diff hgext/convert/monotone.py @ 22296:650b5b6e75ed

convert: use None value for missing files instead of overloading IOError

The internal API used IOError to indicate that a file should be marked as
removed.

There is some correlation between IOError (especially with ENOENT) and files
that should be removed, but using IOErrors to represent file removal internally
required some hacks.

Instead, use the value None to indicate that the file not is present.

Before, spurious IO errors could cause commits that silently removed files.
They will now be reported like all other IO errors so the root cause can be
fixed.

--- a/hgext/convert/monotone.py	Wed Aug 27 12:30:28 2014 +0200
+++ b/hgext/convert/monotone.py	Tue Aug 26 22:03:32 2014 +0200
@@ -282,11 +282,11 @@
 
     def getfile(self, name, rev):
         if not self.mtnisfile(name, rev):
-            raise IOError # file was deleted or renamed
+            return None, None
         try:
             data = self.mtnrun("get_file_of", name, r=rev)
         except Exception:
-            raise IOError # file was deleted or renamed
+            return None, None
         self.mtnloadmanifest(rev)
         node, attr = self.files.get(name, (None, ""))
         return data, attr