repo.get returns mirror{tracking,url,state,acceptWrites,...} and detachedFrom. mirror.detach replaces mirror.delete and keeps the upstream as provenance; mirror.writes opts a mirror into local writes. Pushes, tickets, wiki, forum and technotes on a tracking mirror are refused (403) naming the upstream. A URL change clears failures recorded against the old peer. check-in: d980bf4d71 user: dmestas tags: mirror-posture