Merge pull request #150132 from wamserma/remove-python2Writer

writers.writePython2: remove / writers.writePyPy{2,3}: init

nixos/doc/manual/from_md/release-notes/rl-2205.section.xml

···
           release based on GTK+3 and Python 3.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          The <literal>writers.writePython2</literal> and corresponding
+          <literal>writers.writePython2Bin</literal> convenience
+          functions to create executable Python 2 scripts in the store
+          were removed in preparation of removal of the Python 2
+          interpreter. Scripts have to be converted to Python 3 for use
+          with <literal>writers.writePython3</literal> or
+          <literal>writers.writePyPy2</literal> needs to be used.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
   <section xml:id="sec-release-22.05-notable-changes">
     <title>Other Notable Changes</title>
-    <itemizedlist spacing="compact">
+    <itemizedlist>
       <listitem>
         <para>
           The option
···
           are only accessible by default to the members of the Unix
           group <literal>redis-${serverName}</literal> through the Unix
           socket <literal>/run/redis-${serverName}/redis.sock</literal>.
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          The
+          <literal>writers.writePyPy2</literal>/<literal>writers.writePyPy3</literal>
+          and corresponding
+          <literal>writers.writePyPy2Bin</literal>/<literal>writers.writePyPy3Bin</literal>
+          convenience functions to create executable Python 2/3 scripts
+          using the PyPy interpreter were added.
         </para>
       </listitem>
     </itemizedlist>

nixos/doc/manual/release-notes/rl-2205.section.md

···
 - `pkgs.claws-mail-gtk2`, representing Claws Mail's older release version three, was removed in order to get rid of Python 2.
   Please switch to `claws-mail`, which is Claws Mail's latest release based on GTK+3 and Python 3.
 
+- The `writers.writePython2` and corresponding `writers.writePython2Bin` convenience functions to create executable Python 2 scripts in the store were removed in preparation of removal of the Python 2 interpreter.
+  Scripts have to be converted to Python 3 for use with `writers.writePython3` or `writers.writePyPy2` needs to be used.
+
 ## Other Notable Changes {#sec-release-22.05-notable-changes}
 
 - The option [services.redis.servers](#opt-services.redis.servers) was added
···
   are only accessible by default
   to the members of the Unix group `redis-${serverName}`
   through the Unix socket `/run/redis-${serverName}/redis.sock`.
+
+- The `writers.writePyPy2`/`writers.writePyPy3` and corresponding `writers.writePyPy2Bin`/`writers.writePyPy3Bin` convenience functions to create executable Python 2/3 scripts using the PyPy interpreter were added.

pkgs/build-support/writers/aliases.nix

···
+lib: prev:
+
+let
+  # Removing recurseForDerivation prevents derivations of aliased attribute
+  # set to appear while listing all the packages available.
+  removeRecurseForDerivations = alias: with lib;
+    if alias.recurseForDerivations or false then
+      removeAttrs alias ["recurseForDerivations"]
+    else alias;
+
+  # Disabling distribution prevents top-level aliases for non-recursed package
+  # sets from building on Hydra.
+  removeDistribute = alias: with lib;
+    if isDerivation alias then
+      dontDistribute alias
+    else alias;
+
+  # Make sure that we are not shadowing something from
+  # writers.
+  checkInPkgs = n: alias: if builtins.hasAttr n prev
+                          then throw "Alias ${n} is still in writers"
+                          else alias;
+
+  mapAliases = aliases:
+    lib.mapAttrs (n: alias: removeDistribute
+                             (removeRecurseForDerivations
+                              (checkInPkgs n alias)))
+                     aliases;
+
+in
+mapAliases ({
+  /* Cleanup before 22.05, Added 2021-12-11 */
+  writePython2 = "Python 2 is EOL and the use of writers.writePython2 is deprecated.";
+  writePython2Bin = "Python 2 is EOL and the use of writers.writePython2Bin is deprecated.";
+})

pkgs/build-support/writers/default.nix

···
-{ pkgs, buildPackages, lib, stdenv, libiconv, gawk, gnused, gixy }:
+{ pkgs, config, buildPackages, lib, stdenv, libiconv, gawk, gnused, gixy }:
 
-with lib;
-rec {
+let
+  aliases = if (config.allowAliases or true) then (import ./aliases.nix lib) else prev: {};
+
+  writers = with lib; rec {
   # Base implementation for non-compiled executables.
   # Takes an interpreter, for example `${pkgs.bash}/bin/bash`
   #
···
     '');
   } name;
 
