unschroot: tweak --info output

 * Tag sessions as "Session Purged". This causes sbuild to skip
   uninstalling build-depends and other cleanup.
 * Always emit "Aliases" even when empty as we get a warning from sbuild
   otherwise.

1 files changed, 2 insertions, 3 deletions

diff --git a/examples/unschroot.py b/examples/unschroot.py
index fe37b9d..01029f7 100755
--- a/examples/unschroot.py
+++ b/examples/unschroot.py
@@ -71,9 +71,8 @@ class Chroot:
         if self.namespace == "Chroot":
             lines.extend(["Type file", f"File {self.path}"])
         if self.namespace == "Session":
-            lines.append(f"Location {self.path}")
-        if self.aliases:
-            lines.append("Aliases " + " ".join(sorted(self.aliases)))
+            lines.extend([f"Location {self.path}", "Session Purged true"])
+        lines.append("Aliases " + " ".join(sorted(self.aliases)))
         return "".join(map("%s\n".__mod__, lines))
 
     @classmethod