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Git 2.29 Release Notes
======================
Updates since v2.28
-------------------
UI, Workflows & Features
* "git help log" has been enhanced by sharing more material from the
documentation for the underlying "git rev-list" command.
* "git for-each-ref --format=<>" learned %(contents:size).
* "git merge" learned to selectively omit " into <branch>" at the end
of the title of default merge message with merge.suppressDest
configuration.
* The component to respond to "git fetch" request is made more
configurable to selectively allow or reject object filtering
specification used for partial cloning.
* Stop when "sendmail.*" configuration variables are defined, which
could be a mistaken attempt to define "sendemail.*" variables.
* The existing backends for "git mergetool" based on variants of vim
have been refactored and then support for "nvim" has been added.
* "git bisect" learns the "--first-parent" option to find the first
breakage along the first-parent chain.
* "git log --first-parent -p" showed patches only for single-parent
commits on the first-parent chain; the "--first-parent" option has
been made to imply "-m". Use "--no-diff-merges" to restore the
previous behaviour to omit patches for merge commits.
* The commit labels used to explain each side of conflicted hunks
placed by the sequencer machinery have been made more readable by
humans.
* The "--batch-size" option of "git multi-pack-index repack" command
is now used to specify that very small packfiles are collected into
one until the total size roughly exceeds it.
* The recent addition of SHA-256 support is marked as experimental in
the documentation.
* "git fetch" learned --no-write-fetch-head option to avoid writing
the FETCH_HEAD file.
* Command line completion (in contrib/) usually omits redundant,
deprecated and/or dangerous options from its output; it learned to
optionally include all of them.
Performance, Internal Implementation, Development Support etc.
* The changed-path Bloom filter is improved using ideas from an
independent implementation.
* Updates to the changed-paths bloom filter.
* The test framework has been updated so that most tests will run
with predictable (artificial) timestamps.
* Preliminary clean-up of the refs API in preparation for adding a
new refs backend "reftable".
* Dev support to limit the use of test_must_fail to only git commands.
* While packing many objects in a repository with a promissor remote,
lazily fetching missing objects from the promissor remote one by
one may be inefficient---the code now attempts to fetch all the
missing objects in batch (obviously this won't work for a lazy
clone that lazily fetches tree objects as you cannot even enumerate
what blobs are missing until you learn which trees are missing).
* The pretend-object mechanism checks if the given object already
exists in the object store before deciding to keep the data
in-core, but the check would have triggered lazy fetching of such
an object from a promissor remote.
* The argv_array API is useful for not just managing argv but any
"vector" (NULL-terminated array) of strings, and has seen adoption
to a certain degree. It has been renamed to "strvec" to reduce the
barrier to adoption.
* The final leg of SHA-256 transition plus doc updates. Note that
there is no inter-operability between SHA-1 and SHA-256
repositories yet.
* CMake support to build with MSVC for Windows bypassing the Makefile.
* A new helper function has_object() has been introduced to make it
easier to mark object existence checks that do and don't want to
trigger lazy fetches, and a few such checks are converted using it.
* A no-op replacement function implemented as a C preprocessor macro
does not perform as good a job as one implemented as a "static
inline" function in catching errors in parameters; replace the
former with the latter in <git-compat-util.h> header.
* Test framework update.
(merge d572f52a64 es/test-cmp-typocatcher later to maint).
* Updates to "git merge" tests, in preparation for a new merge
strategy backend.
* midx and commit-graph files now use the byte defined in their file
format specification for identifying the hash function used for
object names.
* The FETCH_HEAD is now always read from the filesystem regardless of
the ref backend in use, as its format is much richer than the
normal refs, and written directly by "git fetch" as a plain file..
Fixes since v2.28
-----------------
* "git clone --separate-git-dir=$elsewhere" used to stomp on the
contents of the existing directory $elsewhere, which has been
taught to fail when $elsewhere is not an empty directory.
(merge dfaa209a79 bw/fail-cloning-into-non-empty later to maint).
* With the base fix to 2.27 regresion, any new extensions in a v0
repository would still be silently honored, which is not quite
right. Instead, complain and die loudly.
(merge ec91ffca04 jk/reject-newer-extensions-in-v0 later to maint).
* Fetching from a lazily cloned repository resulted at the server
side in attempts to lazy fetch objects that the client side has,
many of which will not be available from the third-party anyway.
(merge 77aa0941ce jt/avoid-lazy-fetching-upon-have-check later to maint).
* Fix to an ancient bug caused by an over-eager attempt for
optimization.
(merge a98f7fb366 rs/add-index-entry-optim-fix later to maint).
* Pushing a ref whose name contains non-ASCII character with the
"--force-with-lease" option did not work over smart HTTP protocol,
which has been corrected.
(merge cd85b447bf bc/push-cas-cquoted-refname later to maint).
* "git mv src dst", when src is an unmerged path, errored out
correctly but with an incorrect error message to claim that src is
not tracked, which has been clarified.
