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1Git 2.34 Release Notes
2======================
3
4Updates since Git 2.33
5----------------------
6
7Backward compatibility notes
8
9 * The "--preserve-merges" option of "git rebase" has been removed.
10
11
12UI, Workflows & Features
13
14 * Pathname expansion (like "~username/") learned a way to specify a
15 location relative to Git installation (e.g. its $sharedir which is
16 $(prefix)/share), with "%(prefix)".
17
18 * The `ort` strategy is used instead of `recursive` as the default
19 merge strategy.
20
21 * The userdiff pattern for "java" language has been updated.
22
23 * "git rebase" by default skips changes that are equivalent to
24 commits that are already in the history the branch is rebased onto;
25 give messages when this happens to let the users be aware of
26 skipped commits, and also teach them how to tell "rebase" to keep
27 duplicated changes.
28
29 * The advice message that "git cherry-pick" gives when it asks
30 conflicted replay of a commit to be resolved by the end user has
31 been updated.
32
33 * After "git clone --recurse-submodules", all submodules are cloned
34 but they are not by default recursed into by other commands. With
35 submodule.stickyRecursiveClone configuration set, submodule.recurse
36 configuration is set to true in a repository created by "clone"
37 with "--recurse-submodules" option.
38
39 * The logic for auto-correction of misspelt subcommands learned to go
40 interactive when the help.autocorrect configuration variable is set
41 to 'prompt'.
42
43 * "git maintenance" scheduler learned to use systemd timers as a
44 possible backend.
45
46 * "git diff --submodule=diff" showed failure from run_command() when
47 trying to run diff inside a submodule, when the user manually
48 removes the submodule directory.
49
50 * "git bundle unbundle" learned to show progress display.
51
52 * In cone mode, the sparse-index code path learned to remove ignored
53 files (like build artifacts) outside the sparse cone, allowing the
54 entire directory outside the sparse cone to be removed, which is
55 especially useful when the sparse patterns change.
56
57 * Taking advantage of the CGI interface, http-backend has been
58 updated to enable protocol v2 automatically when the other side
59 asks for it.
60
61 * The credential-cache helper has been adjusted to Windows.
62
63 * The error in "git help no-such-git-command" is handled better.
64
65 * The unicode character width table (used for output alignment) has
66 been updated.
67
68 * The ref iteration code used to optionally allow dangling refs to be
69 shown, which has been tightened up.
70
71 * "git add", "git mv", and "git rm" have been adjusted to avoid
72 updating paths outside of the sparse-checkout definition unless
73 the user specifies a "--sparse" option.
74
75 * "git repack" has been taught to generate multi-pack reachability
76 bitmaps.
77
78 * "git fsck" has been taught to report mismatch between expected and
79 actual types of an object better.
80
81 * In addition to GnuPG, ssh public crypto can be used for object and
82 push-cert signing. Note that this feature cannot be used with
83 ssh-keygen from OpenSSH 8.7, whose support for it is broken. Avoid
84 using it unless you update to OpenSSH 8.8.
85
86 * "git log --grep=string --author=name" learns to highlight hits just
87 like "git grep string" does.
88
89
90
91Performance, Internal Implementation, Development Support etc.
92
93 * "git bisect" spawned "git show-branch" only to pretty-print the
94 title of the commit after checking out the next version to be
95 tested; this has been rewritten in C.
96
97 * "git add" can work better with the sparse index.
98
99 * Support for ancient versions of cURL library (pre 7.19.4) has been
100 dropped.
101
102 * A handful of tests that assumed implementation details of files
103 backend for refs have been cleaned up.
104
105 * trace2 logs learned to show parent process name to see in what
106 context Git was invoked.
107
108 * Loading of ref tips to prepare for common ancestry negotiation in
109 "git fetch-pack" has been optimized by taking advantage of the
110 commit graph when available.
111
112 * Remind developers that the userdiff patterns should be kept simple
113 and permissive, assuming that the contents they apply are always
114 syntactically correct.
115
116 * The current implementation of GIT_TEST_FAIL_PREREQS is broken in
117 that checking for the lack of a prerequisite would not work. Avoid
118 the use of "if ! test_have_prereq X" in a test script.
119
120 * The revision traversal API has been optimized by taking advantage
121 of the commit-graph, when available, to determine if a commit is
122 reachable from any of the existing refs.
123
124 * "git fetch --quiet" optimization to avoid useless computation of
125 info that will never be displayed.
