libgit2 v0.99.0
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
with v0.28.0.
Changes or improvements
-
When fetching from an anonymous remote using a URL with authentication
information provided in the URL (eghttps://foo:bar@example.com/repo),
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_credis nowgit_credential.git_credtype_tis now
git_credential_t. Functions and types beginning with
git_cred_now begin withgit_credential, and constants beginning
withGIT_CREDTYPEnow begin withGIT_CREDENTIAL. The former names
are deprecated. -
Several function signatures have been changed to return an
intto
indicate error conditions. We encourage you to check them for errors
in the standard way.git_attr_cache_flushgit_error_set_strgit_index_name_cleargit_index_reuc_cleargit_libgit2_versiongit_mempack_resetgit_oid_cpygit_oid_fmtgit_oid_fromrawgit_oid_nfmtgit_oid_pathfmtgit_remote_stopgit_remote_disconnectgit_repository__cleanupgit_repository_set_configgit_repository_set_indexgit_repository_set_odbgit_repository_set_refdbgit_revwalk_resetgit_revwalk_simplify_first_parentgit_revwalk_sortinggit_treebuilder_cleargit_treebuilder_filter
-
The NTLM and Negotiate authentication mechanisms are now supported when
talking to git implementations hosted on Apache or nginx servers. -
The
HEADsymbolic reference can no longer be deleted. -
git_merge_driver_source_repono longer returns aconst git_repository *,
it now returns a non-constgit_repository *. -
Relative symbolic links are now supported on Windows when
core.symlinks
is enabled. -
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
git_object_size_t
instead ofoff_t. -
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. -
The
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 optionGIT_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
being removed. -
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 (
C:\ProgramData\Git\config)
must be owned by an administrator, a system account or the current user
to be read. -
git_blob_filtered_contentis now deprecated in favor ofgit_blob_filter. -
Configuration files can now be included conditionally using the
onbranchconditional. -
Checkout can now properly create and remove symbolic links to directories
on Windows. -
Stash no longer recomputes trees when committing a worktree, for
improved performance. -
Repository templates can now include a
HEADfile to default the
initial default branch. -
Some configuration structures, enums and values have been renamed:
git_cvar_mapis nowgit_configmap,git_cvar_tis now
git_configmap_t,GIT_CVAR_FALSEis nowGIT_CONFIGMAP_FALSE,
GIT_CVAR_TRUEis nowGIT_CONFIGMAP_TRUE,GIT_CVAR_INT32is now
GIT_CONFIGMAP_INT32, andGIT_CVAR_STRINGis nowGIT_CONFIGMAP_STRING.
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 aNULLsignature,
which will create a commit without adding a signature. -
When a repository lacks an
info"common directory", we will no
longer erroneously returnGIT_ENOTFOUNDfor all attribute lookups. -
Several attribute macros have been renamed:
GIT_ATTR_TRUEis now
GIT_ATTR_IS_TRUE,GIT_ATTR_FALSEis nowGIT_ATTR_IS_FALSE,
GIT_ATTR_UNSPECIFIEDis nowGIT_ATTR_IS_UNSPECIFIED. The
attribute enumgit_attr_tis nowgit_attr_value_tand its
values have been renamed:GIT_ATTR_UNSPECIFIED_Tis now
GIT_ATTR_VALUE_UNSPECIFIED,GIT_ATTR_TRUE_Tis now
GIT_ATTR_VALUE_TRUE,GIT_ATTR_FALSE_Tis nowGIT_ATTR_VALUE_FALSE,
andGIT_ATTR_VALUE_Tis nowGIT_ATTR_VALUE_STRING. The
former names are deprecated. -
git_object__sizeis nowgit_object_size. The former name is
deprecated. -
git_tag_create_frombufferis nowgit_tag_create_from_buffer. The
former name is deprecated. -
Several blob creation functions have been renamed:
git_blob_create_frombufferis now namedgit_blob_create_from_buffer,
git_blob_create_fromdiskis now namedgit_blob_create_from_disk,
git_blob_create_fromworkdiris now namedgit_blob_create_from_workdir,
git_blob_create_fromstreamis now namedgit_blob_create_from_stream,
andgit_blob_create_fromstream_commitis now named
git_blob_create_from_stream_commit. The former names are deprecated. -
The function
git_oid_iszerois now namedgit_oid_is_zero. The
former name is deprecated. -
Pattern matching is now done using
wildmatchinstead offnmatch
for compatibility with git. -
The option initialization functions suffixed by
init_optionsare now
suffixed withoptions_init. (For example,git_checkout_init_options
is nowgit_checkout_options_init.) The former names are deprecated. -
NTLM2 authentication is now supported on non-Windows platforms.
