$ arc patch D123
$ git add .
$ git commit -am "update"
$ arc diff --update D123
$ arc land --revision D123
Update diff to master
$ git checkout master
$ git merge arcpatch-D123
$ git push
Make a diff from current working branch
$ git add.
$ git commit -am "update"
$ arc diff --update D123
Push to working branch without land
$ git add .
$ git commit -am "update"
$ git push origin lol-branch
Make a diff from working branch from the first update
$ git checkout lol-branch
$ git add.
$ git commit -am "update"
$ arc diff master