v0.26.8 ------- This as a security release fixing the following list of issues: - The function family `git__strtol` is used to parse integers from a buffer. As the functions do not take a buffer length as argument, they will scan either until the end of the current number or until a NUL byte is encountered. Many callers have been misusing the function and called it on potentially non-NUL-terminated buffers, resulting in possible out-of-bounds reads. Callers have been fixed to use `git__strntol` functions instead and `git__strtol` functions were removed. - The function `git__strntol64` relied on the undefined behavior of signed integer overflows. While the code tried to detect such overflows after they have happened, this is unspecified behavior and may lead to weird behavior on uncommon platforms. - In the case where `git__strntol32` was unable to parse an integer because it doesn't fit into an `int32_t`, it printed an error message containing the string that is currently being parsed. The code didn't truncate the string though, which caused it to print the complete string until a NUL byte is encountered and not only the currently parsed number. In case where the string was not NUL terminated, this could have lead to an out-of-bounds read. - When parsing tags, all unknown fields that appear before the tag message are skipped. This skipping is done by using a plain `strstr(buffer, "\n\n")` to search for the two newlines that separate tag fields from tag message. As it is not possible to supply a buffer length to `strstr`, this call may skip over the buffer's end and thus result in an out of bounds read. As `strstr` may return a pointer that is out of bounds, the following computation of `buffer_end - buffer` will overflow and result in an allocation of an invalid length. Note that when reading objects from the object database, we make sure to always NUL terminate them, making the use of `strstr` safe. - When parsing the "encoding" field of a commit, we may perform an out of bounds read due to using `git__prefixcmp` instead of `git__prefixncmp`. This can result in the parsed commit object containing uninitialized data in both its message encoding and message fields. Note that when reading objects from the object database, we make sure to always NUL terminate them, making the use of `strstr` safe. v0.26.7 ------- This is a security release fixing the following list of issues: - Submodule URLs and paths with a leading "-" are now ignored. This is due to the recently discovered CVE-2018-17456, which can lead to arbitrary code execution in upstream git. While libgit2 itself is not vulnerable, it can be used to inject options in an implementation which performs a recursive clone by executing an external command. - When running repack while doing repo writes, `packfile_load__cb()` could see some temporary files in the directory that were bigger than the usual, and makes `memcmp` overflow on the `p->pack_name` string. This issue was reported and fixed by bisho. - The configuration file parser used unbounded recursion to parse multiline variables, which could lead to a stack overflow. The issue was reported by the oss-fuzz project, issue 10048 and fixed by Nelson Elhage. - The fix to the unbounded recursion introduced a memory leak in the config parser. While this leak was never in a public release, the oss-fuzz project reported this as issue 10127. The fix was implemented by Nelson Elhage and Patrick Steinhardt. - When parsing "ok" packets received via the smart protocol, our parsing code did not correctly verify the bounds of the packets, which could result in a heap-buffer overflow. The issue was reported by the oss-fuzz project, issue 9749 and fixed by Patrick Steinhardt. - The parsing code for the smart protocol has been tightened in general, fixing heap-buffer overflows when parsing the packet type as well as for "ACK" and "unpack" packets. The issue was discovered and fixed by Patrick Steinhardt. - Fixed potential integer overflows on platforms with 16 bit integers when parsing packets for the smart protocol. The issue was discovered and fixed by Patrick Steinhardt. - Fixed potential NULL pointer dereference when parsing configuration files which have "include.path" statements without a value. v0.26.6 ------- This is a security release fixing out-of-bounds reads when processing smart-protocol "ng" packets. When parsing an "ng" packet, we keep track of both the current position as well as the remaining length of the packet itself. But instead of taking care not to exceed the length, we pass the current pointer's position to `strchr`, which