Make shell script POSIX-complaint

Make various updates to shell script toensure POSIX-compliant by removing bash specific syntax

Author: satnam72

codeserver/ubi9-python-3.12/nginx/root/usr/share/container-scripts/nginx/common.sh

@@ -1,8 +1,7 @@
 #!/bin/sh
 
 # get_matched_files finds file for image extending
-function get_matched_files() {
-  local custom_dir default_dir
+get_matched_files() {
   custom_dir="$1"
   default_dir="$2"
   files_matched="$3"
@@ -13,19 +12,17 @@ function get_matched_files() {
 # process_extending_files process extending files in $1 and $2 directories
 # - source all *.sh files
 #   (if there are files with same name source only file from $1)
-function process_extending_files() {
-  local custom_dir default_dir
+process_extending_files() {
   custom_dir=$1
   default_dir=$2
-  while read filename ; do
-    if [ $filename ]; then
-      echo "=> sourcing $filename ..."
-      # Custom file is prefered
-      if [ -f $custom_dir/$filename ]; then
-        source $custom_dir/$filename
-      elif [ -f $default_dir/$filename ]; then 
-        source $default_dir/$filename
-      fi
+ get_matched_files "$custom_dir" "$default_dir" '*.sh' | sort -u | while read -r filename; do
+  if [ "$filename" ]; then
+    echo "=> sourcing $filename ..."
+    if [ -f "$custom_dir/$filename" ]; then
+      . "$custom_dir/$filename"
+    elif [ -f "$default_dir/$filename" ]; then 
+      . "$default_dir/$filename"
     fi
-  done <<<"$(get_matched_files "$custom_dir" "$default_dir" '*.sh' | sort -u)"
+  fi
+done
 }