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