You're right, using the --basedir option is not necessary. However in case of a TFTPDIR other than the defaults, you still have to perform ltsp-update-kernels manually as TFTPDIR is not an option for ltsp-build-client.
You're right, using the --basedir option is not necessary. However in case of a TFTPDIR other than the defaults, you still have to perform ltsp-update-kernels manually as TFTPDIR is not an option for ltsp-build-client.