Git 2.9 Release Notes ===================== Backward compatibility note --------------------------- The end-user facing Porcelain level commands in the "git diff" and "git log" by default enables the rename detection; you can still use "diff.renames" configuration variable to disable this. Merging two branches that have no common ancestor with "git merge" is by default forbidden now to prevent creating such an unusual merge by mistake. The output formats of "git log" that indents the commit log message by 4 spaces now expands HT in the log message by default. You can use the "--no-expand-tabs" option to disable this. Updates since v2.8 ------------------ UI, Workflows & Features * The end-user facing Porcelain level commands like "diff" and "log" now enables the rename detection by default. * The credential.helper configuration variable is cumulative and there is no good way to override it from the command line. As a special case, giving an empty string as its value now serves as the signal to clear the values specified in various files. * A new "interactive.diffFilter" configuration can be used to customize the diff shown in "git add -i" session. * "git p4" now allows P4 author names to be mapped to Git author names. * "git rebase -x" can be used without passing "-i" option. * "git -c credential.= submodule" can now be used to propagate configuration variables related to credential helper down to the submodules. * "git tag" can create an annotated tag without explicitly given an "-a" (or "-s") option (i.e. when a tag message is given). A new configuration variable, tag.forceSignAnnotated, can be used to tell the command to create signed tag in such a situation. * "git merge" used to allow merging two branches that have no common base by default, which led to a brand new history of an existing project created and then get pulled by an unsuspecting maintainer, which allowed an unnecessary parallel history merged into the existing project. The command has been taught not to allow this by default, with an escape hatch "--allow-unrelated-histories" option to be used in a rare event that merges histories of two projects that started their lives independently. * "git pull" has been taught to pass --allow-unrelated-histories option to underlying "git merge". * "git apply -v" learned to report paths in the patch that were skipped via --include/--exclude mechanism or being outside the current working directory. * Shell completion (in contrib/) updates. * The commit object name reported when "rebase -i" stops has been shortened. * "git worktree add" can be given "--no-checkout" option to only create an empty worktree without checking out the files. * "git mergetools" learned to drive ExamDiff. * "git pull --rebase" learned "--[no-]autostash" option, so that the rebase.autostash configuration variable set to true can be overridden from the command line. * When "git log" shows the log message indented by 4-spaces, the remainder of a line after a HT does not align in the way the author originally intended. The command now expands tabs by default in such a case, and allows the users to override it with a new option, "--no-expand-tabs". * "git send-email" now uses a more readable timestamps when formulating a message ID. * "git rerere" can encounter two or more files with the same conflict signature that have to be resolved in different ways, but there was no way to record these separate resolutions. (merge 890fca8 jc/rerere-multi later to maint). * "git p4" learned to record P4 jobs in Git commit that imports from the history in Perforce. * "git describe --contains" often made a hard-to-justify choice of tag to give name to a given commit, because it tried to come up with a name with smallest number of hops from a tag, causing an old commit whose close descendant that is recently tagged were not described with respect to an old tag but with a newer tag. It did not help that its computation of "hop" count was further tweaked to penalize being on a side branch of a merge. The logic has been updated to favor using the tag with the oldest tagger date, which is a lot easier to explain to the end users: "We describe a commit in terms of the (chronologically) oldest tag that contains the commit." (merge 7550424 js/name-rev-use-oldest-ref later to maint). Performance, Internal Implementation, Development Support etc. * The embedded args argv-array in the child process is used to build the command line to run pack-objects instead of using a separate array of strings. * A test for tags has been restructured so that more parts of it can easily be run on a platform without a working GnuPG. * The startup_info data, which records if we are working inside a repository (among other things), are now uniformly available to Git subcommand implementations, and Git avoids attempting to touch references when we are not in a repository. * The command line argument parser for "receive-pack" has been rewritten to use parse-options. * A major part of "git submodule update" has been ported to C to take advantage of the recently added framework to run download tasks in parallel. * Rename bunch of tests on "git clone" for better organization. * The tests that involve running httpd leaked the system-wide configuration in /etc/gitconfig to the tested environment. * Build updates for MSVC. * The repository set-up sequence has been streamlined (the biggest change is that there is no longer git_config_early()), so that we do not attempt to look into refs/* when we know we do not have a Git repository. * Code restructuring around the "refs" area to prepare for pluggable refs backends. * Sources to many test helper binaries (and the generated helpers) have been moved to t/helper/ subdirectory to reduce clutter at the top level of the tree. Note that this can break your tests if you check out revisions across the merge boundary of this topic, e0b58519 (Merge branch 'nd/test-helpers', 2016-04-29), as bin-wrappers/test-* are not rebuilt to point the underlying executables. For now, "make distclean" is your friend. * Unify internal logic between "git tag -v" and "git verify-tag" commands by making one directly call into the other. (merge bef234b st/verify-tag later to maint). * "merge-recursive" strategy incorrectly checked if a path that is involved in its internal merge exists in the working tree. Also contains various documentation updates and code clean-ups. Fixes since v2.8 ---------------- Unless otherwise noted, all the fixes since v2.8 in the maintenance track are contained in this release (see the maintenance releases' notes