v3.6

hi @earthlng, some small additions that 'might' help with [#1587](https://github.com/arkenfox/user.js/issues/1587)). Thank you.

in version 3.5 if you run updater.sh with sudo then: (1) user.js may only be readable by root and not load for the Firefox user (2) if the script is run first time with sudo, then again without sudo, permissions from the previous run may cause issues (eg no backup or update of user.js) with little or no warning.

Therefore v3.6 to: (1) set some file/dir permissions (on those created) if run with sudo (2) show info if some access permissions are not as expected (3) added some further error messages

updater.sh

@@ -2,7 +2,7 @@
 
 ## arkenfox user.js updater for macOS and Linux
 
-## version: 3.5
+## version: 3.6
 ## Author: Pat Johnson (@overdodactyl)
 ## Additional contributors: @earthlng, @ema-pe, @claustromaniac, @infinitewarp
 
@@ -202,6 +202,7 @@ update_updater() {
   fi
   mv "${tmpfile}" "$SCRIPT_FILE"
   chmod u+x "$SCRIPT_FILE"
+  chmod go+rx "$SCRIPT_FILE"
   "$SCRIPT_FILE" "$@" -d
   exit 0
 }
@@ -218,9 +219,13 @@ get_userjs_version() {
 add_override() {
   input=$1
   if [ -f "$input" ]; then
-    echo "" >> user.js
+    echo "" >> user.js 2>/dev/null
     cat "$input" >> user.js
-    echo -e "Status: ${GREEN}Override file appended:${NC} ${input}"
+    if [ $? -eq 0 ]; then
+      echo -e "Status: ${GREEN}Override file appended:${NC} ${input}"
+    else
+      echo -e "${RED}Error: Override file not appended:${NC} ${input}"
+    fi
   elif [ -d "$input" ]; then
     SAVEIFS=$IFS
     IFS=$'\n\b' # Set IFS
@@ -239,6 +244,39 @@ remove_comments() { # expects 2 arguments: from-file and to-file
   sed -e '/^\/\*.*\*\/[[:space:]]*$/d' -e '/^\/\*/,/\*\//d' -e 's|^[[:space:]]*//.*$||' -e '/^[[:space:]]*$/d' -e 's|);[[:space:]]*//.*|);|' "$1" > "$2"
 }
 
+show_additional_info_for_update_userjs() {
+  # dirs needing rwx
+  for entry in "$(pwd)" userjs_backups userjs_diffs; do
+    if [ -e "${entry}" ]; then
+      if [ ! -d "${entry}" ] || [ ! -r "${entry}" ] || [ ! -w "${entry}" ] || [ ! -x "${entry}" ]; then
+        echo -e "    ${ORANGE}Cannot access (rwx) directory:${NC} ${entry}"
+      fi
+    fi
+  done
+  # files needing rw
+  for entry in user.js; do
+    if [ -e "${entry}" ]; then
+      if [ ! -f "${entry}" ] || [ ! -r "${entry}" ] || [ ! -w "${entry}" ]; then
+        echo -e "    ${ORANGE}Cannot access (rw) file:${NC} ${entry}"
+      fi
+    fi
+  done
+  # files needing r
+  for entry in user-overrides.js; do
+    if [ -e "${entry}" ]; then
+      if [ ! -f "${entry}" ] || [ ! -r "${entry}" ]; then
+        echo -e "    ${ORANGE}Cannot access (r) file:${NC} ${entry}"
+      fi
+    fi
+  done
+  # no prefs.js
+  for entry in prefs.js; do
+    if [ ! -e "${entry}" ]; then
+      echo -e "    ${ORANGE}Profile location does not contain:${NC} ${entry}"
+    fi
+  done
+}
+
 # Applies latest version of user.js and any custom overrides
 update_userjs() {
   declare -r newfile="$(download_file 'https://raw.githubusercontent.com/arkenfox/user.js/master/user.js')"
@@ -247,7 +285,9 @@ update_userjs() {
   echo -e "Please observe the following information:
     Firefox profile:  ${ORANGE}$(pwd)${NC}
     Available online: ${ORANGE}$(get_userjs_version "$newfile")${NC}
-    Currently using:  ${ORANGE}$(get_userjs_version user.js)${NC}\n\n"
+    Currently using:  ${ORANGE}$(get_userjs_version user.js)${NC}"
+  show_additional_info_for_update_userjs
+  echo -e "\n"
 
   if [ "$CONFIRM" = 'yes' ]; then
     echo -e "This script will update to the latest user.js file and append any custom configurations from user-overrides.js. ${RED}Continue Y/N? ${NC}"
@@ -263,17 +303,32 @@ update_userjs() {
   # Copy a version of user.js to diffs folder for later comparison
   if [ "$COMPARE" = true ]; then
     mkdir -p userjs_diffs
-    cp user.js userjs_diffs/past_user.js &>/dev/null
+    [ -n "$SUDO_COMMAND" ] && chmod ugo+rwx userjs_diffs
+    cp user.js userjs_diffs/past_user.js
   fi
 
   # backup user.js
   mkdir -p userjs_backups
+  [ -n "$SUDO_COMMAND" ] && chmod ugo+rwx userjs_backups
   local bakname="userjs_backups/user.js.backup.$(date +"%Y-%m-%d_%H%M")"
   [ "$BACKUP" = 'single' ] && bakname='userjs_backups/user.js.backup'
-  cp user.js "$bakname" &>/dev/null
+  if [ -f user.js ]; then
+    cp user.js "$bakname"
+    if [ $? -eq 0 ] && [ -f "${bakname}" ]; then
+      echo -e "Status: ${GREEN}user.js has been backed up.${NC}"
+    else
+      echo -e "${RED}Error: user.js was not backed up.${NC}"
+    fi
+  else
+    echo -e "Status: ${GREEN}no existing user.js to back up.${NC}"
+  fi
 
-  mv "${newfile}" user.js
-  echo -e "Status: ${GREEN}user.js has been backed up and replaced with the latest version!${NC}"
+  mv -f "${newfile}" user.js
+  if [ $? -eq 0 ] && [ ! -f "${newfile}" ]; then
+    echo -e "Status: ${GREEN}user.js has been replaced with the latest version!${NC}"
+  else
+    echo -e "${RED}Error: user.js was not replaced with the latest version.${NC}"
+  fi
 
   if [ "$ESR" = true ]; then
     sed -e 's/\/\* \(ESR[0-9]\{2,\}\.x still uses all.*\)/\/\/ \1/' user.js > user.js.tmp && mv user.js.tmp user.js
@@ -310,6 +365,11 @@ update_userjs() {
     rm "$past_nocomments" "$current_nocomments" "$pastuserjs" &>/dev/null
   fi
 
+  # if run using sudo - ensure user.js has read permissions
+  [ -n "$SUDO_COMMAND" ] && chmod ugo+r user.js
+
+  echo
+
   [ "$VIEW" = true ] && open_file "${PWD}/user.js"
 }