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Allow embedding custom files into initfs

--- a/mkinitfs.in

+++ b/mkinitfs.in

@@ -147,6 +147,15 @@

 	cp "${basedir}etc/apk/keys/"* "$tmpdir"/etc/apk/keys/

 }

+initfs_custom_files() {

+	for file in "$custom_files"; do

+		if [ -f "$basedir"/$file ]; then

+			mkdir -p "$tmpdir"/${file%/*}

+			cp "$basedir"/$file "$tmpdir"/$file

+		fi

+	done

+}

+

 initfs_cpio() {

 	if [ -n "$list_sources" ]; then

 		(cd "$tmpdir" && find . | sort)

@@ -287,6 +296,7 @@

 	&& initfs_kmods \

 	&& initfs_firmware \

 	&& initfs_apk_keys \

+	&& initfs_custom_files \

 	&& initfs_cpio

 rc=$?