git/Documentation/RelNotes/2.51.0.adoc

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Git v2.51 Release Notes
=======================
UI, Workflows & Features
------------------------
* Userdiff patterns for the R language have been added.
* Documentation for "git send-email" has been updated with a bit more
credential helper and OAuth information.
* "git cat-file --batch" learns to understand %(objectmode) atom to
allow the caller to tell missing objects (due to repository
corruption) and submodules (whose commit objects are OK to be
missing) apart.
* "git diff --no-index dirA dirB" can limit the comparison with
pathspec at the end of the command line, just like normal "git
diff".
* "git subtree" (in contrib/) learned to grok GPG signing its commits.
* "git whatchanged" that is longer to type than "git log --raw"
which is its modern rough equivalent has outlived its usefulness
more than 10 years ago. Plan to deprecate and remove it.
* An interchange format for stash entries is defined, and subcommand
of "git stash" to import/export has been added.
* "git merge/pull" has been taught the "--compact-summary" option to
use the compact-summary format, intead of diffstat, when showing
the summary of the incoming changes.
* "git imap-send" has been broken for a long time, which has been
resurrected and then taught to talk OAuth2.0 etc.
* Some error messages from "git imap-send" has been updated.
* When "git daemon" sees a signal while attempting to accept() a new
client, instead of retrying, it skipped it by mistake, which has
been corrected.
* The reftable ref backend has matured enough; Git 3.0 will make it
the default format in a newly created repositories by default.
* "netrc" credential helper has been improved to understand textual
service names (like smtp) in addition to the numeric port numbers
(like 25).
* Lift the limitation to use changed-path filter in "git log" so that
it can be used for a pathspec with multiple literal paths.
* Clean up the way how signature on commit objects are exported to
and imported from fast-import stream.
Performance, Internal Implementation, Development Support etc.
--------------------------------------------------------------
* "git pack-objects" learned to find delta bases from blobs at the
same path, using the --path-walk API.
* CodingGuidelines update.
* Add settings for Solaris 10 & 11.
* Meson-based build/test framework now understands TAP output
generated by our tests.
* "Do not explicitly initialize to zero" rule has been clarified in
the CodingGuidelines document.
* A test helper "test_seq" function learned the "-f <fmt>" option,
which allowed us to simplify a lot of test scripts.
* A lot of stale stuff has been removed from the contrib/ hierarchy.
* "git push" and "git fetch" are taught to update refs in batches to
gain performance.
* Some code paths in the "git prune" used to ignore passed in
repository object and used the_repository singleton instance
instead, which has been corrected.
* Update ".clang-format" and ".editorconfig" to match our style guide
a bit better.
* "make coccicheck" succeeds even when spatch made suggestions, which
has been updated to fail in such a case.
* Code clean-up around object access API.
* Define .precision to more canned parse-options type to avoid bugs
coming from using a variable with a wrong type to capture the
parsed values.
* Flipping the default hash function to SHA-256 at Git 3.0 boundary
is planned.
* Declare weather-balloon we raised for "bool" type 18 months ago a
success and officially allow using the type in our codebase.
* GIT_TEST_INSTALLED was not honored in the recent topic related to
SHA256 hashes, which has been corrected.
Fixes since v2.50
-----------------
Unless otherwise noted, all the changes in 2.50.X maintenance track,
including security updates, are included in this release.
* A memory-leak in an error code path has been plugged.
(merge 7082da85cb ly/commit-graph-graph-write-leakfix later to maint).
* A memory-leak in an error code path has been plugged.
(merge aedebdb6b9 ly/fetch-pack-leakfix later to maint).
* Some leftover references to documentation source files that no
longer exist, due to recent ".txt" -> ".adoc" renaming, have been
corrected.
(merge 3717a5775a jw/doc-txt-to-adoc-refs later to maint).
* "git stash -p <pathspec>" improvements.
(merge 468817bab2 pw/stash-p-pathspec-fixes later to maint).
* "git send-email" incremented its internal message counter when a
message was edited, which made logic that treats the first message
specially misbehave, which has been corrected.
(merge 2cc27b3501 ag/send-email-edit-threading-fix later to maint).
* "git stash" recorded a wrong branch name when submodules are
present in the current checkout, which has been corrected.
(merge ffb36c64f2 kj/stash-onbranch-submodule-fix later to maint).
* When asking to apply mailmap to both author and committer field
while showing a commit object, the field that appears later was not
correctly parsed and replaced, which has been corrected.
(merge abf94a283f sa/multi-mailmap-fix later to maint).
* "git maintenance" lacked the care "git gc" had to avoid holding
onto the repository lock for too long during packing refs, which
has been remedied.
(merge 1b5074e614 ps/maintenance-ref-lock later to maint).
* Avoid regexp_constraint and instead use comparison_constraint when
listing functions to exclude from application of coccinelle rules,
as spatch can be built with different regexp engine X-<.
(merge f2ad545813 jc/cocci-avoid-regexp-constraint later to maint).
* Updating submodules from the upstream did not work well when
submodule's HEAD is detached, which has been improved.
(merge ca62f524c1 jk/submodule-remote-lookup-cleanup later to maint).
* Remove unnecessary check from "git daemon" code.
