* this is the command that is launching the hanging process: `sh -c cd '/usr/local/.../looker/helltool/jvm-modules'; /nix/store/29w5rv207rcakiabb0hljnfp3nkcd0mv-gradle-6.7/bin/gradle buildHellToolJar`

which then calls: 
`/nix/store/npnlqndq25wimi3nyp334c8hznhxwwik-openjdk-8u272-b10/bin/java -classpath /nix/store/29w5rv207rcakiabb0hljnfp3nkcd0mv-gradle-6.7/lib/gradle/lib/gradle-launcher-6.7.jar org.gradle.launcher.GradleMain buildHellToolJar`

which then hangs