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diff --git a/Documentation/RelNotes/2.8.0.txt b/Documentation/RelNotes/2.8.0.txt new file mode 100644 index 0000000000..2f6b4948e5 --- /dev/null +++ b/Documentation/RelNotes/2.8.0.txt @@ -0,0 +1,444 @@ +Git 2.8 Release Notes +===================== + +Backward compatibility note +--------------------------- + +The rsync:// transport has been removed. + + +Updates since v2.7 +------------------ + +UI, Workflows & Features + + * It turns out "git clone" over rsync transport has been broken when + the source repository has packed references for a long time, and + nobody noticed nor complained about it. + + * "push" learned that its "--delete" option can be shortened to + "-d", just like "branch --delete" and "branch -d" are the same + thing. + + * "git blame" learned to produce the progress eye-candy when it takes + too much time before emitting the first line of the result. + + * "git grep" can now be configured (or told from the command line) + how many threads to use when searching in the working tree files. + + * Some "git notes" operations, e.g. "git log --notes=<note>", should + be able to read notes from any tree-ish that is shaped like a notes + tree, but the notes infrastructure required that the argument must + be a ref under refs/notes/. Loosen it to require a valid ref only + when the operation would update the notes (in which case we must + have a place to store the updated notes tree, iow, a ref). + + * "git grep" by default does not fall back to its "--no-index" + behaviour outside a directory under Git's control (otherwise the + user may by mistake end up running a huge recursive search); with a + new configuration (set in $HOME/.gitconfig--by definition this + cannot be set in the config file per project), this safety can be + disabled. + + * "git pull --rebase" has been extended to allow invoking + "rebase -i". + + * "git p4" learned to cope with the type of a file getting changed. + + * "git format-patch" learned to notice format.outputDirectory + configuration variable. This allows "-o <dir>" option to be + omitted on the command line if you always use the same directory in + your workflow. + + * "interpret-trailers" has been taught to optionally update a file in + place, instead of always writing the result to the standard output. + + * Many commands that read files that are expected to contain text + that is generated (or can be edited) by the end user to control + their behaviour (e.g. "git grep -f <filename>") have been updated + to be more tolerant to lines that are terminated with CRLF (they + used to treat such a line to contain payload that ends with CR, + which is usually not what the users expect). + + * "git notes merge" used to limit the source of the merged notes tree + to somewhere under refs/notes/ hierarchy, which was too limiting + when inventing a workflow to exchange notes with remote + repositories using remote-tracking notes trees (located in e.g. + refs/remote-notes/ or somesuch). + + * "git ls-files" learned a new "--eol" option to help diagnose + end-of-line problems. + + * "ls-remote" learned an option to show which branch the remote + repository advertises as its primary by pointing its HEAD at. + + * New http.proxyAuthMethod configuration variable can be used to + specify what authentication method to use, as a way to work around + proxies that do not give error response expected by libcurl when + CURLAUTH_ANY is used. Also, the codepath for proxy authentication + has been taught to use credential API to store the authentication + material in user's keyrings. + + * Update the untracked cache subsystem and change its primary UI from + "git update-index" to "git config". + + * There were a few "now I am doing this thing" progress messages in + the TCP connection code that can be triggered by setting a verbose + option internally in the code, but "git fetch -v" and friends never + passed the verbose option down to that codepath. + + * Clean/smudge filters defined in a configuration file of lower + precedence can now be overridden to be a pass-through no-op by + setting the variable to an empty string. + + * A new "<branch>^{/!-<pattern>}" notation can be used to name a + commit that is reachable from <branch> that does not match the + given <pattern>. + + * The "user.useConfigOnly" configuration variable can be used to + force the user to always set user.email & user.name configuration + variables, serving as a reminder for those who work on multiple + projects and do not want to put these in their $HOME/.gitconfig. + + * "git fetch" and friends that make network connections can now be + told to only use ipv4 (or ipv6). + + * Some authentication methods do not need username or password, but + libcurl needs some hint that it needs to perform authentication. + Supplying an empty username and password string is a valid way to + do so, but you can set the http.[<url>.]emptyAuth configuration + variable to achieve the same, if you find it cleaner. + + * You can now set http.