perlPackages.Appcpanminus: shorten shebangs (#433515)

pkgs/by-name/la/lanraragi/package.nix

@@ -30,6 +30,7 @@ buildNpmPackage rec {
 
   nativeBuildInputs = [
     perl
+    perl.pkgs.Appcpanminus
     makeBinaryWrapper
   ];
 
@@ -77,8 +78,7 @@ buildNpmPackage rec {
     runHook preBuild
 
     # Check if every perl dependency was installed
-    # explicitly call cpanm with perl because the shebang is broken on darwin
-    perl ${perl.pkgs.Appcpanminus}/bin/cpanm --installdeps ./tools --notest
+    cpanm --installdeps ./tools --notest
 
     perl ./tools/install.pl install-full
     rm -r node_modules public/js/vendor/*.map public/css/vendor/*.map

pkgs/top-level/perl-packages.nix

@@ -1188,6 +1188,10 @@ with self;
         --replace-fail http://cpanmetadb.plackperl.org https://cpanmetadb.plackperl.org
     '';
     propagatedBuildInputs = [ IOSocketSSL ];
+    nativeBuildInputs = lib.optional stdenv.hostPlatform.isDarwin shortenPerlShebang;
+    postInstall = lib.optionalString stdenv.hostPlatform.isDarwin ''
+      shortenPerlShebang $out/bin/cpanm
+    '';
     meta = {
       description = "Get, unpack, build and install modules from CPAN";
       homepage = "https://github.com/miyagawa/cpanminus";