126
127 * Callers from older advice_config[] based API has been updated to
128 use the newer advice_if_enabled() and advice_enabled() API.
129
130 * Teach "test_pause" and "debug" helpers to allow using the HOME and
131 TERM environment variables the user usually uses.
132
133 * "make INSTALL_STRIP=-s install" allows the installation step to use
134 "install -s" to strip the binaries as they get installed.
135
136 * Code that handles large number of refs in the "git fetch" code
137 path has been optimized.
138
139 * The reachability bitmap file used to be generated only for a single
140 pack, but now we've learned to generate bitmaps for history that
141 span across multiple packfiles.
142
143 * The code to make "git grep" recurse into submodules has been
144 updated to migrate away from the "add submodule's object store as
145 an alternate object store" mechanism (which is suboptimal).
146
147 * The tracing of process ancestry information has been enhanced.
148
149 * Reduce number of write(2) system calls while sending the
150 ref advertisement.
151
152 * Update the build procedure to use the "-pedantic" build when
153 DEVELOPER makefile macro is in effect.
154
155 * Large part of "git submodule add" gets rewritten in C.
156
157 * The run-command API has been updated so that the callers can easily
158 ask the file descriptors open for packfiles to be closed immediately
159 before spawning commands that may trigger auto-gc.
160
161 * An oddball OPTION_ARGUMENT feature has been removed from the
162 parse-options API.
163
164 * The mergesort implementation used to sort linked list has been
165 optimized.
166
167 * Remove external declaration of functions that no longer exist.
168
169 * "git multi-pack-index write --bitmap" learns to propagate the
170 hashcache from original bitmap to resulting bitmap.
171
172 * CI learns to run the leak sanitizer builds.
173
174 * "git grep --recurse-submodules" takes trees and blobs from the
175 submodule repository, but the textconv settings when processing a
176 blob from the submodule is not taken from the submodule repository.
177 A test is added to demonstrate the issue, without fixing it.
178
179 * Teach "git help -c" into helping the command line completion of
180 configuration variables.
181
182 * When "git cmd -h" shows more than one line of usage text (e.g.
183 the cmd subcommand may take sub-sub-command), parse-options API
184 learned to align these lines, even across i18n/l10n.
185
186 * Prevent "make sparse" from running for the source files that
187 haven't been modified.
188
189 * The code path to write a new version of .midx multi-pack index files
190 has learned to release the mmaped memory holding the current
191 version of .midx before removing them from the disk, as some
192 platforms do not allow removal of a file that still has mapping.
193
194 * A new feature has been added to abort early in the test framework.
195
196
197Fixes since v2.33
198-----------------
199
200 * Input validation of "git pack-objects --stdin-packs" has been
201 corrected.
202
203 * Bugfix for common ancestor negotiation recently introduced in "git
204 push" code path.
205
206 * "git pull" had various corner cases that were not well thought out
207 around its --rebase backend, e.g. "git pull --ff-only" did not stop
208 but went ahead and rebased when the history on other side is not a
209 descendant of our history. The series tries to fix them up.
210
211 * "git apply" miscounted the bytes and failed to read to the end of
212 binary hunks.
213
214 * "git range-diff" code clean-up.
215
216 * "git commit --fixup" now works with "--edit" again, after it was
217 broken in v2.32.
218
219 * Use upload-artifacts v1 (instead of v2) for 32-bit linux, as the
220 new version has a blocker bug for that architecture.
221
222 * Checking out all the paths from HEAD during the last conflicted
223 step in "git rebase" and continuing would cause the step to be
224 skipped (which is expected), but leaves MERGE_MSG file behind in
225 $GIT_DIR and confuses the next "git commit", which has been
226 corrected.
227
228 * Various bugs in "git rebase -r" have been fixed.
229
230 * mmap() imitation used to call xmalloc() that dies upon malloc()
231 failure, which has been corrected to just return an error to the
232 caller to be handled.
233
234 * "git diff --relative" segfaulted and/or produced incorrect result
235 when there are unmerged paths.
236
237 * The delayed checkout code path in "git checkout" etc. were chatty
238 even when --quiet and/or --no-progress options were given.
239
240 * "git branch -D <branch>" used to refuse to remove a broken branch
241 ref that points at a missing commit, which has been corrected.
242
243 * Build update for Apple clang.
244
245 * The parser for the "--nl" option of "git column" has been
246 corrected.
247
248 * "git upload-pack" which runs on the other side of "git fetch"
249 forgot to take the ref namespaces into account when handling
250 want-ref requests.
