Add flake configuration to the web interface

src/sql/hydra.sql

@@ -54,8 +54,8 @@ create table Jobsets (
     name          text not null,
     project       text not null,
     description   text,
-    nixExprInput  text not null, -- name of the jobsetInput containing the Nix or Guix expression
-    nixExprPath   text not null, -- relative path of the Nix or Guix expression
+    nixExprInput  text, -- name of the jobsetInput containing the Nix or Guix expression
+    nixExprPath   text, -- relative path of the Nix or Guix expression
     errorMsg      text, -- used to signal the last evaluation error etc. for this jobset
     errorTime     integer, -- timestamp associated with errorMsg
     lastCheckedTime integer, -- last time the evaluator looked at this jobset
@@ -70,7 +70,11 @@ create table Jobsets (
     fetchErrorMsg text,
     forceEval     boolean,
     startTime     integer, -- if jobset is currently running
+    type          integer not null default 0, -- 0 == legacy, 1 == flake
+    flake         text,
     check (schedulingShares > 0),
+    check ((type = 0) = (nixExprInput is not null and nixExprPath is not null)),
+    check ((type = 1) = (flake is not null)),
     primary key   (project, name),
     foreign key   (project) references Projects(name) on delete cascade on update cascade
 #ifdef SQLITE

src/sql/upgrade-57.sql

@@ -0,0 +1,6 @@
+alter table Jobsets alter column nixExprInput drop not null;
+alter table Jobsets alter column nixExprPath drop not null;
+alter table Jobsets add column type integer default 0;
+alter table Jobsets add column flake text;
+alter table Jobsets add check ((type = 0) = (nixExprInput is not null and nixExprPath is not null));
+alter table Jobsets add check ((type = 1) = (flake is not null));