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libgit2 v0.21.4/v0.22.0 发布，Git 开发包

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libgit2 v0.21.4 发布，这是 0.21 系列的最后一个版本，也是个维护版本，强烈建议升级！

bce9484 Fix assert when receiving uncommon sideband packet
4f2d272 ignore: don't leak rules into higher directories
8fce79b ignore: match git's rule negation rules
f888185 ignore: adjust test for negating inside a dir
8de0f1e Merge pull request #2770 from tkelman/patch-1
b38fe6f Fix build of tests with mingw
4058f1c Fix ming32 compilation
04da236 Fix public header on sys/refs.h
dc39d23 Plug possible leak in the openssl locks
3a2c60e ssl: clear the OpenSSL locking function
9c04635 Fix segmentation fault observed on OpenBSD/sparc64

同时还发布了 libgit2 v0.22.0 正式版，此版本包括许多新特性和 bug 修复，主要更新内容如下：

改进：

git_signature_new() now requires a non-empty email address.
Use CommonCrypto libraries for SHA-1 calculation on Mac OS X.
Disable SSL compression and SSLv2 and SSLv3 ciphers in favor of TLSv1in OpenSSL.
The fetch behavior of remotes with autotag set to GIT_REMOTE_DOWNLOAD_TAGS_ALL

has been changed to match git 1.9.0 and later. In this mode, libgit2 now

fetches all tags in addition to whatever else needs to be fetched.
git_checkout() now handles case-changing renames correctly on

case-insensitive filesystems; for example renaming "readme" to "README".
The search for libssh2 is now done via pkg-config instead of acustom search of a few directories.
Add support for core.protectHFS and core.protectNTFS. Add morevalidation for filenames which we write such as references.
The local transport now generates textual progress output likegit-upload-pack does ("counting objects").
git_checkout_index() can now check out an in-memory index that is not

necessarily the repository's index, so you may check out an index

that was produced by git_merge and friends while retaining the cached

information.
Remove the default timeout for receiving / sending data over HTTP usingthe WinHTTP transport layer.
Add SPNEGO (Kerberos) authentication using GSSAPI on Unix systems.
Provide built-in objects for the empty blob (e69de29) and emptytree (4b825dc) objects.
The index' tree cache is now filled upon read-tree and write-treeand the cache is written to disk.
LF -> CRLF filter refuses to handle mixed-EOL files
LF -> CRLF filter now runs when * text = auto (with Git for Windows 1.9.4)
File unlocks are atomic again via rename. Read-only files on Windows aremade read-write if necessary.
Share open packfiles across repositories to share descriptors and mmaps.
Use a map for the treebuilder, making insertion O(1)
The build system now accepts an option EMBED_SSH_PATH which when set

tells it to include a copy of libssh2 at the given location. This is

enabled for MSVC.
Add support for refspecs with the asterisk in the middle of apattern.
Fetching now performs opportunistic updates. To achieve this, we

introduce a difference between active and passive refspecs, which

make git_remote_download() and git_remote_fetch() to take a list of

resfpecs to be the active list, similarly to how git fetch accepts a

list on the command-line.
The THREADSAFE option to build libgit2 with threading support hasbeen flipped to be on by default.
The remote object has learnt to prune remote-tracking branches. If

the remote is configured to do so, this will happen via

git_remote_fetch() . You can also call git_remote_prune() after

connecting or fetching to perform the prune.

API additions

Introduce git_buf_text_is_binary() and git_buf_text_contains_nul() for

consumers to perform binary detection on a git_buf.
git_branch_upstream_remote() has been introduced to provide the

branch..remote configuration value.
Introduce git_describe_commit() and git_describe_workdir() to provide

a description of the current commit (and working tree, respectively)

based on the nearest tag or reference
Introduce git_merge_bases() and the git_oidarray type to expose all

merge bases between two commits.
Introduce git_merge_bases_many() to expose all merge bases between

multiple commits.
Introduce rebase functionality (using the merge algorithm only).