(merge 9b906af657 ct/mv-unmerged-path-error later to maint).
* Fix to a regression introduced during 2.27 cycle.
(merge cada7308ad en/fill-directory-exponential later to maint).
* Command line completion (in contrib/) update.
(merge 688b87c81b mp/complete-show-color-moved later to maint).
* All "mergy" operations that internally use the merge-recursive
machinery should honor the merge.renormalize configuration, but
many of them didn't.
* Doc cleanup around "worktree".
(merge dc9c144be5 es/worktree-doc-cleanups later to maint).
* The "git blame --first-parent" option was not documented, but now
it is.
(merge 11bc12ae1e rp/blame-first-parent-doc later to maint).
* The logic to find the ref transaction hook script attempted to
cache the path to the found hook without realizing that it needed
to keep a copied value, as the API it used returned a transitory
buffer space. This has been corrected.
(merge 09b2aa30c9 ps/ref-transaction-hook later to maint).
* Recent versions of "git diff-files" shows a diff between the index
and the working tree for "intent-to-add" paths as a "new file"
patch; "git apply --cached" should be able to take "git diff-files"
and should act as an equivalent to "git add" for the path, but the
command failed to do so for such a path.
(merge 4c025c667e rp/apply-cached-with-i-t-a later to maint).
* "git diff [<tree-ish>] $path" for a $path that is marked with i-t-a
bit was not showing the mode bits from the working tree.
(merge cb0dd22b82 rp/ita-diff-modefix later to maint).
* Ring buffer with size 4 used for bin-hex translation resulted in a
wrong object name in the sequencer's todo output, which has been
corrected.
(merge 5da69c0dac ak/sequencer-fix-find-uniq-abbrev later to maint).
* When given more than one target line ranges, "git blame -La,b
-Lc,d" was over-eager to coalesce groups of original lines and
showed incorrect results, which has been corrected.
(merge c2ebaa27d6 jk/blame-coalesce-fix later to maint).
* The regexp to identify the function boundary for FORTRAN programs
has been updated.
(merge 75c3b6b2e8 pb/userdiff-fortran-update later to maint).
* A few end-user facing messages have been updated to be
hash-algorithm agnostic.
(merge 4279000d3e jc/object-names-are-not-sha-1 later to maint).
* "unlink" emulation on MinGW has been optimized.
(merge 680e0b4524 jh/mingw-unlink later to maint).
* The purpose of "git init --separate-git-dir" is to initialize a
new project with the repository separate from the working tree,
or, in the case of an existing project, to move the repository
(the .git/ directory) out of the working tree. It does not make
sense to use --separate-git-dir with a bare repository for which
there is no working tree, so disallow its use with bare
repositories.
(merge ccf236a23a es/init-no-separate-git-dir-in-bare later to maint).
* "ls-files -o" mishandled the top-level directory of another git
working tree that hangs in the current git working tree.
(merge ab282aa548 en/dir-nonbare-embedded later to maint).
* Fix some incorrect UNLEAK() annotations.
(merge 3e19816dc0 jk/unleak-fixes later to maint).
* Use more buffered I/O where we used to call many small write(2)s.
(merge a698d67b08 rs/more-buffered-io later to maint).
* The patch-id computation did not ignore the "incomplete last line"
marker like whitespaces.
(merge 82a62015a7 rs/patch-id-with-incomplete-line later to maint).
* Other code cleanup, docfix, build fix, etc.
(merge 84544f2ea3 sk/typofixes later to maint).
(merge b17f411ab5 ar/help-guides-doc later to maint).
(merge 98c6871fad rs/grep-simpler-parse-object-or-die-call later to maint).
(merge 861c4ce141 en/typofixes later to maint).
(merge 60e47f6773 sg/ci-git-path-fix-with-pyenv later to maint).
(merge e2bfa50ac3 jb/doc-packfile-name later to maint).
(merge 918d8ff780 es/worktree-cleanup later to maint).
(merge dc156bc31f ma/t1450-quotefix later to maint).
(merge 56e743426b en/merge-recursive-comment-fixes later to maint).
(merge 7d23ff818f rs/bisect-oid-to-hex-fix later to maint).
(merge de20baf2c9 ny/notes-doc-sample-update later to maint).
(merge f649aaaf82 so/rev-parser-errormessage-fix later to maint).
(merge 6103d58b7f bc/sha-256-cvs-svn-updates later to maint).
(merge ac900fddb7 ma/stop-progress-null-fix later to maint).
(merge e767963ab6 rs/upload-pack-sigchain-fix later to maint).
(merge a831908599 rs/preserve-merges-unused-code-removal later to maint).
(merge 6dfefe70a9 jb/commit-graph-doc-fix later to maint).
(merge 847b37271e pb/set-url-docfix later to maint).
(merge 748f733d54 mt/checkout-entry-dead-code-removal later to maint).
(merge ce820cbd58 dl/subtree-docs later to maint).
(merge 55fe225dde jk/leakfix later to maint).
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