Add entry in windows' hosts file for wsl

wsl_ip.ps1

# Execute using:
# powershell -ExecutionPolicy Bypass -File .\wsl_ip.ps1

# You need to make sure current user has write access to c:\Windows\system32\Drivers\etc\hosts

#source :
#https://github.com/microsoft/WSL/issues/4210#issuecomment-788729288
#https://github.com/vprokofyev/powershell/blob/main/wsl2-scripts/wsl_ip.ps1

# Then changed by VL

$ErrorActionPreference = "Stop"


# Make sure you backed up $windir\system32\Drivers\etc\hosts

# Get ip from wsl, thanks Rakasch
$wsl_ip = wsl hostname -I
$new_entry = $wsl_ip + "wsl"


# Path to hosts file
$hostsFile  = "$($env:windir)\system32\Drivers\etc\hosts"
$hostsFileBackup = "D:\hosts.backup"


if (-not(Test-Path -Path $hostsFileBackup -PathType Leaf)) {
    Write-Output  "Making backup"
    cp $hostsFile $hostsFileBackup
} else {
    Write-Output  "Recovering backup"
    cp $hostsFileBackup $hostsFile
    Write-Output  "Restored backup"
}

# Read file and extract string with wsl ip-address if it is there
# org regexp:
#$regex_wsl_ip = '(172).\d{1,3}\.\d{1,3}\.\d{1,3}\b wsl'

#vl reg_exp:
$regex_wsl_ip = '^(172).* wsl$'

$wsl_string = (Get-Content -path $hostsFile |  Select-String -Pattern "$regex_wsl_ip" -AllMatches).Matches.Value


# Check if string exists in file and rewrite it
if ($wsl_string) {
    # Open file, replace strings, write
    (Get-Content $hostsFile).Replace($wsl_string, $new_entry) | Set-Content $hostsFile
    Write-Output "Rewrited $new_entry in $hostsFile"
}
else {
    # Open file, add string, write
    Add-Content -Path $hostsFile -Value $new_entry | Set-Content $hostsFile
    Write-Output "Added $new_entry in $hostsFile"
}

# Delete backup file if we ever get here
if (Test-Path -Path $hostsFileBackup -PathType Leaf) {
    Write-Output "Deleting backup file "
    rm $hostsFileBackup
}