verify: fix "missing revlog!" errors for revlog format v0 and add test

With revlog format v0 the .d files are empty if the only revision stored is an
empty file. Since Mercurial can no longer create format v0 repositories, but
still use it, add a script which creates a repository with a single empty file.
This can be used in other tests if wanted.

mercurial/verify.py

@@ -199,7 +199,7 @@ def _verify(repo):
     for f, f2, size in repo.store.datafiles():
         if not f:
             err(None, _("cannot decode filename '%s'") % f2)
-        elif size > 0:
+        elif size > 0 or not revlogv1:
             storefiles.add(f)
 
     files = sorted(set(filenodes) | set(filelinkrevs))

tests/revlog-formatv0.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python
+# Copyright 2010 Intevation GmbH
+# Author(s):
+# Thomas Arendsen Hein <thomas@intevation.de>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+"""Create a Mercurial repository in revlog format 0
+
+changeset:   0:a1ef0b125355
+tag:         tip
+user:        user
+date:        Thu Jan 01 00:00:00 1970 +0000
+files:       empty
+description:
+empty file
+"""
+
+import os, sys
+
+files = [
+    ('formatv0/.hg/00changelog.i',
+     '000000000000004400000000000000000000000000000000000000'
+     '000000000000000000000000000000000000000000000000000000'
+     '0000a1ef0b125355d27765928be600cfe85784284ab3'),
+    ('formatv0/.hg/00changelog.d',
+     '756163613935613961356635353036303562366138343738336237'
+     '61623536363738616436356635380a757365720a3020300a656d70'
+     '74790a0a656d7074792066696c65'),
+    ('formatv0/.hg/00manifest.i',
+     '000000000000003000000000000000000000000000000000000000'
+     '000000000000000000000000000000000000000000000000000000'
+     '0000aca95a9a5f550605b6a84783b7ab56678ad65f58'),
+    ('formatv0/.hg/00manifest.d',
+     '75656d707479006238306465356431333837353835343163356630'
+     '35323635616431343461623966613836643164620a'),
+    ('formatv0/.hg/data/empty.i',
+     '000000000000000000000000000000000000000000000000000000'
+     '000000000000000000000000000000000000000000000000000000'
+     '0000b80de5d138758541c5f05265ad144ab9fa86d1db'),
+    ('formatv0/.hg/data/empty.d',
+     ''),
+]
+
+def makedirs(name):
+    """recursive directory creation"""
+    parent = os.path.dirname(name)
+    if parent:
+        makedirs(parent)
+    os.mkdir(name)
+
+makedirs(os.path.join(*'formatv0/.hg/data'.split('/')))
+
+for name, data in files:
+    f = open(name, 'wb')
+    f.write(data.decode('hex'))
+    f.close()
+
+sys.exit(0)

tests/test-verify

@@ -48,4 +48,12 @@ echo
 echo % verify
 hg verify
 
+cd ..
+
+echo % test revlog format 0
+
+"$TESTDIR/revlog-formatv0.py"
+cd formatv0
+hg verify
+
 exit 0

tests/test-verify.out

@@ -50,3 +50,10 @@ warning: orphan revlog 'data/a.i'
 1 warnings encountered!
 1 integrity errors encountered!
 (first damaged changeset appears to be 0)
+% test revlog format 0
+repository uses revlog format 0
+checking changesets
+checking manifests
+crosschecking files in changesets and manifests
+checking files
+1 files, 1 changesets, 1 total revisions