ronantakizawa/codereview-bench huggingface dataset:
Repository: k3s-io/k3s
File: pkg/etcd/s3.go (Go)

Code before:
		if info.Err != nil {
			return nil, info.Err
		}

		// skip metadata
		if path.Base(path.Dir(info.Key)) == metadataDir {
			continue
		}

		snapshotFiles = append(snapshotFiles, info)
	}

	if len(snapshotFiles) <= s.config.EtcdSnapshotRetention {
		return nil, nil
	}

	// sort newest-first so we can prune entries past the retention count
	sort.Slice(snapshotFiles, func(i, j int) bool {
		return snapshotFiles[j].LastModified.Before(snapshotFiles[i].LastModified)
	})

	deleted := []string{}
	for _, df := range snapshotFiles[s.config.EtcdSnapshotRetention:] {
		logrus.Infof("Removing S3 snapshot: s3://%s/%s", s.config.EtcdS3BucketName, df.Key)

		key := strings.TrimPrefix(df.Key, s.config.EtcdS3Folder)
		if err := s.deleteSnapshot(ctx, key); err != nil {
			return deleted, err
		}
		deleted = append(deleted, df.Key)
	}

	return deleted, nil
}

func (s *S3) deleteSnapshot(ctx context.Context, key string) error {
	ctx, cancel := context.WithTimeout(ctx, s.config.EtcdS3Timeout)
	defer cancel()

	key = path.Join(s.config.EtcdS3Folder, key)
	err := s.client.RemoveObject(ctx, s.config.EtcdS3BucketName, key, minio.RemoveObjectOptions{})
	if err == nil || isNotExist(err) {
		metadataKey := path.Join(path.Dir(key), metadataDir, path.Base(key))
		if merr := s.client.RemoveObject(ctx, s.config.EtcdS3BucketName, metadataKey, minio.RemoveObjectOptions{}); merr != nil && !isNotExist(merr) {
			err = merr
		}
	}

	return err
}


Review comment (suggestion):
I think we use path.Base for this elsewhere in this function?
```suggestion
		key := path.Base(df.Key)
```

Code after:
		if info.Err != nil {
			return nil, info.Err
		}

		// skip metadata
		if path.Base(path.Dir(info.Key)) == metadataDir {
			continue
		}

		snapshotFiles = append(snapshotFiles, info)
	}

	if len(snapshotFiles) <= s.config.EtcdSnapshotRetention {
		return nil, nil
	}

	// sort newest-first so we can prune entries past the retention count
	sort.Slice(snapshotFiles, func(i, j int) bool {
		return snapshotFiles[j].LastModified.Before(snapshotFiles[i].LastModified)
	})

	deleted := []string{}
	for _, df := range snapshotFiles[s.config.EtcdSnapshotRetention:] {
		logrus.Infof("Removing S3 snapshot: s3://%s/%s", s.config.EtcdS3BucketName, df.Key)

		key := path.Base(df.Key)
		if err := s.deleteSnapshot(ctx, key); err != nil {
			return deleted, err
		}
		deleted = append(deleted, key)
	}

	return deleted, nil
}

func (s *S3) deleteSnapshot(ctx context.Context, key string) error {
	ctx, cancel := context.WithTimeout(ctx, s.config.EtcdS3Timeout)
	defer cancel()

	key = path.Join(s.config.EtcdS3Folder, key)
	err := s.client.RemoveObject(ctx, s.config.EtcdS3BucketName, key, minio.RemoveObjectOptions{})
	if err == nil || isNotExist(err) {
		metadataKey := path.Join(path.Dir(key), metadataDir, path.Base(key))
		if merr := s.client.RemoveObject(ctx, s.config.EtcdS3BucketName, metadataKey, minio.RemoveObjectOptions{}); merr != nil && !isNotExist(merr) {
			err = merr
		}
	}

	return err
}
Repository: k3s-io/k3s
File: pkg/server/secrets-encrypt.go (Go)

Code before:
package server

import (
	"context"
	"crypto/rand"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
	"time"

	apierrors "k8s.io/apimachinery/pkg/api/errors"

