Arch Linux mkinitcpio-dropbear patch for support copying ED25519 key from host

arch-dropbear.patch

--- dropbear.old	2024-07-08 08:56:16.334606650 +0900
+++ dropbear	2024-07-08 09:05:31.146341355 +0900
@@ -8,7 +8,7 @@
 display_fingerprints() {
   local keyfile
 
-  for keyfile in "/etc/dropbear/dropbear_rsa_host_key" "/etc/dropbear/dropbear_dss_host_key" "/etc/dropbear/dropbear_ecdsa_host_key" ; do
+  for keyfile in "/etc/dropbear/dropbear_rsa_host_key" "/etc/dropbear/dropbear_dss_host_key" "/etc/dropbear/dropbear_ecdsa_host_key" "/etc/dropbear/dropbear_ed25519_host_key" ; do
       if [ -s "${keyfile}" ] ; then
 	  echo "$(basename "${keyfile}") : $(get_fingerprint "${keyfile}")"
       fi
@@ -19,6 +19,7 @@
   local osshrsa="/etc/ssh/ssh_host_rsa_key"
   local osshdsa="/etc/ssh/ssh_host_dsa_key"
   local osshecdsa="/etc/ssh/ssh_host_ecdsa_key"
+  local osshed25519="/etc/ssh/ssh_host_ed25519_key"
 
   local dbpre="/etc/dropbear/dropbear_"
 
@@ -39,12 +40,17 @@
       return_code=0
   fi
 
+  if [ -s "$osshed25519" ]; then
+      dropbearconvert openssh dropbear $osshed25519 ${dbpre}ed25519_host_key
+      return_code=0
+  fi
+
   return $return_code
 }
 
 generate_keys() {
   local keyfile keytype
-  for keytype in rsa dss ecdsa ; do
+  for keytype in rsa dss ecdsa ed25519 ; do
       keyfile="/etc/dropbear/dropbear_${keytype}_host_key"
       if [ ! -s "$keyfile" ]; then
 	  echo "Generating ${keytype} host key for dropbear ..."