[git/git.git] / Documentation / RelNotes / 2.17.0.txt
1 Git 2.17 Release Notes
2 ======================
4 Updates since v2.16
5 -------------------
7 UI, Workflows & Features
9 * "diff" family of commands learned "--find-object=<object-id>" option
10 to limit the findings to changes that involve the named object.
12 * "git format-patch" learned to give 72-cols to diffstat, which is
13 consistent with other line length limits the subcommand uses for
14 its output meant for e-mails.
16 * The log from "git daemon" can be redirected with a new option; one
17 relevant use case is to send the log to standard error (instead of
18 syslog) when running it from inetd.
20 * "git rebase" learned to take "--allow-empty-message" option.
22 * "git am" has learned the "--quit" option, in addition to the
23 existing "--abort" option; having the pair mirrors a few other
24 commands like "rebase" and "cherry-pick".
26 * "git worktree add" learned to run the post-checkout hook, just like
27 "git clone" runs it upon the initial checkout.
29 * "git tag" learned an explicit "--edit" option that allows the
30 message given via "-m" and "-F" to be further edited.
32 * "git fetch --prune-tags" may be used as a handy short-hand for
33 getting rid of stale tags that are locally held.
35 * The new "--show-current-patch" option gives an end-user facing way
36 to get the diff being applied when "git rebase" (and "git am")
37 stops with a conflict.
39 * "git add -p" used to offer "/" (look for a matching hunk) as a
40 choice, even there was only one hunk, which has been corrected.
41 Also the single-key help is now given only for keys that are
42 enabled (e.g. help for '/' won't be shown when there is only one
43 hunk).
45 * Since Git 1.7.9, "git merge" defaulted to --no-ff (i.e. even when
46 the side branch being merged is a descendant of the current commit,
47 create a merge commit instead of fast-forwarding) when merging a
48 tag object. This was appropriate default for integrators who pull
49 signed tags from their downstream contributors, but caused an
50 unnecessary merges when used by downstream contributors who
51 habitually "catch up" their topic branches with tagged releases
52 from the upstream. Update "git merge" to default to --no-ff only
53 when merging a tag object that does *not* sit at its usual place in
54 refs/tags/ hierarchy, and allow fast-forwarding otherwise, to
55 mitigate the problem.
57 * "git status" can spend a lot of cycles to compute the relation
58 between the current branch and its upstream, which can now be
59 disabled with "--no-ahead-behind" option.
61 * "git diff" and friends learned funcname patterns for Go language
62 source files.
64 * "git send-email" learned "--reply-to=<address>" option.
66 * Funcname pattern used for C# now recognizes "async" keyword.
68 * In a way similar to how "git tag" learned to honor the pager
69 setting only in the list mode, "git config" learned to ignore the
70 pager setting when it is used for setting values (i.e. when the
71 purpose of the operation is not to "show").
74 Performance, Internal Implementation, Development Support etc.
76 * More perf tests for threaded grep
78 * "perf" test output can be sent to codespeed server.
80 * The build procedure for perl/ part has been greatly simplified by
81 weaning ourselves off of MakeMaker.
83 * Perl 5.8 or greater has been required since Git 1.7.4 released in
84 2010, but we continued to assume some core modules may not exist and
85 used a conditional "eval { require <<module>> }"; we no longer do
86 this. Some platforms (Fedora/RedHat/CentOS, for example) ship Perl
87 without all core modules by default (e.g. Digest::MD5, File::Temp,
88 File::Spec, Net::Domain, Net::SMTP). Users on such platforms may
89 need to install these additional modules.
91 * As a convenience, we install copies of Perl modules we require which
92 are not part of the core Perl distribution (e.g. Error and
93 Mail::Address). Users and packagers whose operating system provides
94 these modules can set NO_PERL_CPAN_FALLBACKS to avoid installing the
95 bundled modules.
97 * In preparation for implementing narrow/partial clone, the machinery
98 for checking object connectivity used by gc and fsck has been
99 taught that a missing object is OK when it is referenced by a
100 packfile specially marked as coming from trusted repository that
101 promises to make them available on-demand and lazily.
103 * The machinery to clone & fetch, which in turn involves packing and
104 unpacking objects, has been told how to omit certain objects using
105 the filtering mechanism introduced by another topic. It now knows
106 to mark the resulting pack as a promisor pack to tolerate missing
107 objects, laying foundation for "narrow" clones.
109 * The first step to getting rid of mru API and using the
110 doubly-linked list API directly instead.
112 * Retire mru API as it does not give enough abstraction over
113 underlying list API to be worth it.
