dev394582 · hub966 · Jul 25, 2026 · Jun 11, 2026 · Jun 19, 2026 · Jun 19, 2026
diff --git a/.b4-cover-template b/.b4-cover-template
@@ -8,4 +8,5 @@ ${diffstat}
 ${range_diff}
 ---
 base-commit: ${base_commit}
+change-id: ${change_id}
 ${prerequisites}
diff --git a/Documentation/MyFirstContribution.adoc b/Documentation/MyFirstContribution.adoc
@@ -1477,6 +1477,11 @@ effect which had not occurred to you. It is always okay to ask for clarification
 if you aren't sure why a change was suggested, or what the reviewer is asking
 you to do.
 
+When replying to review comments, quote only the parts of the message that are
+relevant to your response. It is usually helpful to trim away unrelated context,
+such as large portions of the patch that are not being discussed, while keeping
+enough quoted text for readers to understand what you are responding to.
+
 Make sure your email client has a plaintext email mode and it is turned on; the
 Git list rejects HTML email. Please also follow the mailing list etiquette
 outlined in the

diff --git a/Documentation/RelNotes/2.55.0.adoc b/Documentation/RelNotes/2.55.0.adoc
@@ -85,8 +85,8 @@ Performance, Internal Implementation, Development Support etc.
  * Promisor remote handling has been refactored and fixed in
    preparation for auto-configuration of advertised remotes.
 
- * Rust support is enabled by default (but still allows opting out) in
-   some future version of Git.
+ * Rust support is enabled by default (but still allows opting out);
+   in Git version 3.0, Rust will become mandatory.
 
  * Preparation of the xdiff/ codebase to work with Rust.
 

diff --git a/Documentation/RelNotes/2.56.0.adoc b/Documentation/RelNotes/2.56.0.adoc
@@ -43,6 +43,19 @@ UI, Workflows & Features
    output has been optimized to reserve a column for marks (caret,
    question mark, or asterisk) only when such marks are actually shown.
 
+ * Option parsing with 'git rev-parse --parseopt' and in most 'git'
+   subcommands has been updated to exit with 0 (instead of 129) when the
+   help option ('-h' or '--help') is requested directly by the user,
+   aligning with standard Unix convention.
+
+ * The '[includeIf "condition"]' conditional inclusion facility for
+   configuration files has been taught to use the location of the
+   worktree in its condition.
+
+ * The usage string and SYNOPSIS for 'git fast-export' have been
+   standardized to make them consistent with each other and with other
+   commands.
+
 
 Performance, Internal Implementation, Development Support etc.
 --------------------------------------------------------------
@@ -108,6 +121,91 @@ Performance, Internal Implementation, Development Support etc.
    the generated header file 'hook-list.h' is built before compiling
    files in 'builtin_sources' that depend on it.
 
