option old data in `.git/FETCH_HEAD` will be overwritten.
-f, \--force::
+ When `git-fetch` is used with `<rbranch>:<lbranch>`
+ refspec, it refuses to update the local branch
+ `<lbranch>` unless the remote branch `<rbranch>` it
+ fetches is a descendant of `<lbranch>`. This option
+ overrides that check.
-t, \--tags::
+ By default, the git core utilities will not fetch and store
+ tags under the same name as the remote repository; ask it
+ to do so using `--tags`. Using this option will bound the
+ list of objects pulled to the remote tags. Commits in branches
+ beyond the tags will be ignored.
-u, \--update-head-ok::
By default `git-fetch` refuses to update the head which