clojure.java.shell/launch doesn't drain output which makes the process hang. Here is an example of curl downloading and printing 1mb of text:
user=> (require '[clojure.java.shell :refer [launch]])
user=> (launch "curl" "https://gist.githubusercontent.com/khaykov/a6105154becce4c0530da38e723c2330/raw/41ab415ac41c93a198f7da5b47d604956157c5c3/gistfile1.txt")
I think a solution would be to move clojure.java.shell away from
(.exit (Runtime/getRuntime)) for this specific function and use
java.lang.ProcessBuilder instead, which has an option to discard output.
One caveat: DISCARD is only available on Java 9 and newer. We could do resolve in a try/catch on the top level to see if DISCARD is available and then use that, if available and fall back on PIPE if it isn't. Alternatives: use a thread to consume output while the process is running. Or redirect to a temporary file.
I'll provide a patch, if desired, and when agreed upon the direction of the solution.