The `git_iterator_reset` command has not been working in all cases
particularly when there is a start and end range. This fixes it
and adds tests for it, and also extends it with the ability to
update the start/end range strings when an iterator is reset.
This removes the need to explicitly pass the repo into iterators
where the repo is implied by the other parameters. This moves
the repo to be owned by the parent struct. Also, this has some
iterator related updates to the internal diff API to lay the
groundwork for checkout improvements.
If commit timestamps are off, we're more likely to hit a traversal
where the first path ends up traversing past the root commit of the tree.
If that happens, it's possible that the loop will complete before the second
path marks some of those final parents. This fix keeps track of the root
nodes that are encountered in the traversal, and verify that they are
properly marked.
In the best case, with accurate timestamps, the traversal will continue
to terminate when all the commits are STALE (parents of a merge-base), as
it did before. In the worst case, where one path makes a complete traversal
past a root commit, we will continue the loop until the root commit itself
is marked.
Ahead-behind count is still a valid operation, even if the two
commits don't have a common merge-base. The old implementation was
buggy, so it returned ENOTFOUND. Fixed now.
This could also use PTHREAD_MUTEX_INITIALIZER, but a dynamic initializer seems like a more portable concept, and we won't need another #define on top of git_mutex_init()
Storing 4kB or 8kB in the stack is not very gentle. As this part has
to be linear, put the buffer into the indexer object so we allocate it
once in the heap.
There are many different broken filemodes in the wild so we need to
protect against them and give something useful up the chain. Don't
fail when reading a tree from the ODB but normalize the mode as best
we can.
As 664 is no longer a mode that we consider to be valid and gets
normalized to 644, we can stop accepting it in the treebuilder. The
library won't expose it to the user, so any invalid modes are a bug.
To paraphrase @peff:
You can get both size and type from a packed object reasonably cheaply.
If you have:
* An object that is not a delta; both type and size are available in the
packfile header.
* An object that is a delta. The packfile type will be OBJ_*_DELTA, and
you have to resolve back to the base to find the real type. That means
potentially a lot of packfile index lookups, but each one is
relatively cheap. For the size, you inflate the first few bytes of the
delta, whose header will tell you the resulting size of applying the
delta to the base.
For simplicity, we just decompress the whole delta for now.
