git/Documentation/RelNotes/2.47.0.txt

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Git v2.47 Release Notes
=======================
UI, Workflows & Features
------------------------
* Many Porcelain commands that internally use the merge machinery
were taught to consistently honor the diff.algorithm configuration.
* A few descriptions in "git show-ref -h" have been clarified.
* A 'P' command to "git add -p" that passes the patch hunk to the
pager has been added.
* "git grep -W" omits blank lines that follow the found function at
the end of the file, just like it omits blank lines before the next
function.
* The value of http.proxy can have "path" at the end for a socks
proxy that listens to a unix-domain socket, but we started to
discard it when we taught proxy auth code path to use the
credential helpers, which has been corrected.
* The code paths to compact multiple reftable files have been updated
to correctly deal with multiple compaction triggering at the same
time.
* Support to specify ref backend for submodules has been enhanced.
* "git svn" has been taught about svn:global-ignores property
recent versions of Subversion has.
* The default object hash and ref backend format used to be settable
only with explicit command line option to "git init" and
environment variables, but now they can be configured in the user's
global and system wide configuration.
* "git send-email" learned "--translate-aliases" option that reads
addresses from the standard input and emits the result of applying
aliases on them to the standard output.
* 'git for-each-ref' learned a new "--format" atom to find the branch
that the history leading to a given commit "%(is-base:<commit>)" is
likely based on.
* The command line prompt support used to be littered with bash-isms,
which has been corrected to work with more shells.
* Support for the RUNTIME_PREFIX feature has been added to z/OS port.
* "git send-email" learned "--mailmap" option to allow rewriting the
recipient addresses.
* "git mergetool" learned to use VSCode as a merge backend.
* "git pack-redundant" has been marked for removal in Git 3.0.
* One-line messages to "die" and other helper functions will get LF
added by these helper functions, but many existing messages had an
unnecessary LF at the end, which have been corrected.
* The "scalar clone" command learned the "--no-tags" option.
* The environment GIT_ADVICE has been intentionally kept undocumented
to discourage its use by interactive users. Add documentation to
help tool writers.
Performance, Internal Implementation, Development Support etc.
--------------------------------------------------------------
* A build tweak knob has been simplified by not setting the value
that is already the default; another unused one has been removed.
* A CI job that use clang-format to check coding style issues in new
code has been added.
* The reviewing guidelines document now explicitly encourages people
to give positive reviews and how.
* Test script linter has been updated to catch an attempt to use
one-shot export construct "VAR=VAL func" for shell functions (which
does not work for some shells) better.
* Some project conventions have been added to CodingGuidelines.
* In the refs subsystem, implicit reliance of the_repository has been
eliminated; the repository associated with the ref store object is
used instead.
* Various tests in reftable library have been rewritten using the unit test
framework.
* A test that fails on an unusually slow machine was found, and made
less likely to cause trouble by lengthening the expiry value it
uses.
* An existing test of hashmap API has been rewritten with the
unit-test framework.
* A policy document that describes platform support levels and
expectation on platform stakeholders has been introduced.
* The refs API has been taught to give symref target information to
the users of ref iterators, allowing for-each-ref and friends to
avoid an extra ref_resolve_* API call per a symbolic ref.
* Unit-test framework has learned a simple control structure to allow
embedding test statements in-line instead of having to create a new
function to contain them.
* Incremental updates of multi-pack index files is getting worked on.
* Use of API functions that implicitly depend on the_repository
object in the config subsystem has been rewritten to pass a
repository object through the callchain.
* Unused parameters have been either marked as UNUSED to squelch
-Wunused warnings or dropped from many functions..
* The code in the reftable library has been cleaned up by discarding
unused "generic" interface.
* The underlying machinery for "git diff-index" has long been made to
expand the sparse index as needed, but the command fully expanded
the sparse index upfront, which now has been taught not to do.
* More trace2 events at key points on push and fetch code paths have
been added.
* Make our codebase compilable with the -Werror=unused-parameter
option.
