lib.sources.pathType and co.: Move to lib.filesystem

These functions only work with the filesystem, they don't import
anything as sources

lib/default.nix

@@ -117,10 +117,11 @@ let
     inherit (self.meta) addMetaAttrs dontDistribute setName updateName
       appendToName mapDerivationAttrset setPrio lowPrio lowPrioSet hiPrio
       hiPrioSet getLicenseFromSpdxId getExe;
-    inherit (self.sources) pathType pathIsDirectory cleanSourceFilter
+    inherit (self.filesystem) pathType pathIsDirectory pathIsRegularFile;
+    inherit (self.sources) cleanSourceFilter
       cleanSource sourceByRegex sourceFilesBySuffices
       commitIdFromGitRepo cleanSourceWith pathHasContext
-      canCleanSource pathIsRegularFile pathIsGitRepo;
+      canCleanSource pathIsGitRepo;
     inherit (self.modules) evalModules setDefaultModuleLocation
       unifyModuleSyntax applyModuleArgsIfFunction mergeModules
       mergeModules' mergeOptionDecls evalOptionValue mergeDefinitions

lib/filesystem.nix

@@ -2,12 +2,38 @@
 { lib }:
 
 let
+  inherit (builtins)
+    getAttr
+    readDir
+    pathExists
+    ;
+
   inherit (lib.strings)
     hasPrefix
     ;
+
+  inherit (lib.filesystem)
+    pathType
+    ;
 in
 
 {
+
+  /*
+    Returns the type of a path: regular (for file), symlink, or directory.
+  */
+  pathType = path: getAttr (baseNameOf path) (readDir (dirOf path));
+
+  /*
+    Returns true if the path exists and is a directory, false otherwise.
+  */
+  pathIsDirectory = path: if pathExists path then (pathType path) == "directory" else false;
+
+  /*
+    Returns true if the path exists and is a regular file, false otherwise.
+  */
+  pathIsRegularFile = path: if pathExists path then (pathType path) == "regular" else false;
+
   /*
     A map of all haskell packages defined in the given path,
     identified by having a cabal file with the same name as the

lib/sources.nix

@@ -18,21 +18,11 @@ let
     pathExists
     readFile
     ;
-
+  inherit (lib.filesystem)
-  /*
+    pathType
-    Returns the type of a path: regular (for file), symlink, or directory.
+    pathIsDirectory
-  */
+    pathIsRegularFile
-  pathType = path: getAttr (baseNameOf path) (readDir (dirOf path));
+    ;
-
-  /*
-    Returns true if the path exists and is a directory, false otherwise.
-  */
-  pathIsDirectory = path: if pathExists path then (pathType path) == "directory" else false;
-
-  /*
-    Returns true if the path exists and is a regular file, false otherwise.
-  */
-  pathIsRegularFile = path: if pathExists path then (pathType path) == "regular" else false;
 
   /*
     A basic filter for `cleanSourceWith` that removes
@@ -271,11 +261,20 @@ let
     };
 
 in {
-  inherit
-    pathType
-    pathIsDirectory
-    pathIsRegularFile
 
+  pathType = lib.warnIf (lib.isInOldestRelease 2305)
+    "lib.sources.pathType has been moved to lib.filesystem.pathType."
+    lib.filesystem.pathType;
+
+  pathIsDirectory = lib.warnIf (lib.isInOldestRelease 2305)
+    "lib.sources.pathIsDirectory has been moved to lib.filesystem.pathIsDirectory."
+    lib.filesystem.pathIsDirectory;
+
+  pathIsRegularFile = lib.warnIf (lib.isInOldestRelease 2305)
+    "lib.sources.pathIsRegularFile has been moved to lib.filesystem.pathIsRegularFile."
+    lib.filesystem.pathIsRegularFile;
+
+  inherit
     pathIsGitRepo
     commitIdFromGitRepo