115 * Rewrite two more "git submodule" subcommands in C.
117 * The tracing machinery learned to report tweaking of environment
118 variables as well.
120 * Update Coccinelle rules to catch and optimize strbuf_addf(&buf, "%s", str)
122 * Prevent "clang-format" from breaking line after function return type.
124 * The sequencer infrastructure is shared across "git cherry-pick",
125 "git rebase -i", etc., and has always spawned "git commit" when it
126 needs to create a commit. It has been taught to do so internally,
127 when able, by reusing the codepath "git commit" itself uses, which
128 gives performance boost for a few tens of percents in some sample
129 scenarios.
131 * Push the submodule version of collision-detecting SHA-1 hash
132 implementation a bit harder on builders.
134 * Avoid mmapping small files while using packed refs (especially ones
135 with zero size, which would cause later munmap() to fail).
137 * Conversion from uchar[20] to struct object_id continues.
139 * More tests for wildmatch functions.
141 * The code to binary search starting from a fan-out table (which is
142 how the packfile is indexed with object names) has been refactored
143 into a reusable helper.
145 * We now avoid using identifiers that clash with C++ keywords. Even
146 though it is not a goal to compile Git with C++ compilers, changes
147 like this help use of code analysis tools that targets C++ on our
148 codebase.
150 * The executable is now built in 'script' phase in Travis CI integration,
151 to follow the established practice, rather than during 'before_script'
152 phase. This allows the CI categorize the failures better ('failed'
153 is project's fault, 'errored' is build environment's).
154 (merge 3c93b82920 sg/travis-build-during-script-phase later to maint).
156 * Writing out the index file when the only thing that changed in it
157 is the untracked cache information is often wasteful, and this has
158 been optimized out.
160 * Various pieces of Perl code we have have been cleaned up.
162 * Internal API clean-up to allow write_locked_index() optionally skip
163 writing the in-core index when it is not modified.
166 Also contains various documentation updates and code clean-ups.
169 Fixes since v2.16
170 -----------------
172 * An old regression in "git describe --all $annotated_tag^0" has been
173 fixed.
175 * "git status" after moving a path in the working tree (hence making
176 it appear "removed") and then adding with the -N option (hence
177 making that appear "added") detected it as a rename, but did not
178 report the old and new pathnames correctly.
180 * "git svn dcommit" did not take into account the fact that a
181 svn+ssh:// URL with a username@ (typically used for pushing) refers
182 to the same SVN repository without the username@ and failed when
183 svn.pushmergeinfo option is set.
185 * API clean-up around revision traversal.
187 * "git merge -Xours/-Xtheirs" learned to use our/their version when
188 resolving a conflicting updates to a symbolic link.
190 * "git clone $there $here" is allowed even when here directory exists
191 as long as it is an empty directory, but the command incorrectly
192 removed it upon a failure of the operation.
194 * "git commit --fixup" did not allow "-m<message>" option to be used
195 at the same time; allow it to annotate resulting commit with more
196 text.
198 * When resetting the working tree files recursively, the working tree
199 of submodules are now also reset to match.
201 * "git stash -- <pathspec>" incorrectly blew away untracked files in
202 the directory that matched the pathspec, which has been corrected.
204 * Instead of maintaining home-grown email address parsing code, ship
205 a copy of reasonably recent Mail::Address to be used as a fallback
206 in 'git send-email' when the platform lacks it.
207 (merge d60be8acab mm/send-email-fallback-to-local-mail-address later to maint).
209 * "git add -p" was taught to ignore local changes to submodules as
210 they do not interfere with the partial addition of regular changes
211 anyway.
213 * Avoid showing a warning message in the middle of a line of "git
214 diff" output.
215 (merge 4e056c989f nd/diff-flush-before-warning later to maint).
217 * The http tracing code, often used to debug connection issues,
218 learned to redact potentially sensitive information from its output
219 so that it can be more safely sharable.
220 (merge 8ba18e6fa4 jt/http-redact-cookies later to maint).
222 * Crash fix for a corner case where an error codepath tried to unlock
223 what it did not acquire lock on.
224 (merge 81fcb698e0 mr/packed-ref-store-fix later to maint).
226 * The split-index mode had a few corner case bugs fixed.
227 (merge ae59a4e44f tg/split-index-fixes later to maint).
229 * Assorted fixes to "git daemon".
230 (merge ed15e58efe jk/daemon-fixes later to maint).
232 * Completion of "git merge -s<strategy>" (in contrib/) did not work
233 well in non-C locale.