	"github.com/blang/semver/v4"
	"github.com/k3s-io/k3s/pkg/cluster"
	"github.com/k3s-io/k3s/pkg/daemons/config"
	"github.com/k3s-io/k3s/pkg/secretsencrypt"
	"github.com/k3s-io/k3s/pkg/util"
	"github.com/pkg/errors"
	"github.com/rancher/wrangler/v3/pkg/generated/controllers/core"
	"github.com/sirupsen/logrus"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/runtime"
	apiserverconfigv1 "k8s.io/apiserver/pkg/apis/apiserver/v1"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/tools/clientcmd"
	"k8s.io/client-go/tools/pager"
	"k8s.io/client-go/util/retry"
	"k8s.io/utils/ptr"
)

const aescbcKeySize = 32

type EncryptionState struct {
	Stage        string   `json:"stage"`
	ActiveKey    string   `json:"activekey"`

Review comment (suggestion):
nit: remove trailing empty line so that this gets sorted in with the rest of the imports
```suggestion
	apierrors "k8s.io/apimachinery/pkg/api/errors"
```

Code after:
package server

import (
	"context"
	"crypto/rand"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
	"time"

	"github.com/blang/semver/v4"
	"github.com/k3s-io/k3s/pkg/cluster"
	"github.com/k3s-io/k3s/pkg/daemons/config"
	"github.com/k3s-io/k3s/pkg/secretsencrypt"
	"github.com/k3s-io/k3s/pkg/util"
	"github.com/pkg/errors"
	"github.com/rancher/wrangler/v3/pkg/generated/controllers/core"
	"github.com/sirupsen/logrus"
	corev1 "k8s.io/api/core/v1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/types"
	apiserverconfigv1 "k8s.io/apiserver/pkg/apis/apiserver/v1"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/tools/clientcmd"
	"k8s.io/client-go/tools/pager"
	"k8s.io/client-go/util/retry"
	"k8s.io/utils/ptr"
)

const aescbcKeySize = 32

type EncryptionState struct {
	Stage        string   `json:"stage"`
	ActiveKey    string   `json:"activekey"`
Repository: k3s-io/k3s
File: pkg/flock/flock_unix_test.go (Go)

Code before:
Copyright 2016 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package flock

import (
	"testing"
)

func Test_UnitFlock(t *testing.T) {
	tests := []struct {
		name      string
		path      string
		wantCheck bool
		wantErr   bool
	}{
		{
			name: "Basic Flock Test",
			path: "/tmp/testlock.test",

			wantCheck: true,
			wantErr:   false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			lock, err := Acquire(tt.path)
			if (err != nil) != tt.wantErr {
				t.Errorf("Acquire() error = %v, wantErr %v", err, tt.wantErr)
				return
			}

			if got := CheckLock(tt.path); got != tt.wantCheck {
				t.Errorf("CheckLock() = %+v\nWant = %+v", got, tt.wantCheck)
			}

			if err := Release(lock); (err != nil) != tt.wantErr {
				t.Errorf("Release() error = %v, wantErr %v", err, tt.wantErr)
			}

Review comment (bug):
should we check for the error here? and return false if err != nil ?

Code after:
Copyright 2016 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package flock

import (
	"os/exec"
	"strings"
	"testing"
)

// checkLock checks whether any process is using the lock
func checkLock(path string) bool {
	lockByte, _ := exec.Command("lsof", "-w", "-F", "lfn", path).Output()
	locks := string(lockByte)
	if locks == "" {
		return false
	}
	readWriteLock := strings.Split(locks, "\n")[2]
	return readWriteLock == "lR" || readWriteLock == "lW"
}

func Test_UnitFlock(t *testing.T) {
	tests := []struct {
		name      string
		path      string
		wantCheck bool
		wantErr   bool
	}{
		{
			name: "Basic Flock Test",
			path: "/tmp/testlock.test",

			wantCheck: true,
			wantErr:   false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
Repository: k3s-io/k3s
File: pkg/cluster/managed.go (Go)

