451 lines
20 KiB
Text
451 lines
20 KiB
Text
Git 2.21 Release Notes
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======================
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Backward Compatibility Notes
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----------------------------
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* Historically, the "-m" (mainline) option can only be used for "git
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cherry-pick" and "git revert" when working with a merge commit.
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This version of Git no longer warns or errors out when working with
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a single-parent commit, as long as the argument to the "-m" option
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is 1 (i.e. it has only one parent, and the request is to pick or
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revert relative to that first parent). Scripts that relied on the
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behaviour may get broken with this change.
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Updates since v2.20
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-------------------
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UI, Workflows & Features
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* The "http.version" configuration variable can be used with recent
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enough versions of cURL library to force the version of HTTP used
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to talk when fetching and pushing.
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* Small fixes and features for fast-export and fast-import, mostly on
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the fast-export side has been made.
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* "git push $there $src:$dst" rejects when $dst is not a fully
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qualified refname and it is not clear what the end user meant. The
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codepath has been taught to give a clearer error message, and also
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guess where the push should go by taking the type of the pushed
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object into account (e.g. a tag object would want to go under
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refs/tags/).
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* "git checkout [<tree-ish>] path..." learned to report the number of
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paths that have been checked out of the index or the tree-ish,
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which gives it the same degree of noisy-ness as the case in which
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the command checks out a branch. "git checkout -m <pathspec>" to
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undo conflict resolution gives a similar message.
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* "git quiltimport" learned "--keep-non-patch" option.
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* "git worktree remove" and "git worktree move" refused to work when
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there is a submodule involved. This has been loosened to ignore
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uninitialized submodules.
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* "git cherry-pick -m1" was forbidden when picking a non-merge
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commit, even though there _is_ parent number 1 for such a commit.
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This was done to avoid mistakes back when "cherry-pick" was about
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picking a single commit, but is no longer useful with "cherry-pick"
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that can pick a range of commits. Now the "-m$num" option is
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allowed when picking any commit, as long as $num names an existing
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parent of the commit.
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* Update "git multimail" from the upstream.
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* "git p4" update.
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* The "--format=<placeholder>" option of for-each-ref, branch and tag
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learned to show a few more traits of objects that can be learned by
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the object_info API.
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* "git rebase -i" learned to re-execute a command given with 'exec'
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to run after it failed the last time.
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* "git diff --color-moved-ws" updates.
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* Custom userformat "log --format" learned %S atom that stands for
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the tip the traversal reached the commit from, i.e. --source.
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* "git instaweb" learned to drive http.server that comes with
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"batteries included" Python installation (both Python2 & 3).
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* A new encoding UTF-16LE-BOM has been invented to force encoding to
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UTF-16 with BOM in little endian byte order, which cannot be directly
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generated by using iconv.
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* A new date format "--date=human" that morphs its output depending
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on how far the time is from the current time has been introduced.
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"--date=auto:human" can be used to use this new format (or any
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existing format) when the output is going to the pager or to the
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terminal, and otherwise the default format.
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Performance, Internal Implementation, Development Support etc.
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* Code clean-up with optimization for the codepath that checks
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(non-)existence of loose objects.
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* More codepaths have become aware of working with in-core repository
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instances other than the default "the_repository".
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* The "strncat()" function is now among the banned functions.
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* Portability updates for the HPE NonStop platform.
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* Earlier we added "-Wformat-security" to developer builds, assuming
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that "-Wall" (which includes "-Wformat" which in turn is required
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to use "-Wformat-security") is always in effect. This is not true
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when config.mak.autogen is in use, unfortunately. This has been
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fixed by unconditionally adding "-Wall" to developer builds.
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* The loose object cache used to optimize existence look-up has been
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updated.
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* Flaky tests can now be repeatedly run under load with the
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"--stress" option.
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* Documentation/Makefile is getting prepared for manpage
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localization.
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* "git fetch-pack" now can talk the version 2 protocol.
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* sha-256 hash has been added and plumbed through the code to allow
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building Git with the "NewHash".
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* Debugging help for http transport.
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* "git fetch --deepen=<more>" has been corrected to work over v2
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protocol.
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* The code to walk tree objects has been taught that we may be
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working with object names that are not computed with SHA-1.
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* The in-core repository instances are passed through more codepaths.
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* Update the protocol message specification to allow only the limited
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use of scaled quantities. This is to ensure potential compatibility
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issues will not get out of hand.
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* Micro-optimize the code that prepares commit objects to be walked
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by "git rev-list" when the commit-graph is available.
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* "git fetch" and "git upload-pack" learned to send all exchanges over
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the sideband channel while talking the v2 protocol.
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* The codepath to write out commit-graph has been optimized by
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following the usual pattern of visiting objects in in-pack order.
