Stop using MRAN

- remove cutoff for picking RSPM, always use it
- remove now-redundant r4.0-mran test
- shift base R 3.6 snapshot date to after October 2017, when rspm snapshots seem to have started
- update docs to point to RSPM

Author: minrk

docs/source/config_files.rst

@@ -118,7 +118,7 @@ with ``REQUIRE`` and ``environment.yml``, visit
 ================================================
 
 This is used to install R libraries pinned to a specific snapshot on
-`MRAN <https://mran.microsoft.com/documents/rro/reproducibility>`_.
+`Posit Package Manager <https://mran.microsoft.com/documents/rro/reproducibility>`_.
 To set the date of the snapshot add a runtime.txt_.
 For an example ``install.R`` file, visit our `example install.R file <https://github.com/binder-examples/r/blob/HEAD/install.R>`_.
 
@@ -207,7 +207,7 @@ For these cases, we have a special file, ``runtime.txt``.
 Have ``python-x.y`` in ``runtime.txt`` to run the repository with Python version x.y.
 See our `Python2 example repository <https://github.com/binder-examples/python2_runtime/blob/HEAD/runtime.txt>`_.
 
-Have ``r-<RVERSION>-<YYYY>-<MM>-<DD>`` in ``runtime.txt`` to run the repository with R version RVERSION and libraries from a YYYY-MM-DD snapshot of `MRAN <https://mran.microsoft.com/documents/rro/reproducibility>`_.
+Have ``r-<RVERSION>-<YYYY>-<MM>-<DD>`` in ``runtime.txt`` to run the repository with R version RVERSION and libraries from a YYYY-MM-DD snapshot of `Posit Package Manager <https://packagemanager.posit.co/client/#/repos/2/overview>`__.
 RVERSION can be set to 3.4, 3.5, 3.6, or to patch releases for the 3.5 and 3.6 series.
 If you do not specify a version, the latest release will be used (currently R 3.6).
 See our `R example repository <https://github.com/binder-examples/r/blob/HEAD/runtime.txt>`_.

docs/source/howto/languages.rst

@@ -65,17 +65,14 @@ to install libraries from on the given date. You can install more R packages fro
 by adding a :ref:`install.R<install.R>` file to your repo. RStudio and IRKernel are
 installed by default for all R versions.
 
-If you request R 4.1 or later, or specify a snapshot date newer than
-``2022-01-01``, `packagemanager.posit.co <https://packagemanager.posit.co/client/#/>`_
+`packagemanager.posit.co <https://packagemanager.posit.co/client/#/>`_
 will be used to provide much faster installations via `binary packages <https://www.rstudio.com/blog/package-manager-v1-1-no-interruptions/>`_.
 For *some* packages, this might require you install underlying system libraries
 using :ref:`apt.txt` - look at the page for the CRAN package you are interested in at
 `packagemanager.posit.co <https://packagemanager.posit.co/client/#/>`_ to find
 a list.
 
-For older R versions with an older snapshot date, `MRAN <https://mran.microsoft.com/>`_
-is used as source of packages. This purely provides source packages, and you should
-migrate away from this if possible.
+repo2docker stopped using the Microsoft mirror MRAN for older R versions after its shutdown in July, 2023.
 
 
 Julia

repo2docker/buildpacks/r.py

@@ -229,30 +229,10 @@ def get_rspm_snapshot_url(self, snapshot_date, max_days_prior=7):
             )
         )
 
-    @lru_cache()
-    def get_mran_snapshot_url(self, snapshot_date, max_days_prior=7):
-        for i in range(max_days_prior):
-            try_date = snapshot_date - datetime.timedelta(days=i)
-            # Fall back to MRAN if packagemanager.posit.co doesn't have it
-            url = f"https://mran.microsoft.com/snapshot/{try_date.isoformat()}"
-            r = requests.head(url)
-            if r.ok:
-                return url
-        raise ValueError(
-            "No snapshot found for {} or {} days prior in mran.microsoft.com".format(
-                snapshot_date.strftime("%Y-%m-%d"), max_days_prior
-            )
-        )
-
     @lru_cache()
     def get_cran_mirror_url(self, snapshot_date):
         # Date after which we will use rspm + binary packages instead of MRAN + source packages
-        rspm_cutoff_date = datetime.date(2022, 1, 1)
-
-        if snapshot_date >= rspm_cutoff_date or self.r_version >= V("4.1"):
-            return self.get_rspm_snapshot_url(snapshot_date)
-        else:
-            return self.get_mran_snapshot_url(snapshot_date)
+        return self.get_rspm_snapshot_url(snapshot_date)
 
     @lru_cache()
     def get_devtools_snapshot_url(self):

tests/r/r3.6-mran/runtime.txt

@@ -0,0 +1 @@
+r-3.6-2017-11-01

tests/r/r3.6-mran/install.R renamed to tests/r/r3.6-rspm/install.R

@@ -7,7 +7,7 @@ if (!(version$major == "3" && as.double(version$minor) >= 6 && as.double(version
   quit("yes", 1)
 }
 
-# Fail if MRAN isn't the configured CRAN mirror
-if (!(startsWith(options()$repos["CRAN"], "https://mran.microsoft.com"))) {
+# Fail if RSPM isn't the configured CRAN mirror
+if (!(startsWith(options()$repos["CRAN"], "https://packagemanager.posit.co"))) {
   quit("yes", 1)
 }