Code before:
}

// deleteNodePasswdSecret wipes out the node password secret after restoration
func (c *Cluster) deleteNodePasswdSecret(ctx context.Context) {
	nodeName := os.Getenv("NODE_NAME")
	secretsClient := c.config.Runtime.Core.Core().V1().Secret()
	if err := nodepassword.Delete(secretsClient, nodeName); err != nil {
		if apierrors.IsNotFound(err) {
			logrus.Debugf("Node password secret is not found for node %s", nodeName)
			return
		}
		logrus.Warnf("failed to delete old node password secret: %v", err)
	}
}

// handlerNoEtcd wraps a handler with an error message indicating that etcd is not deployed.
func handlerNoEtcd(handler http.Handler) http.Handler {
	r := mux.NewRouter().SkipClean(true)
	r.NotFoundHandler = handler

	ir := r.Path("/db/info").Subrouter()
	ir.HandleFunc("", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		w.Write([]byte("K3s is not deployed with an etcd datastore"))
	})

	return r
}


Review comment (refactor):
1. Match the /db/ prefix so that we send a correct error for any of the etcd handlers
2. Use the same error string as the existing handler
3. Use the helper function
```suggestion
	ir := r.PathPrefix("/db/").Subrouter()
	ir.HandleFunc("", func(w http.ResponseWriter, r *http.Request) {
		util.SendError(errors.New("etcd disabled"), resp, req, http.StatusBadRequest)
	})
```

Code after:
		etcdProxy.Update(clientURLs)
		return false, nil
	})
}

// deleteNodePasswdSecret wipes out the node password secret after restoration
func (c *Cluster) deleteNodePasswdSecret(ctx context.Context) {
	nodeName := os.Getenv("NODE_NAME")
	secretsClient := c.config.Runtime.Core.Core().V1().Secret()
	if err := nodepassword.Delete(secretsClient, nodeName); err != nil {
		if apierrors.IsNotFound(err) {
			logrus.Debugf("Node password secret is not found for node %s", nodeName)
			return
		}
		logrus.Warnf("failed to delete old node password secret: %v", err)
	}
}

// handlerNoEtcd wraps a handler with an error message indicating that etcd is not deployed.
func handlerNoEtcd(handler http.Handler) http.Handler {
	r := mux.NewRouter().SkipClean(true)

	// Wildcard route for anything after /db/
	r.HandleFunc("/db/{_:.*}", func(resp http.ResponseWriter, r *http.Request) {
		util.SendError(errors.New("etcd datastore disabled"), resp, r, http.StatusBadRequest)
	})

	// Needs to come at the end, otherwise wildcard routes won't work
	r.NotFoundHandler = handler

	return r
}
Repository: k3s-io/k3s
File: pkg/cluster/managed.go (Go)

Code before:
		etcdProxy.Update(clientURLs)
		return false, nil
	})
}

// deleteNodePasswdSecret wipes out the node password secret after restoration
func (c *Cluster) deleteNodePasswdSecret(ctx context.Context) {
	nodeName := os.Getenv("NODE_NAME")
	secretsClient := c.config.Runtime.Core.Core().V1().Secret()
	if err := nodepassword.Delete(secretsClient, nodeName); err != nil {
		if apierrors.IsNotFound(err) {
			logrus.Debugf("Node password secret is not found for node %s", nodeName)
			return
		}
		logrus.Warnf("failed to delete old node password secret: %v", err)
	}
}

// handlerNoEtcd wraps a handler with an error message indicating that etcd is not deployed.
func handlerNoEtcd(handler http.Handler) http.Handler {
	r := mux.NewRouter().SkipClean(true)

	// Wildcard route for anything after /db/
    r.HandleFunc("/db/{_:.*}", func(resp http.ResponseWriter, r *http.Request) { 
        util.SendError(errors.New("etcd datastore disabled"), resp, r, http.StatusBadRequest)
    })

	// Needs to come at the end, otherwise wildcard routes won't work
	r.NotFoundHandler = handler

	return r
}


Review comment (suggestion):
inconsistent indentation
```suggestion
	// Wildcard route for anything after /db/
	r.HandleFunc("/db/{_:.*}", func(resp http.ResponseWriter, r *http.Request) { 
		util.SendError(errors.New("etcd datastore disabled"), resp, r, http.StatusBadRequest)
	})
```