[<url>.]pinnedpubkey to specify the pinned + public key when building with recent enough versions of libcURL. + + * The configuration system has been taught to phrase where it found a + bad configuration variable in a better way in its error messages. + "git config" learnt a new "--show-origin" option to indicate where + the values come from. + + * The "credential-cache" daemon process used to run in whatever + directory it happened to start in, but this made umount(2)ing the + filesystem that houses the repository harder; now the process + chdir()s to the directory that house its own socket on startup. + + * When "git submodule update" did not result in fetching the commit + object in the submodule that is referenced by the superproject, the + command learned to retry another fetch, specifically asking for + that commit that may not be connected to the refs it usually + fetches. + + * "git merge-recursive" learned "--no-renames" option to disable its + rename detection logic. + + * Across the transition at around Git version 2.0, the user used to + get a pretty loud warning when running "git push" without setting + push.default configuration variable. We no longer warn because the + transition was completed a long time ago. + + * README has been renamed to README.md and its contents got tweaked + slightly to make it easier on the eyes. + + +Performance, Internal Implementation, Development Support etc. + + * Add a framework to spawn a group of processes in parallel, and use + it to run "git fetch --recurse-submodules" in parallel. + + * A slight update to the Makefile to mark ".PHONY" targets as such + correctly. + + * In-core storage of the reverse index for .pack files (which lets + you go from a pack offset to an object name) has been streamlined. + + * d95138e6 (setup: set env $GIT_WORK_TREE when work tree is set, like + $GIT_DIR, 2015-06-26) attempted to work around a glitch in alias + handling by overwriting GIT_WORK_TREE environment variable to + affect subprocesses when set_git_work_tree() gets called, which + resulted in a rather unpleasant regression to "clone" and "init". + Try to address the same issue by always restoring the environment + and respawning the real underlying command when handling alias. + + * The low-level code that is used to create symbolic references has + been updated to share more code with the code that deals with + normal references. + + * strbuf_getline() and friends have been redefined to make it easier + to identify which callsite of (new) strbuf_getline_lf() should + allow and silently ignore carriage-return at the end of the line to + help users on DOSsy systems. + + * "git shortlog" used to accumulate various pieces of information + regardless of what was asked to be shown in the final output. It + has been optimized by noticing what need not to be collected + (e.g. there is no need to collect the log messages when showing + only the number of changes). + + * "git checkout $branch" (and other operations that share the same + underlying machinery) has been optimized. + + * Automated tests in Travis CI environment has been optimized by + persisting runtime statistics of previous "prove" run, executing + tests that take longer before other ones; this reduces the total + wallclock time. + + * Test scripts have been updated to remove assumptions that are not + portable between Git for POSIX and Git for Windows, or to skip ones + with expectations that are not satisfiable on Git for Windows. + + * Some calls to strcpy(3) triggers a false warning from static + analysers that are less intelligent than humans, and reducing the + number of these false hits helps us notice real issues. A few + calls to strcpy(3) in a couple of protrams that are already safe + has been rewritten to avoid false warnings. + + * The "name_path" API was an attempt to reduce the need to construct + the full path out of a series of path components while walking a + tree hierarchy, but over time made less efficient because the path + needs to be flattened, e.g. to be compared with another path that + is already flat. The API has been removed and its users have been + rewritten to simplify the overall code complexity. + + * Help those who debug http(s) part of the system. + (merge 0054045 sp/remote-curl-ssl-strerror later to maint). + + * The internal API to interact with "remote.