1 files changed, 90 insertions, 0 deletions
diff --git a/nixpkgs/lib/meta.nix b/nixpkgs/lib/meta.nix
new file mode 100644
index 00000000000..2e83c4247dd
--- /dev/null
+++ b/nixpkgs/lib/meta.nix
@@ -0,0 +1,90 @@
+/* Some functions for manipulating meta attributes, as well as the
+   name attribute. */
+
+{ lib }:
+
+rec {
+
+
+  /* Add to or override the meta attributes of the given
+     derivation.
+
+     Example:
+       addMetaAttrs {description = "Bla blah";} somePkg
+  */
+  addMetaAttrs = newAttrs: drv:
+    drv // { meta = (drv.meta or {}) // newAttrs; };
+
+
+  /* Disable Hydra builds of given derivation.
+  */
+  dontDistribute = drv: addMetaAttrs { hydraPlatforms = []; } drv;
+
+
+  /* Change the symbolic name of a package for presentation purposes
+     (i.e., so that nix-env users can tell them apart).
+  */
+  setName = name: drv: drv // {inherit name;};
+
+
+  /* Like `setName', but takes the previous name as an argument.
+
+     Example:
+       updateName (oldName: oldName + "-experimental") somePkg
+  */
+  updateName = updater: drv: drv // {name = updater (drv.name);};
+
+
+  /* Append a suffix to the name of a package (before the version
+     part). */
+  appendToName = suffix: updateName (name:
+    let x = builtins.parseDrvName name; in "${x.name}-${suffix}-${x.version}");
+
+
+  /* Apply a function to each derivation and only to derivations in an attrset.
+  */
+  mapDerivationAttrset = f: set: lib.mapAttrs (name: pkg: if lib.isDerivation pkg then (f pkg) else pkg) set;
+
+  /* Set the nix-env priority of the package.
+  */
+  setPrio = priority: addMetaAttrs { inherit priority; };
+
+  /* Decrease the nix-env priority of the package, i.e., other
+     versions/variants of the package will be preferred.
+  */
+  lowPrio = setPrio 10;
+
+  /* Apply lowPrio to an attrset with derivations
+  */
+  lowPrioSet = set: mapDerivationAttrset lowPrio set;
+
+
+  /* Increase the nix-env priority of the package, i.e., this
+     version/variant of the package will be preferred.
+  */
+  hiPrio = setPrio (-10);
+
+  /* Apply hiPrio to an attrset with derivations
+  */
+  hiPrioSet = set: mapDerivationAttrset hiPrio set;
+
+
+  /* Check to see if a platform is matched by the given `meta.platforms`
+     element.
+
+     A `meta.platform` pattern is either
+
+       1. (legacy) a system string.
+
+       2. (modern) a pattern for the platform `parsed` field.
+
+     We can inject these into a patten for the whole of a structured platform,
+     and then match that.
+  */
+  platformMatch = platform: elem: let
+      pattern =
+        if builtins.isString elem
+        then { system = elem; }
+        else { parsed = elem; };
+    in lib.matchAttrs pattern platform;
+}