will search for a certain character until hitting NUL. It is thus possible to create a crafted packet which doesn't contain a NUL byte to trigger an out-of-bounds read. The issue was discovered by the oss-fuzz project, issue 9406. v0.26.5 ------- This is a security release fixing out-of-bounds reads when reading objects from a packfile. This corresponds to CVE-2018-10887 and CVE-2018-10888, which were both reported by Riccardo Schirone. When packing objects into a single so-called packfile, objects may not get stored as complete copies but instead as deltas against another object "base". A specially crafted delta object could trigger an integer overflow and thus bypass our input validation, which may result in copying memory before or after the base object into the final deflated object. This may lead to objects containing copies of system memory being written into the object database. As the hash of those objects cannot be easily controlled by the attacker, it is unlikely that any of those objects will be valid and referenced by the commit graph. Note that the error could also be triggered by the function `git_apply__patch`. But as this function is not in use outside of our test suite, it is not a possible attack vector. v0.26.4 ------- This is a security release fixing insufficient validation of submodule names (CVE-2018-11235, reported by Etienne Stalmans) and disallows `.gitmodules` files as symlinks. While submodule names come from the untrusted ".gitmodules" file, we blindly append the name to "$GIT_DIR/modules" to construct the final path of the submodule repository. In case the name contains e.g. "../", an adversary would be able to escape your repository and write data at arbitrary paths. In accordance with git, we now enforce some rules for submodule names which will cause libgit2 to ignore these malicious names. Adding a symlink as `.gitmodules` into the index from the workdir or checking out such files is not allowed as this can make a Git implementation write outside of the repository and bypass the `fsck` checks for CVE-2018-11235. libgit2 is not susceptible to CVE-2018-11233. v0.26.3 ------- This is a bugfix release. It includes the following non-exclusive list of improvements, which have been backported from the master branch: * Fix cloning of the libgit2 project with `git clone --recursive` by removing an invalid submodule from our testing data. * Fix endianness of the port in `p_getaddrinfo()`. * Fix handling of negative gitignore rules with wildcards. * Fix handling of case-insensitive negative gitignore rules. * Fix resolving references to a tag if the reference is stored with its fully resolved OID in the packed-refs file. * Fix checkout not treating worktree files as modified when only their mode has changed. * Fix rename detection with `GIT_DIFF_FIND_RENAMES_FROM_REWRITES`. * Enable Windows 7 and earlier to use TLS 1.2. v0.26.2 ------- This is a security release fixing memory handling issues when reading crafted repository index files. The issues allow for possible denial of service due to allocation of large memory and out-of-bound reads. As the index is never transferred via the network, exploitation requires an attacker to have access to the local repository. v0.26.1 --------- This is a security release fixing the following CVEs in the bundled zlib library: * CVE-2016-9843 * CVE-2016-9841 * CVE-2016-9842 * CVE-2016-9840 All users compiling libgit2 with the bundled zlib instead of using the system-provided zlib must upgrade. v0.26 ----- ### Changes or improvements * Support for opening, creating and modifying worktrees. * We can now detect SHA1 collisions resulting from the SHAttered attack. These checks can be enabled at build time via `-DUSE_SHA1DC`. * Fix for missing implementation of `git_merge_driver_source` getters. * Fix for installed pkg-config file being broken when the prefix contains spaces. * We now detect when the hashsum of on-disk objects does not match their expected hashsum. * We now support open-ended ranges (e.g. "master..", "...master") in our revision range parsing code. * We now correctly compute ignores with leading "/" in subdirectories. * We now optionally call `fsync` on loose objects, packfiles and their indexes, loose references and packed reference files. * We can now build against OpenSSL v1.1 and against LibreSSL. * `GIT_MERGE_OPTIONS_INIT` now includes a setting to perform rename detection. This aligns this structure with the default by `git_merge` and `git_merge_trees` when `NULL` was provided for the options. * Improvements for reading index v4 files. * Perform additional