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1Git v2.40 Release Notes
2=======================
3
4UI, Workflows & Features
5
6 * "merge-tree" learns a new `--merge-base` option.
7
8 * "git jump" (in contrib/) learned to present the "quickfix list" to
9 its standard output (instead of letting it consumed by the editor
10 it invokes), and learned to also drive emacs/emacsclient.
11
12 * "git var UNKNOWN_VARIABLE" and "git var VARIABLE" with the variable
13 given an empty value used to behave identically. Now the latter
14 just gives an empty output, while the former still gives an error
15 message.
16
17 * Introduce a case insensitive mode to the Bash completion helpers.
18
19 * The advice message given by "git status" when it takes long time to
20 enumerate untracked paths has been updated.
21
22 * Just like "git var GIT_EDITOR" abstracts the complex logic to
23 choose which editor gets used behind it, "git var" now give support
24 to GIT_SEQUENCE_EDITOR.
25
26 * "git format-patch" learned to honor format.mboxrd even when sending
27 patches to the standard output stream,
28
29 * 'cat-file' gains mailmap support for its '--batch-check' and '-s'
30 options.
31
32 * Conditionally skip the pre-applypatch and applypatch-msg hooks when
33 applying patches with 'git am'.
34
35 * Introduce an optional configuration to allow the trailing hash that
36 protects the index file from bit flipping.
37
38 * "git check-attr" learned to take an optional tree-ish to read the
39 .gitattributes file from.
40
41 * "scalar" learned to give progress bar.
42
43 * "grep -P" learned to use Unicode Character Property to grok
44 character classes when processing \b and \w etc.
45
46 * "git rebase" often ignored incompatible options instead of
47 complaining, which has been corrected.
48
49 * "scalar" warns but continues when its periodic maintenance
50 feature cannot be enabled.
51
52 * The bundle-URI subsystem adds support for creation-token heuristics
53 to help incremental fetches.
54
55 * Userdiff regexp update for Java language.
56
57 * "git fetch --jobs=0" used to hit a BUG(), which has been corrected
58 to use the available CPUs.
59
60 * An invalid label or ref in the "rebase -i" todo file used to
61 trigger an runtime error. SUch an error is now diagnosed while the
62 todo file is parsed.
63
64 * The "diff" drivers specified by the "diff" attribute attached to
65 paths can now specify which algorithm (e.g. histogram) to use.
66
67 * "git range-diff" learned --abbrev=<num> option.
68
69 * "git archive HEAD^{tree}" records the paths with the current
70 timestamp in the archive, making it harder to obtain a stable
71 output. The command learned the --mtime option to specify an
72 arbitrary timestamp (e.g. --mtime="@0 +0000" for the epoch).
73
74 * The credential subsystem learned that a password may have an
75 explicit expiration.
76
77 * The format.attach configuration variable lacked a way to override a
78 value defined in a lower-priority configuration file (e.g. the
79 system one) by redefining it in a higher-priority configuration
80 file. Now, setting format.attach to an empty string means show the
81 patch inline in the e-mail message, without using MIME attachment.
82
83 This is a backward incompatible change.
84
85
86Performance, Internal Implementation, Development Support etc.
87
88 * `git bisect` becomes a builtin.
89
90 * The pack-bitmap machinery is taught to log the paths of redundant
91 bitmap(s) to trace2 instead of stderr.
92
93 * Use the SHA1DC implementation on macOS, just like other platforms,
94 by default.
95
96 * Even in a repository with promisor remote, it is useless to
97 attempt to lazily attempt fetching an object that is expected to be
98 commit, because no "filter" mode omits commit objects. Take
99 advantage of this assumption to fail fast on errors.
100
101 * Stop using "git --super-prefix" and narrow the scope of its use to
102 the submodule--helper.
103
104 * Stop running win+VS build by default.
105
106 * CI updates. We probably want a clean-up to move the long shell
107 script embedded in yaml file into a separate file, but that can
108 come later.
109
110 * Use `git diff --no-index` as a test_cmp on Windows.
111
112 We'd probably need to revisit "do we really want to, and have to,
113 lose CRLF vs LF?" later, at which time we may be able to further
114 clean this up by replacing "git diff --no-index" with "diff -u".
115
116 * Avoid unnecessary builds in CI, with settings configured in
117 ci-config.
118
119 * Plug leaks in sequencer subsystem and its users.
120
121 * In-tree .gitattributes update to match the way we recommend our
122 users to mark a file as text.
123 (merge 1f34e0cd3d po/attributes-text later to maint).
124
125 * Finally retire the scripted "git add -p/-i" implementation and have
126 everybody use the one reimplemented in C.
127
128
129Fixes since v2.39
130-----------------
131
132 * Various leak fixes.