-
The
git_cred_sign_callbackcallback is now namedgit_cred_sign_cb.
Thegit_cred_ssh_interactive_callbackcallback is now named
git_cred_ssh_interactive_cb. -
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
whenregcomp_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. -
When
git_ignore_path_is_ignoredis provided a path with a trailing
slash (eg,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. -
The
git_remote_completion_typetype is nowgit_remote_completion_t.
The former name is deprecated. -
The
git_odb_backend_mallocis nowgit_odb_backend_data_alloc. The
former name is deprecated. -
The
git_transfer_progress_cbcallback is nowgit_indexer_progress_cb
and thegit_transfer_progressstructure is nowgit_indexer_progress.
The former names are deprecated. -
The example projects are now contained in a single
lg2executable
for ease of use. -
libgit2 now correctly handles more URLs, such as
http://example.com:/repo.git(colon but no port),
http://example.com(no path),
andhttp://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.
API additions
-
The SSH host key now supports SHA-256 when
GIT_CERT_SSH_SHA256is set. -
The diff format option
GIT_DIFF_FORMAT_PATCH_IDcan now be used to
emit an output likegit patch-id. -
The
git_apply_options_initfunction will initialize a
git_apply_optionsstructure. -
The remote callbacks structure adds a
git_url_resolve_cbcallback
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
available withgit_rebase_orig_head_name. Its ID is available with
git_rebase_orig_head_id. Theontoreference name is available with
git_rebase_onto_nameand its ID is available withgit_rebase_onto_id. -
ODB backends can now free backend data when an error occurs during its
backend data creation usinggit_odb_backend_data_free. -
Options may be specified to
git_repository_foreach_headto control
its behavior: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. -
The
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 withgit_blob_filter_options, including
GIT_FILTER_NO_SYSTEM_ATTRIBUTESto disable filtering with system-level
attributes in/etc/gitattributesandGIT_ATTR_CHECK_INCLUDE_HEADto
enable filtering with.gitattributesfiles in the HEAD revision.
API removals
-
The unused
git_headlist_cbfunction declaration was removed. -
The unused
git_time_monotonicAPI is removed. -
The erroneously exported
inttypes.hheader was removed.
Security Fixes
-
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
vulnerability. -
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
vulnerability. -
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 dedicatedgit2/sys/cred.hheader, to clarify that the underlying
structures are only provided for custom transport implementers.
The breaking change is that theusernamemember of the underlying struct
is now hidden, and a newgit_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
specify-DUSE_HTTP_PARSER=systemto CMake. -
The interactions between
USE_HTTPSandSHA1_BACKENDhave been
streamlined. The detection was moved to a newUSE_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 usingSHA1_BACKENDpreviously, you'll
need to check the value you've used, or switch to the autodetection.
Authors
The following individuals provided changes that were included in this
release:
- Aaron Patterson
- Alberto Fanjul
- Anders Borum
- Augie Fackler
- Augustin Fabre
- Ayush Shridhar
- brian m. carlson
- buddyspike
- Carlos Martín Nieto
- cheese1
- 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
- kas
- kdj0c
- Laurence McGlashan
- lhchavez
- Lukas Berk
- Max Kostyukevich
- Patrick Steinhardt
- pcpthm
- Remy Suen
- Robert Coup
- romkatv
- Scott Furry
- Sebastian Henke
- Stefan Widgren
- Steve King Jr
- Sven Strickroth
- Tobias Nießen
- Tyler Ang-Wanek
- Tyler Wanek