* "git cat-file" works well with the sparse-index, and gets marked as
such.
Fixes since v2.46
-----------------
* "git add -p" by users with diff.suppressBlankEmpty set to true
failed to parse the patch that represents an unmodified empty line
with an empty line (not a line with a single space on it), which
has been corrected.
* "git checkout --ours" (no other arguments) complained that the
option is incompatible with branch switching, which is technically
correct, but found confusing by some users. It now says that the
user needs to give pathspec to specify what paths to checkout.
* It has been documented that we avoid "VAR=VAL shell_func" and why.
* "git rebase --help" referred to "offset" (the difference between
the location a change was taken from and the change gets replaced)
incorrectly and called it "fuzz", which has been corrected.
* "git notes add -m '' --allow-empty" and friends that take prepared
data to create notes should not invoke an editor, but it started
doing so since Git 2.42, which has been corrected.
* An expensive operation to prepare tracing was done in re-encoding
code path even when the tracing was not requested, which has been
corrected.
* More leakfixes.
* The credential helper to talk to OSX keychain sometimes sent
garbage bytes after the username, which has been corrected.
* A recent update broke "git ls-remote" used outside a repository,
which has been corrected.
* The patch parser in 'git apply' has been a bit more lenient against
unexpected mode bits, like 100664, recorded on extended header lines.
* "git config --value=foo --fixed-value section.key newvalue" barfed
when the existing value in the configuration file used the
valueless true syntax, which has been corrected.
* The patch parser in "git patch-id" has been tightened to avoid
getting confused by lines that look like a patch header in the log
message.
* "git reflog expire" failed to honor annotated tags when computing
reachable commits.
* A flakey test and incorrect calls to strtoX() functions have been
fixed.
* Follow-up on 2.45.1 regression fix.
* "git rev-list ... | git diff-tree -p --remerge-diff --stdin" should
behave more or less like "git log -p --remerge-diff" but instead it
crashed, forgetting to prepare a temporary object store needed.
* "git bundle unbundle" outside a repository triggered a BUG()
unnecessarily, which has been corrected.
* Maintenance tasks other than "gc" now properly go background when
"git maintenance" runs them.
* We created a useless pseudo-merge reachability bitmap that is about
0 commits, and attempted to include commits that are not in packs,
which made no sense. These bugs have been corrected.
(merge a72dfab8b8 tb/pseudo-merge-bitmap-fixes later to maint).
* "git rebase -x --quiet" was not quiet, which was corrected.
* The code path for compacting reftable files saw some bugfixes
against concurrent operation.
* The code forgot to discard unnecessary in-core commit buffer data
for commits that "git log --skip=<number>" traversed but omitted
from the output, which has been corrected.
* "git verify-pack" and "git index-pack" started dying outside a
repository, which has been corrected.
* A data corruption bug when multi-pack-index is used and the same
objects are stored in multiple packfiles has been corrected.
* "git pack-refs --auto" for the files backend was too aggressive,
which has been a bit tamed.
(merge c3459ae9ef ps/pack-refs-auto-heuristics later to maint).
* A file descriptor left open is now properly closed when "git
sparse-checkout" updates the sparse patterns.
* In a few corner cases "git diff --exit-code" failed to report
"changes" (e.g., renamed without any content change), which has
been corrected.
(merge 11591850dd rs/diff-exit-code-fix later to maint).
* Cygwin does have /dev/tty support that is needed by things like
single-key input mode.
(merge 39ba986b0e rj/cygwin-has-dev-tty later to maint).
* The interpret-trailers command failed to recognise the end of the
message when the commit log ends in an incomplete line.
(merge c02414a997 bl/trailers-and-incomplete-last-line-fix later to maint).
* Other code cleanup, docfix, build fix, etc.
(merge be10ac7037 jc/mailinfo-header-cleanup later to maint).
(merge 9a36ea37ae jc/doc-skip-fetch-all-and-prefetch later to maint).