Fix two warnings from Clang.

Fixes issue #173

Both are about not reading the value stored in a variable.

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

Support root commits

Fix tree-entry attribute convertion (fix corrupted trees)

Fix -Wunused-but-set-variable warnings

Fix memory leak in pack_backend__free

Isolate "writing" refs tests in a temporary folder

Change implementation of refs tests that alter the current repository to make them run against a temporary clone of the test repository

Do not check the folder's size to detect new packfiles at runtime. This
doesn't work on Win32.

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

A root commit is a commit whose branch (usually what HEAD points to)
doesn't exist (yet). This situation can happen when the commit is the
first after 1) a repository is initialized or 2) a orphan checkout has
been performed.

Take this opportunity to remove the symbolic link check, as
git_reference_resolve works on OID refs as well.

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

Typical use is git_reference_resolve(&ref, ref). Currently, if there is
an error, ref will point to NULL, causing the user to lose that
reference.

Always update resolved_ref instead of just on finding an OID ref,
storing the last valid reference in it.

This change helps simplify the code for allowing root commits.

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

Magic constant replaced by direct to-string covertion because of:
1) with value length 6 (040000 - subtree) final tree will be corrupted;
2) for wrong values length <6 final tree will be corrupted too.

As of gcc 4.6 -Wall includes -Wunused-but-set-variable. Use GIT_UNUSED
or remove actually unused variables to prevent those warnings.

index.h: Add IDXENTRY flags needed for index operations

Fix memory leaks in the tests

refs: Allow MERGE_HEAD in normalize_name()

Removed the optional `replace` argument, we now have 4 add methods:

	`git_index_add`: add or update from path
	`git_index_add2`: add or update from struct
	`git_index_append`: add without replacing from path
	`git_index_append2`: add without replacing from struct

Yes, this breaks the bindings.

index: Allow user to toggle whether to replace an index entry

Fix going into infinite loop in read_header_loose()

read_header_loose causes infinite loop on this file:
$ cat ../libcppgit/bin/sample-repo/test_mailbox/.git/objects/8f/e274605cbc740a2a957f44b2722a8a73915a09 | base64
eAErKUpNVTAzYzA0MDAzMVHISUxKzSlmWLgkuyN5+rxr6juMPR2EmN8s7Vl9D6oiN7UkkcHJdLbl
7Z3N/oxfE0W8wrSbuFRkAwDFfBn1

fix solaris build
---
Before this patch the build failure looked like:

...
../../deps/zlib/inffast.c: In function `inflate_fast':
../../deps/zlib/inffast.c:324: warning: visibility attribute not supported in this configuration; ignored
[34/38] c: src/revwalk.c -> build/shared/src/revwalk.c.0.o
../../deps/zlib/inftrees.c: In function `inflate_table':
../../deps/zlib/inftrees.c:330: warning: visibility attribute not supported in this configuration; ignored
[35/38] c: deps/zlib/zutil.c -> build/shared/deps/zlib/zutil.c.0.o
[36/38] c: deps/zlib/trees.c -> build/shared/deps/zlib/trees.c.0.o
../../deps/zlib/zutil.c: In function `zcalloc':
../../deps/zlib/zutil.c:308: warning: visibility attribute not supported in this configuration; ignored
../../deps/zlib/zutil.c: In function `zcfree':
../../deps/zlib/zutil.c:316: warning: visibility attribute not supported in this configuration; ignored
../../deps/zlib/trees.c:1244: warning: visibility attribute not supported in this configuration; ignored
../../deps/zlib/trees.c:1244: warning: visibility attribute not supported in this configuration; ignored
../../deps/zlib/trees.c: In function `_tr_init':
../../deps/zlib/trees.c:410: warning: visibility attribute not supported in this configuration; ignored
../../deps/zlib/trees.c: In function `_tr_align':
../../deps/zlib/trees.c:919: warning: visibility attribute not supported in this configuration; ignored
../../deps/zlib/trees.c: In function `_tr_stored_block':
../../deps/zlib/trees.c:883: warning: visibility attribute not supported in this configuration; ignored

