origin/name-of-upstream-branch, which you can see using
`git branch -r`.
+[[def_overlay]]overlay::
+ Only update and add files to the working directory, but don't
+ delete them, similar to how 'cp -R' would update the contents
+ in the destination directory. This is the default mode in a
+ <<def_checkout,checkout>> when checking out files from the
+ <<def_index,index>> or a <<def_tree-ish,tree-ish>>. In
+ contrast, no-overlay mode also deletes tracked files not
+ present in the source, similar to 'rsync --delete'.
+
[[def_pack]]pack::
A set of objects which have been compressed into one file (to save space
or to transmit them efficiently).