-  # writePython2 takes a name an attributeset with libraries and some python2 sourcecode and
+  # writePyPy2 takes a name an attributeset with libraries and some pypy2 sourcecode and
   # returns an executable
   #
   # Example:
-  # writePython2 "test_python2" { libraries = [ pkgs.python2Packages.enum ]; } ''
+  # writePyPy2 "test_pypy2" { libraries = [ pkgs.pypy2Packages.enum ]; } ''
   #   from enum import Enum
   #
   #   class Test(Enum):
···
   #
   #   print Test.a
   # ''
-  writePython2 = makePythonWriter pkgs.python2 pkgs.python2Packages;
+  writePyPy2 = makePythonWriter pkgs.pypy2 pkgs.pypy2Packages;
 
-  # writePython2Bin takes the same arguments as writePython2 but outputs a directory (like writeScriptBin)
-  writePython2Bin = name:
-    writePython2 "/bin/${name}";
+  # writePyPy2Bin takes the same arguments as writePyPy2 but outputs a directory (like writeScriptBin)
+  writePyPy2Bin = name:
+    writePyPy2 "/bin/${name}";
 
   # writePython3 takes a name an attributeset with libraries and some python3 sourcecode and
   # returns an executable
···
   # writePython3Bin takes the same arguments as writePython3 but outputs a directory (like writeScriptBin)
   writePython3Bin = name:
     writePython3 "/bin/${name}";
-}
+
+  # writePyPy3 takes a name an attributeset with libraries and some pypy3 sourcecode and
+  # returns an executable
+  #
+  # Example:
+  # writePyPy3 "test_pypy3" { libraries = [ pkgs.pypy3Packages.pyyaml ]; } ''
+  #   import yaml
+  #
+  #   y = yaml.load("""
+  #     - test: success
+  #   """)
+  #   print(y[0]['test'])
+  # ''
+  writePyPy3 = makePythonWriter pkgs.pypy3 pkgs.pypy3Packages;
+
+  # writePyPy3Bin takes the same arguments as writePyPy3 but outputs a directory (like writeScriptBin)
+  writePyPy3Bin = name:
+    writePyPy3 "/bin/${name}";
+
+};
+in
+writers // (aliases writers)

pkgs/build-support/writers/test.nix

···
 , lib
 , nodePackages
 , perlPackages
-, python2Packages
+, pypy2Packages
 , python3Packages
+, pypy3Packages
 , runCommand
 , writers
 , writeText
···
       print "success\n" if true;
     '';
 
-    python2 = writePython2Bin "test-writers-python2-bin" { libraries = [ python2Packages.enum ]; } ''
+    pypy2 = writePyPy2Bin "test-writers-pypy2-bin" { libraries = [ pypy2Packages.enum ]; } ''
       from enum import Enum
 
 
···
       """)
       print(y[0]['test'])
     '';
+
+    pypy3 = writePyPy3Bin "test-writers-pypy3-bin" { libraries = [ pypy3Packages.pyyaml ]; } ''
+      import yaml
+
+      y = yaml.load("""
+        - test: success
+      """)
+      print(y[0]['test'])
+    '';
   };
 
   simple = {
···
       print "success\n" if true;
     '';
 
-    python2 = writePython2 "test-writers-python2" { libraries = [ python2Packages.enum ]; } ''
+    pypy2 = writePyPy2 "test-writers-pypy2" { libraries = [ pypy2Packages.enum ]; } ''
       from enum import Enum
 
 
···
       print(y[0]['test'])
     '';
 
-    python2NoLibs = writePython2 "test-writers-python2-no-libs" {} ''
+    pypy3 = writePyPy3 "test-writers-pypy3" { libraries = [ pypy3Packages.pyyaml ]; } ''
+      import yaml
+
+      y = yaml.load("""
+        - test: success
+      """)
+      print(y[0]['test'])
+    '';
+
+    pypy2NoLibs = writePyPy2 "test-writers-pypy2-no-libs" {} ''
       print("success")
     '';
 
     python3NoLibs = writePython3 "test-writers-python3-no-libs" {} ''
+      print("success")
+    '';
+
+    pypy3NoLibs = writePyPy3 "test-writers-pypy3-no-libs" {} ''
       print("success")
     '';
   };