Use shorter fs label for EFI partition to not break with recent dosfstools

This used to work fine until dosfstools 4.1:

| root@grml ~ # mkfs.fat -F32 -n "EFI System Partition" /dev/loop1
| mkfs.fat 4.1 (2017-01-24)
| mkfs.fat: warning - lowercase labels might not work properly with DOS or Windows

Now with dosfstools >=4.2 it's failing though:

| root@grml ~ # mkfs.fat -F32 -n "EFI System Partition" /dev/loop1
| mkfs.fat 4.2 (2021-01-31)
| mkfs.fat: Label can be no longer than 11 characters

So instead use "EFI" as filesystem label, to not fail with newer dosfstools.

Closes: #987014
Closes: grml/grml-debootstrap#168

diff --git a/grml-debootstrap b/grml-debootstrap
index 586edd8..d62cd2c 100755 (executable)
--- a/grml-debootstrap
+++ b/grml-debootstrap
@@ -980,7 +980,7 @@ format_efi_partition() {
     einfo "EFI partition $EFI seems to have a FAT filesystem, not modifying." ; eend 0
   else
     einfo "EFI partition $EFI doesn't seem to be formatted, creating filesystem."
-    mkfs.fat -F32 -n "EFI System Partition" "$EFI"
+    mkfs.fat -F32 -n "EFI" "$EFI"
     RC=$?
     if [ $RC -eq 0 ] ; then
       eend 0