+ * The repository discovery and repository configuration phases, which
+   were previously intertwined in 'setup.c', have been split.  Repository
+   discovery has been updated to populate a 'struct repo_discovery'
+   without modifying the repository state, which is then taken by
+   repository configuration to initialize the repository, paving the way
+   for clean unification of repository configuration.
+
+ * The 'SubmittingPatches' document has been updated to explicitly
+   describe the expectation for contributors to retract or abandon their
+   patch series when they are no longer pursuing it.
+
+ * The contributor guide has been updated to advise new contributors to
+   trim irrelevant quoted text when replying to review comments, matching
+   the existing advice given to reviewers.
+
+ * The build system has been updated to support building universal macOS
+   binaries when 'Rust' is enabled, by compiling separate static archives
+   for each target triple listed in 'RUST_TARGETS' and combining them
+   using the macOS 'lipo' tool.  The 'git-credential-osxkeychain' helper
+   has been updated to link against '$(RUST_LIB)' when 'Rust' is enabled.
+
+ * The test suite has been updated to use the 'test_grep' helper instead
+   of bare 'grep' for test assertions, allowing file contents to be
+   printed on failure for easier debugging.  A new 'greplint' linter has
+   been introduced to detect and prevent new bare 'grep' assertions from
+   being added to the test suite.
+
+ * The pipelines in 't1410-reflog.sh' have been replaced with the
+   'test_stdout_line_count' helper to avoid suppressing the exit code of
+   'git' commands, ensuring failures are not hidden from the test suite.
+
+ * The cache-scanning loop in 'next_cache_entry()' has been optimized
+   to avoid rescanning already-unpacked index entries, preventing a
+   quadratic performance slow-down when diffing the working tree
+   against a commit with a pathspec matching early index entries.
+
+ * The global configuration variable 'ignore_case' (representing the
+   'core.ignorecase' configuration) has been migrated into 'struct
+   repo_config_values' to tie it to a specific repository instance.
+
+ * The performance of ref updates and reads using the 'reftable' backend
+   in the presence of many deletion tombstone records has been optimized
+   by removing the tombstone suppression flag from the merged iterator
+   and instead skipping tombstones at higher-level call sites where
+   iteration bounds are known.
+
+ * Various code paths have been hardened against potential NULL-pointer
+   dereferences and invalid file descriptor accesses flagged by
+   Coverity.
+
+ * The in-tree 'b4' cover letter template has been updated to include the
+   'change-id' trailer, ensuring that sent tags generated by 'b4' contain
+   the required tracking information for subsequent runs.
+
+ * 'git receive-pack' has been refactored to use ODB transaction
+   interfaces instead of directly managing 'tmp_objdir' for staging
+   incoming objects, bringing it closer to being ODB backend agnostic.
+
+ * The test script 't/t9811-git-p4-label-import.sh' has been
+   modernized to use 'test_path_is_file' and 'test_path_is_missing'
+   instead of raw 'test -f' and '! test -f' calls.
+
+ * A redundant strbuf_reset() call in the 'HAVE_GETDELIM' path of
+   strbuf_getwholeline() has been removed, as getdelim() overwrites the
+   buffer and the length is updated afterward.
+
+ * The object database enumeration interface odb_for_each_object() has
+   been taught to accept object filters, allowing the underlying backends
+   to optimize the traversal by using reachability bitmaps when
+   available.  'git cat-file --batch-all-objects' has been updated to use
+   this generic interface, simplifying its code and avoiding direct
+   access to ODB backend internals.
+
+ * The test script 't/t1100-commit-tree-options.sh' has been modernized
+   by converting test cases to the modern style (using single quotes and
+   tab indentation) and moving the creation of the expected file inside
+   the setup test so it runs under the protection of the test harness.
+
+ * The test script 't/t7614-merge-signoff.sh' has been updated to avoid
+   suppressing the exit code of 'git' commands in a pipe.
+
+ * The 'git rev-list --no-walk' command has been corrected to restore
+   pathspec filtering, which was lost when the streaming walk was
+   refactored.
+
 
 Fixes since v2.55
 -----------------
@@ -215,3 +313,40 @@ Fixes since v2.55
    escape sequences that use colon-separated subfields (e.g., for
    256-color or true-color codes).
    (merge 3792b2aea4 mm/sideband-ansi-sgr-colon-fix later to maint).
+
+ * The 'reftable' code has been hardened against corrupted tables by
+   fixing out-of-bounds writes, out-of-bounds reads, and abort calls
+   during parsing.
+   (merge ca93c27328 ps/reftable-hardening later to maint).
+
+ * A description in the release notes for Git 2.55.0 has been
+   retroactively updated to clarify that Rust support is enabled by
+   default, but still optional, and will become mandatory in Git 3.0.
+   (merge 18b2009d14 jc/relnotes-2.55-rust-fix later to maint).
+
+ * The early-exit optimization in 'paint_down_to_common()' has been
+   gated on the queue being generation-ordered, fixing a bug where
+   'git merge-base' (without '--all') could return incorrect results
+   on repositories with v1 commit graphs and clock skew.
+   (merge ae68032a8d kk/commit-reach-find-all-fix later to maint).
+
+ * The client-side parser of the server-advertised bundle-URI list has
+   been updated to drain the remaining response in order to avoid
+   protocol desynchronization when the server sends a misconfigured list.
+   Also, the server-side has been taught to omit empty configuration
+   values instead of sending invalid key-value lines.
+   (merge 50de1169e4 tc/bundle-uri-empty-fix later to maint).
+
+ * The 'topo_levels' slab was propagated only to the topmost layer of a
+   split commit-graph chain, causing topological levels for commits in
+   base layers to be recomputed during incremental writes.  This has been
+   corrected.
+
+ * The stream-based object signature verification path has been
+   corrected to avoid double-closing the stream on read errors.
+   (merge cfd52a74a0 ps/odb-stream-double-close-fix later to maint).
+
+ * The '-i' shorthand for the '--init' option, which was accepted by the
+   'git submodule update' command until it was broken in a modernization
+   of the option-parsing code, has been restored.
+   (merge ff1da37f58 dm/submodule-update-i-shorthand later to maint).
diff --git a/Documentation/SubmittingPatches b/Documentation/SubmittingPatches
@@ -123,6 +123,20 @@ of review.
   top, it gets merged to the 'master' branch and waits to become part
   of the next major release.
 
