2 files changed, 16 insertions, 1 deletions
diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index 222a1ff95cc2..af40e0b9286a 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -63,6 +63,15 @@ void addTempRoot(const Path & path)
 }
 
 
+void removeTempRoots()
+{
+    if (fdTempRoots != -1) {
+        fdTempRoots.close();
+        unlink(fnTempRoots.c_str());
+    }
+}
+
+
 typedef shared_ptr<AutoCloseFD> FDPtr;
 typedef list<FDPtr> FDs;
 
@@ -94,7 +103,8 @@ static void readTempRoots(PathSet & tempRoots, FDs & fds)
         if (lockFile(*fd, ltWrite, false)) {
             printMsg(lvlError, format("removing stale temporary roots file `%1%'")
                 % path);
-            /* !!! write token, unlink */
+            unlink(path.c_str());
+            writeFull(*fd, (const unsigned char *) "d", 1);
             continue;
         }
 
diff --git a/src/libstore/gc.hh b/src/libstore/gc.hh
index c8f908b152aa..91c5be91406b 100644
--- a/src/libstore/gc.hh
+++ b/src/libstore/gc.hh
@@ -21,5 +21,10 @@ void collectGarbage(const PathSet & roots, GCAction action,
    deadlock. */
 void addTempRoot(const Path & path);
 
+/* Remove the temporary roots file for this process.  Any temporary
+   root becomes garbage after this point unless it has been registered
+   as a (permanent) root. */
+void removeTempRoots();
+
 
 #endif /* !__GC_H */