133
134 * Fix a bug where `pack-objects` would not respect multiple `--filter`
135 arguments when invoked directly.
136 (merge d4f7036887 rs/multi-filter-args later to maint).
137
138 * Make fsmonitor more robust to avoid the flakiness seen in t7527.
139 (merge 6692d45477 jh/t7527-unflake-by-forcing-cookie later to maint).
140
141 * Stop using deprecated macOS API in fsmonitor.
142 (merge b0226007f0 jh/fsmonitor-darwin-modernize later to maint).
143
144 * Redefining system functions for a few functions did not follow our
145 usual "implement git_foo() and #define foo(args) git_foo(args)"
146 pattern, which has broken build for some folks.
147
148 * The way the diff machinery prepares the options array for the
149 parse_options API has been refactored to avoid resource leaks.
150 (merge 189e97bc4b rs/diff-parseopts later to maint).
151
152 * Correct pthread API usage.
153 (merge 786e67611d sx/pthread-error-check-fix later to maint).
154
155 * The code to auto-correct a misspelt subcommand unnecessarily called
156 into git_default_config() from the early config codepath, which was
157 a no-no. This has bee corrected.
158 (merge 0918d08887 sg/help-autocorrect-config-fix later to maint).
159
160 * "git http-fetch" (which is rarely used) forgot to identify itself
161 in the trace2 output.
162 (merge 7abb43cbc8 jt/http-fetch-trace2-report-name later to maint).
163
164 * The output from "git diff --stat" on an unmerged path lost the
165 terminating LF in Git 2.39, which has been corrected.
166 (merge 209d9cb011 pg/diff-stat-unmerged-regression-fix later to maint).
167
168 * "git pull -v --recurse-submodules" attempted to pass "-v" down to
169 underlying "git submodule update", which did not understand the
170 request and barfed, which has been corrected.
171 (merge 6f65f84766 ss/pull-v-recurse-fix later to maint).
172
173 * When given a pattern that matches an empty string at the end of a
174 line, the code to parse the "git diff" line-ranges fell into an
175 infinite loop, which has been corrected.
176
177 * Fix the sequence to fsync $GIT_DIR/packed-refs file that forgot to
178 flush its output to the disk..
179
180 * Fix to a small regression in 2.38 days.
181
182 * "git diff --relative" did not mix well with "git diff --ext-diff",
183 which has been corrected.
184
185 * The logic to see if we are using the "cone" mode by checking the
186 sparsity patterns has been tightened to avoid mistaking a pattern
187 that names a single file as specifying a cone.
188
189 * Deal with a few deprecation warning from cURL library.
190
191 * Doc update for environment variables set when hooks are invoked.
192
193 * Document ORIG_HEAD a bit more.
194
195 * "git ls-tree --format='%(path) %(path)' $tree $path" showed the
196 path three times, which has been corrected.
197
198 * Remove "git env--helper" and demote it to a test-tool subcommand.
199 (merge 4a1baacd46 ab/test-env-helper later to maint).
200
201 * Newer regex library macOS stopped enabling GNU-like enhanced BRE,
202 where '\(A\|B\)' works as alternation, unless explicitly asked with
203 the REG_ENHANCED flag. "git grep" now can be compiled to do so, to
204 retain the old behaviour.
205
206 * Pthread emulation on Win32 leaked thread handle when a thread is
207 joined.
208 (merge 238a9dfe86 sk/win32-close-handle-upon-pthread-join later to maint).
209
210 * "git send-email -v 3" used to be expanded to "git send-email
211 --validate 3" when the user meant to pass them down to
212 "format-patch", which has been corrected.
213 (merge 8774aa56ad km/send-email-with-v-reroll-count later to maint).
214
215 * Document that "branch -f <branch>" disables only the safety to
216 avoid recreating an existing branch.
217
218 * "git fetch <group>", when "<group>" of remotes lists the same
219 remote twice, unnecessarily failed when parallel fetching was
220 enabled, which has been corrected.
221 (merge 06a668cb90 cw/fetch-remote-group-with-duplication later to maint).
222
223 * Clarify how "checkout -b/-B" and "git branch [-f]" are similar but
224 different in the documentation.
225
226 * "git hash-object" now checks that the resulting object is well
227 formed with the same code as "git fsck".
228 (merge 8e4309038f jk/hash-object-fsck later to maint).
229
230 * Improve the error message given when private key is not loaded in
231 the ssh agent in the codepath to sign with an ssh key.
232 (merge dce7b31126 as/ssh-signing-improve-key-missing-error later to maint).
233
234 * Adjust "git request-pull" to strip embedded signature from signed
235 tags to notice non-PGP signatures.
236 (merge a9cad02538 gm/request-pull-with-non-pgp-signed-tags later to maint).
