[Bug 1937319] Re: namespace collision on url kernel arg results in downloading iso multiple times

[Michael Hudson-Doyle]

I had a look at the code that does this download and the structure of
the APIs used looks to make this kind of sniffing a bit awkward :(
Nothing impossible of course but it's not going to be completely trivial
either.

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https://bugs.launchpad.net/bugs/1937319

Title:
  namespace collision on url kernel arg results in downloading iso
  multiple times

Status in cloud-init:
  Triaged
Status in casper package in Ubuntu:
  New

Bug description:
  As listed at https://discourse.ubuntu.com/t/netbooting-the-live-
  server-installer/14510/135

  When attempting a netboot, we can end up in a situation where cloud-
  init downloads a full iso, only to decide that the first few bytes
  aren't the expected header and to ignore it.

  I suggest an enhancement where a small amount of data is downloaded at
  first, we check this data for the required #cloud-config, and then use
  that info to decide to continue to download the file or not.

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