From f75fb46b8001fa0e00160cf45fa44e0cb4d54241 Mon Sep 17 00:00:00 2001
From: Krzesimir Nowak <krzesimir@kinvolk.io>
Date: Thu, 3 Sep 2020 22:17:04 +0200
Subject: [PATCH] sys-kernel/coreos-sources: Add a script for sorting configs

The script sorts the lines in the config files and prints a messages
when some variable is being overridden (means that it is specified
twice in the config).

The script can be also used to check for such situations with full
configs like:

    cat commonconfig-* amd64_defconfig-* >amd64fullconfig
    ./sort_config.sh amd64fullconfig
    rm amd64fullconfig
---
 .../coreos-modules/files/sort_config.sh       | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100755 sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-modules/files/sort_config.sh

diff --git a/sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-modules/files/sort_config.sh b/sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-modules/files/sort_config.sh
new file mode 100755
index 0000000000..462097cee8
--- /dev/null
+++ b/sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-modules/files/sort_config.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# This script sorts the config files. It can be called with several
+# config files too, so it will sort each file separately.
+
+set -euo pipefail
+
+c_locale_sort()
+{
+    LC_ALL=C sort "${@}"
+}
+
+for cfgfile in "${@}"
+do
+    mapfile -t lines <"${cfgfile}"
+    declare -A variables # a hash map
+    for line in "${lines[@]}"
+    do
+        var="${line%%=*}"
+        var="${var#\# }"
+        var="${var%% *}"
+        if [[ ${variables[${var}]+isset} ]]
+        then
+            echo "${cfgfile}: overriding ${var}"
+        else
+            variables[${var}]=1
+            declare -a "LINES_FOR_${var}"
+        fi
+        declare -n var_lines="LINES_FOR_${var}"
+        var_lines+=("${line}")
+        unset -n var_lines
+    done
+    mapfile -t sorted_variables < <(printf '%s\n' "${!variables[@]}" | c_locale_sort)
+    truncate --size=0 "${cfgfile}"
+    for var in "${sorted_variables[@]}"
+    do
+        declare -n var_lines="LINES_FOR_${var}"
+        printf '%s\n' "${var_lines[@]}" >>"${cfgfile}"
+        unset var_lines
+        unset -n var_lines
+    done
+    unset sorted_variables
+    unset lines
+    unset variables
+done