Code after:
		etcdProxy.Update(clientURLs)
		return false, nil
	})
}

// deleteNodePasswdSecret wipes out the node password secret after restoration
func (c *Cluster) deleteNodePasswdSecret(ctx context.Context) {
	nodeName := os.Getenv("NODE_NAME")
	secretsClient := c.config.Runtime.Core.Core().V1().Secret()
	if err := nodepassword.Delete(secretsClient, nodeName); err != nil {
		if apierrors.IsNotFound(err) {
			logrus.Debugf("Node password secret is not found for node %s", nodeName)
			return
		}
		logrus.Warnf("failed to delete old node password secret: %v", err)
	}
}

// handlerNoEtcd wraps a handler with an error message indicating that etcd is not deployed.
func handlerNoEtcd(handler http.Handler) http.Handler {
	r := mux.NewRouter().SkipClean(true)

	// Wildcard route for anything after /db/
	r.HandleFunc("/db/{_:.*}", func(resp http.ResponseWriter, r *http.Request) {
		util.SendError(errors.New("etcd datastore disabled"), resp, r, http.StatusBadRequest)
	})

	// Needs to come at the end, otherwise wildcard routes won't work
	r.NotFoundHandler = handler

	return r
}
Repository: k3s-io/k3s
File: install.sh (Shell)

Code before:
create_symlinks() {
    [ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
    [ "${INSTALL_K3S_SYMLINK}" = skip ] && return

    for cmd in kubectl crictl ctr; do
        if [ ! -e ${BIN_DIR}/${cmd} ] || [ "${INSTALL_K3S_SYMLINK}" = force ]; then
            which_cmd=$(command -v ${cmd} 2>/dev/null || true)
            if [ -z "${which_cmd}" ] || [ "${INSTALL_K3S_SYMLINK}" = force ]; then
                info "Creating ${BIN_DIR}/${cmd} symlink to k3s"
                $SUDO ln -sf k3s ${BIN_DIR}/${cmd}
            else
                info "Skipping ${BIN_DIR}/${cmd} symlink to k3s, command exists in PATH at ${which_cmd}"
            fi
        else
            info "Skipping ${BIN_DIR}/${cmd} symlink to k3s, already exists"
        fi
    done
}

# --- create killall script ---
create_killall() {
    [ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
    info "Creating killall script ${KILLALL_K3S_SH}"
    $SUDO tee ${KILLALL_K3S_SH} >/dev/null << \EOF
#!/bin/sh
[ $(id -u) -eq 0 ] || exec sudo --preserve-env $0 $@

K3S_DATA_DIR=${K3S_DATA_DIR:-/var/lib/rancher/k3s}

for bin in ${K3S_DATA_DIR}/data/**/bin/; do
    [ -d $bin ] && export PATH=$PATH:$bin:$bin/aux
done

set -x

for service in /etc/systemd/system/k3s*.service; do
    [ -s $service ] && systemctl stop $(basename $service)
done

for service in /etc/init.d/k3s*; do
    [ -x $service ] && $service stop
done

pschildren() {
    ps -e -o ppid= -o pid= | \
    sed -e 's/^\s*//g; s/\s\s*/\t/g;' | \
    grep -w "^$1" | \
    cut -f2
}

pstree() {

Review comment (suggestion):
```suggestion
[ $(id -u) -eq 0 ] || exec sudo --preserve-env=K3S_DATA_DIR $0 $@
```

Code after:
            which_cmd=$(command -v ${cmd} 2>/dev/null || true)
            if [ -z "${which_cmd}" ] || [ "${INSTALL_K3S_SYMLINK}" = force ]; then
                info "Creating ${BIN_DIR}/${cmd} symlink to k3s"
                $SUDO ln -sf k3s ${BIN_DIR}/${cmd}
            else
                info "Skipping ${BIN_DIR}/${cmd} symlink to k3s, command exists in PATH at ${which_cmd}"
            fi
        else
            info "Skipping ${BIN_DIR}/${cmd} symlink to k3s, already exists"
        fi
    done
}