(merge 0c856224d2 cb/daemon-fd-check-fix later to maint).
* Use of sysctl() system call to learn the total RAM size used on
BSDs has been corrected.
(merge 781c1cf571 cb/total-ram-bsd-fix later to maint).
* Drop FreeBSD 4 support and declare that we support only FreeBSD 12
or later, which has memmem() supported.
(merge 0392f976a7 bs/config-mak-freebsd later to maint).
* A diff-filter with negative-only specification like "git log
--diff-filter=d" did not trigger correctly, which has been fixed.
(merge 375ac087c5 jk/all-negative-diff-filter-fix later to maint).
* A failure to open the index file for writing due to conflicting
access did not state what went wrong, which has been corrected.
(merge 9455397a5c hy/read-cache-lock-error-fix later to maint).
* Tempfile removal fix in the codepath to sign commits with SSH keys.
(merge 4498127b04 re/ssh-sign-buffer-fix later to maint).
* Code and test clean-up around string-list API.
(merge 6e5b26c3ff sj/string-list later to maint).
* "git apply -N" should start from the current index and register
only new files, but it instead started from an empty index, which
has been corrected.
(merge 2b49d97fcb rp/apply-intent-to-add-fix later to maint).
* Leakfix with a new and a bit invasive test on pack-bitmap files.
(merge bfd5522e98 ly/load-bitmap-leakfix later to maint).
* "git fetch --prune" used to be O(n^2) expensive when there are many
refs, which has been corrected.
(merge 87d8d8c5d0 ph/fetch-prune-optim later to maint).
* When a ref creation at refs/heads/foo/bar fails, the files backend
now removes refs/heads/foo/ if the directory is otherwise not used.
(merge a3a7f20516 ps/refs-files-remove-empty-parent later to maint).
* "pack-objects" has been taught to avoid pointing into objects in
cruft packs from midx.
* "git remote" now detects remote names that overlap with each other
(e.g., remote nickname "outer" and "outer/inner" are used at the
same time), as it will lead to overlapping remote-tracking
branches.
(merge a5a727c448 jk/remote-avoid-overlapping-names later to maint).
* The gpg.program configuration variable, which names a pathname to
the (custom) GPG compatible program, can now be spelled with ~tilde
expansion.
(merge 7d275cd5c0 jb/gpg-program-variable-is-a-pathname later to maint).
* Our <sane-ctype.h> header file relied on that the system-supplied
<ctype.h> header is not later included, which would override our
macro definitions, but "amazon linux" broke this assumption. Fix
this by preemptively including <ctype.h> near the beginning of
<sane-ctype.h> ourselves.
(merge 9d3b33125f ps/sane-ctype-workaround later to maint).
* Clean-up compat/bswap.h mess.
(merge f4ac32c03a ss/compat-bswap-revamp later to maint).
* Meson-based build did not handle libexecdir setting correctly,
which has been corrected.
(merge 056dbe8612 rj/meson-libexecdir-fix later to maint).
* Document that we do not require "real" name when signing your
patches off.
(merge 1f0fed312a bc/contribution-under-non-real-names later to maint).
* Other code cleanup, docfix, build fix, etc.
(merge b257adb571 lo/my-first-ow-doc-update later to maint).
(merge 8b34b6a220 ly/sequencer-update-squash-is-fixup-only later to maint).
(merge 5dceb8bd05 ly/do-not-localize-bug-messages later to maint).
(merge 61372dd613 ly/commit-buffer-reencode-leakfix later to maint).
(merge 81cd1eef7d ly/pack-bitmap-root-leakfix later to maint).
(merge bfc9f9cc64 ly/submodule-update-failure-leakfix later to maint).
(merge 65dff89c6b ma/doc-diff-cc-headers later to maint).
(merge efb61591ee jm/bundle-uri-debug-output-to-fp later to maint).
(merge a3d278bb64 ly/prepare-show-merge-leakfix later to maint).
(merge 1fde1c5daf ac/preload-index-wo-the-repository later to maint).
(merge 855cfc65ae rm/t2400-modernize later to maint).
(merge 2939494284 ly/run-builtin-use-passed-in-repo later to maint).
(merge ff73f375bb jg/mailinfo-leakfix later to maint).
(merge 996f14c02b jj/doc-branch-markup-fix later to maint).
(merge 1e77de1864 cb/ci-freebsd-update-to-14.3 later to maint).
(merge b0e9d25865 jk/fix-leak-send-pack later to maint).
(merge f3a9558c8c bs/remote-helpers-doc-markup-fix later to maint).
(merge c4e9775c60 kh/doc-config-subcommands later to maint).
(merge de404249ab ps/perlless-test-fixes later to maint).
(merge 953049eed8 ts/merge-orig-head-doc-fix later to maint).
(merge 0c83bbc704 rj/freebsd-sysinfo-build-fix later to maint).
(merge ad7780b38f ps/doc-pack-refs-auto-with-files-backend-fix later to maint).
(merge f4fa8a3687 rh/doc-glob-pathspec-fix later to maint).
(merge b27be108c8 ja/doc-git-log-markup later to maint).
(merge 14d7583beb pw/config-kvi-remove-path later to maint).