+But sometimes things do not work as planned:
+
+. If a mailing list discussion convinces you that your changes aren't
+  ideal, please explicitly retract the topic to save the maintainer
+  time and effort.
+
+. If you must drop a topic due to shifting priorities, lack of time,
+  or other commitments, notify the list as a courtesy so others can
+  take over. Anyone can resurrect the topic later when they have the
+  capacity to do so.
+
+. Topics with unaddressed review comments that remain inactive for
+  four weeks may be discarded by the maintainer.
+
 In the following sections, many techniques and conventions are listed
 to help your patches get reviewed effectively in such a life cycle.
 

diff --git a/Documentation/config.adoc b/Documentation/config.adoc
@@ -146,6 +146,51 @@ refer to linkgit:gitignore[5] for details. For convenience:
 	This is the same as `gitdir` except that matching is done
 	case-insensitively (e.g. on case-insensitive file systems)
 
+`worktree`::
+	The data that follows the keyword `worktree` and a colon is used as a
+	glob pattern. If the working directory of the current worktree matches
+	the pattern, the include condition is met.
++
+The worktree location is the path where files are checked out (as returned
+by `git rev-parse --show-toplevel`). This is different from `gitdir`, which
+matches the `.git` directory path. In a linked worktree, the worktree path
+is the directory where that worktree's files are located, not the main
+repository's `.git` directory.
++
+The pattern uses the same glob syntax as `gitdir` (including `~/`, `./`,
+`**/`, and trailing-`/` prefix matching). This condition will never match
+in a bare repository (which has no worktree).
++
+Unlike `gitdir`, the `worktree` condition currently matches only the
+realpath-resolved worktree location. If the working tree was entered via a
+symbolic link, a pattern that uses the symbolic-link spelling may not match;
+use the real path instead.
++
+This is useful when you want to apply configuration based on where the
+working tree is located on the filesystem. For example, a contributor who
+works on the same project both personally and as an employee can use
+different `user.name` and `user.email` values depending on which directory
+the worktree is checked out under:
++
+----
+[includeIf "worktree:/home/user/work/"]
+    path = ~/.config/git/work.inc
+[includeIf "worktree:/home/user/personal/"]
+    path = ~/.config/git/personal.inc
+----
++
+While `extensions.worktreeConfig` (see linkgit:git-worktree[1]) also supports
+per-worktree configuration, it stores the config inside each repository's
+`.git/config.worktree` file and requires running `git config --worktree`
+inside each worktree individually. In contrast, `includeIf "worktree:..."`
+can be set once in a global or system-level configuration file (e.g.
+`~/.config/git/config`) and applies to all repositories at once based on
+their worktree location.
+
+`worktree/i`::
+	This is the same as `worktree` except that matching is done
+	case-insensitively (e.g. on case-insensitive file systems)
+
 `onbranch`::
 	The data that follows the keyword `onbranch` and a colon is taken to be a
 	pattern with standard globbing wildcards and two additional
@@ -244,6 +289,14 @@ Example
 [includeIf "gitdir:~/to/group/"]
 	path = /path/to/foo.inc
 
+; include if the worktree is at /path/to/project-build
+[includeIf "worktree:/path/to/project-build"]
+	path = build-config.inc
+
+; include for all worktrees inside /path/to/group
+[includeIf "worktree:/path/to/group/"]
+	path = group-config.inc
+
 ; relative paths are always relative to the including
 ; file (if the condition is true); their location is not
 ; affected by the condition

diff --git a/Documentation/git-fast-export.adoc b/Documentation/git-fast-export.adoc
@@ -9,7 +9,7 @@ git-fast-export - Git data exporter
 SYNOPSIS
 --------
 [verse]
-'git fast-export' [<options>] | 'git fast-import'
+'git fast-export' [<options>] [<revision-range>] [[--] <path>...]
 
 DESCRIPTION
 -----------

diff --git a/Makefile b/Makefile
@@ -500,6 +500,14 @@ include shared.mak
 #
 # Building Rust code requires Cargo.
 #
+# Define RUST_TARGETS if you want to cross-compile. If left unspecified, it uses
+# the default Rust target on the system.
+#
+# On macOS, this supports specifying multiple targets, separated by a space.
+# This will produce a Universal static library using `lipo`.
+#
+# Example: RUST_TARGETS="aarch64-apple-darwin x86_64-apple-darwin"
+#
 # == SHA-1 and SHA-256 defines ==
 #
 # === SHA-1 backend ===
@@ -939,16 +947,19 @@ TEST_SHELL_PATH = $(SHELL_PATH)
 
