Rolf Neugebauer ffcf5db6ee kernel: Use local kernel source if available ...

The kernel build currently downloads the source tar ball every
time, which is a little tedious when experimenting with kernel
configs or when compiling the kernel multiple times.

This commit adds a new 'fetch' make target which downloads the
kernel sources into ./sources. Then in the Dockerfile we add
the directory and only download the source if it is not present.

The tarballs signature is till checked on each build.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>

2017-08-20 11:41:59 +01:00

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