Update values in json with jq (shell script) - json

Question

I am trying to update a couple values in a json array (separate file) with a shell script. Basically the logic is, set an environment variable called URL, ping that URL and add it to the json-- if 0, update another json field to SUCCESS, else update to FAILED.
Here is are the files:
info.json:
{
"name": "PingTest",",
"metrics": [
{
"event_type": "PingResult",
"provider": "test",
"providerUrl": "URL",
"providerResult": "RESULT"
}
]
}
pinger.sh:
#!/bin/sh
JSON=`cat info.json` #read in JSON
#Assume URL variable is set to www.dksmfdkf.com
ping -q -c 1 "$URL" > /dev/null #ping url
if [ $? -eq 0 ]; then #if ping success, replace result in json template
JSON=`echo ${JSON} | jq --arg v "$URL" '.metrics[].providerUrl |= $v'
info.json`
JSON=`echo ${JSON} | jq '.metrics[].providerResult |= "SUCCESS"' info.json`
else
JSON=`echo ${JSON} | jq --arg v "$URL" '.metrics[].providerUrl |= $v'
info.json`
JSON=`echo ${JSON} | jq '.metrics[].providerResult |= "FAILED"' info.json`
fi
#Remove whitespace from json
JSON=`echo $JSON | tr -d ' \t\n\r\f'`
#Print the result
echo "$JSON"
The problem is my json file isn't getting updated properly, example result when running:
home:InfraPingExtension home$ ./pinger.sh
ping: cannot resolve : Unknown host
{
"name": "PingTest",
"metrics": [
{
"event_type": "PingResult",
"provider": "test",
"providerUrl": "",
"providerResult": "RESULT"
}
]
}
{
"name": "PingTest",
"metrics": [
{
"event_type": "PingResult",
"provider": "test",
"providerUrl": "URL",
"providerResult": "FAILED"
}
]
}
{"name":"PingTest","metrics":[{"event_type":"PingResult","provider":"test","providerUrl":"URL","providerResult":"RESULT"}]}

Answer 1

This would be greatly simplified by only calling jq once.
host=${URL#http://}; host=${host#https://}; host=${host%%/*}
if ping -q -c 1 "$host"; then
result=SUCCESS
else
result=FAILED
fi
JSON=$(
jq -c \
--arg url "$URL" \
--arg result "$result" \
'.metrics[].providerUrl |= $url
| .metrics[].providerResult |= $result
' info.json
)