1 files changed, 48 insertions, 0 deletions
diff --git a/nix/getBins/default.nix b/nix/getBins/default.nix
new file mode 100644
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+++ b/nix/getBins/default.nix
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+{ lib, pkgs, depot, ... }:
+
+# Takes a derivation and a list of binary names
+# and returns an attribute set of `name -> path`.
+# The list can also contain renames in the form of
+# `{ use, as }`, which goes `as -> usePath`.
+#
+# It is usually used to construct an attrset `bins`
+# containing all the binaries required in a file,
+# similar to a simple import system.
+#
+# Example:
+#
+#   bins = getBins pkgs.hello [ "hello" ]
+#       // getBins pkgs.coreutils [ "printf" "ln" "echo" ]
+#       // getBins pkgs.execline
+#            [ { use = "if"; as = "execlineIf" } ]
+#       // getBins pkgs.s6-portable-utils
+#            [ { use = "s6-test"; as = "test" }
+#              { use = "s6-cat"; as = "cat" }
+#            ];
+#
+#   provides
+#     bins.{hello,printf,ln,echo,execlineIf,test,cat}
+#
+
+let
+  getBins = drv: xs:
+    let f = x:
+      # TODO(Profpatsch): typecheck
+      let x' = if builtins.isString x then { use = x; as = x; } else x;
+      in {
+        name = x'.as;
+        value = "${lib.getBin drv}/bin/${x'.use}";
+      };
+    in builtins.listToAttrs (builtins.map f xs);
+
+
+  tests = import ./tests.nix {
+    inherit getBins;
+    inherit (depot.nix) writeScriptBin;
+    inherit (depot.nix.runTestsuite) assertEq it runTestsuite;
+  };
+
+in {
+  __functor = _: getBins;
+  inherit tests;
+}