refactor(readTree): Move 'drvTargets' into readTree

This function is also generally useful for readTree consumers that
have the concept of subtargets.

Change-Id: Ic7fc03380dec6953fb288763a28e50ab3624d233

fun/idual/default.nix

@@ -14,7 +14,7 @@ let
   };
   package = python3Packages.buildPythonPackage opts;
   script  = python3Packages.buildPythonApplication opts;
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   inherit script;
   python  = python3.withPackages (_: [ package ]);
   setAlarm = pkgs.writeShellScriptBin "set-alarm" ''

nix/readTree/default.nix

@@ -157,6 +157,10 @@ let
            })
            (node.meta.targets or []))
     else [];
+
+  # Determine whether a given value is a derivation.
+  # Copied from nixpkgs/lib for cases where lib is not available yet.
+  isDerivation = x: isAttrs x && x ? type && x.type == "derivation";
 in {
   inherit gather;
 
@@ -210,4 +214,17 @@ in {
   #
   # It is often required to create the args attribute set.
   fix = f: let x = f x; in x;
+
+  # Takes an attribute set and adds a meta.targets attribute to it
+  # which contains all direct children of the attribute set which are
+  # derivations.
+  #
+  # Type: attrs -> attrs
+  drvTargets = attrs: attrs // {
+    meta = {
+      targets = builtins.filter
+      (x: isDerivation attrs."${x}")
+      (builtins.attrNames attrs);
+    } // (attrs.meta or {});
+  };
 }

nix/utils/default.nix

@@ -1,22 +1,6 @@
 { depot, lib, ... }:
 
 let
-
-  /* Takes an attribute set and adds a meta.targets
-     attribute to it which contains all direct children
-     of the attribute set which are derivations.
-
-     Type: attrs -> attrs
-  */
-  drvTargets = attrs:
-    attrs // {
-      meta = {
-        targets = builtins.filter
-          (x: lib.isDerivation attrs."${x}")
-          (builtins.attrNames attrs);
-      } // (attrs.meta or {});
-    };
-
   /* Get the basename of a store path without
      the leading hash.
 
@@ -186,7 +170,6 @@ let
 
 in {
   inherit
-    drvTargets
     storePathName
     pathType
     isDirectory

nix/writers/tests/rust.nix

@@ -60,7 +60,7 @@ let
   '');
 
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   inherit
     rustTransitiveLib
     rustWithLib

ops/dns/default.nix

@@ -2,15 +2,11 @@
 { depot, pkgs, ... }:
 
 let
-  inherit (depot.nix.utils)
-    drvTargets
-    ;
-
   checkZone = zone: file: pkgs.runCommandNoCC "${zone}-check" {} ''
     ${pkgs.bind}/bin/named-checkzone -i local ${zone} ${file} | tee $out
   '';
 
-in drvTargets {
+in depot.nix.readTree.drvTargets {
   nixery-dev = checkZone "nixery.dev" ./nixery.dev.zone;
   tvl-fyi = checkZone "tvl.fyi" ./tvl.fyi.zone;
   tvl-su = checkZone "tvl.su" ./tvl.su.zone;

third_party/gerrit_plugins/default.nix

@@ -2,7 +2,7 @@
 
 let
   inherit (import ./builder.nix args) buildGerritBazelPlugin;
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   # https://gerrit.googlesource.com/plugins/owners
   owners = buildGerritBazelPlugin rec {
     name = "owners";

third_party/nixery/default.nix

@@ -3,7 +3,7 @@
 { depot, pkgs, ... }:
 
 let
-  inherit (depot.nix.utils) drvTargets;
+  inherit (depot.nix.readTree) drvTargets;
 
   commit = "6c4a69fa4280f0154ce257a1dfd23fb463c1ec5b";
   src = pkgs.fetchFromGitHub {

tools/rust-crates-advisory/default.nix

@@ -77,7 +77,7 @@ let
     bins.s6-touch "$out"
   ];
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
 
   check-all-our-crates =
     depot.nix.drvSeqL

users/Profpatsch/arglib/netencode.nix

@@ -37,4 +37,4 @@ let
     '';
   };
 
-in depot.nix.utils.drvTargets netencode
+in depot.nix.readTree.drvTargets netencode

users/Profpatsch/blog/default.nix

@@ -358,7 +358,7 @@ let
     bins.cdbget "$2"
   ];
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
    inherit
     router
     depotCgitLink

users/Profpatsch/execline/default.nix

@@ -5,7 +5,7 @@ let
     name = "exec-helpers";
   } (builtins.readFile ./exec_helpers.rs);
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   inherit
     exec-helpers
     ;

users/Profpatsch/netencode/default.nix

@@ -135,7 +135,7 @@ let
     }
   '';
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   inherit
     netencode-rs
     pretty-rs

users/Profpatsch/netstring/default.nix

@@ -55,7 +55,7 @@ let
     }
   '';
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   inherit
     python-netstring
     rust-netstring

users/Profpatsch/netstring/tests/default.nix

@@ -53,7 +53,7 @@ let
     }
   '';
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   inherit
     python-netstring-test
     rust-netstring-test

users/Profpatsch/nixpkgs-rewriter/default.nix

@@ -101,7 +101,7 @@ let
     "nix-instantiate" "$1" "-A" "{}"
   ];
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   inherit
    instantiate-nixpkgs-randomly
   # requires hnix, which we don’t want in tvl for now

users/Profpatsch/tree-sitter.nix

@@ -169,7 +169,7 @@ let
         '';
       };
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   inherit
     print-ast
     tree-sitter-nix

users/Profpatsch/writers/tests/default.nix

@@ -41,7 +41,7 @@ let
     assert(test_lib.test() == "test 1 2 3")
   '');
 
-in depot.nix.utils.drvTargets {
+in depot.nix.readTree.drvTargets {
   inherit
     pythonWithLib
     ;

users/tazjin/dns/default.nix

@@ -2,13 +2,11 @@
 { depot, pkgs, ... }:
 
 let
-  inherit (depot.nix.utils) drvTargets;
-
   checkZone = zone: file: pkgs.runCommandNoCC "${zone}-check" {} ''
     ${pkgs.bind}/bin/named-checkzone -i local ${zone} ${file} | tee $out
   '';
 
-in drvTargets {
+in depot.nix.readTree.drvTargets {
   kontemplate-works = checkZone "kontemplate.works"./kontemplate.works.zone;
   tazj-in = checkZone "tazj.in" ./tazj.in.zone;
 }

web/tvl/logo/default.nix

@@ -67,7 +67,7 @@ let
     </svg>
   '';
 
-in depot.nix.utils.drvTargets(lib.fix (self: {
+in depot.nix.readTree.drvTargets(lib.fix (self: {
   # Expose the logo construction functions.
   inherit palette darkCss lightCss animatedCss staticCss;