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

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

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+git-init(1)
+===========
+
+NAME
+----
+git-init - Create an empty Git repository or reinitialize an existing one
+
+
+SYNOPSIS
+--------
+[verse]
+'git init' [-q | --quiet] [--bare] [--template=<template_directory>]
+	  [--separate-git-dir <git dir>]
+	  [--shared[=<permissions>]] [directory]
+
+
+DESCRIPTION
+-----------
+
+This command creates an empty Git repository - basically a `.git`
+directory with subdirectories for `objects`, `refs/heads`,
+`refs/tags`, and template files.  An initial `HEAD` file that
+references the HEAD of the master branch is also created.
+
+If the `$GIT_DIR` environment variable is set then it specifies a path
+to use instead of `./.git` for the base of the repository.
+
+If the object storage directory is specified via the
+`$GIT_OBJECT_DIRECTORY` environment variable then the sha1 directories
+are created underneath - otherwise the default `$GIT_DIR/objects`
+directory is used.
+
+Running 'git init' in an existing repository is safe. It will not
+overwrite things that are already there. The primary reason for
+rerunning 'git init' is to pick up newly added templates (or to move
+the repository to another place if --separate-git-dir is given).
+
+OPTIONS
+-------
+
+-q::
+--quiet::
+
+Only print error and warning messages; all other output will be suppressed.
+
+--bare::
+
+Create a bare repository. If `GIT_DIR` environment is not set, it is set to the
+current working directory.
+
+--template=<template_directory>::
+
+Specify the directory from which templates will be used.  (See the "TEMPLATE
+DIRECTORY" section below.)
+
+--separate-git-dir=<git dir>::
+
+Instead of initializing the repository as a directory to either `$GIT_DIR` or
+`./.git/`, create a text file there containing the path to the actual
+repository.  This file acts as filesystem-agnostic Git symbolic link to the
+repository.
++
+If this is reinitialization, the repository will be moved to the specified path.
+
+--shared[=(false|true|umask|group|all|world|everybody|0xxx)]::
+
+Specify that the Git repository is to be shared amongst several users.  This
+allows users belonging to the same group to push into that
+repository.  When specified, the config variable "core.sharedRepository" is
+set so that files and directories under `$GIT_DIR` are created with the
+requested permissions.  When not specified, Git will use permissions reported
+by umask(2).
++
+The option can have the following values, defaulting to 'group' if no value
+is given:
++
+--
+'umask' (or 'false')::
+
+Use permissions reported by umask(2). The default, when `--shared` is not
+specified.
+
+'group' (or 'true')::
+
+Make the repository group-writable, (and g+sx, since the git group may be not
+the primary group of all users). This is used to loosen the permissions of an
+otherwise safe umask(2) value. Note that the umask still applies to the other
+permission bits (e.g. if umask is '0022', using 'group' will not remove read
+privileges from other (non-group) users). See '0xxx' for how to exactly specify
+the repository permissions.
+
+'all' (or 'world' or 'everybody')::
+
+Same as 'group', but make the repository readable by all users.
+
+'0xxx'::
+
+'0xxx' is an octal number and each file will have mode '0xxx'. '0xxx' will
+override users' umask(2) value (and not only loosen permissions as 'group' and
+'all' does). '0640' will create a repository which is group-readable, but not
+group-writable or accessible to others. '0660' will create a repo that is
+readable and writable to the current user and group, but inaccessible to others.
+--
+
+By default, the configuration flag `receive.denyNonFastForwards` is enabled
+in shared repositories, so that you cannot force a non fast-forwarding push
+into it.
+
+If you provide a 'directory', the command is run inside it. If this directory
+does not exist, it will be created.
+
+TEMPLATE DIRECTORY
+------------------
+
+Files and directories in the template directory whose name do not start with a
+dot will be copied to the `$GIT_DIR` after it is created.
+
+The template directory will be one of the following (in order):
+
+ - the argument given with the `--template` option;
+
+ - the contents of the `$GIT_TEMPLATE_DIR` environment variable;
+
+ - the `init.templateDir` configuration variable; or
+
+ - the default template directory: `/usr/share/git-core/templates`.
+
+The default template directory includes some directory structure, suggested
+"exclude patterns" (see linkgit:gitignore[5]), and sample hook files.
+
+The sample hooks are all disabled by default. To enable one of the
+sample hooks rename it by removing its `.sample` suffix.
+
+See linkgit:githooks[5] for more general info on hook execution.
+
+EXAMPLES
+--------
+
+Start a new Git repository for an existing code base::
++
+----------------
+$ cd /path/to/my/codebase
+$ git init      <1>
+$ git add .     <2>
+$ git commit    <3>
+----------------
++
+<1> Create a /path/to/my/codebase/.git directory.
+<2> Add all existing files to the index.
+<3> Record the pristine state as the first commit in the history.
+
+GIT
+---
+Part of the linkgit:git[1] suite