retries for filesystem operations on Windows when files are temporarily locked by other processes. ### API additions * New family of functions to handle worktrees: * `git_worktree_list()` lets you look up worktrees for a repository. * `git_worktree_lookup()` lets you get a specific worktree. * `git_worktree_open_from_repository()` lets you get the associated worktree of a repository. a worktree. * `git_worktree_add` lets you create new worktrees. * `git_worktree_prune` lets you remove worktrees from disk. * `git_worktree_lock()` and `git_worktree_unlock()` let you lock respectively unlock a worktree. * `git_repository_open_from_worktree()` lets you open a repository via * `git_repository_head_for_worktree()` lets you get the current `HEAD` for a linked worktree. * `git_repository_head_detached_for_worktree()` lets you check whether a linked worktree is in detached HEAD mode. * `git_repository_item_path()` lets you retrieve paths for various repository files. * `git_repository_commondir()` lets you retrieve the common directory of a repository. * `git_branch_is_checked_out()` allows you to check whether a branch is checked out in a repository or any of its worktrees. * `git_repository_submodule_cache_all()` and `git_repository_submodule_cache_clear()` functions allow you to prime or clear the submodule cache of a repository. * You can disable strict hash verifications via the `GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION` option with `git_libgit2_opts()`. * You can enable us calling `fsync` for various files inside the ".git" directory by setting the `GIT_OPT_ENABLE_FSYNC_GITDIR` option with `git_libgit2_opts()`. * You can now enable "offset deltas" when creating packfiles and negotiating packfiles with a remote server by setting `GIT_OPT_ENABLE_OFS_DELTA` option with `GIT_libgit2_opts()`. * You can now set the default share mode on Windows for opening files using `GIT_OPT_SET_WINDOWS_SHAREMODE` option with `git_libgit2_opts()`. You can query the current share mode with `GIT_OPT_GET_WINDOWS_SHAREMODE`. * `git_transport_smart_proxy_options()' enables you to get the proxy options for smart transports. * The `GIT_FILTER_INIT` macro and the `git_filter_init` function are provided to initialize a `git_filter` structure. ### Breaking API changes * `clone_checkout_strategy` has been removed from `git_submodule_update_option`. The checkout strategy used to clone will be the same strategy specified in `checkout_opts`. v0.25 ------- ### Changes or improvements * Fix repository discovery with `git_repository_discover` and `git_repository_open_ext` to match git's handling of a ceiling directory at the current directory. git only checks ceiling directories when its search ascends to a parent directory. A ceiling directory matching the starting directory will not prevent git from finding a repository in the starting directory or a parent directory. * Do not fail when deleting remotes in the presence of broken global configs which contain branches. * Support for reading and writing git index v4 files * Improve the performance of the revwalk and bring us closer to git's code. * The reference db has improved support for concurrency and returns `GIT_ELOCKED` when an operation could not be performed due to locking. * Nanosecond resolution is now activated by default, following git's change to do this. * We now restrict the set of ciphers we let OpenSSL use by default. * Users can now register their own merge drivers for use with `.gitattributes`. The library also gained built-in support for the union merge driver. * The default for creating references is now to validate that the object does exist. * Add `git_proxy_options` which is used by the different networking implementations to let the caller specify the proxy settings instead of relying on the environment variables. ### API additions * You can now get the user-agent used by libgit2 using the `GIT_OPT_GET_USER_AGENT` option with `git_libgit2_opts()`. It is the counterpart to `GIT_OPT_SET_USER_AGENT`. * The `GIT_OPT_SET_SSL_CIPHERS` option for `git_libgit2_opts()` lets you specify a custom list of ciphers to use for OpenSSL. * `git_commit_create_buffer()` creates a commit and writes it into a user-provided buffer instead of writing it into the object db. Combine it with `git_commit_create_with_signature()` in order to create a commit with a cryptographic signature. * `git_blob_create_fromstream()` and `git_blob_create_fromstream_commit()` allow you to create a blob by writing into a stream. Useful when you do not know the final size or want to copy the contents from another stream. * New