lib.sh: source additional files local_config.bash

Source additional files /etc/sof/local_config.bash and
sof-test/case-lib/local_config.bash.

This helps solving device-specific issues like #1233 and many others
before that - for instance git blame the "ignore_str" variable in
sof-kernel-log-check.sh

Signed-off-by: Marc Herbert <marc.herbert@intel.com>

Author: marc-hb

case-lib/config.sh

@@ -2,6 +2,10 @@
 
 # this file is used for defining global variables
 
+# To change some of these variables without polluting git status/git
+# diff, override them in either /etc/sof/local_config.bash or
+# sof-test/case-lib/local_config.bash
+
 # Some variables need manual configuration
 # Some commands need to access system node, so they need the sudo password
 SUDO_PASSWD=${SUDO_PASSWD:-}

case-lib/lib.sh

@@ -21,6 +21,15 @@ source "$SCRIPT_HOME/case-lib/pipeline.sh"
 # shellcheck source=case-lib/hijack.sh
 source "$SCRIPT_HOME/case-lib/hijack.sh"
 
+# source these last (and in this order) so they win
+for f in /etc/sof/local_config.bash ${SCRIPT_HOME}/case-lib/local_config.bash; do
+    if test -e "$f"; then
+        dlogw "Sourcing local and optional $f"
+        # shellcheck disable=SC1090
+        source "$f"
+    fi
+done
+
 # restrict bash version for some bash feature
 [[ $(echo -e "$BASH_VERSION\n4.1"|sort -V|head -n 1) == '4.1' ]] || {
     dlogw "Bash version: ${BASH_VERSINFO[0]}.${BASH_VERSINFO[1]} should > 4.1"