This is v0.99 "Torschlusspanik". This will be the last minor release
before libgit2 v1.0. We expect to only respond to bugs in this release,
to stabilize it for next major release.
It contains significant refactorings, but is expected to be API-compatible
Changes or improvements
When fetching from an anonymous remote using a URL with authentication
information provided in the URL (eg
we would erroneously include the literal URL in the FETCH_HEAD file.
We now remove that to match git's behavior.
Some credential structures, enums and values have been renamed:
git_credential_t. Functions and types beginning with
git_cred_now begin with
git_credential, and constants beginning
GIT_CREDTYPEnow begin with
GIT_CREDENTIAL. The former names
Several function signatures have been changed to return an
indicate error conditions. We encourage you to check them for errors
in the standard way.
The NTLM and Negotiate authentication mechanisms are now supported when
talking to git implementations hosted on Apache or nginx servers.
HEADsymbolic reference can no longer be deleted.
git_merge_driver_source_repono longer returns a
const git_repository *,
it now returns a non-
Relative symbolic links are now supported on Windows when
Servers that provide query parameters with a redirect are now supported.
git_submodule_syncwill now resolve relative URLs.
When creating git endpoint URLs, double-slashes are no longer used when
the given git URL has a trailing slash.
On Windows, a
DllMainfunction is no longer included and thread-local
storage has moved to fiber-local storage in order to prevent race
conditions during shutdown.
The tracing mechanism (
GIT_TRACE) is now enabled by default and does
not need to be explicitly enabled in CMake.
The size of Git objects is now represented by
Binary patches without data can now be parsed.
A configuration snapshot can now be created from another configuration
snapshot, not just a "true" configuration object.
git_commit_with_signatureAPI will now ensure that referenced
objects exist in the object database.
Stash messages containing newlines will now be replaced with spaces;
they will no longer be (erroneously) written to the repository.
git_commit_create_with_signaturenow verifies the commit information
to ensure that it points to a valid tree and valid parents.
git_applyhas an option
GIT_APPLY_CHECKthat will only do a dry-run.
The index and working directory will remain unmodified, and application
will report if it would have worked.
Patches produced by Mercurial (those that lack some git extended headers)
can now be parsed and applied.
Reference locks are obeyed correctly on POSIX platforms, instead of
Patches with empty new files can now be read and applied.
git_apply_to_treecan now correctly apply patches that add new files.
The program data configuration on Windows (
must be owned by an administrator, a system account or the current user
to be read.
git_blob_filtered_contentis now deprecated in favor of
Configuration files can now be included conditionally using the
Checkout can now properly create and remove symbolic links to directories
Stash no longer recomputes trees when committing a worktree, for
Repository templates can now include a
HEADfile to default the
initial default branch.
Some configuration structures, enums and values have been renamed:
The former names are deprecated.
Repositories can now be created at the root of a Windows drive.
Configuration lookups are now more efficiently cached.
git_commit_create_with_signaturenow supports a
which will create a commit without adding a signature.
When a repository lacks an
info"common directory", we will no
longer erroneously return
GIT_ENOTFOUNDfor all attribute lookups.
Several attribute macros have been renamed:
values have been renamed:
former names are deprecated.
git_object_size. The former name is
former name is deprecated.
Several blob creation functions have been renamed:
git_blob_create_frombufferis now named
git_blob_create_fromdiskis now named
git_blob_create_fromworkdiris now named
git_blob_create_fromstreamis now named
git_blob_create_fromstream_commitis now named
git_blob_create_from_stream_commit. The former names are deprecated.
git_oid_iszerois now named
former name is deprecated.
Pattern matching is now done using
for compatibility with git.
The option initialization functions suffixed by
options_init. (For example,
git_checkout_options_init.) The former names are deprecated.
NTLM2 authentication is now supported on non-Windows platforms.
git_cred_sign_callbackcallback is now named
git_cred_ssh_interactive_callbackcallback is now named
Ignore files now:
- honor escaped trailing whitespace.
- do not incorrectly negate sibling paths of a negated pattern.
- honor rules that stop ignoring files after a wildcard
Attribute files now:
- honor leading and trailing whitespace.
- treat paths beginning with
\as absolute only on Windows.
- properly handle escaped characters.
- stop reading macros defined in subdirectories
The C locale is now correctly used when parsing regular expressions.
The system PCRE2 or PCRE regular expression libraries are now used
regcomp_lis not available on the system. If none of these
are available on the system, an included version of PCRE is used.
Wildcards in reference specifications are now supported beyond simply
a bare wildcard (
*) for compatibility with git.
git_ignore_path_is_ignoredis provided a path with a trailing
dir/), it will now treat it as a directory for the
purposes of ignore matching.
Patches that add or remove a file with a space in the path can now
be correctly parsed.
git_remote_completion_typetype is now
The former name is deprecated.
former name is deprecated.
git_transfer_progress_cbcallback is now
git_transfer_progressstructure is now
The former names are deprecated.
The example projects are now contained in a single
for ease of use.
libgit2 now correctly handles more URLs, such as
http://example.com:/repo.git(colon but no port),
http://example.com:8080/(path is /, nonstandard port).
A carefully constructed commit object with a very large number
of parents may lead to potential out-of-bounds writes or
potential denial of service.
The ProgramData configuration file is always read for compatibility
with Git for Windows and Portable Git installations. The ProgramData
location is not necessarily writable only by administrators, so we
now ensure that the configuration file is owned by the administrator
or the current user.
The SSH host key now supports SHA-256 when
The diff format option
GIT_DIFF_FORMAT_PATCH_IDcan now be used to
emit an output like
git_apply_options_initfunction will initialize a
The remote callbacks structure adds a
that is invoked when connecting to a server, so that applications
may edit or replace the URL before connection.
