pass arguments of make commands - bash

Question

I have a sequence of make commands to upload zip file to s3 bucket and then update the lambda function reading that s3 file as source code. Once I update the lambda function, I wish to publish it and after publishing it, I want to attach an event to that lambda function using lambda bridge.
I can do most of these commands automatically using make. For example:
clean:
#rm unwanted_build_files.zip
build-lambda-pkg:
mkdir pkg
cd pkg && docker run #something something
cd pkg && zip -9qr build.zip
cp pkg/build.zip .
rm pkg
upload-s3:
aws s3api put-object --bucket my_bucket \
--key build.zip --body build.zip
update-lambda:
aws lambda update-function-code --function-name my_lambda \
--s3-bucket my_bucket \
--s3-key build.zip
publish-lambda:
aws lambda publish-version --function-name my_lambda
## I can get "Arn" value from publish-lambda command. publish-lambda ##returns a json (or I would say it prints a json type structure on cmd) which has one key as "FunctionArn"
attach-event:
aws events put-targets --rule rstats-post-explaination-at-10pm-ist \
--targets "Id"="1","Arn"="arn:aws:lambda:::function/my_lambda/version_number"
## the following combines the above command into single command
build-n-update: clean build-lambda-pkg upload-s3 update-lambda
I am stuck at the last step i.e. to combine and include publish-lambda and attach-event in the build-n-update command. The problem is I am unable to pass argument from previous command to next command. I will try to explain it better:
publish-lambda prints a json style output on terminal:
{
"FunctionName": "my_lambda",
"FunctionArn": "arn:aws:lambda:us-east-2:12345:function:my_lambda:5",
"Runtime": "python3.6",
"Role": "arn:aws:iam::12345:role/my_role",
"Handler": "lambda_function.lambda_handler",
"CodeSize": 62403592,
"Description": "",
"Timeout": 180,
"MemorySize": 512,
"LastModified": "2021-02-28T17:34:04.374+0000",
"CodeSha256": "ErfsYHVMFCQBg4iXx5ev9Z0U=",
"Version": "5",
"Environment": {
"Variables": {
"PATH": "/var/task/bin",
"PYTHONPATH": "/var/task/src:/var/task/lib"
}
},
"TracingConfig": {
"Mode": "PassThrough"
},
"RevisionId": "49b5-acdd-c1032aa16bfb",
"State": "Active",
"LastUpdateStatus": "Successful"
}
I wish to extract function arn from the above output stored in key "FunctionArn" and use it in the next command i.e. attach-event as attach-event has a --targets argument which takes the "Arn" of last published function.
Is it possible to do in single command?
I have tried to experiment a bit as follows:
build-n-update: clean build-lambda-pkg upload-s3 update-lambda
make publish-lambda | xargs jq .FunctionArn -r {}
But this throws an error:
jq: Unknown option --function-name
Please help

Answer 1

Well, running:
make publish-lambda | xargs jq .FunctionArn -r {}
will print the command to be run, then the output of the command (run it yourself from you shell prompt and see). Of course, jq cannot parse the command line make prints.
Anyway, what would be the goal of this? You'd just print the function name to stdout and it wouldn't do you any good.
You basically have two choices: one is to combine the two commands into a single make recipe, so you can capture the information you need in a shell variable:
build-n-update: clean build-lambda-pkg upload-s3 update-lambda
func=$$(aws lambda publish-version --function-name my_lambda \
| jq .FunctionArn -r); \
aws events put-targets --rule rstats-post-explaination-at-10pm-ist \
--targets "Id"="1","Arn"="$$func"
The other alternative is to redirect the output of publish-version to a file, then parse that file in the attach-event target recipe:
publish-lambda:
aws lambda publish-version --function-name my_lambda > publish.json
attach-event:
aws events put-targets --rule rstats-post-explaination-at-10pm-ist \
--targets "Id"="1","Arn"="$$(jq .FunctionArn -r publish.json)"