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* The codepath to show progress meter while writing out commit-graph
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file has been improved.
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* Cocci rules have been updated to encourage use of strbuf_addbuf().
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* "git rebase --merge" has been reimplemented by reusing the internal
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machinery used for "git rebase -i".
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* More code in "git bisect" has been rewritten in C.
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* Instead of going through "git-rebase--am" scriptlet to use the "am"
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backend, the built-in version of "git rebase" learned to drive the
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"am" backend directly.
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* The assumption to work on the single "in-core index" instance has
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been reduced from the library-ish part of the codebase.
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* The test lint learned to catch non-portable "sed" options.
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* "git pack-objects" learned another algorithm to compute the set of
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objects to send, that trades the resulting packfile off to save
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traversal cost to favor small pushes.
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* The travis CI scripts have been corrected to build Git with the
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compiler(s) of our choice.
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* "git submodule update" learned to abort early when core.worktree
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for the submodule is not set correctly to prevent spreading damage.
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* Test suite has been adjusted to run on Azure Pipeline.
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* Running "Documentation/doc-diff x" from anywhere other than the
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top-level of the working tree did not show the usage string
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correctly, which has been fixed.
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* Use of the sparse tool got easier to customize from the command
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line to help developers.
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* A new target "coverage-prove" to run the coverage test under
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"prove" has been added.
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* A flakey "p4" test has been removed.
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* The code and tests assume that the system supplied iconv() would
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always use BOM in its output when asked to encode to UTF-16 (or
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UTF-32), but apparently some implementations output big-endian
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without BOM. A compile-time knob has been added to help such
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systems (e.g. NonStop) to add BOM to the output to increase
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portability.
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Fixes since v2.20
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-----------------
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* Updates for corner cases in merge-recursive.
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(merge cc4cb0902c en/merge-path-collision later to maint).
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* "git checkout frotz" (without any double-dash) avoids ambiguity by
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making sure 'frotz' cannot be interpreted as a revision and as a
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path at the same time. This safety has been updated to check also
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a unique remote-tracking branch 'frotz' in a remote, when dwimming
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to create a local branch 'frotz' out of a remote-tracking branch
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'frotz' from a remote.
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(merge be4908f103 nd/checkout-dwim-fix later to maint).
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* Refspecs configured with "git -c var=val clone" did not propagate
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to the resulting repository, which has been corrected.
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(merge 7eae4a3ac4 sg/clone-initial-fetch-configuration later to maint).
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* A properly configured username/email is required under
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user.useConfigOnly in order to create commits; now "git stash"
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(even though it creates commit objects to represent stash entries)
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command is exempt from the requirement.
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(merge 3bc2111fc2 sd/stash-wo-user-name later to maint).
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* The http-backend CGI process did not correctly clean up the child
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processes it spawns to run upload-pack etc. when it dies itself,
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which has been corrected.
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(merge 02818a98d7 mk/http-backend-kill-children-before-exit later to maint).
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* "git rev-list --exclude-promisor-objects" had to take an object
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that does not exist locally (and is lazily available) from the
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command line without barfing, but the code dereferenced NULL.
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(merge 4cf67869b2 md/list-lazy-objects-fix later to maint).
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* The traversal over tree objects has learned to honor
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":(attr:label)" pathspec match, which has been implemented only for
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enumerating paths on the filesystem.
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(merge 5a0b97b34c nd/attr-pathspec-in-tree-walk later to maint).
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* BSD port updates.
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(merge 4e3ecbd439 cb/openbsd-allows-reading-directory later to maint).
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(merge b6bdc2a0f5 cb/t5004-empty-tar-archive-fix later to maint).
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(merge 82cbc8cde2 cb/test-lint-cp-a later to maint).
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* Lines that begin with a certain keyword that come over the wire, as
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well as lines that consist only of one of these keywords, ought to
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be painted in color for easier eyeballing, but the latter was
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broken ever since the feature was introduced in 2.19, which has
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been corrected.
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(merge 1f67290450 hn/highlight-sideband-keywords later to maint).
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* "git log -G<regex>" looked for a hunk in the "git log -p" patch
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output that contained a string that matches the given pattern.
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Optimize this code to ignore binary files, which by default will
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not show any hunk that would match any pattern (unless textconv or
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the --text option is in effect, that is).
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(merge e0e7cb8080 tb/log-G-binary later to maint).
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* "git submodule update" ought to use a single job unless asked, but
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by mistake used multiple jobs, which has been fixed.
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(merge e3a9d1aca9 sb/submodule-fetchjobs-default-to-one later to maint).
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* "git stripspace" should be usable outside a git repository, but
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under the "-s" or "-c" mode, it didn't.
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(merge 957da75802 jn/stripspace-wo-repository later to maint).
