4 Backward compatibility notes
5 ----------------------------
7 The end-user facing Porcelain level commands in the "git diff" and
8 "git log" family by default enable the rename detection; you can still
9 use "diff.renames" configuration variable to disable this.
11 Merging two branches that have no common ancestor with "git merge" is
12 by default forbidden now to prevent creating such an unusual merge by
15 The output formats of "git log" that indents the commit log message by
16 4 spaces now expands HT in the log message by default. You can use
17 the "--no-expand-tabs" option to disable this.
19 "git commit-tree" plumbing command required the user to always sign
20 its result when the user sets the commit.gpgsign configuration
21 variable, which was an ancient mistake, which this release corrects.
22 A script that drives commit-tree, if it relies on this mistake, now
23 needs to read commit.gpgsign and pass the -S option as necessary.
29 UI, Workflows & Features
31 * Comes with git-multimail 1.3.1 (in contrib/).
33 * The end-user facing commands like "git diff" and "git log"
34 now enable the rename detection by default.
36 * The credential.helper configuration variable is cumulative and
37 there is no good way to override it from the command line. As
38 a special case, giving an empty string as its value now serves
39 as the signal to clear the values specified in various files.
41 * A new "interactive.diffFilter" configuration can be used to
42 customize the diff shown in "git add -i" sessions.
44 * "git p4" now allows P4 author names to be mapped to Git author
47 * "git rebase -x" can be used without passing "-i" option.
49 * "git -c credential.<var>=<value> submodule" can now be used to
50 propagate configuration variables related to credential helper
51 down to the submodules.
53 * "git tag" can create an annotated tag without explicitly given an
54 "-a" (or "-s") option (i.e. when a tag message is given). A new
55 configuration variable, tag.forceSignAnnotated, can be used to tell
56 the command to create signed tag in such a situation.
58 * "git merge" used to allow merging two branches that have no common
59 base by default, which led to a brand new history of an existing
60 project created and then get pulled by an unsuspecting maintainer,
61 which allowed an unnecessary parallel history merged into the
62 existing project. The command has been taught not to allow this by
63 default, with an escape hatch "--allow-unrelated-histories" option
64 to be used in a rare event that merges histories of two projects
65 that started their lives independently.
67 * "git pull" has been taught to pass the "--allow-unrelated-histories"
68 option to underlying "git merge".
70 * "git apply -v" learned to report paths in the patch that were
71 skipped via --include/--exclude mechanism or being outside the
72 current working directory.
74 * Shell completion (in contrib/) updates.
76 * The commit object name reported when "rebase -i" stops has been
79 * "git worktree add" can be given "--no-checkout" option to only
80 create an empty worktree without checking out the files.
82 * "git mergetools" learned to drive ExamDiff.
84 * "git pull --rebase" learned "--[no-]autostash" option, so that
85 the rebase.autostash configuration variable set to true can be
86 overridden from the command line.
88 * When "git log" shows the log message indented by 4-spaces, the
89 remainder of a line after a HT does not align in the way the author
90 originally intended. The command now expands tabs by default to help
91 such a case, and allows the users to override it with a new option,
94 * "git send-email" now uses a more readable timestamps when
95 formulating a message ID.
97 * "git rerere" can encounter two or more files with the same conflict
98 signature that have to be resolved in different ways, but there was
99 no way to record these separate resolutions.
101 * "git p4" learned to record P4 jobs in Git commit that imports from
102 the history in Perforce.
104 * "git describe --contains" often made a hard-to-justify choice of
105 tag to name a given commit, because it tried to come up
106 with a name with smallest number of hops from a tag, causing an old
107 commit whose close descendant that is recently tagged were not
108 described with respect to an old tag but with a newer tag. It did
109 not help that its computation of "hop" count was further tweaked to
110 penalize being on a side branch of a merge. The logic has been
111 updated to favor using the tag with the oldest tagger date, which
112 is a lot easier to explain to the end users: "We describe a commit
113 in terms of the (chronologically) oldest tag that contains the
115 (merge 7550424 js/name-rev-use-oldest-ref later to maint).
