Add git fetch command to pull changes from the fork before setting local repo to track origin/master

[bytrangle]

When I attempted to set up my local master branch to track the personal copy origin/master at my fork with the command:

git branch --set-upstream-to origin/master

I got an error “The requested upstream branch 'origin/master' does not exist”.

I believe the reason is that we haven't made a local copy of the branch named master on the remote named origin.

To see all the branches associated with the repo, run git branch -a. The output is as followed:

* master
  remotes/upstream/HEAD -> upstream/master
  remotes/upstream/exercise10
  remotes/upstream/exercise2
  remotes/upstream/exercise3
  remotes/upstream/exercise4
  remotes/upstream/exercise5
  remotes/upstream/exercise6
  remotes/upstream/exercise7
  remotes/upstream/exercise9
  remotes/upstream/master

Git is not aware of any origin/master branch at this point.

If I run either of these two commands: git fetch origin, or git push -u origin master, then run git branch -a again, the output is the same as above, but including an extra line: remotes/origin/master.

Then run git branch --set-upstream-to origin/master, then it works as expected with the message: “Branch 'master' set up to track remote branch 'master' from 'origin'.”

Hence, I propose that in the Solution section for exercise 8, we add the git fetch command before git branch --set-upstream-to so that other learns who follow it won't be caught off guard.