The Object Database

 
git is a content addressable filesystem
 each object named by a SHA-1 hash of contents
 blob, tree, commit, tag types
 
Playing with Objects
     $ ls .git/objects/??/*
       .git/objects/89/b4e86adcc34ffcd176df5fda4ffc90d01474c1
       ...
 
 (1) $ git-cat-file -t 89b4e86adcc34ffcd176df5fda4ffc90d01474c1
       blob
 (2) $ git-cat-file blob 89b4e86adcc34ffcd176df5fda4ffc90d01474c1
       <file contents>
 
 (1) find out the type of an object
 (2) print out the contents of the file