# --- create killall script ---
create_killall() {
    [ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
    info "Creating killall script ${KILLALL_K3S_SH}"
    $SUDO tee ${KILLALL_K3S_SH} >/dev/null << \EOF
#!/bin/sh
[ $(id -u) -eq 0 ] || exec sudo --preserve-env=K3S_DATA_DIR $0 $@

K3S_DATA_DIR=${K3S_DATA_DIR:-/var/lib/rancher/k3s}

for bin in ${K3S_DATA_DIR}/data/**/bin/; do
    [ -d $bin ] && export PATH=$PATH:$bin:$bin/aux
done

set -x

for service in /etc/systemd/system/k3s*.service; do
    [ -s $service ] && systemctl stop $(basename $service)
done

for service in /etc/init.d/k3s*; do
    [ -x $service ] && $service stop
done

pschildren() {
    ps -e -o ppid= -o pid= | \
    sed -e 's/^\s*//g; s/\s\s*/\t/g;' | \
    grep -w "^$1" | \
    cut -f2
}

pstree() {
    for pid in $@; do
        echo $pid
        for child in $(pschildren $pid); do
            pstree $child
        done
    done
Repository: k3s-io/k3s
File: install.sh (Shell)

Code before:
do_unmount_and_remove '/run/k3s'
do_unmount_and_remove '/var/lib/kubelet/pods'
do_unmount_and_remove '/var/lib/kubelet/plugins'
do_unmount_and_remove '/run/netns/cni-'

# Remove CNI namespaces
ip netns show 2>/dev/null | grep cni- | xargs -r -t -n 1 ip netns delete

remove_interfaces

rm -rf /var/lib/cni/
iptables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | iptables-restore
ip6tables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | ip6tables-restore
EOF
    $SUDO chmod 755 ${KILLALL_K3S_SH}
    $SUDO chown root:root ${KILLALL_K3S_SH}
}

# --- create uninstall script ---
create_uninstall() {
    [ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
    info "Creating uninstall script ${UNINSTALL_K3S_SH}"
    $SUDO tee ${UNINSTALL_K3S_SH} >/dev/null << EOF
#!/bin/sh
set -x
[ \$(id -u) -eq 0 ] || exec sudo --preserve-env \$0 \$@

K3S_DATA_DIR=\${K3S_DATA_DIR:-/var/lib/rancher/k3s}

${KILLALL_K3S_SH}

if command -v systemctl; then
    systemctl disable ${SYSTEM_NAME}
    systemctl reset-failed ${SYSTEM_NAME}
    systemctl daemon-reload
fi
if command -v rc-update; then
    rc-update delete ${SYSTEM_NAME} default
fi

rm -f ${FILE_K3S_SERVICE}
rm -f ${FILE_K3S_ENV}

remove_uninstall() {
    rm -f ${UNINSTALL_K3S_SH}
}
trap remove_uninstall EXIT

if (ls ${SYSTEMD_DIR}/k3s*.service || ls /etc/init.d/k3s*) >/dev/null 2>&1; then
    set +x; echo 'Additional k3s services installed, skipping uninstall of k3s'; set -x
    exit

Review comment (suggestion):
```suggestion
[ \$(id -u) -eq 0 ] || exec sudo --preserve-env=K3S_DATA_DIR \$0 \$@
```

Code after:
ip netns show 2>/dev/null | grep cni- | xargs -r -t -n 1 ip netns delete

remove_interfaces

rm -rf /var/lib/cni/
iptables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | iptables-restore
ip6tables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | ip6tables-restore
EOF
    $SUDO chmod 755 ${KILLALL_K3S_SH}
    $SUDO chown root:root ${KILLALL_K3S_SH}
}

# --- create uninstall script ---
create_uninstall() {
    [ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
    info "Creating uninstall script ${UNINSTALL_K3S_SH}"
    $SUDO tee ${UNINSTALL_K3S_SH} >/dev/null << EOF
#!/bin/sh
set -x
[ \$(id -u) -eq 0 ] || exec sudo --preserve-env=K3S_DATA_DIR \$0 \$@

