deployment - Git command to checkout any branch and overwrite local changes -

is there git command (or short sequence of commands) safely , surely following:

currently i'm stuck with:

git fetch -p git stash git stash drop git checkout $branch git pull

but it's bothering me because i'm asked password 2 times (by fetch , pull). generally happy solution long password needed once.

a couple of notes:

it's part of homebrewed deployment script application (the code hosted on github),
there should no difference if branch fetched origin or not (i.e. first deployment of new branch shouldn't ideally require additional steps),
the script located on remote machine can accessed several people, hence no credentials stored , user/password must entered (but once if possible),
i don't care local changes, want pristine copy of given branch (the further part of deployment script produces local changes),
i can't clone or export fresh repository each time, takes time.

git fetch --all git reset --hard origin/abranch git checkout $branch

that involve 1 fetch.

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