git/Documentation/RelNotes/2.50.0.adoc

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Git v2.50 Release Notes
=======================
UI, Workflows & Features
------------------------
* A post-processing filter for "diff --raw" output has been
introduced.
* "git repack" learned "--combine-cruft-below-size" option that
controls how cruft-packs are combined.
* TCP keepalive behaviour on http transports can now be configured by
calling cURL library.
* Incrementally updating multi-pack index files.
* "git reflog" learns "drop" subcommand, that discards the entire
reflog data for a ref.
* A new userdiff driver for ".ini" format configuration files has
been added.
* The job to coalesce loose objects into packfiles in "git
maintenance" now has configurable batch size.
* "git clone" still gave the message about the default branch name;
this message has been turned into an advice message that can be
turned off.
* "git rev-list" learns machine-parsable output format that delimits
each field with NUL.
* "git maintenance" learns a new task to expire reflog entries.
* Auth-related (and unrelated) error handling in send-email has been
made more robust.
* Updating multiple references have only been possible in all-or-none
fashion with transactions, but it can be more efficient to batch
multiple updates even when some of them are allowed to fail in a
best-effort manner. A new "best effort batches of updates" mode
has been introduced.
* "git help --build-options" reports SHA-1 and SHA-256 backends used
in the build.
* "git cat-file --batch" and friends learned to allow "--filter=" to
omit certain objects, just like the transport layer does.
* "git blame --porcelain" mode now talks about unblamable lines and
lines that are blamed to an ignored commit.
Performance, Internal Implementation, Development Support etc.
--------------------------------------------------------------
* A handful of built-in command implementations have been rewritten
to use the repository instance supplied by git.c:run_builtin(), its
caller.
* "git fsck" becomes more careful when checking the refs.
* "git fast-export | git fast-import" learns to deal with commit and
tag objects with embedded signatures a bit better.
* The code paths to check whether a refname X is available (by seeing
if another ref X/Y exists, etc.) have been optimized.
* First step of deprecating and removing merge-recursive.
* In protocol v2 where the refs advertisement is constrained, we try
to tell the server side not to limit the advertisement when there
is no specific need to, which has been the source of confusion and
recent bugs. Revamp the logic to simplify.
* Update meson based build procedure for breaking changes support.
* Enable -Wunreachable-code for developer builds.
* Ensure what we write in assert() does not have side effects,
and introduce ASSERT() macro to mark those that cannot be
mechanically checked for lack of side effects.
* Give more meaningful error return values from block writer layer of
the reftable ref-API backend.
* Make the code in reftable library less reliant on the service
routines it used to borrow from Git proper, to make it easier to
use by external users of the library.
* CI update.
* The object layer has been updated to take an explicit repository
instance as a parameter in more code paths.
* Some warnings from "-Wsign-compare" for builtin/rm.c have been
squelched.
* A few traditional unit tests have been rewritten to use the clar
framework.
* Some warnings from "-Wsign-compare" for pathspec.c have been
squelched.
* "make test" used to have a hard dependency on (basic) Perl; tests
have been rewritten help environment with NO_PERL test the build as
much as possible.
* Remove remnants of the recursive merge strategy backend, which was
superseded by the ort merge strategy.
Fixes since v2.49
-----------------
* The refname exclusion logic in the packed-ref backend has been
broken for some time, which confused upload-pack to advertise
different set of refs. This has been corrected.
(merge 10e8a9352b tb/refs-exclude-fixes later to maint).
* The merge-recursive and merge-ort machinery crashed in corner cases
when certain renames are involved.
(merge 3adba40858 en/merge-process-renames-crash-fix later to maint).
* Certain "cruft" objects would have never been refreshed when there
are multiple cruft packs in the repository, which has been
corrected.
(merge 08f612ba70 tb/multi-cruft-pack-refresh-fix later to maint).
* The xdiff code on 32-bit platform misbehaved when an insanely large
context size is given, which has been corrected.
(merge d39e28e68c rs/xdiff-context-length-fix later to maint).
