base-files: Remove nand.sh dependency from emmc upgrade

emmc_do_upgrade() relies on identify() from the nand.sh upgrade helper.
This only works because FEATURES=emmc targets also tend to include
FEATURES=nand.

Rename identify_magic() to identify_magic_long() to match the common.sh
style and make it clear it pairs with other *_long() variants (and not,
say *_word()).

Signed-off-by: Brian Norris <[email protected]>

package/base-files/files/lib/upgrade/common.sh

@@ -127,6 +127,33 @@ get_magic_fat32() {
 	(get_image "$@" | dd bs=1 count=5 skip=82) 2>/dev/null
 }
 
+identify_magic_long() {
+	local magic=$1
+	case "$magic" in
+		"55424923")
+			echo "ubi"
+			;;
+		"31181006")
+			echo "ubifs"
+			;;
+		"68737173")
+			echo "squashfs"
+			;;
+		"d00dfeed")
+			echo "fit"
+			;;
+		"4349"*)
+			echo "combined"
+			;;
+		"1f8b"*)
+			echo "gzip"
+			;;
+		*)
+			echo "unknown $magic"
+			;;
+	esac
+}
+
 part_magic_efi() {
 	local magic=$(get_magic_gpt "$@")
 	[ "$magic" = "EFI PART" ]

package/base-files/files/lib/upgrade/emmc.sh

@@ -58,7 +58,7 @@ emmc_copy_config() {
 }
 
 emmc_do_upgrade() {
-	local file_type=$(identify $1)
+	local file_type=$(identify_magic_long "$(get_magic_long "$1")")
 
 	case "$file_type" in
 		"fit")  emmc_upgrade_fit $1;;

package/base-files/files/lib/upgrade/nand.sh

@@ -65,40 +65,12 @@ get_magic_long_tar() {
 	(tar xO${3}f "$1" "$2" | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2> /dev/null
 }
 
-identify_magic() {
-	local magic=$1
-	case "$magic" in
-		"55424923")
-			echo "ubi"
-			;;
-		"31181006")
-			echo "ubifs"
-			;;
-		"68737173")
-			echo "squashfs"
-			;;
-		"d00dfeed")
-			echo "fit"
-			;;
-		"4349"*)
-			echo "combined"
-			;;
-		"1f8b"*)
-			echo "gzip"
-			;;
-		*)
-			echo "unknown $magic"
-			;;
-	esac
-}
-
-
 identify() {
-	identify_magic $(nand_get_magic_long "$@")
+	identify_magic_long $(nand_get_magic_long "$@")
 }
 
 identify_tar() {
-	identify_magic $(get_magic_long_tar "$@")
+	identify_magic_long $(get_magic_long_tar "$@")
 }
 
 identify_if_gzip() {