flags for `git_repository_open_ext`: * `GIT_REPOSITORY_OPEN_NO_DOTGIT` - Do not check for a repository by appending `/.git` to the `start_path`; only open the repository if `start_path` itself points to the git directory. * `GIT_REPOSITORY_OPEN_FROM_ENV` - Find and open a git repository, respecting the environment variables used by the git command-line tools. If set, `git_repository_open_ext` will ignore the other flags and the `ceiling_dirs` argument, and will allow a NULL `path` to use `GIT_DIR` or search from the current directory. The search for a repository will respect `$GIT_CEILING_DIRECTORIES` and `$GIT_DISCOVERY_ACROSS_FILESYSTEM`. The opened repository will respect `$GIT_INDEX_FILE`, `$GIT_NAMESPACE`, `$GIT_OBJECT_DIRECTORY`, and `$GIT_ALTERNATE_OBJECT_DIRECTORIES`. In the future, this flag will also cause `git_repository_open_ext` to respect `$GIT_WORK_TREE` and `$GIT_COMMON_DIR`; currently, `git_repository_open_ext` with this flag will error out if either `$GIT_WORK_TREE` or `$GIT_COMMON_DIR` is set. * `git_diff_from_buffer()` can create a `git_diff` object from the contents of a git-style patch file. * `git_index_version()` and `git_index_set_version()` to get and set the index version * `git_odb_expand_ids()` lets you check for the existence of multiple objects at once. * The new `git_blob_dup()`, `git_commit_dup()`, `git_tag_dup()` and `git_tree_dup()` functions provide type-specific wrappers for `git_object_dup()` to reduce noise and increase type safety for callers. * `git_reference_dup()` lets you duplicate a reference to aid in ownership management and cleanup. * `git_signature_from_buffer()` lets you create a signature from a string in the format that appear in objects. * `git_tree_create_updated()` lets you create a tree based on another one together with a list of updates. For the covered update cases, it's more efficient than the `git_index` route. * `git_apply_patch()` applies hunks from a `git_patch` to a buffer. * `git_diff_to_buf()` lets you print an entire diff directory to a buffer, similar to how `git_patch_to_buf()` works. * `git_proxy_init_options()` is added to initialize a `git_proxy_options` structure at run-time. * `git_merge_driver_register()`, `git_merge_driver_unregister()` let you register and unregister a custom merge driver to be used when `.gitattributes` specifies it. * `git_merge_driver_lookup()` can be used to look up a merge driver by name. * `git_merge_driver_source_repo()`, `git_merge_driver_source_ancestor()`, `git_merge_driver_source_ours()`, `git_merge_driver_source_theirs()`, `git_merge_driver_source_file_options()` added as accessors to `git_merge_driver_source`. ### API removals * `git_blob_create_fromchunks()` has been removed in favour of `git_blob_create_fromstream()`. ### Breaking API changes * `git_packbuilder_object_count` and `git_packbuilder_written` now return a `size_t` instead of a `uint32_t` for more thorough compatibility with the rest of the library. * `git_packbuiler_progress` now provides explicitly sized `uint32_t` values instead of `unsigned int`. * `git_diff_file` now includes an `id_abbrev` field that reflects the number of nibbles set in the `id` field. * `git_odb_backend` now has a `freshen` function pointer. This optional function pointer is similar to the `exists` function, but it will update a last-used marker. For filesystem-based object databases, this updates the timestamp of the file containing the object, to indicate "freshness". If this is `NULL`, then it will not be called and the `exists` function will be used instead. * `git_remote_connect()` now accepts `git_proxy_options` argument, and `git_fetch_options` and `git_push_options` each have a `proxy_opts` field. * `git_merge_options` now provides a `default_driver` that can be used to provide the name of a merge driver to be used to handle files changed during a merge. v0.24 ------- ### Changes or improvements * Custom merge drivers can now be registered, which allows callers to configure callbacks to honor `merge=driver` configuration in `.gitattributes`. * Custom filters can now be registered with wildcard attributes, for example `filter=*`. Consumers should examine the attributes parameter of the `check` function for details. * Symlinks are now followed when locking a file, which can be necessary when multiple worktrees share a base repository. * You can now set your own user-agent to be sent for HTTP requests by using the `GIT_OPT_SET_USER_AGENT` with `git_libgit2_opts()`. * You can set custom HTTP header fields to be sent along with requests by passing them in the fetch and push