117 * "git clone" learned the "--shallow-submodules" option.
119 * HTTP transport clients learned to throw extra HTTP headers at the
120 server, specified via http.extraHeader configuration variable.
122 * Patch output from "git diff" and friends has been tweaked to be
123 more readable by using a blank line as a strong hint that the
124 contents before and after it belong to logically separate units.
126 * A new configuration variable core.hooksPath allows customizing
127 where the hook directory is.
129 * An earlier addition of "sanitize_submodule_env" with 14111fc4 (git:
130 submodule honor -c credential.* from command line, 2016-02-29)
131 turned out to be a convoluted no-op; implement what it wanted to do
132 correctly, and stop filtering settings given via "git -c var=val".
134 * "git commit --dry-run" reported "No, no, you cannot commit." in one
135 case where "git commit" would have allowed you to commit, and this
136 improves it a little bit ("git commit --dry-run --short" still does
137 not give you the correct answer, for example). This is a stop-gap
138 measure in that "commit --short --dry-run" still gives an incorrect
141 * The experimental "multiple worktree" feature gains more safety to
142 forbid operations on a branch that is checked out or being actively
143 worked on elsewhere, by noticing that e.g. it is being rebased.
145 * "git format-patch" learned a new "--base" option to record what
146 (public, well-known) commit the original series was built on in
149 * "git commit" learned to pay attention to the "commit.verbose"
150 configuration variable and act as if the "--verbose" option
151 was given from the command line.
153 * Updated documentation gives hints to GMail users with two-factor
154 auth enabled that they need app-specific-password when using
157 * The manpage output of our documentation did not render well in
158 terminal; typeset literals in bold by default to make them stand
161 * The mark-up in the top-level README.md file has been updated to
162 typeset CLI command names differently from the body text.
165 Performance, Internal Implementation, Development Support etc.
167 * The embedded args argv-array in the child process is used to build
168 the command line to run pack-objects instead of using a separate
171 * A test for tags has been restructured so that more parts of it can
172 easily be run on a platform without a working GnuPG.
174 * The startup_info data, which records if we are working inside a
175 repository (among other things), are now uniformly available to Git
176 subcommand implementations, and Git avoids attempting to touch
177 references when we are not in a repository.
179 * The command line argument parser for "receive-pack" has been
180 rewritten to use parse-options.
182 * A major part of "git submodule update" has been ported to C to take
183 advantage of the recently added framework to run download tasks in
184 parallel. Other updates to "git submodule" that move pieces of
185 logic to C continues.
187 * Rename bunch of tests on "git clone" for better organization.
189 * The tests that involve running httpd leaked the system-wide
190 configuration in /etc/gitconfig to the tested environment.
192 * Build updates for MSVC.
194 * The repository set-up sequence has been streamlined (the biggest
195 change is that there is no longer git_config_early()), so that we
196 do not attempt to look into refs/* when we know we do not have a
199 * Code restructuring around the "refs" API to prepare for pluggable
202 * Sources to many test helper binaries and the generated helpers
203 have been moved to t/helper/ subdirectory to reduce clutter at the
204 top level of the tree.
206 * Unify internal logic between "git tag -v" and "git verify-tag"
207 commands by making one directly call into the other.
209 * "merge-recursive" strategy incorrectly checked if a path that is
210 involved in its internal merge exists in the working tree.
212 * The test scripts for "git p4" (but not "git p4" implementation
213 itself) has been updated so that they would work even on a system
214 where the installed version of Python is python 3.
216 * As nobody maintains our in-tree git.spec.in and distros use their
217 own spec file, we stopped pretending that we support "make rpm".
219 * Move from "unsigned char[20]" to "struct object_id" continues.
221 * The code for warning_errno/die_errno has been refactored and a new
222 error_errno() reporting helper is introduced.
223 (merge 1da045f nd/error-errno later to maint).
225 * Running tests with '-x' option to trace the individual command
226 executions is a useful way to debug test scripts, but some tests
227 that capture the standard error stream and check what the command
228 said can be broken with the trace output mixed in. When running
229 our tests under "bash", however, we can redirect the trace output
230 to another file descriptor to keep the standard error of programs
232 (merge d88785e jk/test-send-sh-x-trace-elsewhere later to maint).
