Added tests exercising git_reference_write() to create a new symbolic reference and a new object id reference.

The git_odb_backend_* symbols were being redefined as external.

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

It can now be run twice in a row without failing.

Configure again the build system to look for SQLite3. If the library is
found, the SQLite backend will be automatically compiled.

Enjoy *very* fast reads and writes.

MASTER PROTIP: Initialize the backend with ":memory" as the path to the
SQLite database for fully-hosted in-memory repositories. Rejoice.

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

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

 - Added a test to ensure that a nested symbolic reference is properly resolved.
 - Added comparisons of object ids.

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

The `dirname` and `dirbase` methods have been replaced with the Android
implementation, which is actually compilant to some kind of standard.

A new method `topdir` has been added, which returns the topmost
directory in a path.

These changes fix issue #49:

	`gitfo_prettify_dir_path` converts "./.git/" to ".git/", so
	the code at src/repository.c:190 goes out of bounds when
	trying to find the topmost directory.

	The new `git__topdir` method handles this gracefully, and the
	fixed `git__dirname` now returns the proper value for the
	repository's working dir.

	E.g.

		/repo/.git/ ==> working dir '/repo/'
		.git/		==> working dir '.'

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

git_revwalk_next now returns an error code when the iteration is over.
git_repository_index now returns an error code when the index file could
not be opened.

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

Don't allow access to any tree entries whilst the entries array is
unsorted. We keep track on when the array is unsorted, and any methods
that access the array while it is unsorted now sort the array before
accessing it.

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

If plain strcmp is used, as this code did before, the final sorting may
end up different from what git-add would do (for example, 'boost'
appearing before 'boost-build.jam', because Git sorts as if it were
spelled 'boost/').

If the sorting is incorrect like this, Git 1.7.4 insists that unmodified
files have been modified.  For example, my test repository has these
four entries:

drwxr-xr-x  199 johnw  wheel   6766 Feb  2 17:21 boost
-rw-r--r--    1 johnw  wheel    849 Feb  2 17:22 boost-build.jam
-rw-r--r--    1 johnw  wheel    989 Feb  2 17:21 boost.css
-rw-r--r--    1 johnw  wheel   6308 Feb  2 17:21 boost.png

Here is the output from git-ls-tree for these files, in a commit tree
created using git-add and git-commit:

100644 blob 8b8775433aef73e9e12609610ae2e35cf1e7ec2c    boost-build.jam
100644 blob 986c4050fa96d825a1311c8e871cdcc9a3e0d2c3    boost.css
100644 blob b4d51fcd5c9149fd77f5ca6ed2b6b1b70e8fe24f    boost.png
040000 tree 46537eeaa4d577010f19b1c9e940cae9a670ff5c    boost

Here is the output for the same commit produced using libgit2:

040000 tree c27c0fd1436f28a6ba99acd0a6c17d178ed58288	boost
100644 blob 8b8775433aef73e9e12609610ae2e35cf1e7ec2c	boost-build.jam
100644 blob 986c4050fa96d825a1311c8e871cdcc9a3e0d2c3	boost.css
100644 blob b4d51fcd5c9149fd77f5ca6ed2b6b1b70e8fe24f	boost.png

Due to this reordering, git-status claims the three blobs are always
modified, no matter what I do using git-read-tree or git-reset or
git-checkout to update the index.

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

Reference files can be loaded using Win32 line endings, too.

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

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

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

NIH Enterprises presents: a new testing system based on CuTesT, which is
faster than our previous one and fortunately uses no preprocessing on
the source files, which means we can run that from CMake.

The test suites have been gathered together into bigger files (one file
per suite, testing each of the different submodules of the library).

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

The file was previously failing to be included stand-alone.

Several changes have been committed to allow the user to create
in-memory references and write back to disk. Peeling of symbolic
references has been made explicit. Added getter and setter methods for
all attributes on a reference. Added corresponding documentation.

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

All the commits have been squashed into a single one before refactoring
the final code, to keep everything tidy.

Individual commit messages are as follows:

Added repository reference looking up functionality placeholder.

Added basic reference database definition and caching infrastructure.

Removed useless constant.

Added GIT_EINVALIDREFNAME error and description. Added missing description for GIT_EBAREINDEX.

Added GIT_EREFCORRUPTED error and description.

Added GIT_ETOONESTEDSYMREF error and description.

Added resolving of direct and symbolic references.

Prepared the packed-refs parsing.

Added parsing of the packed-refs file content.

When no loose reference has been found, the full content of the packed-refs file is parsed. All of the new (i.e. not previously parsed as a loose reference) references are eagerly stored in the cached references storage.

The method packed_reference_file__parse() is in deer need of some refactoring. :-)

Extracted to a method the parsing of the peeled target of a tag.

Extracted to a method the parsing of a standard packed ref.

Fixed leaky removal of the cached references.

Ensured that a previously parsed packed reference isn't returned if a more up-to-date loose reference exists.

Enhanced documentation of git_repository_reference_lookup().

Moved some refs related constants from repository.c to refs.h.

Made parsing of a packed tag reference more robust.

Updated git_repository_reference_lookup() documentation.

Added some references to the test repository.

Added some tests covering tag references looking up.

Added some tests covering symbolic and head references looking up.

Added some tests covering packed references looking up.

Made git_repository_open2() and git_repository_open3() benefit from recently added path prettifying function.

Made git_repository_open() and git_repository_init() benefit from recently added path prettifying function.