Introduce git_rebase_init() to begin a new rebase session,

git_rebase_open() to open an in-progress rebase session,

git_rebase_commit() to commit the current rebase operation,

git_rebase_next() to apply the next rebase operation,

git_rebase_abort() to abort an in-progress rebase and git_rebase_finish()

to complete a rebase operation.
Introduce git_note_author() and git_note_committer() to get the author

and committer information on a git_note , respectively.
A factory function for ssh has been added which allows to change the

path of the programs to execute for receive-pack and upload-pack on

the server, git_transport_ssh_with_paths() .
The ssh transport supports asking the remote host for accepted

credential types as well as multiple challeges using a single

connection. This requires to know which username you want to connect

as, so this introduces the USERNAME credential type which the ssh

transport will use to ask for the username.
The GIT_EPEEL error code has been introduced when we cannot peel a tag

to the requested object type; if the given object otherwise cannot be

peeled, GIT_EINVALIDSPEC is returned.
Introduce GIT_REPOSITORY_INIT_RELATIVE_GITLINK to use relative paths

when writing gitlinks, as is used by git core for submodules.
git_remote_prune() has been added. See above for description.
Introduce reference transactions, which allow multiple references to

be locked at the same time and updates be queued. This also allows

us to safely update a reflog with arbitrary contents, as we need to

do for stash.

API removals

git_remote_supported_url() and git_remote_is_valid_url() have been

removed as they have become essentially useless with rsync-style ssh paths.
git_clone_into() and git_clone_local_into() have been removed from the

public API in favour of git_clone callbacks .
The option to ignore certificate errors via git_remote_cert_check()

is no longer present. Instead, git_remote_callbacks has gained a new

entry which lets the user perform their own certificate checks.

Breaking API changes

git_cherry_pick() is now git_cherrypick() .
The git_submodule_update() function was renamed to

git_submodule_update_strategy() . git_submodule_update() is now used to

provide functionalty similar to "git submodule update".
git_treebuilder_create() was renamed to git_treebuilder_new() to better

reflect it being a constructor rather than something which writes to

disk.
git_treebuilder_new() (was git_treebuilder_create() ) now takes a

repository so that it can query repository configuration.

Subsequently, git_treebuilder_write() no longer takes a repository.
git_threads_init() and git_threads_shutdown() have been renamed to

git_libgit2_init() and git_libgit2_shutdown() to better explain what

their purpose is, as it's grown to be more than just about threads.
git_libgit2_init() and git_libgit2_shutdown() now return the number of

initializations of the library, so consumers may schedule work on the

first initialization.
The git_transport_register() function no longer takes a priority and takes

a URL scheme name (eg "http") instead of a prefix like "http://"
git_index_name_entrycount() and git_index_reuc_entrycount() now

return size_t instead of unsigned int.
The context_lines and interhunk_lines fields in git_diff _options are

now uint32_t instead of uint16_t . This allows to set them to UINT_MAX ,

in effect asking for "infinite" context e.g. to iterate over all the

unmodified lines of a diff.
git_status_file() now takes an exact path. Use git_status_list_new() if

pathspec searching is needed.
git_note_create() has changed the position of the notes reference

name to match git_note_remove() .
Rename git_remote_load() to git_remote_lookup() to bring it in line

with the rest of the lookup functions.
git_remote_rename() now takes the repository and the remote's

current name. Accepting a remote indicates we want to change it,

which we only did partially. It is much clearer if we accept a name

and no loaded objects are changed.
git_remote_delete() now accepts the repository and the remote's name

instead of a loaded remote.
git_merge_head is now git_annotated_commit , to better reflect its usage

for multiple functions (including rebase)
The git_clone_options struct no longer provides the ignore_cert_errors or

remote_name members for remote customization.

Instead, the git_clone_options struct has two new members, remote_cb and

remote_cb_payload , which allow the caller to completely override the remote

creation process. If needed, the caller can use this callback to give their

remote a name other than the default (origin) or disable cert checking.

The remote_callbacks member has been preserved for convenience, although it

is not used when a remote creation callback is supplied.
The git_clone _options struct now provides repository_cb and

repository_cb_payload to allow the user to create a repository with

custom options.
The git_push struct to perform a push has been replaced with

git_remote_upload() . The refspecs and options are passed as a

function argument. git_push_update_tips() is now also

git_remote_update_tips() and the callbacks are in the same struct as

the rest.
The git_remote_set_transport() function now sets a transport factory function,

rather than a pre-existing transport instance.
The git_transport structure definition has moved into the sys/transport.h

file.
libgit2 no longer automatically sets the OpenSSL locking

functions. This is not something which we can know to do. A

last-resort convenience function is provided in sys/openssl.h,

git_openssl_set_locking() which can be used to set the locking.