commit:     588d9254f66d090e593033da2aa9a257d6e3bfce
Author:     Thomas Deutschmann <whissi <AT> gentoo <DOT> org>
AuthorDate: Fri Mar 19 02:35:50 2021 +0000
Commit:     Thomas Deutschmann <whissi <AT> gentoo <DOT> org>
CommitDate: Fri Mar 19 02:45:48 2021 +0000
URL:        https://gitweb.gentoo.org/proj/genkernel.git/commit/?id=588d9254

gen_configkernel.sh: config_kernel(): Warn when kernel config did not change

When user requests to modify kernel config, i.e. `genkernel --menuconfig`
but kernel config did not change, show a warning to allow user to notice.

This can happen for example when user loaded a different kernel config
in dialog but forgot to save to $KERNEL_OUTPUTDIR/.config which is
required in that case.

Link 1: https://forums.gentoo.org/viewtopic-p-8588232.html#8588232
Signed-off-by: Thomas Deutschmann <whissi <AT> gentoo.org>

 gen_configkernel.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gen_configkernel.sh b/gen_configkernel.sh
index 00eab73..bff3fdc 100755
--- a/gen_configkernel.sh
+++ b/gen_configkernel.sh
@@ -334,8 +334,17 @@ config_kernel() {
 
        if [ -n "${add_config}" ]
        then
+               local kconfig_md5sum_old="$(md5sum < 
"${KERNEL_OUTPUTDIR}/.config")"
+
                print_info 1 "$(get_indent 1)>> Invoking ${add_config} ..."
                compile_generic ${add_config} kernelruntask
+
+               local kconfig_md5sum_new="$(md5sum < 
"${KERNEL_OUTPUTDIR}/.config")"
+               if [[ "${kconfig_md5sum_old}" == "${kconfig_md5sum_new}" ]]
+               then
+                       print_warning 1 "$(get_indent 1)>> Kernel config was 
not modified!"
+               fi
+               unset kconfig_md5sum_old kconfig_md5sum_new
        fi
 
        local -a required_kernel_options

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