Add support for config file

PKGBUILD

@@ -18,13 +18,15 @@ source=(
     "dropbear_install"
     "LICENSE"
 )
+backup=( "etc/dropbear/config" )
 changelog=ChangeLog
-sha256sums=('6c529408125bd0c446162f8d4a16d7262d6b39896d8e6f87d364f7b299203315'
-            '6e6fcb6a1f3b1ffae85a8b72b56b8fd2b221777713d221641d8cbfd2ad5637b3'
+sha256sums=('9852ab6a3ba4191ed3eabbfebb2876fe7ff1003f62309043ec0b8b9374e3b9ee'
+            '3f6cb2c6edd2a5510e9d2366b68815b0d0f9d7cfc066c26c4b842af44d2024fd'
             'ac69d63ecc672c698582b0fc260dbfe42d71adcdab707f807c8e1113be11abd8')
 
 package() {
     install -Dm0644 dropbear_hook "$pkgdir/usr/lib/initcpio/hooks/dropbear"
     install -Dm0644 dropbear_install "$pkgdir/usr/lib/initcpio/install/dropbear"
+    install -Dm0644 dropbear_config "$pkgdir/etc/dropbear/config"
     install -Dm0644 -t "$pkgdir/usr/share/licenses/$pkgname/" LICENSE
 }

dropbear_config

@@ -0,0 +1 @@
+DROPBEAR_PORT=22

dropbear_hook

@@ -4,8 +4,15 @@ run_hook() {
     [ -d /dev/pts ] || mkdir -p /dev/pts
     mount -t devpts devpts /dev/pts
 
-    echo "Starting dropbear"
-    /usr/sbin/dropbear -E -s -j -k
+    if [ -s /etc/dropbear/config ]; then
+        echo "Found dropbear config file"
+        . /etc/dropbear/config
+    fi
+
+    port=${DROPBEAR_PORT:-22}
+
+    echo "Starting dropbear on port $port"
+    /usr/sbin/dropbear -E -s -j -k -p "$port"
 }
 
 run_cleanuphook() {

dropbear_install

@@ -2,6 +2,7 @@
 
 set -e
 
+CONFIG_FILE="/etc/dropbear/config"
 KEY_TYPES="ed25519 ecdsa rsa"
 
 get_fingerprint() {
@@ -83,6 +84,12 @@ build() {
     add_dir "/var/log"
     touch "${BUILDROOT}"/var/log/lastlog
 
+    if [ -s $CONFIG_FILE ]; then
+        echo "Using config file $CONFIG_FILE:"
+        cat $CONFIG_FILE
+        add_file $CONFIG_FILE
+    fi
+
     add_runscript
 }