Be better at removing dead links

projects/cram/src/python/cram/__main__.py

@@ -110,7 +110,7 @@ def build_fs(root: Path, dest: Path, prelude: List[str]) -> Vfs:
 def load_state(statefile: Path) -> Vfs:
     """Load a persisted VFS state from disk. Sort of."""
 
-    oldfs = Vfs()
+    oldfs = Vfs([])
 
     if statefile.exists():
         log.debug("Loading statefile %s", statefile)
@@ -207,6 +207,8 @@ def do_apply(confdir, destdir, state_file, execute, optimize, require, exec_idem
     root = confdir.resolve()
     dest = destdir.resolve()
 
+    log.info(f"Installing requirements {require}")
+
     if not root.is_dir():
         log.fatal(f"{confdir} does not exist!")
         _exit(1)

projects/vfs/src/python/vfs/impl.py

@@ -51,10 +51,14 @@ class Vfs(object):
 
             elif e[0] == "unlink":
                 _, dest = e
-                if dest.is_dir():
+                if dest.is_symlink():
+                    dest.unlink()
+                elif dest.is_dir():
                     rmtree(dest)
                 elif dest.is_file():
                     dest.unlink()
+                else:
+                    raise Exception(f"Couldn't unlink {dest}")
 
     def _append(self, msg):
         self._log.append(msg)