Now that we have a dynamic TFTP server serving pxelinux configurations, how about embedding the current time in the kernel command line?
Like: it_is_after=1344241395. Very early in the boot, if it_is_after is supplied, check the hardware clock and if it is before the time specified then bump it to that time. This definitely can't make the situation worse, as any hardware clock before it_is_after is definitely wrong. We're only supplying guaranteed truth that cannot be wrong. This will bring the clock close enough for auth, and ntp can kick in at a later time for greater accuracy later. I don't think this is as ugly as it first seems in a world where instances are ephemeral and need to bootstrap the clock on boot more often than not. I think that overloading use of the command line is justified here because it is necessary for communication to get further configuration. It should also be pretty trivial to implement. Robie
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