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* Some of the documentation pages formatted incorrectly with
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Asciidoctor, which have been fixed.
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(merge b62eb1d2f4 ma/asciidoctor later to maint).
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* The core.worktree setting in a submodule repository should not be
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pointing at a directory when the submodule loses its working tree
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(e.g. getting deinit'ed), but the code did not properly maintain
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this invariant.
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* With zsh, "git cmd path<TAB>" was completed to "git cmd path name"
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when the completed path has a special character like SP in it,
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without any attempt to keep "path name" a single filename. This
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has been fixed to complete it to "git cmd path\ name" just like
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Bash completion does.
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* The test suite tried to see if it is run under bash, but the check
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itself failed under some other implementations of shell (notably
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under NetBSD). This has been corrected.
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(merge 54ea72f09c sg/test-bash-version-fix later to maint).
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* "git gc" and "git repack" did not close the open packfiles that
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they found unneeded before removing them, which didn't work on a
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platform incapable of removing an open file. This has been
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corrected.
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(merge 5bdece0d70 js/gc-repack-close-before-remove later to maint).
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* The code to drive GIT_EXTERNAL_DIFF command relied on the string
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returned from getenv() to be non-volatile, which is not true, that
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has been corrected.
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(merge 6776a84dae kg/external-diff-save-env later to maint).
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* There were many places the code relied on the string returned from
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getenv() to be non-volatile, which is not true, that have been
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corrected.
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(merge 0da0e9268b jk/save-getenv-result later to maint).
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* The v2 upload-pack protocol implementation failed to honor
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hidden-ref configuration, which has been corrected.
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(merge e20b4192a3 jk/proto-v2-hidden-refs-fix later to maint).
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* "git fetch --recurse-submodules" may not fetch the necessary commit
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that is bound to the superproject, which is getting corrected.
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(merge be76c21282 sb/submodule-recursive-fetch-gets-the-tip later to maint).
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* "git rebase" internally runs "checkout" to switch between branches,
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and the command used to call the post-checkout hook, but the
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reimplementation stopped doing so, which is getting fixed.
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* "git add -e" got confused when the change it wants to let the user
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edit is smaller than the previous change that was left over in a
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temporary file.
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(merge fa6f225e01 js/add-e-clear-patch-before-stating later to maint).
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* "git p4" failed to update a shelved change when there were moved
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files, which has been corrected.
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(merge 7a10946ab9 ld/git-p4-shelve-update-fix later to maint).
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* The codepath to read from the commit-graph file attempted to read
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past the end of it when the file's table-of-contents was corrupt.
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* The compat/obstack code had casts that -Wcast-function-type
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compilation option found questionable.
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(merge 764473d257 sg/obstack-cast-function-type-fix later to maint).
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* An obvious typo in an assertion error message has been fixed.
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(merge 3c27e2e059 cc/test-ref-store-typofix later to maint).
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* In Git for Windows, "git clone \\server\share\path" etc. that uses
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UNC paths from command line had bad interaction with its shell
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emulation.
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* "git add --ignore-errors" did not work as advertised and instead
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worked as an unintended synonym for "git add --renormalize", which
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has been fixed.
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(merge e2c2a37545 jk/add-ignore-errors-bit-assignment-fix later to maint).
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* On a case-insensitive filesystem, we failed to compare the part of
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the path that is above the worktree directory in an absolute
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pathname, which has been corrected.
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* Asking "git check-attr" about a macro (e.g. "binary") on a specific
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path did not work correctly, even though "git check-attr -a" listed
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such a macro correctly. This has been corrected.
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(merge 7b95849be4 jk/attr-macro-fix later to maint).
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* "git pack-objects" incorrectly used uninitialized mutex, which has
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been corrected.
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(merge edb673cf10 ph/pack-objects-mutex-fix later to maint).
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* "git checkout -b <new> [HEAD]" to create a new branch from the
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current commit and check it out ought to be a no-op in the index
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and the working tree in normal cases, but there are corner cases
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that do require updates to the index and the working tree. Running
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it immediately after "git clone --no-checkout" is one of these
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cases that an earlier optimization kicked in incorrectly, which has
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been fixed.
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(merge 8424bfd45b bp/checkout-new-branch-optim later to maint).
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* "git diff --color-moved --cc --stat -p" did not work well due to
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funny interaction between a bug in color-moved and the rest, which
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has been fixed.
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(merge dac03b5518 jk/diff-cc-stat-fixes later to maint).
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* When GIT_SEQUENCE_EDITOR is set, the command was incorrectly
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started when modes of "git rebase" that implicitly uses the
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machinery for the interactive rebase are run, which has been
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corrected.
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(merge 891d4a0313 pw/no-editor-in-rebase-i-implicit later to maint).
