Hold an archive, a process's unit and a user found on an adopted node for an untaken module (hq ADR 0103)

internal/apply/process.go

@@ -32,8 +32,9 @@ import (
 // owners end up disagreeing about one path.
 const daemonRoot = "/var/lib/mesh/daemons"
 
-// unitDir is where the mesh writes the units it owns.
-const unitDir = "/etc/systemd/system"
+// unitDir is where the mesh writes the units it owns. A variable only so a test can point it at a
+// directory of its own.
+var unitDir = "/etc/systemd/system"
 
 func applyProcess(ctx context.Context, r *declaration.Process, run Runner,
 	changed map[string]bool, previous store.Applied) (Outcome, error) {