Patience and minimal diff drivers can now be used for merges.
Merges can now ignore whitespace changes.
Updated binary identification in CRLF filtering to avoid false positives in UTF-8 files.
Rename and copy detection is enabled for small files.
Checkout can now handle an initial checkout of a repository, making GIT_CHECKOUT_SAFE_CREATE unnecessary for users of clone.
The signature parameter in the ref-modifying functions has been removed. Use git_repository_set_ident() and git_repository_ident() to override the signature to be used.
The local transport now auto-scales the number of threads to use when creating the packfile instead of sticking to one.
Reference renaming now uses the right id for the old value.
The annotated version of branch creation, HEAD detaching and reset allow for specifying the expression from the user to be put into the reflog.
git_rebase_commit now returns GIT_EUNMERGED when you attempt to commit with unstaged changes.
On Mac OS X, we now use SecureTransport to provide the cryptographic support for HTTPS connections insead of OpenSSL.
Checkout can now accept an index for the baseline computations via the baseline_index member.
The configuration for fetching is no longer stored inside the git_remote struct but has been moved to a git_fetch_options. The remote functions now take these options or the callbacks instead of setting them beforehand.
The git_merge_options gained a file_flags member.
Parsing and retrieving a configuration value as a path is exposed via git_config_parse_path() and git_config_get_path() respectively.
git_repository_set_ident() and git_repository_ident() serve to set and query which identity will be used when writing to the reflog.
git_config_entry_free() frees a config entry.
git_config_get_string_buf() provides a way to safely retrieve a string from a non-snapshot configuration.
git_annotated_commit_from_revspec() allows to get an annotated commit from an extended sha synatx string.
git_repository_set_head_detached_from_annotated(), git_branch_create_from_annotated() and git_reset_from_annotated() allow for the caller to provide an annotated commit through which they can control what expression is put into the reflog as the source/target.
git_index_add_frombuffer() can now create a blob from memory buffer and add it to the index which is attached to a repository.
The structure git_fetch_options has been added to determine the runtime configuration for fetching, such as callbacks, pruning and autotag behaviour. It has the runtime initializer git_fetch_init_options().
The enum git_fetch_prune_t has been added, letting you specify the pruning behaviour for a fetch.
git_stash_apply() can now apply a stashed state from the stash list, placing the data into the working directory and index.
git_stash_pop() will apply a stashed state (like git_stash_apply()) but will remove the stashed state after a successful application.
git_remote_save() and git_remote_clear_refspecs() has been removed. Remote's configuration is changed via the configuration directly or through a convenience function which performs changes to the configuration directly.
git_remote_set_callbacks(), git_remote_get_callbacks() and git_remote_set_transport() have been removed a the remote no longer stores this configuration.
git_smart_subtransport_cb now has a param parameter.
The git_merge_options structure member flags has been renamed to tree_flags.
The git_merge_file_options structure member flags is now an unsigned int. It was previously a git_merge_file_flags_t.
GIT_CHECKOUT_SAFE_CREATE has been removed. Most users will generally be able to switch to GIT_CHECKOUT_SAFE, but if you require missing file handling during checkout, you may now use GIT_CHECKOUT_SAFE | GIT_CHECKOUT_RECREATE_MISSING.
The git_clone_options and git_submodule_update_options structures no longer have a signature field.
The following functions have removed the signature and/or log message parameters in favour of git-emulating ones.
git_branch_create(), git_branch_move()git_rebase_init(), git_rebase_abort()git_reference_symbolic_create_matching(), git_reference_symbolic_create(), git_reference_create(), git_reference_create_matching(), git_reference_symbolic_set_target(), git_reference_set_target(), git_reference_rename()git_remote_update_tips(), git_remote_fetch(), git_remote_push()git_repository_set_head(), git_repository_set_head_detached(), git_repository_detach_head()git_reset()git_config_get_entry() now gives back a ref-counted git_config_entry. You must free it when you no longer need it.
git_config_get_string() will return an error if used on a non-snapshot configuration, as there can be no guarantee that the returned pointer is valid.
git_note_default_ref() now uses a git_buf to return the string, as the string is otherwise not guaranteed to stay allocated.
git_rebase_operation_current() will return GIT_REBASE_NO_OPERATION if it is called immediately after creating a rebase session but before you have applied the first patch.
git_rebase_options now contains an optional pointer to git_checkout_options that will be used for functions that modify the working directory, namely git_checkout_init, git_checkout_next and git_checkout_abort. As a result, git_rebase_open now also takes a git_rebase_options and only the git_rebase_init and git_rebase_open functions take a git_rebase_options, where they will persist the options to subsequent git_rebase calls.
The git_clone_options struct now has fetch options in a fetch_opts field instead of remote callbacks in remote_callbacks.
The following functions now longer act on a remote instance but change the repository's configuration. Their signatures have changed accordingly:
git_remote_set_url(), git_remote_seturl()git_remote_add_fetch(), git_remote_add_push() andgit_remote_set_autotag()git_remote_connect() and git_remote_prune() now take a pointer to the callbacks.
git_remote_fetch() and git_remote_download() now take a poitner to fetch options which determine the runtime configuration.
The git_remote_autotag_option_t values have been changed. It has gained a _FALLBACK default value to specify no override for the configured setting.
git_remote_update_tips() now takes a pointer to the callbacks as well as a boolean whether to write FETCH_HEAD and the autotag setting.
The git_submodule_update_options struct now has fetch options in the fetch_opts field instead of callbacks in the remote_callbacks field.
The push function in the git_transport interface now takes a pointer to the remote callbacks.
The git_index_entry struct‘s fields’ types have been changed to more accurately reflect what is in fact stored in the index. Specifically, time and file size are 32 bits intead of 64, as these values are truncated.
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 TLSv1 in 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 a custom search of a few directories.
Add support for core.protectHFS and core.protectNTFS. Add more validation for filenames which we write such as references.
The local transport now generates textual progress output like git-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 using the WinHTTP transport layer.
Add SPNEGO (Kerberos) authentication using GSSAPI on Unix systems.
Provide built-in objects for the empty blob (e69de29) and empty tree (4b825dc) objects.
The index' tree cache is now filled upon read-tree and write-tree and 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 are made 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 a pattern.
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 has been 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.
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.
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.
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.