251
252 * The sparse-index support can corrupt the index structure by storing
253 a stale and/or uninitialized data, which has been corrected.
254
255 * Buggy tests could damage repositories outside the throw-away test
256 area we created. We now by default export GIT_CEILING_DIRECTORIES
257 to limit the damage from such a stray test.
258
259 * Even when running "git send-email" without its own threaded
260 discussion support, a threading related header in one message is
261 carried over to the subsequent message to result in an unwanted
262 threading, which has been corrected.
263
264 * The output from "git fast-export", when its anonymization feature
265 is in use, showed an annotated tag incorrectly.
266
267 * Recent "diff -m" changes broke "gitk", which has been corrected.
268
269 * The "git apply -3" code path learned not to bother the lower level
270 merge machinery when the three-way merge can be trivially resolved
271 without the content level merge. This fixes a regression caused by
272 recent "-3way first and fall back to direct application" change.
273
274 * The code that optionally creates the *.rev reverse index file has
275 been optimized to avoid needless computation when it is not writing
276 the file out.
277
278 * "git range-diff -I... <range> <range>" segfaulted, which has been
279 corrected.
280
281 * The order in which various files that make up a single (conceptual)
282 packfile has been reevaluated and straightened up. This matters in
283 correctness, as an incomplete set of files must not be shown to a
284 running Git.
285
286 * The "mode" word is useless in a call to open(2) that does not
287 create a new file. Such a call in the files backend of the ref
288 subsystem has been cleaned up.
289
290 * "git update-ref --stdin" failed to flush its output as needed,
291 which potentially led the conversation to a deadlock.
292
293 * When "git am --abort" fails to abort correctly, it still exited
294 with exit status of 0, which has been corrected.
295
296 * Correct nr and alloc members of strvec struct to be of type size_t.
297
298 * "git stash", where the tentative change involves changing a
299 directory to a file (or vice versa), was confused, which has been
300 corrected.
301
302 * "git clone" from a repository whose HEAD is unborn into a bare
303 repository didn't follow the branch name the other side used, which
304 is corrected.
305
306 * "git cvsserver" had a long-standing bug in its authentication code,
307 which has finally been corrected (it is unclear and is a separate
308 question if anybody is seriously using it, though).
309
310 * "git difftool --dir-diff" mishandled symbolic links.
311
312 * Sensitive data in the HTTP trace were supposed to be redacted, but
313 we failed to do so in HTTP/2 requests.
314
315 * "make clean" has been updated to remove leftover .depend/
316 directories, even when it is not told to use them to compute header
317 dependencies.
318
319 * Protocol v0 clients can get stuck parsing a malformed feature line.
320
321 * A few kinds of changes "git status" can show were not documented.
322 (merge d2a534c515 ja/doc-status-types-and-copies later to maint).
323
324 * The mergesort implementation used to sort linked list has been
325 optimized.
326 (merge c90cfc225b rs/mergesort later to maint).
327
328 * An editor session launched during a Git operation (e.g. during 'git
329 commit') can leave the terminal in a funny state. The code path
330 has updated to save the terminal state before, and restore it
331 after, it spawns an editor.
332 (merge 3d411afabc cm/save-restore-terminal later to maint).
333
334 * "git cat-file --batch" with the "--batch-all-objects" option is
335 supposed to iterate over all the objects found in a repository, but
336 it used to translate these object names using the replace mechanism,
337 which defeats the point of enumerating all objects in the repository.
338 This has been corrected.
339 (merge bf972896d7 jk/cat-file-batch-all-wo-replace later to maint).
340
341 * Recent sparse-index work broke safety against attempts to add paths
342 with trailing slashes to the index, which has been corrected.
343 (merge c8ad9d04c6 rs/make-verify-path-really-verify-again later to maint).
344
345 * The "--color-lines" and "--color-by-age" options of "git blame"
346 have been missing, which are now documented.
347 (merge 8c32856133 bs/doc-blame-color-lines later to maint).
348
349 * The PATH used in CI job may be too wide and let incompatible dlls
350 to be grabbed, which can cause the build&test to fail. Tighten it.
351 (merge 7491ef6198 js/windows-ci-path-fix later to maint).
352
353 * Avoid performance measurements from getting ruined by gc and other
354 housekeeping pauses interfering in the middle.
355 (merge be79131a53 rs/disable-gc-during-perf-tests later to maint).
