populate: draw inputs from sources that aren't flakes

Generated flakes declared every source they draw inputs from as a flake,
so drawing an input declared with flake = false from a source without
flake.nix failed, although the README says it works.  Such sources get
declared with flake = false now.

An edge case draws a non-flake input from a source without flake.nix.

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/fixtures.sh b/tests/fixtures.sh
index 8222b13..1f6c478 100755
--- a/tests/fixtures.sh
+++ b/tests/fixtures.sh
@@ -233,6 +233,17 @@ cat > /fixtures/c2/flake.nix <<'NIX'
 { outputs = _: { who = "c2"; }; }
 NIX
 
+# usedata, data: a flake with an input that isn't a flake, and a directory
+# to draw it from.
+mkdir /fixtures/usedata /fixtures/data
+cat > /fixtures/usedata/flake.nix <<'NIX'
+{
+  inputs.data = { url = "path:/nonexistent"; flake = false; };
+  outputs = { data, ... }: { msg = "data:${builtins.readFile (data + "/value")}"; };
+}
+NIX
+printf hello > /fixtures/data/value
+
 # noflake: a directory without flake.nix.
 mkdir /fixtures/noflake
 echo noflake > /fixtures/noflake/README