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* The commit-graph facility did not work when in-core objects that
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are promoted from unknown type to commit (e.g. a commit that is
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accessed via a tag that refers to it) were involved, which has been
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corrected.
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(merge 4468d4435c sg/object-as-type-commit-graph-fix later to maint).
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* "git fetch" output cleanup.
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(merge dc40b24df4 nd/fetch-compact-update later to maint).
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* "git cat-file --batch" reported a dangling symbolic link by
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mistake, when it wanted to report that a given name is ambiguous.
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* Documentation around core.crlf has been updated.
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(merge c9446f0504 jk/autocrlf-overrides-eol-doc later to maint).
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* The documentation of "git commit-tree" said that the command
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understands "--gpg-sign" in addition to "-S", but the command line
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parser did not know about the longhand, which has been corrected.
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* "git rebase -x $cmd" did not reject multi-line command, even though
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the command is incapable of handling such a command. It now is
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rejected upfront.
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(merge c762aada1a pw/rebase-x-sanity-check later to maint).
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* Output from "git help" was not correctly aligned, which has been
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fixed.
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(merge 6195a76da4 nd/help-align-command-desc later to maint).
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* The "git submodule summary" subcommand showed shortened commit
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object names by mechanically truncating them at 7-hexdigit, which
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has been improved to let "rev-parse --short" scale the length of
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the abbreviation with the size of the repository.
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(merge 0586a438f6 sh/submodule-summary-abbrev-fix later to maint).
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* The way the OSX build jobs updates its build environment used the
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"--quiet" option to "brew update" command, but it wasn't all that
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quiet to be useful. The use of the option has been replaced with
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an explicit redirection to the /dev/null (which incidentally would
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have worked around a breakage by recent updates to homebrew, which
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has fixed itself already).
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(merge a1ccaedd62 sg/travis-osx-brew-breakage-workaround later to maint).
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* "git --work-tree=$there --git-dir=$here describe --dirty" did not
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work correctly as it did not pay attention to the location of the
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worktree specified by the user by mistake, which has been
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corrected.
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(merge c801170b0c ss/describe-dirty-in-the-right-directory later to maint).
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* "git fetch" over protocol v2 that needs to make a second connection
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to backfill tags did not clear a variable that holds shallow
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repository information correctly, leading to an access of freed
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piece of memory.
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* Some errors from the other side coming over smart HTTP transport
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were not noticed, which has been corrected.
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* Code cleanup, docfix, build fix, etc.
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(merge 89ba9a79ae hb/t0061-dot-in-path-fix later to maint).
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(merge d173e799ea sb/diff-color-moved-config-option-fixup later to maint).
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(merge a8f5a59067 en/directory-renames-nothanks-doc-update later to maint).
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(merge ec36c42a63 nd/indentation-fix later to maint).
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(merge f116ee21cd do/gitweb-strict-export-conf-doc later to maint).
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(merge 112ea42663 fd/gitweb-snapshot-conf-doc-fix later to maint).
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(merge 1cadad6f65 tb/use-common-win32-pathfuncs-on-cygwin later to maint).
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(merge 57e9dcaa65 km/rebase-doc-typofix later to maint).
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(merge b8b4cb27e6 ds/gc-doc-typofix later to maint).
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(merge 3b3357626e nd/style-opening-brace later to maint).
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(merge b4583d5595 es/doc-worktree-guessremote-config later to maint).
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(merge cce99cd8c6 ds/commit-graph-assert-missing-parents later to maint).
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(merge 0650614982 cy/completion-typofix later to maint).
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(merge 6881925ef5 rs/sha1-file-close-mapped-file-on-error later to maint).
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(merge bd8d6f0def en/show-ref-doc-fix later to maint).
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(merge 1747125e2c cc/partial-clone-doc-typofix later to maint).
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(merge e01378753d cc/fetch-error-message-fix later to maint).
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(merge 54e8c11215 jk/remote-insteadof-cleanup later to maint).
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(merge d609615f48 js/test-git-installed later to maint).
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(merge ba170517be ja/doc-style-fix later to maint).
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(merge 86fb1c4e77 km/init-doc-typofix later to maint).
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(merge 5cfd4a9d10 nd/commit-doc later to maint).
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(merge 9fce19a431 ab/diff-tree-doc-fix later to maint).
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(merge 2e285e7803 tz/gpg-test-fix later to maint).
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(merge 5427de960b kl/pretty-doc-markup-fix later to maint).
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(merge 3815f64b0d js/mingw-host-cpu later to maint).
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(merge 5fe81438b5 rj/sequencer-sign-off-header-static later to maint).
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(merge 18a4f6be6b nd/fileno-may-be-macro later to maint).
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(merge 99e9ab54ab kd/t0028-octal-del-is-377-not-777 later to maint).
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