options. * Tree objects are now assumed to be sorted. If a tree is not correctly formed, it will give bad results. This is the git approach and cuts a significant amount of time when reading the trees. * Filter registration is now protected against concurrent registration. * Filenames which are not valid on Windows in an index no longer cause to fail to parse it on that OS. * Rebases can now be performed purely in-memory, without touching the repository's workdir. * When adding objects to the index, or when creating new tree or commit objects, the inputs are validated to ensure that the dependent objects exist and are of the correct type. This object validation can be disabled with the GIT_OPT_ENABLE_STRICT_OBJECT_CREATION option. * The WinHTTP transport's handling of bad credentials now behaves like the others, asking for credentials again. ### API additions * `git_config_lock()` has been added, which allow for transactional/atomic complex updates to the configuration, removing the opportunity for concurrent operations and not committing any changes until the unlock. * `git_diff_options` added a new callback `progress_cb` to report on the progress of the diff as files are being compared. The documentation of the existing callback `notify_cb` was updated to reflect that it only gets called when new deltas are added to the diff. * `git_fetch_options` and `git_push_options` have gained a `custom_headers` field to set the extra HTTP header fields to send. * `git_stream_register_tls()` lets you register a callback to be used as the constructor for a TLS stream instead of the libgit2 built-in one. * `git_commit_header_field()` allows you to look up a specific header field in a commit. * `git_commit_extract_signature()` extracts the signature from a commit and gives you both the signature and the signed data so you can verify it. ### API removals * No APIs were removed in this version. ### Breaking API changes * The `git_merge_tree_flag_t` is now `git_merge_flag_t`. Subsequently, its members are no longer prefixed with `GIT_MERGE_TREE_FLAG` but are now prefixed with `GIT_MERGE_FLAG`, and the `tree_flags` field of the `git_merge_options` structure is now named `flags`. * The `git_merge_file_flags_t` enum is now `git_merge_file_flag_t` for consistency with other enum type names. * `git_cert` descendent types now have a proper `parent` member * It is the responsibility of the refdb backend to decide what to do with the reflog on ref deletion. The file-based backend must delete it, a database-backed one may wish to archive it. * `git_config_backend` has gained two entries. `lock` and `unlock` with which to implement the transactional/atomic semantics for the configuration backend. * `git_index_add` and `git_index_conflict_add()` will now use the case as provided by the caller on case insensitive systems. Previous versions would keep the case as it existed in the index. This does not affect the higher-level `git_index_add_bypath` or `git_index_add_frombuffer` functions. * The `notify_payload` field of `git_diff_options` was renamed to `payload` to reflect that it's also the payload for the new progress callback. * The `git_config_level_t` enum has gained a higher-priority value `GIT_CONFIG_LEVEL_PROGRAMDATA` which represent a rough Windows equivalent to the system level configuration. * `git_rebase_options` now has a `merge_options` field. * The index no longer performs locking itself. This is not something users of the library should have been relying on as it's not part of the concurrency guarantees. * `git_remote_connect()` now takes a `custom_headers` argument to set the extra HTTP header fields to send. v0.23 ------ ### Changes or improvements * 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. * `git_submodule` instances are no longer cached or shared across lookup. Each submodule represents the configuration at the time of loading. * The index now uses diffs for `add_all()` and `update_all()` which gives it a speed boost and closer semantics to git. * The ssh transport now reports the stderr output from the server as the error message, which allows you to get the "repository not found" messages. * `git_index_conflict_add()` will remove staged entries that exist for conflicted paths. * The flags for a `git_diff_file` will now have the `GIT_DIFF_FLAG_EXISTS` bit set when a file exists on that side of the diff. This is useful for understanding whether a side of the diff exists in the presence of a conflict. * The constructor for a write-stream into the odb now takes `git_off_t` instead of `size_t` for the size of the blob, which allows putting large files into the odb on 32-bit systems. * The remote's push and pull URLs now honor the url.