* Store the jobset's nixExprPath and nixExprInput fields in a build to

allow it to be cloned (re-executed with modified inputs) later and
  to provide some traceability.

doc/dev-notes.txt

@@ -100,6 +100,8 @@
   alter table ViewJobs drop column mayFail;
   alter table ViewJobs add column autorelease integer not null default 0;
 
+  alter table Builds add column nixExprInput text;
+  alter table Builds add column nixExprPath text;
 
   
 * Job selection:

src/lib/Hydra/Schema/Builds.pm

@@ -122,6 +122,20 @@ __PACKAGE__->add_columns(
   },
   "iscurrent",
   { data_type => "integer", default_value => 0, is_nullable => 1, size => undef },
+  "nixexprinput",
+  {
+    data_type => "text",
+    default_value => undef,
+    is_nullable => 1,
+    size => undef,
+  },
+  "nixexprpath",
+  {
+    data_type => "text",
+    default_value => undef,
+    is_nullable => 1,
+    size => undef,
+  },
 );
 __PACKAGE__->set_primary_key("id");
 __PACKAGE__->belongs_to("project", "Hydra::Schema::Projects", { name => "project" });
@@ -172,8 +186,8 @@ __PACKAGE__->has_many(
 );
 
 
-# Created by DBIx::Class::Schema::Loader v0.04999_09 @ 2009-10-23 16:56:03
-# DO NOT MODIFY THIS OR ANYTHING ABOVE! md5sum:L+BuQvxJL8gG7jib1AAIrw
+# Created by DBIx::Class::Schema::Loader v0.04999_09 @ 2009-10-26 14:22:27
+# DO NOT MODIFY THIS OR ANYTHING ABOVE! md5sum:qbNPA5NkENlZXILuE3OGkA
 
 use Hydra::Helper::Nix;
 

src/script/hydra_scheduler.pl

@@ -304,6 +304,8 @@ sub checkJob {
             , outpath => $outPath
             , system => $job->{system}
             , iscurrent => 1
+            , nixexprinput => $jobset->nixexprinput
+            , nixexprpath => $jobset->nixexprpath
             });
 
         print "added to queue as build ", $build->id, "\n";

src/sql/hydra.sql

@@ -135,6 +135,12 @@ create table Builds (
 
     isCurrent     integer default 0,
 
+    -- Copy of the nixExprInput/nixExprPath fields of the jobset that
+    -- instantiated this build.  Needed if we want to clone this
+    -- build.
+    nixExprInput  text,
+    nixExprPath   text,
+    
     foreign key   (project) references Projects(name) on update cascade,
     foreign key   (project, jobset) references Jobsets(project, name) on update cascade,
     foreign key   (project, jobset, job) references Jobs(project, jobset, name) on update cascade