From 970d5bf11bc96cd6974bf7665d67e1174abe3750 Mon Sep 17 00:00:00 2001
From: Brandon Low <lostlogic@lostlogicx.com>
Date: Tue, 8 Feb 2011 10:43:22 -0800
Subject: [PATCH] midx4: Fix name offsets when generated from idx

This was a nasty bug, glad it got found before release.  Only effected
the server's ability to suggest .idxs so far, but would have effected
any attempt to have bup retrieve objects directly too.

Signed-off-by: Brandon Low <lostlogic@lostlogicx.com>
---
 lib/bup/_helpers.c |  5 ++++-
 lib/bup/git.py     |  2 +-
 lib/bup/t/tgit.py  | 44 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/lib/bup/_helpers.c b/lib/bup/_helpers.c
index 938b7a3..0af9411 100644
--- a/lib/bup/_helpers.c
+++ b/lib/bup/_helpers.c
@@ -330,7 +330,10 @@ static PyObject *merge_into(PyObject *self, PyObject *args)
 	    return NULL;
 	idxs[i]->cur = (struct sha *)&idxs[i]->map[sha_ofs];
 	idxs[i]->end = &idxs[i]->cur[len];
-	idxs[i]->cur_name = (uint32_t *)&idxs[i]->map[name_map_ofs];
+	if (name_map_ofs)
+	    idxs[i]->cur_name = (uint32_t *)&idxs[i]->map[name_map_ofs];
+	else
+	    idxs[i]->cur_name = NULL;
     }
     table_ptr = (uint32_t *)&fmap[12];
     sha_ptr = (struct sha *)&table_ptr[1<<bits];
diff --git a/lib/bup/git.py b/lib/bup/git.py
index 1539711..8a6808e 100644
--- a/lib/bup/git.py
+++ b/lib/bup/git.py
@@ -250,7 +250,7 @@ class PackIdx:
     def exists(self, hash, want_source=False):
         """Return nonempty if the object exists in this index."""
         if hash and (self._idx_from_hash(hash) != None):
-            return want_source and self.name or True
+            return want_source and os.path.basename(self.name) or True
         return None
 
     def __len__(self):
diff --git a/lib/bup/t/tgit.py b/lib/bup/t/tgit.py
index f5e0237..6563037 100644
--- a/lib/bup/t/tgit.py
+++ b/lib/bup/t/tgit.py
@@ -89,6 +89,50 @@ def testpacks():
     WVPASS(r.exists(hashes[6]))
     WVFAIL(r.exists('\0'*20))
 
+
+@wvtest
+def test_pack_name_lookup():
+    os.environ['BUP_MAIN_EXE'] = bupmain = '../../../bup'
+    os.environ['BUP_DIR'] = bupdir = 'pybuptest.tmp'
+    subprocess.call(['rm','-rf', bupdir])
+    git.init_repo(bupdir)
+    git.verbose = 1
+
+    idxnames = []
+
+    w = git.PackWriter()
+    hashes = []
+    for i in range(2):
+        hashes.append(w.new_blob(str(i)))
+    log('\n')
+    idxnames.append(w.close() + '.idx')
+
+    w = git.PackWriter()
+    for i in range(2,4):
+        hashes.append(w.new_blob(str(i)))
+    log('\n')
+    idxnames.append(w.close() + '.idx')
+
+    idxnames = [os.path.basename(ix) for ix in idxnames]
+
+    def verify(r):
+	for i in range(2):
+	    WVPASSEQ(r.exists(hashes[i], want_source=True), idxnames[0])
+	for i in range(2,4):
+	    WVPASSEQ(r.exists(hashes[i], want_source=True), idxnames[1])
+
+    r = git.PackIdxList('pybuptest.tmp/objects/pack')
+    WVPASSEQ(len(r.packs), 2)
+    verify(r)
+    del r
+
+    subprocess.call([bupmain, 'midx', '-f'])
+
+    r = git.PackIdxList('pybuptest.tmp/objects/pack')
+    WVPASSEQ(len(r.packs), 1)
+    verify(r)
+
+
 @wvtest
 def test_long_index():
     w = git.PackWriter()
-- 
2.39.2