356
357 * Stop "git add --dry-run" from creating new blob and tree objects.
358 (merge e578d0311d rs/add-dry-run-without-objects later to maint).
359
360 * "git commit" gave duplicated error message when the object store
361 was unwritable, which has been corrected.
362 (merge 4ef91a2d79 ab/fix-commit-error-message-upon-unwritable-object-store later to maint).
363
364 * Recent sparse-index addition, namely any use of index_name_pos(),
365 can expand sparse index entries and breaks any code that walks
366 cache-tree or existing index entries. One such instance of such a
367 breakage has been corrected.
368
369 * The xxdiff difftool backend can exit with status 128, which the
370 difftool-helper that launches the backend takes as a significant
371 failure, when it is not significant at all. Work it around.
372 (merge 571f4348dd da/mergetools-special-case-xxdiff-exit-128 later to maint).
373
374 * Improve test framework around unwritable directories.
375 (merge 5d22e18965 ab/test-cleanly-recreate-trash-directory later to maint).
376
377 * "git push" client talking to an HTTP server did not diagnose the
378 lack of the final status report from the other side correctly,
379 which has been corrected.
380 (merge c5c3486f38 jk/http-push-status-fix later to maint).
381
382 * Update "git archive" documentation and give explicit mention on the
383 compression level for both zip and tar.gz format.
384 (merge c4b208c309 bs/archive-doc-compression-level later to maint).
385
386 * Drop "git sparse-checkout" from the list of common commands.
387 (merge 6a9a50a8af sg/sparse-index-not-that-common-a-command later to maint).
388
389 * "git branch -c/-m new old" was not described to copy config, which
390 has been corrected.
391 (merge 8252ec300e jc/branch-copy-doc later to maint).
392
393 * Squelch over-eager warning message added during this cycle.
394
395 * Fix long-standing shell syntax error in the completion script.
396 (merge 46b0585286 re/completion-fix-test-equality later to maint).
397
398 * Teach "git commit-graph" command not to allow using replace objects
399 at all, as we do not use the commit-graph at runtime when we see
400 object replacement.
401 (merge 095d112f8c ab/ignore-replace-while-working-on-commit-graph later to maint).
402
403 * "git pull --no-verify" did not affect the underlying "git merge".
404 (merge 47bfdfb3fd ar/fix-git-pull-no-verify later to maint).
405
406 * One CI task based on Fedora image noticed a not-quite-kosher
407 construct recently, which has been corrected.
408
409 * "git pull --ff-only" and "git pull --rebase --ff-only" should make
410 it a no-op to attempt pulling from a remote that is behind us, but
411 instead the command errored out by saying it was impossible to
412 fast-forward, which may technically be true, but not a useful thing
413 to diagnose as an error. This has been corrected.
414 (merge 361cb52383 jc/fix-pull-ff-only-when-already-up-to-date later to maint).
415
416 * The way Cygwin emulates a unix-domain socket, on top of which the
417 simple-ipc mechanism is implemented, can race with the program on
418 the other side that wants to use the socket, and briefly make it
419 appear as a regular file before lstat(2) starts reporting it as a
420 socket. We now have a workaround on the side that connects to a
421 unix domain socket.
422
423 * Other code cleanup, docfix, build fix, etc.
424 (merge f188160be9 ab/bundle-remove-verbose-option later to maint).
425 (merge 8c6b4332b4 rs/close-pack-leakfix later to maint).
426 (merge 51b04c05b7 bs/difftool-msg-tweak later to maint).
427 (merge dd20e4a6db ab/make-compdb-fix later to maint).
428 (merge 6ffb990dc4 os/status-docfix later to maint).
429 (merge 100c2da2d3 rs/p3400-lose-tac later to maint).
430 (merge 76f3b69896 tb/aggregate-ignore-leading-whitespaces later to maint).
431 (merge 6e4fd8bfcd tz/doc-link-to-bundle-format-fix later to maint).
432 (merge f6c013dfa1 jc/doc-commit-header-continuation-line later to maint).
433 (merge ec9a37d69b ab/pkt-line-cleanup later to maint).
434 (merge 8650c6298c ab/fix-make-lint-docs later to maint).
435 (merge 1c720357ce ab/test-lib-diff-cleanup later to maint).
436 (merge 6b615dbece ks/submodule-add-message-fix later to maint).
437 (merge 203eb8381a jc/doc-format-patch-clarify-auto-base later to maint).
438 (merge 559664c792 ab/test-lib later to maint).