journal: report parsing errors on recover/rollback (issue4172)

mercurial/transaction.py

@@ -174,7 +174,10 b' def rollback(opener, file, report):'
     lines = fp.readlines()
     fp.close()
     for l in lines:
+        try:
         f, o = l.split('\0')
         entries.append((f, int(o), None))
+        except ValueError:
+            report(_("couldn't read journal entry %r!\n") % l)
 
     _playback(file, report, opener, entries)

tests/test-rollback.t

@@ -184,4 +184,14 b' same again, but emulate an old client th'
   $ cat a
   a
 
-  $ cd ..
+corrupt journal test
+  $ echo "foo" > .hg/store/journal
+  $ hg recover
+  rolling back interrupted transaction
+  couldn't read journal entry 'foo\n'!
+  checking changesets
+  checking manifests
+  crosschecking files in changesets and manifests
+  checking files
+  1 files, 2 changesets, 2 total revisions
+