SHA1, the date/time and the reason of the update, but
only when the file exists. If this configuration
variable is set to true, missing "$GIT_DIR/logs/<ref>"
- file is automatically created for branch heads.
+ file is automatically created for branch heads (i.e. under
+ refs/heads/), remote refs (i.e. under refs/remotes/),
+ note refs (i.e. under refs/notes/), and the symbolic ref HEAD.
+
This information can be used to determine what commit
was the tip of a branch "2 days ago".