base-files: upgrade: log with date prefix

And log to stderr

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

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

@@ -64,7 +64,7 @@ ask_bool() {
 }
 
 v() {
-	[ -n "$VERBOSE" ] && [ "$VERBOSE" -ge 1 ] && echo "$@"
+	[ -n "$VERBOSE" ] && [ "$VERBOSE" -ge 1 ] && echo "$(date) upgrade: $@" >&2
 }
 
 json_string() {

package/base-files/files/lib/upgrade/stage2

@@ -42,7 +42,7 @@ switch_to_ramfs() {
 		mtd partx losetup mkfs.ext4 nandwrite flash_erase	\
 		ubiupdatevol ubiattach ubiblock ubiformat		\
 		ubidetach ubirsvol ubirmvol ubimkvol			\
-		snapshot snapshot_tool					\
+		snapshot snapshot_tool date				\
 		$RAMFS_COPY_BIN
 	do
 		local file="$(command -v "$binary" 2>/dev/null)"