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由 Eric Blake 提交于
"virsh connect ''" should try to connect to the default connection, but the previous patch made it issue a warning about an invalid URI. * tools/virsh.c (VSH_OFLAG_EMPTY_OK): New option flag. (vshCommandOptString): Per the declaration, value is required to be non-NULL. Honor new flag. (opts_connect): Allow empty string connection.
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