I've working on a project in which the s3 bucket in aws is already created via console and the lambda code is already there as an object. I'm creating a terraform script in which I will reference that zip and then create a lambda function and publish it. Incase there's any change detected in the code (the code zip can be changed from console), then it should publish latest. How can I do that? Currently I'm getting errror-

module "student_lambda"{
source = "https://....." // I'm using a template which creates lambda function
handler..
s3_bucket = "SaintJoseph"
s3_key = "grade5/studentlist.zip"
source_code_hash = filebase64sha256("/grade5/studentlist.zip").etag
.....
}

My bucket structure

SaintJoseph -- bucketname

• grade5
  • studentlist.zip
  • subjectlist.zip
• grade6

Errors I'm getting in plan -

1. Error in function call - Call to function filebase64sha256 failed: open grade5/studentlist.zip: no such file or directory

2. The bucket key or source is invalid.

Can someone please also help to let me know what to use like etag/source_code_hash, etc so that it only takes changes when zip file is changed and how to remove existing error?

CodePudding user response：

filebase64sha256 works only on local filesystem. To reference etag of an s3 object you have to use aws_s3_object data source. The source returns etag.