 LIB_FILE = libgit.a
 
+ifndef NO_RUST
 ifdef DEBUG
-RUST_TARGET_DIR = target/debug
+RUST_BUILD_CONFIG = debug
 else
-RUST_TARGET_DIR = target/release
+RUST_BUILD_CONFIG = release
 endif
 
 ifeq ($(uname_S),Windows)
-RUST_LIB = $(RUST_TARGET_DIR)/gitcore.lib
+RUST_LIB_NAME = gitcore.lib
 else
-RUST_LIB = $(RUST_TARGET_DIR)/libgitcore.a
+RUST_LIB_NAME = libgitcore.a
+endif
+RUST_LIB = target/$(RUST_BUILD_CONFIG)/$(RUST_LIB_NAME)
 endif
 
 GITLIBS = common-main.o $(LIB_FILE)
@@ -2601,6 +2612,7 @@ FUZZ_OBJS += oss-fuzz/fuzz-date.o
 FUZZ_OBJS += oss-fuzz/fuzz-pack-headers.o
 FUZZ_OBJS += oss-fuzz/fuzz-pack-idx.o
 FUZZ_OBJS += oss-fuzz/fuzz-parse-attr-line.o
+FUZZ_OBJS += oss-fuzz/fuzz-reftable.o
 FUZZ_OBJS += oss-fuzz/fuzz-url-decode-mem.o
 .PHONY: fuzz-objs
 fuzz-objs: $(FUZZ_OBJS)
@@ -3019,11 +3031,35 @@ scalar$X: scalar.o GIT-LDFLAGS $(GITLIBS)
 $(LIB_FILE): $(LIB_OBJS)
 	$(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^
 
+ifndef NO_RUST
+ifeq ($(RUST_TARGETS),)
 $(RUST_LIB): Cargo.toml $(RUST_SOURCES) $(LIB_FILE)
 	$(QUIET_CARGO)cargo build $(CARGO_ARGS)
+else
+ifneq ($(words $(RUST_TARGETS)),1)
+ifneq ($(uname_S),Darwin)
+$(error Building universal Rust libraries requires macOS (lipo is not available on $(uname_S)))
+endif
+endif
+
+RUST_MEMBER_LIBS = $(foreach target,$(RUST_TARGETS),target/$(target)/$(RUST_BUILD_CONFIG)/$(RUST_LIB_NAME))
+$(RUST_MEMBER_LIBS): target/%/$(RUST_BUILD_CONFIG)/$(RUST_LIB_NAME): Cargo.toml $(RUST_SOURCES) $(LIB_FILE)
+	$(QUIET_CARGO)cargo build $(CARGO_ARGS) --target $*
+
+$(RUST_LIB): $(RUST_MEMBER_LIBS)
+	$(call mkdir_p_parent_template)
+	$(QUIET_GEN)\
+	if test $(words $(RUST_TARGETS)) -gt 1; \
+	then \
+		lipo -create $^ -output $@; \
+	else \
+		cp $< $@; \
+	fi
+endif
 
 .PHONY: rust
 rust: $(RUST_LIB)
+endif
 
 export DEFAULT_EDITOR DEFAULT_PAGER
 
@@ -4074,7 +4110,8 @@ $(LIBGIT_HIDDEN_EXPORT): $(LIBGIT_PARTIAL_EXPORT)
 contrib/libgit-sys/libgitpub.a: $(LIBGIT_HIDDEN_EXPORT)
 	$(AR) $(ARFLAGS) $@ $^
 
-contrib/credential/osxkeychain/git-credential-osxkeychain: contrib/credential/osxkeychain/git-credential-osxkeychain.o $(LIB_FILE) GIT-LDFLAGS
+# When Rust is enabled, git-credential-osxkeychain depends on Rust symbols in $(RUST_LIB)
+contrib/credential/osxkeychain/git-credential-osxkeychain: contrib/credential/osxkeychain/git-credential-osxkeychain.o $(LIB_FILE) $(RUST_LIB) GIT-LDFLAGS
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) \
 		$(filter %.o,$^) $(LIBS) -framework Security -framework CoreFoundation
 

diff --git a/apply.c b/apply.c
@@ -4008,7 +4008,7 @@ static int path_is_beyond_symlink_1(struct apply_state *state, struct strbuf *na
 			struct cache_entry *ce;
 
 			ce = index_file_exists(state->repo->index, name->buf,
-					       name->len, ignore_case);
+					       name->len, repo_ignore_case(the_repository));
 			if (ce && S_ISLNK(ce->ce_mode))
 				return 1;
 		} else {

diff --git a/builtin/add.c b/builtin/add.c
@@ -581,7 +581,7 @@ int cmd_add(int argc,
 		string_list_clear(&only_match_skip_worktree, 0);
 	}
 
-	transaction = odb_transaction_begin(repo->objects);
+	odb_transaction_begin_or_die(repo->objects, &transaction, 0);
 
 	ps_matched = xcalloc(pathspec.nr, 1);
 	if (add_renormalize)