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authorEelco Dolstra <e.dolstra@tudelft.nl>2012-01-03T14·01+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2012-01-03T14·01+0000
commit921111d1972388a0aa1841c545c753cb996c9257 (patch)
treeab965ec07c63db0649c8d9871f6c72813b2696a9 /corepkgs
parent6c31232e1494d1d68a31fb8433dbf593f831dff2 (diff)
* Move the implementation of the ‘derivation’ primop into a separate
  file.

Diffstat (limited to 'corepkgs')
-rw-r--r--corepkgs/Makefile.am2
-rw-r--r--corepkgs/derivation.nix31
2 files changed, 32 insertions, 1 deletions
diff --git a/corepkgs/Makefile.am b/corepkgs/Makefile.am
index 86d7027ed06e..a8de601657b1 100644
--- a/corepkgs/Makefile.am
+++ b/corepkgs/Makefile.am
@@ -1,6 +1,6 @@
 all-local: config.nix
 
-files = nar.nix buildenv.nix buildenv.pl unpack-channel.nix unpack-channel.sh
+files = nar.nix buildenv.nix buildenv.pl unpack-channel.nix unpack-channel.sh derivation.nix
 
 install-exec-local:
 	$(INSTALL) -d $(DESTDIR)$(datadir)/nix/corepkgs
diff --git a/corepkgs/derivation.nix b/corepkgs/derivation.nix
new file mode 100644
index 000000000000..0e16ad6fa300
--- /dev/null
+++ b/corepkgs/derivation.nix
@@ -0,0 +1,31 @@
+attrs:
+
+let
+
+  strict = derivationStrict attrs;
+  
+  attrValues = attrs:
+    map (name: builtins.getAttr name attrs) (builtins.attrNames attrs);
+    
+  outputToAttrListElement = output:
+    { name = output;
+      value = attrs // {
+        outPath = builtins.getAttr (output + "Path") strict;
+        drvPath = strict.drvPath;
+        type = "derivation";
+        currentOutput = output;
+      } // outputsAttrs // { all = allList; };
+    };
+    
+  outputsList =
+    if attrs ? outputs
+    then map outputToAttrListElement attrs.outputs
+    else [ (outputToAttrListElement "out") ];
+    
+  outputsAttrs = builtins.listToAttrs outputsList;
+  
+  allList = attrValues outputsAttrs;
+  
+  head = if attrs ? outputs then builtins.head attrs.outputs else "out";
+  
+in builtins.getAttr head outputsAttrs