merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 3 insertions, 91 deletions

diff --git a/third_party/git/Documentation/git-rev-list.txt b/third_party/git/Documentation/git-rev-list.txt
index 9392760b2541..5da66232dc3f 100644
--- a/third_party/git/Documentation/git-rev-list.txt
+++ b/third_party/git/Documentation/git-rev-list.txt
@@ -9,101 +9,13 @@ git-rev-list - Lists commit objects in reverse chronological order
 SYNOPSIS
 --------
 [verse]
-'git rev-list' [ --max-count=<number> ]
-	     [ --skip=<number> ]
-	     [ --max-age=<timestamp> ]
-	     [ --min-age=<timestamp> ]
-	     [ --sparse ]
-	     [ --merges ]
-	     [ --no-merges ]
-	     [ --min-parents=<number> ]
-	     [ --no-min-parents ]
-	     [ --max-parents=<number> ]
-	     [ --no-max-parents ]
-	     [ --first-parent ]
-	     [ --remove-empty ]
-	     [ --full-history ]
-	     [ --not ]
-	     [ --all ]
-	     [ --branches[=<pattern>] ]
-	     [ --tags[=<pattern>] ]
-	     [ --remotes[=<pattern>] ]
-	     [ --glob=<glob-pattern> ]
-	     [ --ignore-missing ]
-	     [ --stdin ]
-	     [ --quiet ]
-	     [ --topo-order ]
-	     [ --parents ]
-	     [ --timestamp ]
-	     [ --left-right ]
-	     [ --left-only ]
-	     [ --right-only ]
-	     [ --cherry-mark ]
-	     [ --cherry-pick ]
-	     [ --encoding=<encoding> ]
-	     [ --(author|committer|grep)=<pattern> ]
-	     [ --regexp-ignore-case | -i ]
-	     [ --extended-regexp | -E ]
-	     [ --fixed-strings | -F ]
-	     [ --date=<format>]
-	     [ [ --objects | --objects-edge | --objects-edge-aggressive ]
-	       [ --unpacked ]
-	       [ --object-names | --no-object-names ]
-	       [ --filter=<filter-spec> [ --filter-print-omitted ] ] ]
-	     [ --missing=<missing-action> ]
-	     [ --pretty | --header ]
-	     [ --bisect ]
-	     [ --bisect-vars ]
-	     [ --bisect-all ]
-	     [ --merge ]
-	     [ --reverse ]
-	     [ --walk-reflogs ]
-	     [ --no-walk ] [ --do-walk ]
-	     [ --count ]
-	     [ --use-bitmap-index ]
-	     <commit>... [ \-- <paths>... ]
+'git rev-list' [<options>] <commit>... [[--] <path>...]
 
 DESCRIPTION
 -----------
 
-List commits that are reachable by following the `parent` links from the
-given commit(s), but exclude commits that are reachable from the one(s)
-given with a '{caret}' in front of them.  The output is given in reverse
-chronological order by default.
-
-You can think of this as a set operation.  Commits given on the command
-line form a set of commits that are reachable from any of them, and then
-commits reachable from any of the ones given with '{caret}' in front are
-subtracted from that set.  The remaining commits are what comes out in the
-command's output.  Various other options and paths parameters can be used
-to further limit the result.
-
-Thus, the following command:
-
------------------------------------------------------------------------
-	$ git rev-list foo bar ^baz
------------------------------------------------------------------------
-
-means "list all the commits which are reachable from 'foo' or 'bar', but
-not from 'baz'".
-
-A special notation "'<commit1>'..'<commit2>'" can be used as a
-short-hand for "{caret}'<commit1>' '<commit2>'". For example, either of
-the following may be used interchangeably:
-
------------------------------------------------------------------------
-	$ git rev-list origin..HEAD
-	$ git rev-list HEAD ^origin
------------------------------------------------------------------------
-
-Another special notation is "'<commit1>'...'<commit2>'" which is useful
-for merges.  The resulting set of commits is the symmetric difference
-between the two operands.  The following two commands are equivalent:
-
------------------------------------------------------------------------
-	$ git rev-list A B --not $(git merge-base --all A B)
-	$ git rev-list A...B
------------------------------------------------------------------------
+:git-rev-list: 1
+include::rev-list-description.txt[]
 
 'rev-list' is a very essential Git command, since it
 provides the ability to build and traverse commit ancestry graphs. For