*" configuration + variables has been streamlined. + + * The ref-filter's format-parsing code has been refactored, in + preparation for "branch --format" and friends. + + * Traditionally, the tests that try commands that work on the + contents in the working tree were named with "worktree" in their + filenames, but with the recent addition of "git worktree" + subcommand, whose tests are also named similarly, it has become + harder to tell them apart. The traditional tests have been renamed + to use "work-tree" instead in an attempt to differentiate them. + (merge 5549029 mg/work-tree-tests later to maint). + + * Many codepaths forget to check return value from git_config_set(); + the function is made to die() to make sure we do not proceed when + setting a configuration variable failed. + (merge 3d18064 ps/config-error later to maint). + + * Handling of errors while writing into our internal asynchronous + process has been made more robust, which reduces flakiness in our + tests. + (merge 43f3afc jk/epipe-in-async later to maint). + + * There is a new DEVELOPER knob that enables many compiler warning + options in the Makefile. + + * The way the test scripts configure the Apache web server has been + updated to work also for Apache 2.4 running on RedHat derived + distros. + + * Out of maintenance gcc on OSX 10.6 fails to compile the code in + 'master'; work it around by using clang by default on the platform. + + * The "name_path" API was an attempt to reduce the need to construct + the full path out of a series of path components while walking a + tree hierarchy, but over time made less efficient because the path + needs to be flattened, e.g. to be compared with another path that + is already flat, in many cases. The API has been removed and its + users have been rewritten to simplify the overall code complexity. + This incidentally also closes some heap-corruption holes. + + * Recent versions of GNU grep is pickier than before to decide if a + file is "binary" and refuse to give line-oriented hits when we + expect it to, unless explicitly told with "-a" option. As our + scripted Porcelains use sane_grep wrapper for line-oriented data, + even when the line may contain non-ASCII payload we took from + end-user data, use "grep -a" to implement sane_grep wrapper when + using an implementation of "grep" that takes the "-a" option. + + + +Also contains various documentation updates and code clean-ups. + + +Fixes since v2.7 +---------------- + +Unless otherwise noted, all the fixes since v2.7 in the maintenance +track are contained in this release (see the maintenance releases' +notes for details). + + * An earlier change in 2.5.x-era broke users' hooks and aliases by + exporting GIT_WORK_TREE to point at the root of the working tree, + interfering when they tried to use a different working tree without + setting GIT_WORK_TREE environment themselves. + + * The "exclude_list" structure has the usual "alloc, nr" pair of + fields to be used by ALLOC_GROW(), but clear_exclude_list() forgot + to reset 'alloc' to 0 when it cleared 'nr' to discard the managed + array. + + * Paths that have been told the index about with "add -N" are not + quite yet in the index, but a few commands behaved as if they + already are in a harmful way. + + * "git send-email" was confused by escaped quotes stored in the alias + files saved by "mutt", which has been corrected. + + * A few unportable C construct have been spotted by clang compiler + and have been fixed. + + * The documentation has been updated to hint the connection between + the '--signoff' option and DCO. + + * "git reflog" incorrectly assumed that all objects that used to be + at the tip of a ref must be commits, which caused it to segfault. + + * The ignore mechanism saw a few regressions around untracked file + listing and sparse checkout selection areas in 2.7.0; the change + that is responsible for the regression has been reverted. + + * Another try to improve the ignore mechanism that lets you say "this + is excluded" and then later say "oh, no, this part (that is a + subset of the previous part) is not excluded". This has still a + known limitation, though. + + * Some codepaths used fopen(3) when opening a fixed path in $GIT_DIR + (e.g. COMMIT_EDITMSG) that is meant to be left after the command is + done. This however did not work well if the repository is set to + be shared with core.sharedRepository and the umask of the previous + user is tighter. They have been made to work better by calling + unlink(2) and retrying after fopen(3) fails with EPERM. + + * Asking gitweb for a nonexistent commit left a warning in the server + log. + + Somebody may want to follow this up with an additional test, perhaps? + IIRC, we do test that no Perl warnings are given to the server log, + so this should have been caught if our test coverage were good. + + * "git rebase", unlike all other callers of "gc --auto", did not + ignore the exit code from "gc --auto". + + * Many codepaths that run "gc --auto" before exiting kept packfiles + mapped and left the file descriptors to them open, which was not + friendly to systems that cannot remove files that are open. They + now close the packs before doing so. + + * A recent optimization to filter-branch in v2.7.0 introduced a + regression when --prune-empty filter is used, which has been + corrected. + + * The description for SANITY prerequisite the test suite uses has + been clarified both in the comment and in the implementation. + + * "git tag" started listing a tag "foo" as "tags/foo" when a branch + named "foo" exists in the same repository; remove this unnecessary + disambiguation, which is a regression