Support for setting Windows hosts within WSL

Provided an elevated shell session is used, it is possible to modify the Windows hosts file within WSL (Windows Subsystem for Linux). It would be useful if hostile supported working with Windows hosts within WSL.

An example of adding hosts;

declare -a LOCAL_DOMAINS=("some-site.test" "api.some-site.test")

# add Domains to hosts
for domain in ${LOCAL_DOMAINS[@]}
do
    if grep -q microsoft /proc/version; then
        declare -a windowsHosts=$(wslpath -u -a C:\\Windows\\System32\\drivers\\etc\\hosts);
        if ! grep --quiet ${domain} $windowsHosts; then
            echo "Adding ${domain} to Windows hosts file..."
            echo "127.0.0.1 ${domain}" | tee -a $windowsHosts || { echo >&2 "Failed to add entry to hosts file - ${domain}, try running WSL terminal instance as admin" ; exit 1; }
        fi
    fi
done

With standard host drive mount configuration, wslpath -u -a C:\\Windows\\System32\\drivers\\etc\\hosts returns /mnt/c/Windows/System32/drivers/etc/hosts. The resolved path should be treated as case sensitive.

Thoughts?

[unilynx]

@benlumia007 I can probably merge any code changes if needed, but I cannot really judge what the expected interfaces are on Windows - (I only test but don’t really develop on that platform, wouldn’t even have expected them to have two different ‘hosts’ files. I only know about the one in system32/drivers/…)

Would a solution for WSL2 also apply to WSL?

You said you already have your own solution, is that in a fork somewhere or not based on hostile code ?

[feross]

Sure, I’m happy to review a PR that adds support for Windows.