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20cfa2af2c
This was missed when things were renamed. The intention with this code was (apparently) to provide a (pseudo)unique hostname in the case where something more specific was not provided (e.g. by DHCP). Make this a little clearer by using '(none)' rather than 'linuxkit' as the default, in the normal case this will be overwritten by something more specific and if it isn't we will change it to something somewhat unique derived from the MAC address (as before). nb: '(none)' is already used by Debian so I think it is a safe choice as the sentinel value. The use of both CONFIG_DEFAULT_HOSTNAME and the explicit /etc/hostname from mkimage.sh is likely to be redundant in some cases, but neither seems to completely cover all cases so keep both. Signed-off-by: Ian Campbell <ian.campbell@docker.com>