Lobotomize CoreDNS

Using build tags remove unnecessary deps for:
- plugin/cache
- plugin/forward

The main idea is to drop Caddy server from deps.

README.md

@@ -9,6 +9,18 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/coredns/coredns)](https://goreportcard.com/report/coredns/coredns)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/1250/badge)](https://bestpractices.coreinfrastructure.org/projects/1250)
 
+# Important!
+
+**This is lobotomized version of CoreDNS, which is used in TalosOS project. The main idea is to trim as many dependencies
+as possible, to make it as small as possible. This is achivied using build tags on required dependencies. This ensures
+that we can easily update CoreDNS to the latest version, without worrying about merge conflicts.**
+
+
+
+**The rest of the README is the same as in the original CoreDNS project.**
+
+---
+
 CoreDNS is a DNS server/forwarder, written in Go, that chains [plugins](https://coredns.io/plugins).
 Each plugin performs a (DNS) function.
 

go.mod

@@ -1,51 +1,47 @@
 module github.com/coredns/coredns
 
-go 1.21
+go 1.22.0
 
 require (
 	github.com/Azure/azure-sdk-for-go v68.0.0+incompatible
-	github.com/Azure/go-autorest/autorest v0.11.29
-	github.com/Azure/go-autorest/autorest/azure/auth v0.5.12
-	github.com/antonmedv/expr v1.15.5
 	github.com/apparentlymart/go-cidr v1.1.0
-	github.com/aws/aws-sdk-go v1.53.5
+	github.com/aws/aws-sdk-go v1.53.18
 	github.com/coredns/caddy v1.1.1
 	github.com/dnstap/golang-dnstap v0.4.0
 	github.com/farsightsec/golang-framestream v0.3.0
-	github.com/go-logr/logr v1.4.1
+	github.com/go-logr/logr v1.4.2
 	github.com/grpc-ecosystem/grpc-opentracing v0.0.0-20180507213350-8e809c8a8645
-	github.com/infobloxopen/go-trees v0.0.0-20200715205103-96a057b8dfb9
 	github.com/matttproud/golang_protobuf_extensions v1.0.4
 	github.com/miekg/dns v1.1.59
 	github.com/opentracing/opentracing-go v1.2.0
 	github.com/openzipkin-contrib/zipkin-go-opentracing v0.5.0
 	github.com/openzipkin/zipkin-go v0.4.3
-	github.com/oschwald/geoip2-golang v1.9.0
+	github.com/oschwald/geoip2-golang v1.11.0
 	github.com/prometheus/client_golang v1.19.1
 	github.com/prometheus/client_model v0.6.1
-	github.com/prometheus/common v0.53.0
-	github.com/quic-go/quic-go v0.44.0
-	go.etcd.io/etcd/api/v3 v3.5.13
-	go.etcd.io/etcd/client/v3 v3.5.13
-	golang.org/x/crypto v0.23.0
-	golang.org/x/sys v0.20.0
-	google.golang.org/api v0.172.0
-	google.golang.org/grpc v1.63.2
-	google.golang.org/protobuf v1.33.0
+	github.com/prometheus/common v0.54.0
+	github.com/quic-go/quic-go v0.45.0
+	go.etcd.io/etcd/api/v3 v3.5.14
+	go.etcd.io/etcd/client/v3 v3.5.14
+	golang.org/x/crypto v0.24.0
+	golang.org/x/sys v0.21.0
+	google.golang.org/api v0.183.0
+	google.golang.org/grpc v1.64.0
+	google.golang.org/protobuf v1.34.1
 	gopkg.in/DataDog/dd-trace-go.v1 v1.64.0
-	k8s.io/api v0.29.3
-	k8s.io/apimachinery v0.29.3
-	k8s.io/client-go v0.29.3
+	k8s.io/api v0.30.1
+	k8s.io/apimachinery v0.30.1
+	k8s.io/client-go v0.30.1
 	k8s.io/klog/v2 v2.120.1
-	k8s.io/utils v0.0.0-20230726121419-3b25d923346b
 )
 
 require (
-	cloud.google.com/go/compute v1.24.0 // indirect
-	cloud.google.com/go/compute/metadata v0.2.3 // indirect
+	cloud.google.com/go/auth v0.5.1 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.2 // indirect
+	cloud.google.com/go/compute/metadata v0.3.0 // indirect
 	github.com/Azure/go-autorest v14.2.0+incompatible // indirect
+	github.com/Azure/go-autorest/autorest v0.11.29 // indirect
 	github.com/Azure/go-autorest/autorest/adal v0.9.22 // indirect
-	github.com/Azure/go-autorest/autorest/azure/cli v0.4.5 // indirect
 	github.com/Azure/go-autorest/autorest/date v0.3.0 // indirect
 	github.com/Azure/go-autorest/autorest/to v0.2.0 // indirect
 	github.com/Azure/go-autorest/logger v0.2.1 // indirect
@@ -63,7 +59,6 @@ require (
 	github.com/coreos/go-semver v0.3.0 // indirect
 	github.com/coreos/go-systemd/v22 v22.3.2 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/dimchansky/utfbom v1.1.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/ebitengine/purego v0.6.0-alpha.5 // indirect
 	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
@@ -86,29 +81,28 @@ require (
 	github.com/google/s2a-go v0.1.7 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
-	github.com/googleapis/gax-go/v2 v2.12.3 // indirect
+	github.com/googleapis/gax-go/v2 v2.12.4 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
-	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/onsi/ginkgo/v2 v2.13.0 // indirect
+	github.com/onsi/ginkgo/v2 v2.15.0 // indirect
 	github.com/opentracing-contrib/go-observer v0.0.0-20170622124052-a52f23424492 // indirect
-	github.com/oschwald/maxminddb-golang v1.11.0 // indirect
+	github.com/oschwald/maxminddb-golang v1.13.0 // indirect
 	github.com/outcaste-io/ristretto v0.2.3 // indirect
 	github.com/philhofer/fwd v1.1.2 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect
 	github.com/secure-systems-lab/go-securesystemslib v0.7.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/tinylib/msgp v1.1.8 // indirect
-	go.etcd.io/etcd/client/pkg/v3 v3.5.13 // indirect
+	go.etcd.io/etcd/client/pkg/v3 v3.5.14 // indirect
 	go.opencensus.io v0.24.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
 	go.opentelemetry.io/otel v1.24.0 // indirect
@@ -121,20 +115,20 @@ require (
 	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
 	golang.org/x/mod v0.17.0 // indirect
 	golang.org/x/net v0.25.0 // indirect
-	golang.org/x/oauth2 v0.18.0 // indirect
+	golang.org/x/oauth2 v0.21.0 // indirect
 	golang.org/x/sync v0.7.0 // indirect
-	golang.org/x/term v0.20.0 // indirect
-	golang.org/x/text v0.15.0 // indirect
+	golang.org/x/term v0.21.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
-	golang.org/x/tools v0.21.0 // indirect
+	golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d // indirect
 	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
-	google.golang.org/appengine v1.6.8 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20240311132316-a219d84964c2 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240415180920-8c6c420018be // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20240521202816-d264139d666e // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	k8s.io/kube-openapi v0.0.0-20231010175941-2dd684a91f00 // indirect
+	k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 // indirect
+	k8s.io/utils v0.0.0-20240502163921-fe8a2dddb1d0 // indirect
 	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
 	sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect
 	sigs.k8s.io/yaml v1.3.0 // indirect