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[svn]共有のアカウントでログインしてもSVN CIは別のアカウントにする方法。

svnはユーザー名と、パスワードをキャッシュしてくれるのだけれど、それをやめさせればいい。
~/.subversion/config
のstore-passwordsとstore-auth-credsをnoにすればよさげ

  6 ### Section for authentication and authorization customizations.
  7 [auth]
  8 ### Set store-passwords to 'no' to avoid storing passwords in the
  9 ### auth/ area of your config directory.  It defaults to 'yes'.
 10 ### Note that this option only prevents saving of *new* passwords;
 11 ### it doesn't invalidate existing passwords.  (To do that, remove
 12 ### the cache files by hand as described in the Subversion book.)
 13 store-passwords = no
 14 ### Set store-auth-creds to 'no' to avoid storing any subversion
 15 ### credentials in the auth/ area of your config directory.
 16 ### It defaults to 'yes'.  Note that this option only prevents
 17 ### saving of *new* credentials;  it doesn't invalidate existing
 18 ### caches.  (To do that, remove the cache files by hand.)
 19 store-auth-creds = no