Merge branch 'maint' of git://linux-nfs.org/~bfields/git into maint

* 'maint' of git://linux-nfs.org/~bfields/git:
  core-tutorial: minor cleanup
  documentation: replace Discussion section by link to user-manual chapter
  user-manual: todo updates and cleanup
  user-manual: fix introduction to packfiles
  user-manual: move packfile and dangling object discussion
  user-manual: rewrite object database discussion
  user-manual: reorder commit, blob, tree discussion
  user-manual: rewrite index discussion
  user-manual: create new "low-level git operations" chapter
  user-manual: rename "git internals" to "git concepts"
  user-manual: move object format details to hacking-git chapter
  user-manual: adjust section levels in "git internals"

1 files changed, 53 insertions, 4 deletions

diff --git a/Documentation/git.txt b/Documentation/git.txt
index 6f7db2935b..a7cd91acc1 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -134,9 +134,9 @@ FURTHER DOCUMENTATION
 See the references above to get started using git.  The following is
 probably more detail than necessary for a first-time user.
 
-The <<Discussion,Discussion>> section below and the
-link:core-tutorial.html[Core tutorial] both provide introductions to the
-underlying git architecture.
+The link:user-manual.html#git-concepts[git concepts chapter of the
+user-manual] and the link:core-tutorial.html[Core tutorial] both provide
+introductions to the underlying git architecture.
 
 See also the link:howto-index.html[howto] documents for some useful
 examples.
@@ -474,7 +474,56 @@ for further details.
 
 Discussion[[Discussion]]
 ------------------------
-include::core-intro.txt[]
+
+More detail on the following is available from the
+link:user-manual.html#git-concepts[git concepts chapter of the
+user-manual] and the link:core-tutorial.html[Core tutorial].
+
+A git project normally consists of a working directory with a ".git"
+subdirectory at the top level.  The .git directory contains, among other
+things, a compressed object database representing the complete history
+of the project, an "index" file which links that history to the current
+contents of the working tree, and named pointers into that history such
+as tags and branch heads.
+
+The object database contains objects of three main types: blobs, which
+hold file data; trees, which point to blobs and other trees to build up
+directory heirarchies; and commits, which each reference a single tree
+and some number of parent commits.
+
+The commit, equivalent to what other systems call a "changeset" or
+"version", represents a step in the project's history, and each parent
+represents an immediately preceding step.  Commits with more than one
+parent represent merges of independent lines of development.
+
+All objects are named by the SHA1 hash of their contents, normally
+written as a string of 40 hex digits.  Such names are globally unique.
+The entire history leading up to a commit can be vouched for by signing
+just that commit.  A fourth object type, the tag, is provided for this
+purpose.
+
+When first created, objects are stored in individual files, but for
+efficiency may later be compressed together into "pack files".
+
+Named pointers called refs mark interesting points in history.  A ref
+may contain the SHA1 name of an object or the name of another ref.  Refs
+with names beginning `ref/head/` contain the SHA1 name of the most
+recent commit (or "head") of a branch under developement.  SHA1 names of
+tags of interest are stored under `ref/tags/`.  A special ref named
+`HEAD` contains the name of the currently checked-out branch.
+
+The index file is initialized with a list of all paths and, for each
+path, a blob object and a set of attributes.  The blob object represents
+the contents of the file as of the head of the current branch.  The
+attributes (last modified time, size, etc.) are taken from the
+corresponding file in the working tree.  Subsequent changes to the
+working tree can be found by comparing these attributes.  The index may
+be updated with new content, and new commits may be created from the
+content stored in the index.
+
+The index is also capable of storing multiple entries (called "stages")
+for a given pathname.  These stages are used to hold the various
+unmerged version of a file when a merge is in progress.
 
 Authors
 -------