Packagemanager.rstudio.com migration broke R buildpack

[Xarthisius]

Bug description

Per https://status.posit.co/ Rstudio-now-Posit PackageManager server was migrated from https://packagemanager.rstudio.com to https://packagemanager.posit.co/. RBuildPack.get_rspm_snapshot_url doesn't handle the redirect properly.

Expected behaviour

r2d outputs Dockerfile to stdout

Actual behaviour

[Repo2Docker] Looking for repo2docker_config in /tmp/a
Picked Local content provider.
Using local repo ..
Traceback (most recent call last):
  File "/home/xarth/codes/jupyterhub/repo2docker/venv/lib/python3.10/site-packages/requests/models.py", line 971, in json
    return complexjson.loads(self.text, **kwargs)
  File "/usr/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.10/json/decoder.py", line 340, in decode
    raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 1 column 5 (char 4)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/xarth/codes/jupyterhub/repo2docker/venv/bin/jupyter-repo2docker", line 33, in <module>
    sys.exit(load_entry_point('jupyter-repo2docker', 'console_scripts', 'jupyter-repo2docker')())
  File "/home/xarth/codes/jupyterhub/repo2docker/repo2docker/__main__.py", line 469, in main
    r2d.start()
  File "/home/xarth/codes/jupyterhub/repo2docker/repo2docker/app.py", line 850, in start
    self.build()
  File "/home/xarth/codes/jupyterhub/repo2docker/repo2docker/app.py", line 799, in build
    print(picked_buildpack.render(build_args))
  File "/home/xarth/codes/jupyterhub/repo2docker/repo2docker/buildpacks/base.py", line 464, in render
    for user, script in self.get_build_scripts():
  File "/home/xarth/codes/jupyterhub/repo2docker/repo2docker/buildpacks/r.py", line 278, in get_build_scripts
    cran_mirror_url = self.get_cran_mirror_url(self.checkpoint_date)
  File "/home/xarth/codes/jupyterhub/repo2docker/repo2docker/buildpacks/r.py", line 241, in get_cran_mirror_url
    return self.get_rspm_snapshot_url(snapshot_date)
  File "/home/xarth/codes/jupyterhub/repo2docker/repo2docker/buildpacks/r.py", line 209, in get_rspm_snapshot_url
    ).json()
  File "/home/xarth/codes/jupyterhub/repo2docker/venv/lib/python3.10/site-packages/requests/models.py", line 975, in json
    raise RequestsJSONDecodeError(e.msg, e.doc, e.pos)
requests.exceptions.JSONDecodeError: Extra data: line 1 column 5 (char 4)

How to reproduce

1. mkdir /tmp/foo
2. echo "r-2022-05-05" > /tmp/foo/runtime.txt
3. jupyter-repo2docker --no-build --debug /tmp/foo
4. See error

Your personal set up

• OS: Linux
• Docker version: 24.0.0
• repo2docker version: 2022.10.0+69.g364bf2e.dirty (dirty cause I already tested a patch)

[pnasrat]

Will there be a release with this fix in soon?