* GitHub Actions CI switched on a CI/CD variable that does not exist
when choosing what packages to install etc., which has been
corrected.
(merge ee89f7c79d kn/ci-meson-check-build-docs-fix later to maint).
* Using "git name-rev --stdin" as an example, improve the framework to
prepare tests to pretend to be in the future where the breaking
changes have already happened.
(merge de3dec1187 jc/name-rev-stdin later to maint).
* An earlier code refactoring of the hash machinery missed a few
required calls to init_fn.
(merge d39f04b638 jh/hash-init-fixes later to maint).
* A documentation page was left out from formatting and installation,
which has been corrected.
(merge ae85116f18 pw/build-breaking-changes-doc later to maint).
* The bash command line completion script (in contrib/) has been
updated to cope with remote repository nicknames with slashes in
them.
(merge 778d2f1760 dm/completion-remote-names-fix later to maint).
* "Dubious ownership" checks on Windows has been tightened up.
(merge 5bb88e89ef js/mingw-admins-are-special later to maint).
* Layout configuration in vimdiff backend didn't work as advertised,
which has been corrected.
(merge 93bab2d04b fr/vimdiff-layout-fixes later to maint).
* Fix our use of zlib corner cases.
(merge 1cb2f293f5 jk/zlib-inflate-fixes later to maint).
* Fix lockfile contention in reftable code on Windows.
(merge 0a3dceabf1 ps/mingw-creat-excl-fix later to maint).
* "git-merge-file" documentation source, which has lines that look
like conflict markers, lacked custom conflict marker size defined,
which has been corrected..
(merge d3b5832381 pw/custom-conflict-marker-size-for-merge-related-docs later to maint).
* Squelch false-positive from sparse.
(merge da87b58014 dd/sparse-glibc-workaround later to maint).
* Adjust to the deprecation of use of Ubuntu 20.04 GitHub Actions CI.
(merge 832d9f6d0b js/ci-github-update-ubuntu later to maint).
* Work around CI breakage due to fedora base image getting updated.
(merge 8a471a663b js/ci-fedora-gawk later to maint).
* A ref transaction corner case fix.
(merge b9fadeead7 jt/ref-transaction-abort-fix later to maint).
* Random build fixes.
(merge 85e1d6819f ps/misc-build-fixes later to maint).
* "git fetch [<remote>]" with only the configured fetch refspec
should be the only thing to update refs/remotes/<remote>/HEAD,
but the code was overly eager to do so in other cases.
* Incorrect sorting of refs with bytes with high-bit set on platforms
with signed char led to a BUG, which has been corrected.
* Other code cleanup, docfix, build fix, etc.
(merge 227c4f33a0 ja/doc-block-delimiter-markup-fix later to maint).
(merge 2bfd3b3685 ab/decorate-code-cleanup later to maint).
(merge 5337daddc7 am/dir-dedup-decl-of-repository later to maint).
(merge 554051d691 en/diff-rename-follow-fix later to maint).
(merge a18c18b470 en/random-cleanups later to maint).
(merge 5af21c9acb hj/doc-rev-list-ancestry-fix later to maint).
(merge 26d76ca284 aj/doc-restore-p-update later to maint).
(merge 2c0dcb9754 cc/lop-remote later to maint).
(merge 7b399322a2 ja/doc-branch-markup later to maint).
(merge ee434e1807 pw/doc-pack-refs-markup-fix later to maint).
(merge c000918eb7 tb/bitamp-typofix later to maint).
(merge fa8cd29676 js/imap-send-peer-cert-verify later to maint).
(merge 98b423bc1c rs/clear-commit-marks-simplify later to maint).
(merge 133d065dd6 ta/bulk-checkin-signed-compare-false-warning-fix later to maint).
(merge d2827dc31e es/meson-build-skip-coccinelle later to maint).
(merge ee8edb7156 dk/vimdiff-doc-fix later to maint).
(merge 107d889303 md/t1403-path-is-file later to maint).
(merge abd4192b07 js/comma-semicolon-confusion later to maint).
(merge 27b7264206 ab/environment-clean-header later to maint).