K3S_DATA_DIR=\${K3S_DATA_DIR:-/var/lib/rancher/k3s}

${KILLALL_K3S_SH}

if command -v systemctl; then
    systemctl disable ${SYSTEM_NAME}
    systemctl reset-failed ${SYSTEM_NAME}
    systemctl daemon-reload
fi
if command -v rc-update; then
    rc-update delete ${SYSTEM_NAME} default
fi

rm -f ${FILE_K3S_SERVICE}
rm -f ${FILE_K3S_ENV}

remove_uninstall() {
    rm -f ${UNINSTALL_K3S_SH}
}
trap remove_uninstall EXIT

if (ls ${SYSTEMD_DIR}/k3s*.service || ls /etc/init.d/k3s*) >/dev/null 2>&1; then
    set +x; echo 'Additional k3s services installed, skipping uninstall of k3s'; set -x
    exit
fi

for cmd in kubectl crictl ctr; do
    if [ -L ${BIN_DIR}/\$cmd ]; then
        rm -f ${BIN_DIR}/\$cmd
    fi
Repository: k3s-io/k3s
File: pkg/vpn/vpn.go (Go)

Code before:

import (
	"encoding/json"
	"errors"
	"fmt"
	"net"
	"net/url"
	"strings"

	"github.com/k3s-io/k3s/pkg/util"

	pkgerrors "github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

const (
	tailscaleIf = "tailscale0"
)

type TailscaleOutput struct {
	TailscaleIPs []string `json:"TailscaleIPs"`
	BackendState string `json:"BackendState"`
}

type TailscalePrefsOutput struct {
	AdvertiseRoutes []string `json:"AdvertiseRoutes"`
}

// VPNInfo includes node information of the VPN. It is a general struct in case we want to add more vpn integrations
type VPNInfo struct {
	BackendState string
	IPv4Address  net.IP
	IPv6Address  net.IP
	NodeID       string
	ProviderName string
	VPNInterface string
}

// vpnCliAuthInfo includes auth information of the VPN. It is a general struct in case we want to add more vpn integrations
type vpnCliAuthInfo struct {
	Name             string
	JoinKey          string
	ControlServerURL string
	ExtraCLIFlags    []string
}

// StartVPN starts the VPN interface. General function in case we want to add more vpn integrations
func StartVPN(vpnAuthConfigFile string) error {
	authInfo, err := getVPNAuthInfo(vpnAuthConfigFile)
	if err != nil {
		return err

Review comment (suggestion):
Looking at upstream, this is Prefix from `net/netip` - we might match this in case the serialization changes?

https://github.com/tailscale/tailscale/blob/edb11e0e60ce702ebe62e7bfca345f167ac5efad/ipn/prefs.go#L199-L202

```suggestion
	AdvertiseRoutes []netip.Prefix `json:"AdvertiseRoutes"`
```

Code after:

import (
	"encoding/json"
	"errors"
	"fmt"
	"net"
	"net/netip"
	"net/url"
	"strings"

	"github.com/k3s-io/k3s/pkg/util"

	pkgerrors "github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

const (
	tailscaleIf = "tailscale0"
)

type TailscaleOutput struct {
	TailscaleIPs []string `json:"TailscaleIPs"`
	BackendState string `json:"BackendState"`
}

type TailscalePrefsOutput struct {
	AdvertiseRoutes []netip.Prefix `json:"AdvertiseRoutes"`
}

// VPNInfo includes node information of the VPN. It is a general struct in case we want to add more vpn integrations
type VPNInfo struct {
	BackendState string
	IPv4Address  net.IP
	IPv6Address  net.IP
	NodeID       string
	ProviderName string
	VPNInterface string
}

// vpnCliAuthInfo includes auth information of the VPN. It is a general struct in case we want to add more vpn integrations
type vpnCliAuthInfo struct {
	Name             string
	JoinKey          string
	ControlServerURL string
	ExtraCLIFlags    []string
}

// StartVPN starts the VPN interface. General function in case we want to add more vpn integrations
func StartVPN(vpnAuthConfigFile string) error {
	authInfo, err := getVPNAuthInfo(vpnAuthConfigFile)
	if err != nil {