$URL.insteadOf configuration. This allows modifying URL prefixes to a custom value via gitconfig. * `git_diff_foreach`, `git_diff_blobs`, `git_diff_blob_to_buffer`, and `git_diff_buffers` now accept a new binary callback of type `git_diff_binary_cb` that includes the binary diff information. * The race condition mitigations described in `racy-git.txt` have been implemented. * If libcurl is installed, we will use it to connect to HTTP(S) servers. ### API additions * 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. * A push operation will notify the caller of what updates it indends to perform on the remote, which provides similar information to git's pre-push hook. * `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. * A new error code `GIT_EEOF` indicates an early EOF from the server. This typically indicates an error with the URL or configuration of the server, and tools can use this to show messages about failing to communicate with the server. * A new error code `GIT_EINVALID` indicates that an argument to a function is invalid, or an invalid operation was requested. * `git_diff_index_to_workdir()` and `git_diff_tree_to_index()` will now produce deltas of type `GIT_DELTA_CONFLICTED` to indicate that the index side of the delta is a conflict. * The `git_status` family of functions will now produce status of type `GIT_STATUS_CONFLICTED` to indicate that a conflict exists for that file in the index. * `git_index_entry_is_conflict()` is a utility function to determine if a given index entry has a non-zero stage entry, indicating that it is one side of a conflict. * It is now possible to pass a keypair via a buffer instead of a path. For this, `GIT_CREDTYPE_SSH_MEMORY` and `git_cred_ssh_key_memory_new()` have been added. * `git_filter_list_contains` will indicate whether a particular filter will be run in the given filter list. * `git_commit_header_field()` has been added, which allows retrieving the contents of an arbitrary header field. * `git_submodule_set_branch()` allows to set the configured branch for a submodule. ### API removals * `git_remote_save()` and `git_remote_clear_refspecs()` have 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 and the remote no longer stores this configuration. * `git_remote_set_fetch_refpecs()` and `git_remote_set_push_refspecs()` have been removed. There is no longer a way to set the base refspecs at run-time. * `git_submodule_save()` has been removed. The submodules are no longer configured via the objects. * `git_submodule_reload_all()` has been removed as we no longer cache submodules. ### Breaking API changes * `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 a `git_checkout_options` struct that will be used for functions that modify the working directory, namely `git_rebase_init`, `git_rebase_next` and `git_rebase_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 remote callbacks has gained a new member `push_negotiation` which gets called before sending the update commands to the server. * The following functions no 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()` and * `git_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 pointer to fetch options which determine the runtime configuration. * The `git_remote_autotag_option_t` values have been changed. It has gained a `_UNSPECIFIED` 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. * `git_remote_create_anonymous()` no longer takes a fetch refspec as url-only remotes cannot have configured refspecs. * The `git_submodule_update_options` struct now has fetch options in the `fetch_opts` field instead of callbacks in the `remote_callbacks` field. * The following functions no longer act on a submodule instance but change the repository's configuration. Their signatures have changed accordingly: * `git_submodule_set_url()`, `git_submodule_set_ignore()`, `git_submodule_set_update()`, `git_submodule_set_fetch_recurse_submodules()`. * `git_submodule_status()` no longer takes a submodule instance but a repsitory, a submodule name and an ignore setting. * 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_EMERGECONFLICT` is now `GIT_ECONFLICT`, which more accurately describes the nature of the error. * It is no longer allowed to call `git_buf_grow()` on buffers borrowing the memory they point to. v0.22 ------ ### Changes or improvements * `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. ### 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.<name>.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.