kernel: Print unified diff if kernel config does not match
After 'make oldconfig' we check that that the kernel config
is as we expect and error if they don't. We used to print
the default 'diff' output on a mismatch but a unified diff
is easier to read.
@@ -112,7 +112,7 @@ RUN case $(uname -m) in \
fi && \
make defconfig && \
make oldconfig && \
- if [ -z "${EXTRA}" ] && [ -z "${DEBUG}" ]; then diff .config ${KERNEL_DEF_CONF}; fi
+ if [ -z "${EXTRA}" ] && [ -z "${DEBUG}" ]; then diff -u .config ${KERNEL_DEF_CONF}; fi
# Kernel