introduced in v2.7.0. + + * The way "git svn" uses auth parameter was broken by Subversion + 1.9.0 and later. + + * The "split" subcommand of "git subtree" (in contrib/) incorrectly + skipped merges when it shouldn't, which was corrected. + + * A few options of "git diff" did not work well when the command was + run from a subdirectory. + + * The command line completion learned a handful of additional options + and command specific syntax. + + * dirname() emulation has been added, as Msys2 lacks it. + + * The underlying machinery used by "ls-files -o" and other commands + has been taught not to create empty submodule ref cache for a + directory that is not a submodule. This removes a ton of wasted + CPU cycles. + + * "git worktree" had a broken code that attempted to auto-fix + possible inconsistency that results from end-users moving a + worktree to different places without telling Git (the original + repository needs to maintain backpointers to its worktrees, but + "mv" run by end-users who are not familiar with that fact will + obviously not adjust them), which actually made things worse + when triggered. + + * The low-level merge machinery has been taught to use CRLF line + termination when inserting conflict markers to merged contents that + are themselves CRLF line-terminated. + + * "git push --force-with-lease" has been taught to report if the push + needed to force (or fast-forwarded). + + * The emulated "yes" command used in our test scripts has been + tweaked not to spend too much time generating unnecessary output + that is not used, to help those who test on Windows where it would + not stop until it fills the pipe buffer due to lack of SIGPIPE. + + * The documentation for "git clean" has been corrected; it mentioned + that .git/modules/* are removed by giving two "-f", which has never + been the case. + + * The vimdiff backend for "git mergetool" has been tweaked to arrange + and number buffers in the order that would match the expectation of + majority of people who read left to right, then top down and assign + buffers 1 2 3 4 "mentally" to local base remote merge windows based + on that order. + + * "git show 'HEAD:Foo[BAR]Baz'" did not interpret the argument as a + rev, i.e. the object named by the the pathname with wildcard + characters in a tree object. + (merge aac4fac nd/dwim-wildcards-as-pathspecs later to maint). + + * "git rev-parse --git-common-dir" used in the worktree feature + misbehaved when run from a subdirectory. + (merge 17f1365 nd/git-common-dir-fix later to maint). + + * "git worktree add -B <branchname>" did not work. + + * The "v(iew)" subcommand of the interactive "git am -i" command was + broken in 2.6.0 timeframe when the command was rewritten in C. + (merge 708b8cc jc/am-i-v-fix later to maint). + + * "git merge-tree" used to mishandle "both sides added" conflict with + its own "create a fake ancestor file that has the common parts of + what both sides have added and do a 3-way merge" logic; this has + been updated to use the usual "3-way merge with an empty blob as + the fake common ancestor file" approach used in the rest of the + system. + (merge 907681e jk/no-diff-emit-common later to maint). + + * The memory ownership rule of fill_textconv() API, which was a bit + tricky, has been documented a bit better. + (merge a64e6a4 jk/more-comments-on-textconv later to maint). + + * Update various codepaths to avoid manually-counted malloc(). + (merge 08c95df jk/tighten-alloc later to maint). + + * The documentation did not clearly state that the 'simple' mode is + now the default for "git push" when push.default configuration is + not set. + (merge f6b1fb3 mm/push-simple-doc later to maint). + + * Recent versions of GNU grep are pickier when their input contains + arbitrary binary data, which some of our tests uses. Rewrite the + tests to sidestep the problem. + (merge 3b1442d jk/grep-binary-workaround-in-test later to maint). + + * A helper function "git submodule" uses since v2.7.0 to list the + modules that match the pathspec argument given to its subcommands + (e.g. "submodule add <repo> <path>") has been fixed. + (merge 2b56bb7 sb/submodule-module-list-fix later to maint). + + * "git config section.var value" to set a value in per-repository + configuration file failed when it was run outside any repository, + but didn't say the reason correctly. + (merge 638fa62 js/config-set-in-non-repository later to maint). + + * The code to read the pack data using the offsets stored in the pack + idx file has been made more carefully check the validity of the + data in the idx. + (merge 7465feb jk/pack-idx-corruption-safety later to maint). + + * Other minor clean-ups and documentation updates + (merge f459823 ak/extract-argv0-last-dir-sep later to maint). + (merge 63ca1c0 ak/git-strip-extension-from-dashed-command later to maint). + (merge 4867f11 ps/plug-xdl-merge-leak later to maint). + (merge 4938686 dt/initial-ref-xn-commit-doc later to maint). + (merge 9537f21 ma/update-hooks-sample-typofix later to maint). |