Remove mentions of MRAN

Author: yuvipanda

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
-`Posit Package Manager <https://mran.microsoft.com/documents/rro/reproducibility>`_.
+`Posit Package Manager <https://packagemanager.posit.co/>`_.
 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>`_.
 

repo2docker/buildpacks/r.py

@@ -22,8 +22,7 @@ class RBuildPack(PythonBuildPack):
 
        Where 'year', 'month' and 'date' refer to a specific
        date whose CRAN snapshot we will use to fetch packages.
-       Uses https://packagemanager.posit.co, or MRAN if no snapshot
-       is found on packagemanager.posit.co
+       Uses https://packagemanager.posit.co.
 
     2. A `DESCRIPTION` file signaling an R package
 

tests/r/README.md

@@ -24,18 +24,6 @@
   `runtime.txt` is omitted and a recent enough snapshot date is assumed a RSPM
   snapshot of CRAN to be used.
 
-### r3.6-mran
-
-- Test setup of a R 3.6 environment by specifying `r-3.6-...` in `runtime.txt`,
-  where the date provided in `runtime.txt` is old enough for a MRAN snapshot of
-  CRAN to be used.
-
-### r4.0-mran
-
-- Test setup of a R 4.0 environment by specifying `r-4.0-...` in `runtime.txt`,
-  where the date provided in `runtime.txt` is old enough for a MRAN snapshot of
-  CRAN to be used.
-
 ### r4.0-rspm
 
 - Test setup of a R 4.0 environment by specifying `r-4.0-...` in `runtime.txt`,