234 * t0040 had too many unnecessary repetitions in its test data. Teach
235 test-parse-options program so that a caller can tell what it
236 expects in its output, so that these repetitions can be cleaned up.
238 * Add perf test for "rebase -i".
240 * Common mistakes when writing gitlink: in our documentation are
241 found by "make check-docs".
243 * t9xxx series has been updated primarily for readability, while
244 fixing small bugs in it. A few scripted Porcelain commands have
245 also been updated to fix possible bugs around their use of
246 "test -z" and "test -n".
248 * CI test was taught to run git-svn tests.
250 * "git cat-file --batch-all" has been sped up, by taking advantage
251 of the fact that it does not have to read a list of objects, in two
254 * test updates to make it more readable and maintainable.
255 (merge e6273f4 es/t1500-modernize later to maint).
257 * "make DEVELOPER=1" worked as expected; setting DEVELOPER=1 in
259 (merge 51dd3e8 mm/makefile-developer-can-be-in-config-mak later to maint).
262 Also contains various documentation updates and code clean-ups.
268 Unless otherwise noted, all the fixes since v2.8 in the maintenance
269 track are contained in this release (see the maintenance releases'
272 * "git config --get-urlmatch", unlike other variants of the "git
273 config --get" family, did not signal error with its exit status
274 when there was no matching configuration.
276 * The "--local-env-vars" and "--resolve-git-dir" options of "git
277 rev-parse" failed to work outside a repository when the command's
278 option parsing was rewritten in 1.8.5 era.
280 * "git index-pack --keep[=<msg>] pack-$name.pack" simply did not work.
282 * Fetching of history by naming a commit object name directly didn't
283 work across remote-curl transport.
285 * A small memory leak in an error codepath has been plugged in xdiff
288 * strbuf_getwholeline() did not NUL-terminate the buffer on certain
289 corner cases in its error codepath.
291 * "git mergetool" did not work well with conflicts that both sides
294 * "git send-email" had trouble parsing alias file in mailrc format
295 when lines in it had trailing whitespaces on them.
297 * When "git merge --squash" stopped due to conflict, the concluding
298 "git commit" failed to read in the SQUASH_MSG that shows the log
299 messages from all the squashed commits.
301 * "git merge FETCH_HEAD" dereferenced NULL pointer when merging
302 nothing into an unborn history (which is arguably unusual usage,
303 which perhaps was the reason why nobody noticed it).
305 * When "git worktree" feature is in use, "git branch -d" allowed
306 deletion of a branch that is checked out in another worktree,
309 * When "git worktree" feature is in use, "git branch -m" renamed a
310 branch that is checked out in another worktree without adjusting
311 the HEAD symbolic ref for the worktree.
313 * "git diff -M" used to work better when two originally identical
314 files A and B got renamed to X/A and X/B by pairing A to X/A and B
315 to X/B, but this was broken in the 2.0 timeframe.
317 * "git send-pack --all <there>" was broken when its command line
318 option parsing was written in the 2.6 timeframe.
320 * "git format-patch --help" showed `-s` and `--no-patch` as if these
321 are valid options to the command. We already hide `--patch` option
322 from the documentation, because format-patch is about showing the
323 diff, and the documentation now hides these options as well.
325 * When running "git blame $path" with unnormalized data in the index
326 for the path, the data in the working tree was blamed, even though
327 "git add" would not have changed what is already in the index, due
328 to "safe crlf" that disables the line-end conversion. It has been
331 * A change back in version 2.7 to "git branch" broke display of a
332 symbolic ref in a non-standard place in the refs/ hierarchy (we
333 expect symbolic refs to appear in refs/remotes/*/HEAD to point at
334 the primary branch the remote has, and as .git/HEAD to point at the
335 branch we locally checked out).
337 * A partial rewrite of "git submodule" in the 2.7 timeframe changed
338 the way the gitdir: pointer in the submodules point at the real
339 repository location to use absolute paths by accident. This has
342 * "git commit" misbehaved in a few minor ways when an empty message
343 is given via -m '', all of which has been corrected.
