glossary: Add definitions for dangling and unreachable objects

Define "dangling" and "unreachable" objects.  Modified from original
text proposed by Yasushi Shoji.

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/glossary.txt b/Documentation/glossary.txt
index d20eb6270cd795ab61b281154a7e24070519b7fb..9f446241e2dabee4b93f5c1625351f2260e73717 100644 (file)
--- a/Documentation/glossary.txt
+++ b/Documentation/glossary.txt
@@ -73,6 +73,11 @@ DAG::
        objects is acyclic (there is no chain which begins and ends with the
        same object).
 
+dangling object::
+       An unreachable object which is not reachable even from other
+       unreachable objects; a dangling object has no references to it
+       from any reference or object in the repository.
+
 dircache::
        You are *waaaaay* behind.
 
@@ -350,6 +355,10 @@ tag::
 unmerged index::
        An index which contains unmerged index entries.
 
+unreachable object::
+       An object which is not reachable from a branch, tag, or any
+       other reference.
+
 working tree::
        The set of files and directories currently being worked on,
        i.e. you can work in your working tree without using git at all.