forked from cilium/cilium
/
bpf_sha_list.go
130 lines (113 loc) · 3.21 KB
/
bpf_sha_list.go
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// Copyright 2019 Authors of Cilium
//
// 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 cmd
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"github.com/cilium/cilium/common"
"github.com/cilium/cilium/pkg/command"
"github.com/cilium/cilium/pkg/defaults"
"github.com/spf13/cobra"
)
const (
shaTitle = "Datapath SHA"
endpointsTitle = "Endpoint(s)"
noSHA = "<No template used>"
brokenSHA = "<Template path invalid>"
)
var (
stateDir = filepath.Join(defaults.RuntimePath, defaults.StateDir)
templatesDir = filepath.Join(stateDir, defaults.TemplatesDir)
bpfTemplateListCmd = &cobra.Command{
Use: "list",
Aliases: []string{"ls"},
Short: "List BPF template objects.",
Run: func(cmd *cobra.Command, args []string) {
common.RequireRootPrivilege("cilium bpf sha list")
dumpShaList()
},
}
)
func init() {
bpfTemplateCmd.AddCommand(bpfTemplateListCmd)
command.AddJSONOutput(bpfTemplateListCmd)
}
func isEndpointID(name string) bool {
_, err := strconv.Atoi(name)
return err == nil
}
// getTemplateSHA returns the SHA that should be reported to the user for
// the specified endpoint ID.
func getTemplateSHA(epID string) string {
// Get symlink from endpointDir
templateSymlink := filepath.Join(stateDir, epID, defaults.TemplatePath)
f, err := os.Lstat(templateSymlink)
if err != nil {
return noSHA
}
if f.Mode()&os.ModeSymlink == 0 {
return brokenSHA
}
template, err := os.Readlink(templateSymlink)
if err != nil {
return brokenSHA
}
if f, err = os.Stat(template); err != nil {
return brokenSHA
}
return filepath.Base(filepath.Dir(template))
}
func dumpShaList() {
bpfTemplateList := make(map[string][]string)
// Find all templates
templateDirs, err := ioutil.ReadDir(templatesDir)
if err != nil {
Fatalf("failed to list template directory: %s\n", err)
}
for _, d := range templateDirs {
bpfTemplateList[d.Name()] = []string{}
}
// Find all endpoint usage of the templates
stateDirs, err := ioutil.ReadDir(stateDir)
if err != nil {
Fatalf("failed to list state directory: %s\n", err)
}
for _, d := range stateDirs {
if d.IsDir() && isEndpointID(d.Name()) {
epID := d.Name()
sha := getTemplateSHA(epID)
bpfTemplateList[sha] = append(bpfTemplateList[sha], epID)
}
}
if command.OutputJSON() {
if err := command.PrintOutput(bpfTemplateList); err != nil {
Fatalf("error getting output of map in JSON: %s\n", err)
}
return
}
// Mark unused templates with a "-" in text output
for sha, eps := range bpfTemplateList {
if len(eps) == 0 {
bpfTemplateList[sha] = []string{"-"}
}
}
if len(bpfTemplateList) == 0 {
fmt.Fprintf(os.Stderr, "No entries found.\n")
} else {
TablePrinter(shaTitle, endpointsTitle, bpfTemplateList)
}
}