345 * Support for CRAM-MD5 authentication method in "git imap-send" did
348 * Upcoming OpenSSL 1.1.0 will break compilation by updating a few API
349 elements we use in imap-send, which has been adjusted for the change.
351 * The socks5:// proxy support added back in 2.6.4 days was not aware
352 that socks5h:// proxies behave differently from socks5:// proxies.
354 * "git config" had a codepath that tried to pass a NULL to
355 printf("%s"), which nobody seems to have noticed.
357 * On Cygwin, object creation uses the "create a temporary and then
358 rename it to the final name" pattern, not "create a temporary,
359 hardlink it to the final name and then unlink the temporary"
362 This is necessary to use Git on Windows shared directories, and is
363 already enabled for the MinGW and plain Windows builds. It also
364 has been used in Cygwin packaged versions of Git for quite a while.
365 See http://thread.gmane.org/gmane.comp.version-control.git/291853
367 * "merge-octopus" strategy did not ensure that the index is clean
370 * When "git merge" notices that the merge can be resolved purely at
371 the tree level (without having to merge blobs) and the resulting
372 tree happens to already exist in the object store, it forgot to
373 update the index, which left an inconsistent state that would
374 break later operations.
376 * "git submodule" reports the paths of submodules the command
377 recurses into, but these paths were incorrectly reported when
378 the command was not run from the root level of the superproject.
380 * The "user.useConfigOnly" configuration variable makes it an error
381 if users do not explicitly set user.name and user.email. However,
382 its check was not done early enough and allowed another error to
383 trigger, reporting that the default value we guessed from the
384 system setting was unusable. This was a suboptimal end-user
385 experience as we want the users to set user.name/user.email without
386 relying on the auto-detection at all.
388 * "git mv old new" did not adjust the path for a submodule that lives
389 as a subdirectory inside old/ directory correctly.
391 * "git replace -e" did not honour "core.editor" configuration.
393 * "git push" from a corrupt repository that attempts to push a large
394 number of refs deadlocked; the thread to relay rejection notices
395 for these ref updates blocked on writing them to the main thread,
396 after the main thread at the receiving end notices that the push
397 failed and decides not to read these notices and return a failure.
399 * mmap emulation on Windows has been optimized and work better without
400 consuming paging store when not needed.
402 * A question by "git send-email" to ask the identity of the sender
405 * UI consistency improvements for "git mergetool".
407 * "git rebase -m" could be asked to rebase an entire branch starting
408 from the root, but failed by assuming that there always is a parent
409 commit to the first commit on the branch.
411 * Fix a broken "p4 lfs" test.
413 * Recent update to Git LFS broke "git p4" by changing the output from
414 its "lfs pointer" subcommand.
416 * "git fetch" test t5510 was flaky while running a (forced) automagic
419 * Documentation updates to help contributors setting up Travis CI
420 test for their patches.
422 * Some multi-byte encoding can have a backslash byte as a later part
423 of one letter, which would confuse "highlight" filter used in
426 * "git commit-tree" plumbing command required the user to always sign
427 its result when the user sets the commit.gpgsign configuration
428 variable, which was an ancient mistake. Rework "git rebase" that
429 relied on this mistake so that it reads commit.gpgsign and pass (or
430 not pass) the -S option to "git commit-tree" to keep the end-user
431 expectation the same, while teaching "git commit-tree" to ignore
432 the configuration variable. This will stop requiring the users to
433 sign commit objects used internally as an implementation detail of
436 * "http.cookieFile" configuration variable clearly wants a pathname,
437 but we forgot to treat it as such by e.g. applying tilde expansion.
438 (merge e5a39ad bn/http-cookiefile-config later to maint).
440 * Consolidate description of tilde-expansion that is done to
441 configuration variables that take pathname to a single place.
442 (merge dca83ab jc/config-pathname-type later to maint).
444 * Correct faulty recommendation to use "git submodule deinit ." when
445 de-initialising all submodules, which would result in a strange
446 error message in a pathological corner case.
447 (merge f6a5279 sb/submodule-deinit-all later to maint).