234 (merge 7cc763aaa3 nd/list-merge-strategy later to maint).
236 * Workaround for segfault with more recent versions of SVN.
237 (merge 7f6f75e97a ew/svn-branch-segfault-fix later to maint).
239 * Plug recently introduced leaks in fsck.
240 (merge ba3a08ca0e jt/fsck-code-cleanup later to maint).
242 * "git pull --rebase" did not pass verbosity setting down when
243 recursing into a submodule.
244 (merge a56771a668 sb/pull-rebase-submodule later to maint).
246 * The way "git reset --hard" reports the commit the updated HEAD
247 points at is made consistent with the way how the commit title is
248 generated by the other parts of the system. This matters when the
249 title is spread across physically multiple lines.
250 (merge 1cf823fb68 tg/reset-hard-show-head-with-pretty later to maint).
252 * Test fixes.
253 (merge 63b1a175ee sg/test-i18ngrep later to maint).
255 * Some bugs around "untracked cache" feature have been fixed. This
256 will notice corrupt data in the untracked cache left by old and
257 buggy code and issue a warning---the index can be fixed by clearing
258 the untracked cache from it.
259 (merge 0cacebf099 nd/fix-untracked-cache-invalidation later to maint).
260 (merge 7bf0be7501 ab/untracked-cache-invalidation-docs later to maint).
262 * "git blame HEAD COPYING" in a bare repository failed to run, while
263 "git blame HEAD -- COPYING" run just fine. This has been corrected.
265 * "git add" files in the same directory, but spelling the directory
266 path in different cases on case insensitive filesystem, corrupted
267 the name hash data structure and led to unexpected results. This
268 has been corrected.
269 (merge c95525e90d bp/name-hash-dirname-fix later to maint).
271 * "git rebase -p" mangled log messages of a merge commit, which is
272 now fixed.
273 (merge ed5144d7eb js/fix-merge-arg-quoting-in-rebase-p later to maint).
275 * Some low level protocol codepath could crash when they get an
276 unexpected flush packet, which is now fixed.
277 (merge bb1356dc64 js/packet-read-line-check-null later to maint).
279 * "git check-ignore" with multiple paths got confused when one is a
280 file and the other is a directory, which has been fixed.
281 (merge d60771e930 rs/check-ignore-multi later to maint).
283 * "git describe $garbage" stopped giving any errors when the garbage
284 happens to be a string with 40 hexadecimal letters.
285 (merge a8e7a2bf0f sb/describe-blob later to maint).
287 * Code to unquote single-quoted string (used in the parser for
288 configuration files, etc.) did not diagnose bogus input correctly
289 and produced bogus results instead.
290 (merge ddbbf8eb25 jk/sq-dequote-on-bogus-input later to maint).
292 * Many places in "git apply" knew that "/dev/null" that signals
293 "there is no such file on this side of the diff" can be followed by
294 whitespace and garbage when parsing a patch, except for one, which
295 made an otherwise valid patch (e.g. ones from subversion) rejected.
296 (merge e454ad4bec tk/apply-dev-null-verify-name-fix later to maint).
298 * We no longer create any *.spec file, so "make clean" should not
299 remove it.
300 (merge 4321bdcabb tz/do-not-clean-spec-file later to maint).
302 * "git push" over http transport did not unquote the push-options
303 correctly.
304 (merge 90dce21eb0 jk/push-options-via-transport-fix later to maint).
306 * "git send-email" learned to complain when the batch-size option is
307 not defined when the relogin-delay option is, since these two are
308 mutually required.
309 (merge 9caa70697b xz/send-email-batch-size later to maint).
311 * Y2k20 fix ;-) for our perl scripts.
312 (merge a40e06ee33 bw/perl-timegm-timelocal-fix later to maint).
314 * Threaded "git grep" has been optimized to avoid allocation in code
315 section that is covered under a mutex.
316 (merge 38ef24dccf rv/grep-cleanup later to maint).
318 * "git subtree" script (in contrib/) scripted around "git log", whose
319 output got affected by end-user configuration like log.showsignature
320 (merge 8841b5222c sg/subtree-signed-commits later to maint).
322 * While finding unique object name abbreviation, the code may
323 accidentally have read beyond the end of the array of object names
324 in a pack.
325 (merge 21abed500c ds/find-unique-abbrev-optim later to maint).
327 * Micro optimization in revision traversal code.
328 (merge ebbed3ba04 ds/mark-parents-uninteresting-optim later to maint).
330 * "git commit" used to run "gc --auto" near the end, which was lost
331 when the command was reimplemented in C by mistake.
