is-docker

I'm on macOS and have installed docker through Docker Desktop . Here is a simple demo of not recognizing docker during the build process: As we can see is not present, but is. Seems to me - at least at surface level - unlikely to pass outside of docker but to better detect the build process, at least on my platform

It appears that detection fails on the latest docker version (27.3.1) of the host is Linux Upon investigation it seems that is now empty and the check for "docker" fails !image This is the ouput on docker v27.3.1 on a Windows host !image

This package returns true when I try to run in in my own system (not in docker). I use Ubuntu 18.04 and the package version is 2.2.0. I suppose, positive match comes from the check Output of /proc/self/cgroup from the native system terminal: If I check it inside a docker container, the ouput of file is the next: I don't know from where the part comes from, so I can't say how it should be modified to run correctly. But now I had to go on previous version (where only "docker" in cgroups is being detected)