, the choice of using
rpy2 instead was made as a debian package is available for it while it is not
for pyreadr.

Now debian packaging was dropped for swh-lister we can reinstate the pyreadr
based implementation which has the advantages of being faster and not depending
on the R language runtime.

Related to swh/meta#1709.

Antoine Lambert authored 1 year ago and Antoine R. Dumont committed 1 year ago

That fails the current loader ingestion as this must be an exact value (when provided,
it's checked against the download operation).

Refs. swh/infra/sysadm-environment#4746

Display the number of processed pages and listed origins after the
listing process ended.

In order to simplify the testing of listers, allow to call the run command
of swh-lister CLI without scheduler configuration. In that case a temporary
scheduler instance with a postgresql backend is created and used.

It enables to easily test a lister with the following command:

$ swh -l DEBUG lister run <lister_name> url=<forge_url>

The implementation of `HTTPError` in `requests` does not guarantee that
the `response` property will always be set. So we need to ensure it is
not `None` before looking for the return code, for example.

This also makes mypy checks pass again, as `types-request` was updated
in 2.31.0.9 to better match this particular aspect. See:
https://github.com/python/typeshed/pull/10875

Ensure the registry path does not exists before cloning the repository.

This module introduce Julia Lister.
It retrieves Julia packages origins from the Julia General Registry, a Git
repository made of per package directory with Toml definition files.

Similar to cgit, it exist cases where git clone URLs for projects hosted
on a gitweb instance cannot be found when scraping project pages or cannot
be easily derived from the gitweb instance root URL.

So add an optional base_git_url parameter enabling to compute correct clone
URLs by appending project names to it.

Some gitweb instances can have some string prefixes before the displayed
git clone URLs so ensure to strip them to properly extract URLs.

Related to swh/infra/sysadm-environment#5051.

rstrip is not a method to remove a string suffix so use another
way to extract gitweb project name.

It fixes the computation of some gitweb origin URLs.

Related to swh/infra/sysadm-environment#5050.

Extra Packages for Enterprise Linux is a set of additional packages
community maintained that can be installed on many Red Hat based
distributions.

This reverts commit c9e2339a

Add a dlang module that retrieve origins from an http api endpoint.
Each origin is a git based project url on github.com, gitlab.com or
bitbucket.com.

Ensure that all lister classes have the same set of mandatory parameters
in their constructors, notably: scheduler, url, instance and credentials.

Add a new test checking listers classes have mandatory parameters declared
in their constructors. The purpose is to avoid deployment issues on staging
or production environment as celery tasks can fail to be executed if mandatory
parameters are not handled by listers.

Reated to swh/infra/sysadm-environment#5030.

Refs. swh/infra/sysadm-environment#5030

This got detected when working on the deployment of the new loader-git.

Refs. swh/infra/sysadm-environment#5017

Previously, the lister was relying on the use of the CRANtools R module
but it has the drawback to only list the latest version of each registered
package in the CRAN registry.

In order to get all possible versions for each CRAN package, prefer to exploit
the content of the weekly dump of the CRAN database in RDS format.

To read the content of the RDS file from Python, the rpy2 package is used as
it has the advantage to be packaged in debian.

Related to swh/meta#1709.

As Red Hat based linux distributions share the same type of package repository,
rework the fedora lister into a generic one to list RPM source packages and
their versions from numerous distributions.

For a given distribution, the RPM lister will fetch packages metadata from a
list of release identifiers and a list of software components. Source packages
are then processed and relevant info are extracted to be sent to the RPM loader.
When all releases and components were processed, the lister collected all versions
for each package name and send those info to the scheduler that will create RPM
loading tasks afterwards.

Nevertheless, as there is no generic way to list all releases and components for
a given distribution but also to guess the right URL to retrieve packages metadata
from, those info need to be manually provided to the lister as input parameters.
Some examples of those parameters for various distributions can be found in the
config directory of the lister.

Regarding the produced origin URLs, as there is no way to find valid HTTP ones
for all distributions, the same behavior as with the debian lister is used and
they have the following form: rpm://{instance}/packages/{package_name} where
the instance variable corresponds to the name of the listed distribution such
as Fedora, CentOS, or openSUSE.

Related to swh/meta#5011.

The constructor allows it but not the celery task.

This also aligns the behavior with other lister tasks.

The constructor allows it but not the celery task.

This also aligns the behavior with other lister tasks.

Instead of sending one page with all origins listed which is britle.
When something goes wrong during the listing, the lister currently records nothing.