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Git 2.13 Release Notes
======================
Backward compatibility notes.
* Use of an empty string as a pathspec element that is used for
'everything matches' is still warned and Git asks users to use a
more explicit '.' for that instead. The hope is that existing
users will not mind this change, and eventually the warning can be
turned into a hard error, upgrading the deprecation into removal of
this (mis)feature. That is not scheduled to happen in the upcoming
release (yet).
* The historical argument order "git merge <msg> HEAD <commit>..."
has been deprecated for quite some time, and will be removed in a
future release.
Updates since v2.12
-------------------
UI, Workflows & Features
* "git describe" and "git name-rev" have been taught to take more
than one refname patterns to restrict the set of refs to base their
naming output on, and also learned to take negative patterns to
name refs not to be used for naming via their "--exclude" option.
* Deletion of a branch "foo/bar" could remove .git/refs/heads/foo
once there no longer is any other branch whose name begins with
"foo/", but we didn't do so so far. Now we do.
* When "git merge" detects a path that is renamed in one history
while the other history deleted (or modified) it, it now reports
both paths to help the user understand what is going on in the two
histories being merged.
* The <url> part in "http.<url>.<variable>" configuration variable
can now be spelled with '*' that serves as wildcard.
E.g. "http.https://*.example.com.proxy" can be used to specify the
proxy used for https://a.example.com, https://b.example.com, etc.,
i.e. any host in the example.com domain.
* "git tag" did not leave useful message when adding a new entry to
reflog; this was left unnoticed for a long time because refs/tags/*
doesn't keep reflog by default.
* The "negative" pathspec feature was somewhat more cumbersome to use
than necessary in that its short-hand used "!" which needed to be
escaped from shells, and it required "exclude from what?" specified.
* The command line options for ssh invocation needs to be tweaked for
some implementations of SSH (e.g. PuTTY plink wants "-P <port>"
while OpenSSH wants "-p <port>" to specify port to connect to), and
the variant was guessed when GIT_SSH environment variable is used
to specify it. The logic to guess now applies to the command
specified by the newer GIT_SSH_COMMAND and also core.sshcommand
configuration variable, and comes with an escape hatch for users to
deal with misdetected cases.
* The "--git-path", "--git-common-dir", and "--shared-index-path"
options of "git rev-parse" did not produce usable output. They are
now updated to show the path to the correct file, relative to where
the caller is.
* "git diff -W" has been taught to handle the case where a new
function is added at the end of the file better.
* "git update-ref -d" and other operations to delete references did
not leave any entry in HEAD's reflog when the reference being
deleted was the current branch. This is not a problem in practice
because you do not want to delete the branch you are currently on,
but caused renaming of the current branch to something else not to
be logged in a useful way.
Performance, Internal Implementation, Development Support etc.
* The code to list branches in "git branch" has been consolidated
with the more generic ref-filter API.
* Resource usage while enumerating refs from alternate object store
has been optimized to help receiving end of "push" that hosts a
repository with many "forks".
* The gitattributes machinery is being taught to work better in a
multi-threaded environment.
* "git rebase -i" starts using the recently updated "sequencer" code.
* Code and design clean-up for the refs API.
* The preload-index code has been taught not to bother with the index
entries that are paths that are not checked out by "sparse checkout".
* Some warning() messages from "git clean" were updated to show the
errno from failed system calls.
Also contains various documentation updates and code clean-ups.
Fixes since v2.12
-----------------
Unless otherwise noted, all the fixes since v2.9 in the maintenance
track are contained in this release (see the maintenance releases'
notes for details).
* "git repack --depth=<n>" for a long time busted the specified depth
when reusing delta from existing packs. This has been corrected.
(merge 42b766d765 jk/delta-chain-limit later to maint).
* The code to parse the command line "git grep <patterns>... <rev>
[[--] <pathspec>...]" has been cleaned up, and a handful of bugs
have been fixed (e.g. we used to check "--" if it is a rev).
(merge 131f3c96d2 jk/grep-no-index-fix later to maint).
* "git ls-remote" and "git archive --remote" are designed to work
without being in a directory under Git's control. However, recent
updates revealed that we randomly look into a directory called
.git/ without actually doing necessary set-up when working in a
repository. Stop doing so.
(merge 4b0c3c7735 jn/remote-helpers-with-git-dir later to maint).
* "git show-branch" expected there were only very short branch names
in the repository and used a fixed-length buffer to hold them
without checking for overflow.
(merge d3cc5f4c44 jk/show-branch-lift-name-len-limit later to maint).
* A caller of tempfile API that uses stdio interface to write to
files may ignore errors while writing, which is detected when
tempfile is closed (with a call to ferror()). By that time, the
original errno that may have told us what went wrong is likely to
be long gone and was overwritten by an irrelevant value.
close_tempfile() now resets errno to EIO to make errno at least
predictable.
(merge 7e8c9355b7 jk/tempfile-ferror-fclose-confusion later to maint).
* "git remote rm X", when a branch has remote X configured as the
value of its branch.*.remote, tried to remove branch.*.remote and
branch.*.merge and failed if either is unset.
(merge 20690b2139 rl/remote-allow-missing-branch-name-merge later to maint).
* A "gc.log" file left by a backgrounded "gc --auto" disables further
automatic gc; it has been taught to run at least once a day (by
default) by ignoring a stale "gc.log" file that is too old.
(merge a831c06a2b dt/gc-ignore-old-gc-logs later to maint).
* Other minor doc, test and build updates and code cleanups.
(merge 2cfa83574c mm/two-more-xstrfmt later to maint).
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