lib: let getAttrs ignore nonexistent keys

lib/attrsets.nix

@@ -541,7 +541,8 @@ rec {
 
   /**
     Given a set of attribute names, return the set of the corresponding
-    attributes from the given set.
+    attributes from the given set. If the attributes does not exist,
+    they will be ignored.
 
 
     # Inputs
@@ -565,15 +566,15 @@ rec {
     ## `lib.attrsets.getAttrs` usage example
 
     ```nix
-    getAttrs [ "a" "b" ] { a = 1; b = 2; c = 3; }
+    getAttrs [ "a" "b" "d" ] { a = 1; b = 2; c = 3; }
     => { a = 1; b = 2; }
     ```
 
     :::
   */
   getAttrs =
     names:
-    attrs: genAttrs names (name: attrs.${name});
+    attrs: intersectAttrs (genAttrs names (_: null)) attrs;
 
   /**
     Collect each attribute named `attr` from a list of attribute

lib/tests/misc.nix

@@ -57,6 +57,7 @@ let
     functionArgs
     generators
     genList
+    getAttrs
     getExe
     getExe'
     getLicenseFromSpdxIdOr
@@ -2094,6 +2095,18 @@ runTests {
     };
   };
 
+  testGetAttrs = {
+    expr = getAttrs [ "a" "b" "nonexistent" ] {
+      a = 1;
+      b = true;
+      c = "hello";
+    };
+    expected = {
+      a = 1;
+      b = true;
+    };
+  };
+
   ## Levenshtein distance functions and co.
   testCommonPrefixLengthEmpty = {
     expr = strings.commonPrefixLength "" "hello";