Git 2.15 Release Notes
======================

Backward compatibility notes and other notable changes.

 * 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 now scheduled to happen in the upcoming
   release.

 * Git now avoids blindly falling back to ".git" when the setup
   sequence said we are _not_ in Git repository.  A corner case that
   happens to work right now may be broken by a call to die("BUG").
   We've tried hard to locate such cases and fixed them, but there
   might still be cases that need to be addressed--bug reports are
   greatly appreciated.


Updates since v2.14
-------------------

UI, Workflows & Features

 * An example that is now obsolete has been removed from a sample hook,
   and an old example in it that added a sign-off manually has been
   improved to use the interpret-trailers command.

 * The advice message given when "git rebase" stops for conflicting
   changes has been improved.

 * The "rerere-train" script (in contrib/) learned the "--overwrite"
   option to allow overwriting existing recorded resolutions.
   (merge ad53bf79aa rg/rerere-train-overwrite later to maint).

 * "git contacts" (in contrib/) now lists the address on the
   "Reported-by:" trailer to its output, in addition to those on
   S-o-b: and other trailers, to make it easier to notify (and thank)
   the original bug reporter.
   (merge 09ac673788 eb/contacts-reported-by later to maint).


Performance, Internal Implementation, Development Support etc.

 * Conversion from uchar[20] to struct object_id continues.

 * Start using selected c99 constructs in small, stable and
   essentialpart of the system to catch people who care about
   older compilers that do not grok them.

 * The filter-process interface learned to allow a process with long
   latency give a "delayed" response.

 * Many uses of comparision callback function the hashmap API uses
   cast the callback function type when registering it to
   hashmap_init(), which defeats the compile time type checking when
   the callback interface changes (e.g. gaining more parameters).
   The callback implementations have been updated to take "void *"
   pointers and cast them to the type they expect instead.

 * Because recent Git for Windows do come with a real msgfmt, the
   build procedure for git-gui has been updated to use it instead of a
   hand-rolled substitute.
   (merge 90dbf226ba js/git-gui-msgfmt-on-windows later to maint).


Also contains various documentation updates and code clean-ups.


Fixes since v2.14
-----------------

 * "%C(color name)" in the pretty print format always produced ANSI
   color escape codes, which was an early design mistake.  They now
   honor the configuration (e.g. "color.ui = never") and also tty-ness
   of the output medium.
   (merge 11b087adfd jk/ref-filter-colors later to maint).

 * The http.{sslkey,sslCert} configuration variables are to be
   interpreted as a pathname that honors "~[username]/" prefix, but
   weren't, which has been fixed.
   (merge 8d1549643e jc/http-sslkey-and-ssl-cert-are-paths later to maint).

 * Numerous bugs in walking of reflogs via "log -g" and friends have
   been fixed.
   (merge de239446b6 jk/reflog-walk later to maint).

 * "git commit" when seeing an totally empty message said "you did not
   edit the message", which is clearly wrong.  The message has been
   corrected.
   (merge bc17f35f8c ks/commit-abort-on-empty-message-fix later to maint).

 * When a directory is not readable, "gitweb" fails to build the
   project list.  Work this around by skipping such a directory.
   (merge 46a13857fc hb/gitweb-project-list later to maint).

 * Some versions of GnuPG fails to kill gpg-agent it auto-spawned
   and such a left-over agent can interfere with a test.  Work it
   around by attempting to kill one before starting a new test.
   (merge 29ff1f8f74 st/lib-gpg-kill-stray-agent later to maint).

 * A recently added test for the "credential-cache" helper revealed
   that EOF detection done around the time the connection to the cache
   daemon is torn down were flaky.  This was fixed by reacting to
   ECONNRESET and behaving as if we got an EOF.
   (merge 1f180e5eb9 dl/credential-cache-socket-in-xdg-cache later to maint).

 * "git log --tag=no-such-tag" showed log starting from HEAD, which
   has been fixed---it now shows nothing.
   (merge 5d34d1ac06 jk/rev-list-empty-input later to maint).

 * The "tag.pager" configuration variable was useless for those who
   actually create tag objects, as it interfered with the use of an
   editor.  A new mechanism has been introduced for commands to enable
   pager depending on what operation is being carried out to fix this,
   and then "git tag -l" is made to run pager by default.
   (merge 595d59e2b5 ma/pager-per-subcommand-action later to maint).

 * Other minor doc, test and build updates and code cleanups.
   (merge 5b114f3bb0 rs/bswap-ubsan-fix later to maint).
   (merge 168e63554c rs/move-array later to maint).
   (merge 268ba20110 rs/stat-data-unaligned-reads-fix later to maint).
   (merge 78e7b98f45 jt/fsck-code-cleanup later to maint).
   (merge c7b0780545 rs/pack-objects-pbase-cleanup later to maint).
   (merge c1e860f1dc js/run-process-parallel-api-fix later to maint).
   (merge 7a40a95eb4 cc/ref-is-hidden-microcleanup later to maint).
   (merge c0bb6d9cef ah/doc-wserrorhighlight later to maint).
   (merge edd64ef4f7 dc/fmt-merge-msg-microcleanup later to maint).
   (merge fa64a2fdbe jt/subprocess-handshake later to maint).
   (merge 0ba9c9a0fb jb/t8008-cleanup later to maint).
   (merge a7c28a2161 jt/t1450-fsck-corrupt-packfile later to maint).