pve-efiboot-tool: add and use list file helpers

in preparation of adding another file for custom kernels with the same semantics

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

bin/pve-efiboot-tool

@@ -4,6 +4,35 @@ set -e
 
 . /usr/share/pve-kernel-helper/scripts/functions
 
+_add_entry_to_list_file() {
+	file="$1"
+	entry="$2"
+
+	if [ -e "$file" ]; then
+		cp "$file" "$file.new"
+	fi
+	echo "$entry" >> "$file.new"
+	sort -uo "$file.new" "$file.new"
+	mv "$file.new" "$file"
+}
+
+_remove_entry_from_list_file() {
+	file="$1"
+	entry="$2"
+
+	# guard against removing whole file by accident!
+	if [ -z "$entry" ]; then
+		echo "cannot remove empty entry from '$file'."
+		return
+	fi
+
+	if [ -e "$file" ]; then
+		grep -vFx "$entry" "$file" > "$file.new" || true
+		mv "$file.new" "$file"
+	else
+		echo "'$file' does not exist.."
+	fi
+}
 
 _get_partition_info() {
 	if [ ! -e "$1" ]; then
@@ -130,12 +159,7 @@ init() {
 	umount "$part"
 
 	echo "Adding '$part' to list of synced ESPs.."
-	if [ -e "$ESP_LIST" ]; then
+	_add_entry_to_list_file "$ESP_LIST" "$UUID"
-		cp "$ESP_LIST" "$ESP_LIST.new"
-	fi
-	echo "$UUID" >> "$ESP_LIST.new"
-	sort -uo "$ESP_LIST.new" "$ESP_LIST.new"
-	mv "$ESP_LIST.new" "$ESP_LIST"
 
 	echo "Refreshing kernels and initrds.."
 	refresh