proxmox-boot: return empty if file does not exist in get_first_line

makes using this helper shorter in most cases

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Reviewed-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Tested-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/proxmox-boot/functions b/proxmox-boot/functions
index 4515a2d9139cf53e5e947678e06de655e85b3cda..27da363ad255fce6ebf9df9d2aa37c119eb601cd 100755 (executable)
--- a/proxmox-boot/functions
+++ b/proxmox-boot/functions
@@ -104,6 +104,11 @@ loop_esp_list() {
 
 get_first_line() {
        file="$1"
+       if [ ! -e  "$file" ]; then
+           echo ""
+           return
+       fi
+
        while IFS= read -r line || [ -n "$line" ]; do
                break
        done < "${file}"