You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: docker.rs
    path of file: ./repos/habitat/components/core/src/util
    
    the code of the file until where you have to start completion: use crate::{error::{Error,
                    Result},
            fs::find_command};
use std::{path::PathBuf,
          process::Command};

const DOCKER_CMD: &str = "docker";

pub fn command_path() -> Result<PathBuf> {
    find_command(DOCKER_CMD).ok_or(Error::DockerCommandNotFound(DOCKER_CMD))
}

/// Makes a best attempt to retrieve the appropriate image tag based on
/// https://hub.docker.com/_/microsoft-windows-servercore
/// Note that changes here should be mirrored in .buildkite/sc
    
pub fn default_base_tag_for_host() -> Result<&'static str> {
    if cfg!(windows) {
        use os_info::Version::*; // for Semantic variant

        let mut cmd = Command::new(command_path()?);
        cmd.arg("info").arg("--format='{{.Isolation}}'");
        let result = cmd.output().expect("Docker command failed to spawn");

        let info = os_info::get();

        if String::from_utf8(result.stdout)?.trim() == "'hyperv'" {
            // Match hyperv windows image with host kernel
            if *info.version() >= Semantic(10, 0, 20348) {
                Ok("ltsc2022")
            } else if *info.version() >= Semantic(10, 0, 17763) {
                Ok("ltsc2019")
            } else {
                Ok("ltsc2016")
            }
        } else {
            match info.version() {
                Semantic(10, 0, 14393) => Ok("ltsc2016"),
                Semantic(10, 0, 17134) => Ok("1803"),
                Semantic(10, 0, 17763) => Ok("ltsc2019"),
                Semantic(10, 0, 18362) => Ok("1903"),
                Semantic(10, 0, 20348) => Ok("ltsc2022"),
                unsupported_version => {
                    Err(Error::UnsupportedDockerHostKernel(unsupported_version.to_string()))
                }
            }
        }
    } else {
        Ok("latest")
    }
}