[Bug 1384955] Re: flash-kernel should support compressed kernels

[dann frazier]

One comment on the patch - it adds a new dependency on the "file"
package. So, if this method is used, then we'll also need to add it to
debian/control.

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Title:
  flash-kernel should support compressed kernels

Status in “flash-kernel” package in Ubuntu:
  New

Bug description:
  When building an upstream kernel using "make deb-pkg" and not any of
  the Ubuntu-specific kernel build methods (such as debian/rules binary-
  headers binary-generic), the resulting linux-image deb package
  includes a gzip-compressed kernel image (copied from Image.gz, not
  Image). When such a deb package is installed on an arm64 system (such
  as McDivitt) and flash-kernel is run, it always calls "mkimage" with
  "-C none", which results in a uImage that can't boot.

  The attached patch adds a check to the mkimage_kernel() function in
  /usr/share/flash-kernel/functions to determine whether the kernel
  image is gzip-compressed or not, and calls "mkimage" with the
  appropriate "-C gzip" or "-C none" option. I have tested this patch on
  McDivitt, with both standard Ubuntu 3.13.0-37 and upstream 3.18-rc1
  kernels, and it works for me.

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