The user may decide to return any type of credential, including ones we
did not say we support. Add a check to make sure the user returned an
object of the right type and error out if not.

Fix build on mingw (master branch)

stash: correctly stash wd modified/index deleted

Remove the signature from ref-modifying functions

We want to use the "checkout: moving from ..." message in order to let
git know when a change of branch has happened. Make the convenience
functions for this goal write this message.

We always use "update by push".

This namespace is about behaving like git's branch command, so let's do
exactly that instead of taking a reflog message.

This override is still available via the reference namespace.

This function is meant to simulate what git does in the reset command,
so we should include the reflog message in that.

The signature for the reflog is not something which changes
dynamically. Almost all uses will be NULL, since we want for the
repository's default identity to be used, making it noise.

In order to allow for changing the identity, we instead provide
git_repository_set_ident() and git_repository_ident() which allow a user
to override the choice of signature.

describe example: function to add commits to opts

Allow checkout to handle newly cloned repositories, remove `GIT_CHECKOUT_SAFE_CREATE`

We want to ignore GIT_ENOTFOUND, but for that we need to capture the
error code from the reflog deletion.

git_branch_delete() should ignore errors from non-existing reflogs

win32: add the patch level to the .dll fileversion

Win32 DLLs have four fields for the version number (major, minor,
teeny, patch).  If a consumer wants to build a custom DLL, it may
be useful to set the patchlevel version number in the DLL.

This value only affects the DLL version number, it does not affect
the resultant "version number", which remains major.minor.teeny.

It's currently required in src/openssl_stream.c only.

Windows headers #define some names that openssl uses too. Openssl
headers #undef the offending names before reusing them. But if those
offending Windows headers get included after the openssl headers the
namespace is polluted and nothing good happens.

Fixes issue #2850.

This mainly concerns mingw build.

Update to clar 2b73f5e

rebase: check alloc result

When the repository does not contain an index, emulate git's behavior
and upgrade to `SAFE_CREATE`.  This allows us to check out repositories
created with `git clone --no-checkout`.

README: provide some more explanation about TLS

Fix MAX 32 bit build problem described in libgit2/libgit2#2917

Fix race in git_packfile_unpack.

Streaming filters

Introduce GITTEST_INVASIVE_FS_STRUCTURE for things that are invasive
to your filesystem structure (like creating folders at your filesystem
root) and GITTEST_INVASIVE_FS_SIZE for things that write lots of data.