Add logging, covert sh to dash compatitable

Dockerfile

@@ -2,7 +2,6 @@ FROM alpine:3.6
 MAINTAINER JoshuaAvalon
 
 RUN apk add --update curl && \
-    apk add --update bash && \
     apk add --update perl && \
     rm -rf /var/cache/apk/*
 

cloudflare.sh

@@ -1,27 +1,30 @@
 #!/bin/sh
-echo `date "+%Y-%m-%d %H:%M:%S"`
+
+date "+%Y-%m-%d %H:%M:%S"
 ip_file="ip.txt"
 
 new_ip=$(curl -s http://ipecho.net/plain)
 
 if [ -f $ip_file ]; then
     ip=$(cat $ip_file)
-    if [ $ip == $new_ip ]; then
+    if [ "$ip" = "$new_ip" ]; then
 		echo "Same ip: $ip"
         exit 0
     fi
 fi
 
 ip="$new_ip"
-	zone_id=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$ZONE" -H "X-Auth-Email: $EMAIL" -H "X-Auth-Key: $API" -H "Content-Type: application/json" | perl -nle'print $& if m{(?<="id":")[^"]*}' | head -1 )
+echo "IP: $ip"
+zone_id=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$ZONE" -H "X-Auth-Email: $EMAIL" -H "X-Auth-Key: $API" -H "Content-Type: application/json" | perl -nle'print $& if m{(?<="id":")[^"]*}' | head -1 )
+echo "Zone ID: $zone_id"
 record_id=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?name=$ZONE" -H "X-Auth-Email: $EMAIL" -H "X-Auth-Key: $API" -H "Content-Type: application/json"  | perl -nle'print $& if m{(?<="id":")[^"]*}')
+echo "Record ID: $record_id"
 update=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$record_id" -H "X-Auth-Email: $EMAIL" -H "X-Auth-Key: $API" -H "Content-Type: application/json" --data "{\"id\":\"$zone_id\",\"type\":\"A\",\"name\":\"$ZONE\",\"content\":\"$ip\",\"ttl\":$TTL,\"proxied\":$PROXY}")
 
-if [[ ${update} == *"\"success\":false"* ]]; then
-	echo "API UPDATE FAILED. DUMPING RESULTS:\\n$update"
-	exit 1
-else
+if echo "$update" | grep -q "\"success\":true"; then
 	echo "IP changed to: $ip"	
-    echo "$ip" > $ip_file
+  echo "$ip" > $ip_file
+else
+	printf "Update failed:\\n%s" "$update"
+	exit 1
 fi
-