168 lines
7.3 KiB
Plaintext
168 lines
7.3 KiB
Plaintext
Git Release Notes
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=================
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Backward Compatibility Notes
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----------------------------
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* "git branch -l <foo>" used to be a way to ask a reflog to be
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created while creating a new branch, but that is no longer the
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case. It is a short-hand for "git branch --list <foo>" now.
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* "git push" into refs/tags/* hierarchy is rejected without getting
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forced, but "git fetch" (misguidedly) used the "fast forwarding"
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rule used for the refs/heads/* hierarchy; this has been corrected,
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which means some fetches of tags that did not fail with older
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version of Git will fail without "--force" with this version.
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Updates since v2.19
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-------------------
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UI, Workflows & Features
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* Running "git clone" against a project that contain two files with
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pathnames that differ only in cases on a case insensitive
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filesystem would result in one of the files lost because the
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underlying filesystem is incapable of holding both at the same
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time. An attempt is made to detect such a case and warn.
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* "git checkout -b newbranch [HEAD]" should not have to do as much as
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checking out a commit different from HEAD. An attempt is made to
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optimize this special case.
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* "git rev-list --stdin </dev/null" used to be an error; it now shows
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no output without an error. "git rev-list --stdin --default HEAD"
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still falls back to the given default when nothing is given on the
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standard input.
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* Lift code from GitHub to restrict delta computation so that an
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object that exists in one fork is not made into a delta against
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another object that does not appear in the same forked repository.
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* "git format-patch" learned new "--interdiff" and "--range-diff"
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options to explain the difference between this version and the
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previous attempt in the cover letter (or after the tree-dashes as
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a comment).
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* "git mailinfo" used in "git am" learned to make a best-effort
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recovery of a patch corrupted by MUA that sends text/plain with
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format=flawed option.
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(merge 3aa4d81f88 rs/mailinfo-format-flowed later to maint).
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* The rules used by "git push" and "git fetch" to determine if a ref
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can or cannot be updated were inconsistent; specifically, fetching
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to update existing tags were allowed even though tags are supposed
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to be unmoving anchoring points. "git fetch" was taught to forbid
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updates to existing tags without the "--force" option.
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Performance, Internal Implementation, Development Support etc.
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* When there are too many packfiles in a repository (which is not
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recommended), looking up an object in these would require
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consulting many pack .idx files; a new mechanism to have a single
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file that consolidates all of these .idx files is introduced.
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* "git submodule update" is getting rewritten piece-by-piece into C.
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* The code for computing history reachability has been shuffled,
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obtained a bunch of new tests to cover them, and then being
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improved.
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* The unpack_trees() API used in checking out a branch and merging
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walks one or more trees along with the index. When the cache-tree
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in the index tells us that we are walking a tree whose flattened
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contents is known (i.e. matches a span in the index), as linearly
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scanning a span in the index is much more efficient than having to
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open tree objects recursively and listing their entries, the walk
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can be optimized, which has been done.
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* When creating a thin pack, which allows objects to be made into a
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delta against another object that is not in the resulting pack but
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is known to be present on the receiving end, the code learned to
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take advantage of the reachability bitmap; this allows the server
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to send a delta against a base beyond the "boundary" commit.
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* spatch transformation to replace boolean uses of !hashcmp() to
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newly introduced oideq() is added, and applied, to regain
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performance lost due to support of multiple hash algorithms.
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* Fix a bug in which the same path could be registered under multiple
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worktree entries if the path was missing (for instance, was removed
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manually). Also, as a convenience, expand the number of cases in
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which --force is applicable.
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Fixes since v2.19
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-----------------
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* "git interpret-trailers" and its underlying machinery had a buggy
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code that attempted to ignore patch text after commit log message,
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which triggered in various codepaths that will always get the log
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message alone and never get such an input.
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(merge 66e83d9b41 jk/trailer-fixes later to maint).
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* Malformed or crafted data in packstream can make our code attempt
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to read or write past the allocated buffer and abort, instead of
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reporting an error, which has been fixed.
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* "git rebase -i" did not clear the state files correctly when a run
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of "squash/fixup" is aborted and then the user manually amended the
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commit instead, which has been corrected.
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(merge 10d2f35436 js/rebase-i-autosquash-fix later to maint).
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* When fsmonitor is in use, after operation on submodules updates
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.gitmodules, we lost track of the fact that we did so and relied on
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stale fsmonitor data.
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(merge 43f1180814 bp/mv-submodules-with-fsmonitor later to maint).
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* Fix for a long-standing bug that leaves the index file corrupt when
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it shrinks during a partial commit.
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(merge 6c003d6ffb jk/reopen-tempfile-truncate later to maint).
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* Further fix for O_APPEND emulation on Windows
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(merge eeaf7ddac7 js/mingw-o-append later to maint).
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* A corner case bugfix in "git rerere" code.
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(merge ad2bf0d9b4 en/rerere-multi-stage-1-fix later to maint).
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* "git add ':(attr:foo)'" is not supported and is supposed to be
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rejected while the command line arguments are parsed, but we fail
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to reject such a command line upfront.
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(merge 84d938b732 nd/attr-pathspec-fix later to maint).
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* Recent update broke the reachability algorithm when refs (e.g.
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tags) that point at objects that are not commit were involved,
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which has been fixed.
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* "git rebase" etc. in Git 2.19 fails to abort when given an empty
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commit log message as result of editing, which has been corrected.
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(merge a3ec9eaf38 en/sequencer-empty-edit-result-aborts later to maint).
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* The code to backfill objects in lazily cloned repository did not
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work correctly, which has been corrected.
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(merge e68302011c jt/lazy-object-fetch-fix later to maint).
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* Update error messages given by "git remote" and make them consistent.
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(merge 5025425dff ms/remote-error-message-update later to maint).
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* "git update-ref" learned to make both "--no-deref" and "--stdin"
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work at the same time.
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(merge d345e9fbe7 en/update-ref-no-deref-stdin later to maint).
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* Recently added "range-diff" had a corner-case bug to cause it
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segfault, which has been corrected.
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(merge e467a90c7a tg/range-diff-corner-case-fix later to maint).
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* Code cleanup, docfix, build fix, etc.
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(merge 96a7501aad ts/doc-build-manpage-xsl-quietly later to maint).
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(merge b9b07efdb2 tg/conflict-marker-size later to maint).
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(merge fa0aeea770 sg/doc-trace-appends later to maint).
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(merge d64324cb60 tb/void-check-attr later to maint).
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(merge c3b9bc94b9 en/double-semicolon-fix later to maint).
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(merge 79336116f5 sg/t3701-tighten-trace later to maint).
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(merge 801fa63a90 jk/dev-build-format-security later to maint).
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(merge 0597dd62ba sb/string-list-remove-unused later to maint).
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(merge db2d36fad8 bw/protocol-v2 later to maint).
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(merge 456d7cd3a9 sg/split-index-test later to maint).
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