api: remove_repofile_if_unused align closer to deb822 spec

api

@@ -256,8 +256,9 @@ remove_repofile_if_unused() { #Given a sources.list.d file, delete it if nothing
       local IFS=$'\n'
     done
   elif [ "${file##*.}" == "sources" ]; then
-    #find empty lines in the file that separate stanzas
-    local empty_lines="$(grep -n '^$' "$file" | awk '{print $1}' | sed 's/:*//g')"
+    #find empty lines (empty line, line with all spaces, or line with all tabs) in the file that separate stanzas. empty lines are not allowed between fields within a stanza
+    #https://manpages.ubuntu.com/manpages/jammy/en/man5/deb822.5.html
+    local empty_lines="$(grep -P -n '^$|^ +$|^\t+$' "$file" | awk '{print $1}' | sed 's/:*//g')"
     #get number of lines in file
     local num_lines=$(wc -l "$file" | awk '{print $1}')
 
@@ -277,9 +278,10 @@ remove_repofile_if_unused() { #Given a sources.list.d file, delete it if nothing
       sed -n "$line_start","$line_end"p  "$file" | grep -q '^Enabled: no' && continue
       # determine what uri, suite, and components are in a file
       #each stanza can only have one matching section. if there are multiple matches the last one is used
-      local uri="$(sed -n "$line_start","$line_end"p  "$file" | grep -v '^#' | grep '^URIs: ' | sed 's/URIs: //g' | tail -1)"
-      local suites="$(sed -n "$line_start","$line_end"p "$file" | grep -v '^#' | grep '^Suites: ' | sed 's/Suites: //g' | tail -1)"
-      local components="$(sed -n "$line_start","$line_end"p "$file" | grep -v '^#' | grep '^Components: ' | sed 's/Components: //g' | tail -1)"
+      #case should be ignored for fields
+      local uri="$(sed -n "$line_start","$line_end"p  "$file" | grep -v '^#' | grep -i '^URIs: ' | sed 's/URIs: //Ig' | tail -1)"
+      local suites="$(sed -n "$line_start","$line_end"p "$file" | grep -v '^#' | grep -i '^Suites: ' | sed 's/Suites: //Ig' | tail -1)"
+      local components="$(sed -n "$line_start","$line_end"p "$file" | grep -v '^#' | grep -i '^Components: ' | sed 's/Components: //Ig' | tail -1)"
       local IFS=' '
       for suite in $suites ;do
         if [ -z "$components" ]; then