bug script: Check for unreadable /e/n/interfaces files

debian/changelog

@@ -191,6 +191,7 @@ linux (5.2.9-1) UNRELEASED; urgency=medium
   * ptp: Change CAVIUM_PTP from built-in to modular (Closes: #934848)
   * bug script: Check whether /e/n/interfaces exists (Closes: #934824)
   * bug script: Include network configuration from /e/n/interfaces.d
+  * bug script: Check for unreadable /e/n/interfaces files
 
  -- Salvatore Bonaccorso <carnil@debian.org>  Sun, 11 Aug 2019 14:14:00 +0200
 

debian/templates/image.bug/include-network

@@ -21,6 +21,11 @@ _add_etc_network_interfaces() {
   echo '** Network interface configuration:' >&3
 
   while read file; do
+    if ! [ -r "$file" ]; then
+      echo "*** $file: unreadable" >&3
+      echo >&3
+      continue
+    fi
     echo "*** $file:" >&3
     # Hide passwords/keys
     awk '$1 ~ /key|pass|^wpa-(anonymous|identity|phase|pin|private|psk)/ { gsub(".", "*", $2); }