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If the user sets the sbt.boot.credentials system property or the SBTCREDENTIALS_ environment variable, then that file gets parsed for a realm, hostname, username and password which is added to the CredentialsStore static instance.
IMPORTANT This project has moved to https://github.com/sbt/sbt. This issue still exists to avoid dead links, but GitHub limitations prevent the original issue from being correctly preserved here. Please see sbt/sbt#196 for the full issue and to comment.