Devcert falsely decides that a domain is already part of a host file as long as the word appears within the file

[wessberg]

In darwin.ts, the addDomainToHostFileIfMissing function will falsely decide that the provided domains name is already part of the hosts file if the word provided as domain occurs within the file. Here's an excerpt of the current code:

// Inside darwin.ts
 async addDomainToHostFileIfMissing(domain: string) {
    // This line only checks if the word appears within the file
    if (!hostsFileContents.includes(domain)) {
        // ...
    }
  }

This leads to plenty of false positives.
For example, consider this scenario:

We have a hosts file:

##
# Host Database
##
127.0.0.1 my-app.test

Now, we want to generate a certficate for just app.test. Because the hosts file already includes the string app.test, addDomainToHostFileIfMissing will decide that it is already included and skip adding the domain to the hosts file.

An example of a more robust solution would be to split the key-value pairs and perform strict equality checks between the two domain names