Although write_index() supports writing extended header versions for
index, this was never done as there was no check for extended index
entries.

Introduce function is_index_extended() that checks whether an index
contains extended entries and check whether an index is extended before
writing it to disk, adjusting its version number if necessary.

As libgit2 separates an index entry's 32-bit flag into two 16-bit values
flags and flags_extended, the values of flags_extended need to be
adjusted.

Add several IDXENTRY flags that need to be checked in
order to properly implement update-index --refresh.

The git test repository was holding a wrongly named tag reference ("very-simple") pointing at a tag named "e90810b".
This mistake (mine :-/ ) originates back to https://github.com/libgit2/libgit2/commit/9282e92

Whole credit goes to @tclem for having spotted this.

Streaming writes will no longer fail when writing to a backend that
doesn't support streaming writes but supports direct ones.
Now we create a fake stream on memory and then write it as a single
block using the backend `write` callback.

Creates a tree by scanning the index file. The method handles recursive
creation of trees for subdirectories and adds them to the parent tree.

Conflicts:
	include/git2/tag.h
	src/tag.c

Signed-off-by: Vicent Marti <tanoku@gmail.com>

To build libgit2 with sqlite support, waf configure should be run
with --with-sqlite

If we want debugging symbols, we most likely want them to point to the
right place. With -O2, gdb or valgrind may give wrong information.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

res/dummy/a and refs/stash must pass. The other rules are already
tested by the rest of the checks.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Allow any well-formed reference name to live under refs/ removing the
condition that they be under refs/{heads,tags,remotes}/ as was the
design of git.

An exception is made for HEAD which is allowed to contain an OID
reference in detached HEAD state.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Internal methods are static and without the git prefix.
'Force' methods have a `_f` prefix to match the other 'force' methods.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Add internal reference create and rename functions which take a force
parameter, telling them to overwrite an existing reference if it
exists.

These functions try to update the reference if it's of the same type
as the one it's going to be replaced by. Otherwise the old reference
becomes invalid.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Apologies for the massive changes in the external API (that's my fault),
and for the terrible codename for this release (that's @tclem's fault).

The detailed overview for the major API changes can be found in the
commit at 72a3fe42.

Major new features in this release:

	- Real caching and refcounting on parsed objects
	- Real caching and refcounting on objects read from the ODB
	- Streaming writes & reads from the ODB
	- Single-method writes for all object types
	- The external API is now partially thread-safe
	- Improved reference handling
	- New method to list references
	- ZLib is now built-in
	- Improvements to the Revision Walker
	- Tons of bug fixes

Thanks to all the contributors who make this possible.

Signed-off-by: Vicent Marti <tanoku@gmail.com>