merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

1 files changed, 64 insertions, 0 deletions

diff --git a/third_party/git/Documentation/RelNotes/2.12.3.txt b/third_party/git/Documentation/RelNotes/2.12.3.txt
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+Git v2.12.3 Release Notes
+=========================
+
+Fixes since v2.12.2
+-------------------
+
+ * The "parse_config_key()" API function has been cleaned up.
+
+ * An helper function to make it easier to append the result from
+   real_path() to a strbuf has been added.
+
+ * The t/perf performance test suite was not prepared to test not so
+   old versions of Git, but now it covers versions of Git that are not
+   so ancient.
+
+ * Picking two versions of Git and running tests to make sure the
+   older one and the newer one interoperate happily has now become
+   possible.
+
+ * Teach the "debug" helper used in the test framework that allows a
+   command to run under "gdb" to make the session interactive.
+
+ * "git repack --depth=<n>" for a long time busted the specified depth
+   when reusing delta from existing packs.  This has been corrected.
+
+ * user.email that consists of only cruft chars should consistently
+   error out, but didn't.
+
+ * A few tests were run conditionally under (rare) conditions where
+   they cannot be run (like running cvs tests under 'root' account).
+
+ * "git branch @" created refs/heads/@ as a branch, and in general the
+   code that handled @{-1} and @{upstream} was a bit too loose in
+   disambiguating.
+
+ * "git fetch" that requests a commit by object name, when the other
+   side does not allow such an request, failed without much
+   explanation.
+
+ * "git filter-branch --prune-empty" drops a single-parent commit that
+   becomes a no-op, but did not drop a root commit whose tree is empty.
+
+ * Recent versions of Git treats http alternates (used in dumb http
+   transport) just like HTTP redirects and requires the client to
+   enable following it, due to security concerns.  But we forgot to
+   give a warning when we decide not to honor the alternates.
+
+ * NO_PTHREADS build has been broken for some time; now fixed.
+
+ * Fix for potential segv introduced in v2.11.0 and later (also
+   v2.10.2).
+
+ * A few unterminated here documents in tests were fixed, which in
+   turn revealed incorrect expectations the tests make. These tests
+   have been updated.
+
+ * "git-shell" rejects a request to serve a repository whose name
+   begins with a dash, which makes it no longer possible to get it
+   confused into spawning service programs like "git-upload-pack" with
+   an option like "--help", which in turn would spawn an interactive
+   pager, instead of working with the repository user asked to access
+   (i.e. the one whose name is "--help").
+
+Also contains various documentation updates and code clean-ups.