On 03/28/2014 03:00 AM, Jeff King wrote:
From: Vicent Marti <tan...@gmail.com>

When pack-objects is computing the reachability bitmap to
serve a fetch request, it can erroneously die() if some of
the UNINTERESTING objects are not present. Upload-pack
throws away HAVE lines from the client for objects we do not
have, but we may have a tip object without all of its
ancestors (e.g., if the tip is no longer reachable and was
new enough to survive a `git prune`, but some of its
reachable objects did get pruned).

Thanks for this patch. It looks pretty sensible.

Unfortunately, I can't provide feedback on running it in production because we've decided to set aside experimenting with bitmaps for a bit. I hope to get back to it in a couple of months.

In the non-bitmap case, we do a revision walk with the HAVE
objects marked as UNINTERESTING. The revision walker
explicitly ignores errors in accessing UNINTERESTING commits
to handle this case (and we do not bother looking at
UNINTERESTING trees or blobs at all).

When we have bitmaps, however, the process is quite
different.  The bitmap index for a pack-objects run is
calculated in two separate steps:

First, we perform an extensive walk from all the HAVEs to
find the full set of objects reachable from them. This walk
is usually optimized away because we are expected to hit an
object with a bitmap during the traversal, which allows us
to terminate early.

Secondly, we perform an extensive walk from all the WANTs,
which usually also terminates early because we hit a commit
with an existing bitmap.

Once we have the resulting bitmaps from the two walks, we
AND-NOT them together to obtain the resulting set of objects
we need to pack.

When we are walking the HAVE objects, the revision walker
does not know that we are walking it only to mark the
results as uninteresting. We strip out the UNINTERESTING flag,
because those objects _are_ interesting to us during the
first walk. We want to keep going to get a complete set of
reachable objects if we can.

We need some way to tell the revision walker that it's OK to
silently truncate the HAVE walk, just like it does for the
UNINTERESTING case. This patch introduces a new
`ignore_missing_links` flag to the `rev_info` struct, which
we set only for the HAVE walk.

It also adds tests to cover UNINTERESTING objects missing
from several positions: a missing blob, a missing tree, and
a missing parent commit. The missing blob already worked (as
we do not care about its contents at all), but the other two
cases caused us to die().

Note that there are a few cases we do not need to test:

   1. We do not need to test a missing tree, with the blob
      still present. Without the tree that refers to it, we
      would not know that the blob is relevant to our walk.

   2. We do not need to test a tip commit that is missing.
      Upload-pack omits these for us (and in fact, we
      complain even in the non-bitmap case if it fails to do

Reported-by: Siddharth Agarwal <s...@fb.com>
Signed-off-by: Vicent Marti <tan...@gmail.com>
Signed-off-by: Jeff King <p...@peff.net>
I believe this should solve the problem you're seeing, and I think any
solution is going to be along these lines.

This covers all code paths that can be triggered by pack-objects.  But
it does not necessarily cover all code paths that a revision walker
might use (e.g., it is still possible to die in try_to_simplify_commit,
but we would never hit that in pack-objects, because we do not do
pathspec limiting).

So it's a tradeoff. On the one hand, leaving it like this creates a flag
in rev_info that may surprise somebody later by not being as generally
useful. On the other hand, covering every die() is extra code churn, and
creates complexity for cases that cannot actually be triggered in
practice (complexity because each site has to decide how to handle a
failure to access the object).

  list-objects.c          |  5 ++++-
  pack-bitmap.c           |  2 ++
  revision.c              |  8 +++++---
  revision.h              |  3 ++-
  t/t5310-pack-bitmaps.sh | 31 +++++++++++++++++++++++++++++++
  5 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/list-objects.c b/list-objects.c
index 206816f..3595ee7 100644
--- a/list-objects.c
+++ b/list-objects.c
@@ -81,8 +81,11 @@ static void process_tree(struct rev_info *revs,
                die("bad tree object");
        if (obj->flags & (UNINTERESTING | SEEN))
-       if (parse_tree(tree) < 0)
+       if (parse_tree(tree) < 0) {
+               if (revs->ignore_missing_links)
+                       return;
                die("bad tree object %s", sha1_to_hex(obj->sha1));
+       }
        obj->flags |= SEEN;
        show(obj, path, name, cb_data);
        me.up = path;
diff --git a/pack-bitmap.c b/pack-bitmap.c
index ae0b57b..91e4101 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -727,8 +727,10 @@ int prepare_bitmap_walk(struct rev_info *revs)
        revs->pending.objects = NULL;
if (haves) {
+               revs->ignore_missing_links = 1;
                haves_bitmap = find_objects(revs, haves, NULL);
+               revs->ignore_missing_links = 0;
if (haves_bitmap == NULL)
                        die("BUG: failed to perform bitmap walk");
diff --git a/revision.c b/revision.c
index 8508550..b3b88e1 100644
--- a/revision.c
+++ b/revision.c
@@ -2929,9 +2929,11 @@ static struct commit *get_revision_1(struct rev_info 
                        if (revs->max_age != -1 &&
                            (commit->date < revs->max_age))
-                       if (add_parents_to_list(revs, commit, &revs->commits, 
NULL) < 0)
-                               die("Failed to traverse parents of commit %s",
-                                   sha1_to_hex(commit->object.sha1));
+                       if (add_parents_to_list(revs, commit, &revs->commits, 
NULL) < 0) {
+                               if (!revs->ignore_missing_links)
+                                       die("Failed to traverse parents of commit 
+                       }
switch (simplify_commit(revs, commit)) {
diff --git a/revision.h b/revision.h
index 1eb94c1..0d997de 100644
--- a/revision.h
+++ b/revision.h
@@ -73,7 +73,8 @@ struct rev_info {
        enum rev_sort_order sort_order;
unsigned int early_output:1,
-                       ignore_missing:1;
+                       ignore_missing:1,
+                       ignore_missing_links:1;
/* Traversal flags */
        unsigned int    dense:1,
diff --git a/t/t5310-pack-bitmaps.sh b/t/t5310-pack-bitmaps.sh
index d3a3afa..caea802 100755
--- a/t/t5310-pack-bitmaps.sh
+++ b/t/t5310-pack-bitmaps.sh
@@ -3,6 +3,10 @@
  test_description='exercise basic bitmap functionality'
  . ./test-lib.sh
+objpath() {
+       echo ".git/objects/$(echo "$1" | sed -e 's|\(..\)|\1/|')"
  test_expect_success 'setup repo with moderate-sized history' '
        for i in $(test_seq 1 10); do
                test_commit $i
@@ -112,6 +116,33 @@ test_expect_success 'fetch (full bitmap)' '
        test_cmp expect actual
+test_expect_success 'create objects for missing-HAVE tests' '
+       blob=$(echo "missing have" | git hash-object -w --stdin) &&
+       tree=$(printf "100644 blob $blob\tfile\n" | git mktree) &&
+       parent=$(echo parent | git commit-tree $tree) &&
+       commit=$(echo commit | git commit-tree $tree -p $parent) &&
+       cat >revs <<-EOF
+       HEAD
+       ^HEAD^
+       ^$commit
+       EOF
+test_expect_success 'pack with missing blob' '
+       rm $(objpath $blob) &&
+       git pack-objects --stdout --revs <revs >/dev/null
+test_expect_success 'pack with missing tree' '
+       rm $(objpath $tree) &&
+       git pack-objects --stdout --revs <revs >/dev/null
+test_expect_success 'pack with missing parent' '
+       rm $(objpath $parent) &&
+       git pack-objects --stdout --revs <revs >/dev/null
  test_lazy_prereq JGIT '
        type jgit

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