332 (merge 095c741edd ab/gc-auto-in-commit later to maint).
334 * Allow running a couple of tests with "sh -x".
335 (merge c20bf94abc sg/cvs-tests-with-x later to maint).
337 * The codepath to replace an existing entry in the index had a bug in
338 updating the name hash structure, which has been fixed.
339 (merge 0e267b7a24 bp/refresh-cache-ent-rehash-fix later to maint).
341 * The transfer.fsckobjects configuration tells "git fetch" to
342 validate the data and connected-ness of objects in the received
343 pack; the code to perform this check has been taught about the
344 narrow clone's convention that missing objects that are reachable
345 from objects in a pack that came from a promissor remote is OK.
347 * There was an unused file-scope static variable left in http.c when
348 building for versions of libCURL that is older than 7.19.4, which
349 has been fixed.
350 (merge b8fd6008ec rj/http-code-cleanup later to maint).
352 * Shell script portability fix.
353 (merge 206a6ae013 ml/filter-branch-portability-fix later to maint).
355 * Other minor doc, test and build updates and code cleanups.
356 (merge e2a5a028c7 bw/oidmap-autoinit later to maint).
357 (merge ec3b4b06f8 cl/t9001-cleanup later to maint).
358 (merge e1b3f3dd38 ks/submodule-doc-updates later to maint).
359 (merge fbac558a9b rs/describe-unique-abbrev later to maint).
360 (merge 8462ff43e4 tb/crlf-conv-flags later to maint).
361 (merge 7d68bb0766 rb/hashmap-h-compilation-fix later to maint).
362 (merge 3449847168 cc/sha1-file-name later to maint).
363 (merge ad622a256f ds/use-get-be64 later to maint).
364 (merge f919ffebed sg/cocci-move-array later to maint).
365 (merge 4e801463c7 jc/mailinfo-cleanup-fix later to maint).
366 (merge ef5b3a6c5e nd/shared-index-fix later to maint).
367 (merge 9f5258cbb8 tz/doc-show-defaults-to-head later to maint).
368 (merge b780e4407d jc/worktree-add-short-help later to maint).
369 (merge ae239fc8e5 rs/cocci-strbuf-addf-to-addstr later to maint).
370 (merge 2e22a85e5c nd/ignore-glob-doc-update later to maint).
371 (merge 3738031581 jk/gettext-poison later to maint).
372 (merge 54360a1956 rj/sparse-updates later to maint).
373 (merge 12e31a6b12 sg/doc-test-must-fail-args later to maint).
374 (merge 760f1ad101 bc/doc-interpret-trailers-grammofix later to maint).
375 (merge 4ccf461f56 bp/fsmonitor later to maint).
376 (merge a6119f82b1 jk/test-hashmap-updates later to maint).
377 (merge 5aea9fe6cc rd/typofix later to maint).
378 (merge e4e5da2796 sb/status-doc-fix later to maint).
379 (merge 7976e901c8 gs/test-unset-xdg-cache-home later to maint).
380 (merge d023df1ee6 tg/worktree-create-tracking later to maint).
381 (merge 4cbe92fd41 sm/mv-dry-run-update later to maint).
382 (merge 75e5e9c3f7 sb/color-h-cleanup later to maint).
383 (merge 2708ef4af6 sg/t6300-modernize later to maint).
384 (merge d88e92d4e0 bw/doc-submodule-recurse-config-with-clone later to maint).
385 (merge f74bbc8dd2 jk/cached-commit-buffer later to maint).
386 (merge 1316416903 ms/non-ascii-ticks later to maint).
387 (merge 878056005e rs/strbuf-read-file-or-whine later to maint).
388 (merge 79f0ba1547 jk/strbuf-read-file-close-error later to maint).
389 (merge edfb8ba068 ot/ref-filter-cleanup later to maint).
390 (merge 11395a3b4b jc/test-must-be-empty later to maint).
391 (merge 768b9d6db7 mk/doc-pretty-fill later to maint).
392 (merge 2caa7b8d27 ab/man-sec-list later to maint).
393 (merge 40c17eb184 ks/t3200-typofix later to maint).
394 (merge bd9958c358 dp/merge-strategy-doc-fix later to maint).
395 (merge 9ee0540a40 js/ming-strftime later to maint).
396 (merge 1775e990f7 tz/complete-tag-delete-tagname later to maint).
397 (merge 00a4b03501 rj/warning-uninitialized-fix later to maint).
398 (merge b635ed97a0 jk/attributes-path-doc later to maint).