The information about the original
HEADin a rebase operation is
git_rebase_orig_head_name. Its ID is available with
ontoreference name is available with
git_rebase_onto_nameand its ID is available with
ODB backends can now free backend data when an error occurs during its
backend data creation using
Options may be specified to
GIT_REPOSITORY_FOREACH_HEAD_SKIP_REPOwill not skip
the main repository's HEAD reference, while
GIT_REPOSITORY_FOREACH_HEAD_SKIP_WORKTREESwill now skip the
worktree HEAD references.
GIT_OPT_DISABLE_PACK_KEEP_FILE_CHECKSoption can be specified to
git_libgit2_opts()to avoid looking for
.keepfiles that correspond
to packfiles. This setting can improve performance when packfiles are
stored on high-latency filesystems like network filesystems.
Blobs can now be filtered with
git_blob_filter, which allows for
options to be set with
GIT_FILTER_NO_SYSTEM_ATTRIBUTESto disable filtering with system-level
enable filtering with
.gitattributesfiles in the HEAD revision.
git_headlist_cbfunction declaration was removed.
git_time_monotonicAPI is removed.
The erroneously exported
inttypes.hheader was removed.
CVE-2019-1348: the fast-import stream command "feature
export-marks=path" allows writing to arbitrary file paths. As
libgit2 does not offer any interface for fast-import, it is not
susceptible to this vulnerability.
CVE-2019-1349: by using NTFS 8.3 short names, backslashes or
alternate filesystreams, it is possible to cause submodules to
be written into pre-existing directories during a recursive
clone using git. As libgit2 rejects cloning into non-empty
directories by default, it is not susceptible to this
CVE-2019-1350: recursive clones may lead to arbitrary remote
code executing due to improper quoting of command line
arguments. As libgit2 uses libssh2, which does not require us
to perform command line parsing, it is not susceptible to this
CVE-2019-1351: Windows provides the ability to substitute
drive letters with arbitrary letters, including multi-byte
Unicode letters. To fix any potential issues arising from
interpreting such paths as relative paths, we have extended
detection of DOS drive prefixes to accomodate for such cases.
CVE-2019-1352: by using NTFS-style alternative file streams for
the ".git" directory, it is possible to overwrite parts of the
repository. While this has been fixed in the past for Windows,
the same vulnerability may also exist on other systems that
write to NTFS filesystems. We now reject any paths starting
with ".git:" on all systems.
CVE-2019-1353: by using NTFS-style 8.3 short names, it was
possible to write to the ".git" directory and thus overwrite
parts of the repository, leading to possible remote code
execution. While this problem was already fixed in the past for
Windows, other systems accessing NTFS filesystems are
vulnerable to this issue too. We now enable NTFS protecions by
default on all systems to fix this attack vector.
CVE-2019-1354: on Windows, backslashes are not a valid part of
a filename but are instead interpreted as directory separators.
As other platforms allowed to use such paths, it was possible
to write such invalid entries into a Git repository and was
thus an attack vector to write into the ".git" dierctory. We
now reject any entries starting with ".git" on all systems.
CVE-2019-1387: it is possible to let a submodule's git
directory point into a sibling's submodule directory, which may
result in overwriting parts of the Git repository and thus lead
to arbitrary command execution. As libgit2 doesn't provide any
way to do submodule clones natively, it is not susceptible to
this vulnerability. Users of libgit2 that have implemented
recursive submodule clones manually are encouraged to review
their implementation for this vulnerability.
Breaking API changes
- The "private" implementation details of the
git_credstructure have been
moved to a dedicated
git2/sys/cred.hheader, to clarify that the underlying
structures are only provided for custom transport implementers.
The breaking change is that the
usernamemember of the underlying struct
is now hidden, and a new
git_cred_get_usernamefunction has been provided.
Breaking CMake configuration changes
The CMake option to use a system http-parser library, instead of the
bundled dependency, has changed. This is due to a deficiency in
http-parser that we have fixed in our implementation. The bundled
library is now the default, but if you wish to force the use of the
system http-parser implementation despite incompatibilities, you can
The interactions between
streamlined. The detection was moved to a new
USE_SHA1, modeled after
USE_HTTPS, which takes the values "CollisionDetection/Backend/Generic", to
better match how the "hashing backend" is selected, the default (ON) being
"CollisionDetection". If you were using
need to check the value you've used, or switch to the autodetection.
The following individuals provided changes that were included in this
- Aaron Patterson
- Alberto Fanjul
- Anders Borum
- Augie Fackler
- Augustin Fabre
- Ayush Shridhar
- brian m. carlson
- Carlos Martín Nieto
- Dan Skorupski
- Daniel Cohen Gindi
- Dave Lee
- David Brooks
- David Turner
- Denis Laxalde
- Dhruva Krishnamurthy
- Dominik Ritter
- Drew DeVault
- Edward Thomson
- Eric Huss
- Erik Aigner
- Etienne Samson
- Gregory Herrero
- Heiko Voigt
- Ian Hattendorf
- Jacques Germishuys
- Janardhan Pulivarthi
- Jason Haslam
- Johannes Schindelin
- Jordan Wallet
- Josh Bleecher Snyder
- Laurence McGlashan
- Lukas Berk
- Max Kostyukevich
- Patrick Steinhardt
- Remy Suen
- Robert Coup
- Scott Furry
- Sebastian Henke
- Stefan Widgren
- Steve King Jr
- Sven Strickroth
- Tobias Nießen
- Tyler Ang-Wanek
- Tyler Wanek