../../deps/zlib/trees.c: In function `_tr_flush_block':
../../deps/zlib/trees.c:1020: warning: visibility attribute not supported in this configuration; ignored
../../deps/zlib/trees.c: In function `_tr_tally':
../../deps/zlib/trees.c:1071: warning: visibility attribute not supported in this configuration; ignored
[37/38] cshlib: build/shared/src/blob.c.0.o build/shared/src/cache.c.0.o build/shared/src/commit.c.0.o build/shared/src/delta-apply.c.0.o build/shared/src/errors.c.0.o build/shared/src/filebuf.c.0.o build/shared/src/fileops.c.0.o build/shared/src/hash.c.0.o build/shared/src/hashtable.c.0.o build/shared/src/index.c.0.o build/shared/src/object.c.0.o build/shared/src/odb.c.0.o build/shared/src/odb_loose.c.0.o build/shared/src/odb_pack.c.0.o build/shared/src/oid.c.0.o build/shared/src/pqueue.c.0.o build/shared/src/refs.c.0.o build/shared/src/repository.c.0.o build/shared/src/revwalk.c.0.o build/shared/src/signature.c.0.o build/shared/src/tag.c.0.o build/shared/src/thread-utils.c.0.o build/shared/src/tree.c.0.o build/shared/src/util.c.0.o build/shared/src/vector.c.0.o build/shared/src/unix/map.c.0.o build/shared/src/backends/hiredis.c.0.o build/shared/src/backends/sqlite.c.0.o build/shared/deps/zlib/adler32.c.0.o build/shared/deps/zlib/deflate.c.0.o build/shared/deps/zlib/inffast.c.0.o build/shared/deps/zlib/inflate.c.0.o build/shared/deps/zlib/inftrees.c.0.o build/shared/deps/zlib/trees.c.0.o build/shared/deps/zlib/zutil.c.0.o build/shared/src/block-sha1/sha1.c.0.o -> build/shared/libgit2.so
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol zcfree: a GOT relative relocation must reference a local symbol
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol zcalloc: a GOT relative relocation must reference a local symbol
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol _length_code: a GOT relative relocation must reference a local symbol
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol _dist_code: a GOT relative relocation must reference a local symbol
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol _length_code: a GOT relative relocation must reference a local symbol
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol _dist_code: a GOT relative relocation must reference a local symbol
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol _dist_code: a GOT relative relocation must reference a local symbol
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol _length_code: a GOT relative relocation must reference a local symbol
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol _dist_code: a GOT relative relocation must reference a local symbol
ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol _dist_code: a GOT relative relocation must reference a local symbol
collect2: ld returned 1 exit status
Waf: Leaving directory `/home/node/src/libgit2/build/shared'
Build failed
 -> task failed (exit status 1): 
        {task 138650764: cshlib blob.c.0.o,cache.c.0.o,commit.c.0.o,delta-apply.c.0.o,errors.c.0.o,filebuf.c.0.o,fileops.c.0.o,hash.c.0.o,hashtable.c.0.o,index.c.0.o,object.c.0.o,odb.c.0.o,odb_loose.c.0.o,odb_pack.c.0.o,oid.c.0.o,pqueue.c.0.o,refs.c.0.o,repository.c.0.o,revwalk.c.0.o,signature.c.0.o,tag.c.0.o,thread-utils.c.0.o,tree.c.0.o,util.c.0.o,vector.c.0.o,map.c.0.o,hiredis.c.0.o,sqlite.c.0.o,adler32.c.0.o,deflate.c.0.o,inffast.c.0.o,inflate.c.0.o,inftrees.c.0.o,trees.c.0.o,zutil.c.0.o,sha1.c.0.o -> libgit2.so}
['/home/node/local/bin/gcc', '', 'src/blob.c.0.o', 'src/cache.c.0.o', 'src/commit.c.0.o', 'src/delta-apply.c.0.o', 'src/errors.c.0.o', 'src/filebuf.c.0.o', 'src/fileops.c.0.o', 'src/hash.c.0.o', 'src/hashtable.c.0.o', 'src/index.c.0.o', 'src/object.c.0.o', 'src/odb.c.0.o', 'src/odb_loose.c.0.o', 'src/odb_pack.c.0.o', 'src/oid.c.0.o', 'src/pqueue.c.0.o', 'src/refs.c.0.o', 'src/repository.c.0.o', 'src/revwalk.c.0.o', 'src/signature.c.0.o', 'src/tag.c.0.o', 'src/thread-utils.c.0.o', 'src/tree.c.0.o', 'src/util.c.0.o', 'src/vector.c.0.o', 'src/unix/map.c.0.o', 'src/backends/hiredis.c.0.o', 'src/backends/sqlite.c.0.o', 'deps/zlib/adler32.c.0.o', 'deps/zlib/deflate.c.0.o', 'deps/zlib/inffast.c.0.o', 'deps/zlib/inflate.c.0.o', 'deps/zlib/inftrees.c.0.o', 'deps/zlib/trees.c.0.o', 'deps/zlib/zutil.c.0.o', 'src/block-sha1/sha1.c.0.o', '-o', '', '/home/node/src/libgit2/build/shared/libgit2.so', '-Wl,-Bstatic', '-Wl,-Bdynamic', '-shared', '-Wl,-h,libgit2.so.0']
...


If helpful, here is the equivalent error with varnish: http://www.varnish-cache.org/trac/ticket/852
and the autoconf/configure handling for the equivalent in python: http://hg.python.org/cpython/file/96e0e79d33de/Modules/zlib/configure#l513

So a better fix would probably be to reproduce that configure logic (see similar in the Varnish patch) ... but I'm not sure if shelling out to the C compiler (however waf spells that) is wanted in wscript here.

It would be great to have a libgit2 release with the quicker fix for Solaris. My actual issue is with building node-gitteh.

Thanks,
Trent

LIBGIT2_VER_MINOR now matches LIBGIT2_VERSION (0.11.0)
---
LIBGIT2_VER_MINOR was left at 10 instead of 11.

LIBGIT2_VER_MINOR was left at 10 instead of 11.

When in the middle of a merge, the index needs to contain several files
with the same name. git_index_insert() used to prevent this by not adding a new entry if an entry with the same name already existed.

Do not return with EINVALIDREFNAME when trying to normalize MERGE_HEAD's
name.

Before this patch the build failure looked like:
    ...
    ../../deps/zlib/inftrees.c:330: warning: visibility attribute not supported in this configuration; ignored
    ...
    ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol zcfree: a GOT relative relocation must reference a local symbol
    ...

Fixes the issue where object lookups were failing right after a pull on
an open repository.

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

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

If we don't create any leaks in the tests, we can use them to search
for leaks in the implementation.

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

Lists all the tag references in a repository using a custom callback.
Includes unit tests courtesy of Emeric Fermas <3

They were backtracking too deep into the filesystem on Linux, where the
tests were running directly on `tmp/`.