for details). * "git config --get-urlmatch", unlike other variants of the "git config --get" family, did not signal error with its exit status when there was no matching configuration. * The "--local-env-vars" and "--resolve-git-dir" options of "git rev-parse" failed to work outside a repository when the command's option parsing was rewritten in 1.8.5 era. * "git index-pack --keep[=] pack-$name.pack" simply did not work. * Fetching of history by naming a commit object name directly didn't work across remote-curl transport. * A small memory leak in an error codepath has been plugged in xdiff code. * strbuf_getwholeline() did not NUL-terminate the buffer on certain corner cases in its error codepath. * "git mergetool" did not work well with conflicts that both sides deleted. * "git send-email" had trouble parsing alias file in mailrc format when lines in it had trailing whitespaces on them. * When "git merge --squash" stopped due to conflict, the concluding "git commit" failed to read in the SQUASH_MSG that shows the log messages from all the squashed commits. * "git merge FETCH_HEAD" dereferenced NULL pointer when merging nothing into an unborn history (which is arguably unusual usage, which perhaps was the reason why nobody noticed it). * When "git worktree" feature is in use, "git branch -d" allowed deletion of a branch that is checked out in another worktree, which was wrong. * When "git worktree" feature is in use, "git branch -m" renamed a branch that is checked out in another worktree without adjusting the HEAD symbolic ref for the worktree. * "git diff -M" used to work better when two originally identical files A and B got renamed to X/A and X/B by pairing A to X/A and B to X/B, but this was broken in the 2.0 timeframe. * "git send-pack --all " was broken when its command line option parsing was written in the 2.6 timeframe. * "git format-patch --help" showed `-s` and `--no-patch` as if these are valid options to the command. We already hide `--patch` option from the documentation, because format-patch is about showing the diff, and the documentation now hides these options as well. * When running "git blame $path" with unnormalized data in the index for the path, the data in the working tree was blamed, even though "git add" would not have changed what is already in the index, due to "safe crlf" that disables the line-end conversion. It has been corrected. * A change back in version 2.7 to "git branch" broke display of a symbolic ref in a non-standard place in the refs/ hierarchy (we expect symbolic refs to appear in refs/remotes/*/HEAD to point at the primary branch the remote has, and as .git/HEAD to point at the branch we locally checked out). * A partial rewrite of "git submodule" in the 2.7 timeframe changed the way the gitdir: pointer in the submodules point at the real repository location to use absolute paths by accident. This has been corrected. * "git commit" misbehaved in a few minor ways when an empty message is given via -m '', all of which has been corrected. * Support for CRAM-MD5 authentication method in "git imap-send" did not work well. * Upcoming OpenSSL 1.1.0 will break compilation b updating a few APIs we use in imap-send, which has been adjusted for the change. (merge 1245c74 ky/imap-send-openssl-1.1.0 later to maint). * The socks5:// proxy support added back in 2.6.4 days was not aware that socks5h:// proxies behave differently. * "git config" had a codepath that tried to pass a NULL to printf("%s"), which nobody seems to have noticed. * On Cygwin, object creation uses the "create a temporary and then rename it to the final name" pattern, not "create a temporary, hardlink it to the final name and then unlink the temporary" pattern. This is necessary to use Git on Windows shared directories, and is already enabled for the MinGW and plain Windows builds. It also has been used in Cygwin packaged versions of Git for quite a while. See http://thread.gmane.org/gmane.comp.version-control.git/291853 * "merge-octopus" strategy did not ensure that the index is clean when merge begins. * When "git merge" notices that the merge can be resolved purely at the tree level (without having to merge blobs) and the resulting tree happens to already exist in the object store, it forgot to update the index, which lead to an inconsistent state for later operations. * "git submodule" reports the paths of submodules the command recurses into, but this was incorrect when the command was not run from the root level of the superproject. (merge 2ab5660 sb/submodule-path-misc-bugs later to maint). * The "user.useConfigOnly" configuration variable makes it an error if users do not explicitly set user.name and user.email. However, its check was not done early enough and allowed another error to trigger, reporting that the default value we guessed from the system setting was unusable. This was a suboptimal end-user experience as we want the users to set user.name/user.email without relying on the auto-detection at all. (merge d3c06c1 da/user-useconfigonly later to maint). * "git mv old new" did not adjust the path for a submodule that lives as a subdirectory inside old/ directory correctly. (merge a127331 sb/mv-submodule-fix later to maint). * "git replace -e" did not honour "core.editor" configuration. (merge 36b1437 js/replace-edit-use-editor-configuration later to maint). * "git push" from a corrupt repository that attempts to push a large number of refs deadlocked; the thread to relay rejection notices for these ref updates blocked on writing them to the main thread, after the main thread at the receiving end notices that the push failed and decides not to read these notices and return a failure. (merge c4b2751 jk/push-client-deadlock-fix later to maint). * mmap emulation on Windows has been optimized and work better without consuming paging store when not needed. (merge d5425d1 js/win32-mmap later to maint). * A question by "git send-email" to ask the identity of the sender has been updated. (merge 0d6b21e jd/send-email-to-whom later to maint). * UI consistency improvements for "git mergetool". (merge cce076e nf/mergetool-prompt later to maint). * Other minor clean-ups and documentation updates (merge 8b5a3e9 kn/for-each-tag-branch later to maint). (merge 9c60d9f sb/misc-cleanups later to maint). (merge 7a6a44c cc/apply later to maint). (merge 6594883 nd/remove-unused later to maint). (merge 0ff7410 sg/test-lib-simplify-expr-away later to maint). (merge 060e776 jk/fix-attribute-macro-in-2.5 later to maint). (merge d16df0c rt/string-list-lookup-cleanup later to maint).