In case previous notmuch compact has been interrupted there is old
work-in-progress database compact directory partially filled. Remove
it just before starting to fill the directory with new files.
---
 lib/database.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/database.cc b/lib/database.cc
index ee09c5e..4b5ac64 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -920,6 +920,11 @@ notmuch_database_compact (const char *path,
 	goto DONE;
     }
 
+    // Unconditionally attempt to remove old work-in-progress database (if any).
+    // This is "protected" by database lock. If this fails due to write errors
+    // (etc), the following code will fail and provide error message.
+    (void) rmtree (compact_xapian_path);
+
     try {
 	NotmuchCompactor compactor (status_cb, closure);
 
-- 
1.8.3.1