449 * Many 'linkgit:<git documentation page>' references were broken,
450 which are all fixed with this.
451 (merge 1cca17d jc/linkgit-fix later to maint).
453 * "git rerere" can get confused by conflict markers deliberately left
454 by the inner merge step, because they are indistinguishable from
455 the real conflict markers left by the outermost merge which are
456 what the end user and "rerere" need to look at. This was fixed by
457 making the conflict markers left by the inner merges a bit longer.
458 (merge 0f9fd5c jc/ll-merge-internal later to maint).
460 * CI test was taught to build documentation pages.
461 (merge b98712b ls/travis-build-doc later to maint).
463 * "git fsck" learned to catch NUL byte in a commit object as
464 potential error and warn.
465 (merge 6d2d780 jc/fsck-nul-in-commit later to maint).
467 * Portability enhancement for "rebase -i" to help platforms whose
468 shell does not like "for i in <empty>" (which is not POSIX-kosher).
469 (merge 8e98b35 jk/rebase-interactive-eval-fix later to maint).
471 * On Windows, .git and optionally any files whose name starts with a
472 dot are now marked as hidden, with a core.hideDotFiles knob to
473 customize this behaviour.
474 (merge ebf31e7 js/windows-dotgit later to maint).
476 * Documentation for "git merge --verify-signatures" has been updated
477 to clarify that the signature of only the commit at the tip is
478 verified. Also the phrasing used for signature and key validity is
479 adjusted to align with that used by OpenPGP.
480 (merge 05a5869 kf/gpg-sig-verification-doc later to maint).
482 * A couple of bugs around core.autocrlf have been fixed.
483 (merge caa47ad tb/core-eol-fix later to maint).
485 * Many commands normalize command line arguments from NFD to NFC
486 variant of UTF-8 on OSX, but commands in the "diff" family did
487 not, causing "git diff $path" to complain that no such path is
488 known to Git. They have been taught to do the normalization.
489 (merge 90a78b8 ar/diff-args-osx-precompose later to maint).
491 * "git difftool" learned to handle unmerged paths correctly in
493 (merge 366f9ce da/difftool later to maint).
495 * The "are we talking with TTY, doing an interactive session?"
496 detection has been updated to work better for "Git for Windows".
497 (merge f7f90e0 kb/msys2-tty later to maint).
499 * We forgot to add "git log --decorate=auto" to documentation when we
500 added the feature back in v2.1.0 timeframe.
501 (merge 462cbb4 rj/log-decorate-auto later to maint).
503 * "git fast-import --export-marks" would overwrite the existing marks
504 file even when it makes a dump from its custom die routine.
505 Prevent it from doing so when we have an import-marks file but
506 haven't finished reading it.
507 (merge f4beed6 fc/fast-import-broken-marks-file later to maint).
509 * "git rebase -i", after it fails to auto-resolve the conflict, had
510 an unnecessary call to "git rerere" from its very early days, which
511 was spotted recently; the call has been removed.
512 (merge 7063693 js/rebase-i-dedup-call-to-rerere later to maint).
514 * Other minor clean-ups and documentation updates
515 (merge 832c0e5 lp/typofixes later to maint).
516 (merge f5ee54a sb/z-is-gnutar-ism later to maint).
517 (merge 2e3926b va/i18n-misc-updates later to maint).
518 (merge f212dcc bn/config-doc-tt-varnames later to maint).
519 (merge f54bea4 nd/remote-plural-ours-plus-theirs later to maint).
520 (merge 2bb0518 ak/t4151-ls-files-could-be-empty later to maint).
521 (merge 4df4313 jc/test-seq later to maint).
522 (merge a75a308 tb/t5601-sed-fix later to maint).
523 (merge 6c1fbe1 va/i18n-remote-comment-to-align later to maint).
524 (merge dee2303 va/mailinfo-doc-typofix later to maint).
525 (merge cd82b7a pa/cherry-pick-doc-typo later to maint).
526 (merge 2bb73ae rs/patch-id-use-skip-prefix later to maint).
527 (merge aa20cbc rs/apply-name-terminate later to maint).
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