Merge-KubeConfig.ps1

[CmdletBinding()]
param (
    [Parameter(Mandatory = $true)]
    [string]
    $Source,
    [Parameter(Mandatory = $true)]
    [string]
    $Target
)

Import-Module -Name powershell-yaml
$sourceContent = Get-Content -Path $Source -Raw
$targetContent = Get-Content -Path $Target -Raw

$sourceYaml = ConvertFrom-Yaml -Yaml $sourceContent -Ordered
$targetYaml = ConvertFrom-Yaml -Yaml $targetContent -Ordered

if ( $sourceYaml['kind'] -ne 'Config') {
    throw 'Source is not kubectl config file'
}

if ( $targetYaml['kind'] -ne 'Config') {
    throw 'Target is not kubectl config file'
}

if ($sourceYaml['apiVersion'] -ne $targetYaml['apiVersion']) {
    throw 'API Version is not the same'
}

foreach ($sourceUser in $sourceYaml['users']) {
    if ($sourceUser['name'] -ne 'docker-desktop') {
        $targetUser = $targetYaml['users'] | Where-Object { $_['name'] -eq $sourceUser['name'] }

        if ($null -eq $targetUser) {
            $targetYaml['users'] += $sourceUser
        }
        else {
            $targetUser['user'] = $sourceUser['user']
        }
    }
}

foreach ($sourceCluster in $sourceYaml['clusters']) {
    if ($sourceCluster['name'] -ne 'docker-desktop') {
        $targetCluster = $targetYaml['clusters'] | Where-Object { $_['name'] -eq $sourceCluster['name'] }

        if ($null -eq $targetCluster) {
            $targetYaml['clusters'] += $sourceCluster
        }
        else {
            $targetCluster['cluster'] = $sourceCluster['cluster']
        }
    }
}

foreach ($sourceContext in $sourceYaml['contexts']) {
    if ($sourceContext['name'] -ne 'docker-desktop') {
        $targetContext = $targetYaml['contexts'] | Where-Object { $_['name'] -eq $sourceContext['name'] }

        if ($null -eq $targetContext) {
            $targetYaml['contexts'] += $sourceContext
        }
        else {
            $targetContext['context'] = $sourceContext['context']
        }
    }
}

$targetContent = ConvertTo-Yaml -Data $targetYaml
Set-Content -Path $Target -Value $targetContent