prepush: print short hash of first new head in abort message and don't mention the branch if it's the default branch. OLD: $ hg push ../a pushing to ../a searching for changes abort: push creates new remote heads on branch 'default'! (you should pull and merge or use push -f to force) NEW: $ hg push ../a pushing to ../a searching for changes abort: push creates new remote head 1e108cc5548c! (you should pull and merge or use push -f to force) This helps to identify which local head is causing troubles. See also change 91cb08a9e7fb.