237
238 * Remove support for MSys, which now lags way behind MSys2.
239 (merge 2987407f3c hj/remove-msys-support later to maint).
240
241 * Fix use of CreateThread() API call made early in the windows
242 start-up code.
243 (merge 592bcab61b sk/winansi-createthread-fix later to maint).
244
245 * "git pack-objects" learned to release delta-island bitmap data when
246 it is done using it, saving peak heap memory usage.
247 (merge 647982bb71 ew/free-island-marks later to maint).
248
249 * In an environment where dynamically generated code is prohibited to
250 run (e.g. SELinux), failure to JIT pcre patterns is expected. Fall
251 back to interpreted execution in such a case.
252 (merge 50b6ad55b0 cb/grep-fallback-failing-jit later to maint).
253
254 * "git name-rev" heuristics update.
255 (merge b2182a8730 en/name-rev-make-taggerdate-much-less-important later to maint).
256
257 * Remove more remaining uses of macros that relies on the_index
258 singleton instance without explicitly spelling it out.
259
260 * Remove unnecessary explicit sizing of strbuf.
261 (merge 93ea118bed rs/cache-tree-strbuf-growth-fix later to maint).
262
263 * Doc update.
264 (merge d9ec3b0dc0 jk/doc-ls-remote-matching later to maint).
265
266 * Error messages given upon a signature verification failure used to
267 discard the errors from underlying gpg program, which has been
268 corrected.
269 (merge ad6b320756 js/gpg-errors later to maint).
270
271 * Update --date=default documentation.
272 (merge 9deef088ae rd/doc-default-date-format later to maint).
273
274 * A test helper had a single write(2) of 256kB, which was too big for
275 some platforms (e.g. NonStop), which has been corrected by using
276 xwrite() wrapper appropriately.
277 (merge 58eab6ff13 jc/genzeros-avoid-raw-write later to maint).
278
279 * sscanf(3) used in "git symbolic-ref --short" implementation found
280 to be not working reliably on macOS in UTF-8 locales. Rewrite the
281 code to avoid sscanf() altogether to work it around.
282 (merge 613bef56b8 jk/shorten-unambiguous-ref-wo-sscanf later to maint).
283
284 * Various fix-ups on HTTP tests.
285 (merge 8f2146dbf1 jk/http-test-fixes later to maint).
286
287 * Fixes to code that parses the todo file used in "rebase -i".
288 (merge 666b6e1135 pw/rebase-i-parse-fix later to maint).
289
290 * Test library clean-up.
291 (merge c600a91c94 ar/test-lib-remove-stale-comment later to maint).
292
293 * Other code cleanup, docfix, build fix, etc.
294 (merge 4eb1ccecd4 dh/mingw-ownership-check-typofix later to maint).
295 (merge f95526419b ar/typofix-gitattributes-doc later to maint).
296 (merge 27875aeec9 km/doc-branch-start-point later to maint).
297 (merge 35c194dc57 es/t1509-root-fixes later to maint).
298 (merge 7b341645e3 pw/ci-print-failure-name-fix later to maint).
299 (merge bcb71d45bf jx/t1301-updates later to maint).
300 (merge ebdc46c242 jc/doc-diff-patch.txt later to maint).
301 (merge a87a20cbb4 ar/test-cleanup later to maint).
302 (merge f5156f1885 ar/bisect-doc-update later to maint).
303 (merge fca2d86c97 jk/interop-error later to maint).
304 (merge cf4936ed74 tl/ls-tree-code-clean-up later to maint).
305 (merge dcb47e52b0 en/t6426-todo-cleanup later to maint).
306 (merge 5b8db44bdd jc/format-patch-v-unleak later to maint).
307 (merge 590b636737 jk/hash-object-literally-fd-leak later to maint).
308 (merge 5458ba0a4d tb/t0003-invoke-dd-more-portably later to maint).
309 (merge 70661d288b ar/markup-em-dash later to maint).
310 (merge e750951e74 en/ls-files-doc-update later to maint).
311 (merge 4f542975d1 mh/doc-credential-cache-only-in-core later to maint).
312 (merge 3a2ebaebc7 gc/index-format-doc later to maint).
313 (merge b08edf709d jk/httpd-test-updates later to maint).
314 (merge d85e9448dd wl/new-command-doc later to maint).
315 (merge d912a603ed kf/t5000-modernise later to maint).
316 (merge e65b868d07 rs/size-t-fixes later to maint).
317 (merge 3eb1e1ca9a ab/config-h-remove-unused later to maint).
318 (merge d390e08076 cw/doc-pushurl-vs-url later to maint).
319 (merge 567342fc77 rs/ctype-test later to maint).
320 (merge d35d8f2e7a ap/t2015-style-update later to maint).