Use right command for determining current branch

deploy.sh

@@ -23,7 +23,7 @@ fi
 
 # TODO: When deployment is new enough, use the top command.
 #currentbranch="$(git branch --show-current)"
-currentbranch="$(git branch --format '%(refname:short)')"
+currentbranch="$(git rev-parse --abbrev-ref HEAD)"
 
 # If we are not on target branch, switch and run again
 if test "$currentbranch" '!=' "$branch"; then