75 lines
1.6 KiB
Go
75 lines
1.6 KiB
Go
// docker_tls_args: find the docker daemon's tls args
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// This reimplements pgrep, because pgrep will only look in /proc, but not in
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// $PROCFS.
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package main
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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)
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func dockerTLSArgs(args []string) error {
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if len(args) > 0 {
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cmdUsage("docker-tls-args", "")
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}
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procRoot := os.Getenv("PROCFS")
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if procRoot == "" {
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procRoot = "/proc"
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}
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dirEntries, err := ioutil.ReadDir(procRoot)
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if err != nil {
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return err
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}
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for _, dirEntry := range dirEntries {
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dirName := dirEntry.Name()
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if _, err := strconv.Atoi(dirName); err != nil {
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continue
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}
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if comm, err := ioutil.ReadFile(filepath.Join(procRoot, dirName, "comm")); err != nil || string(comm) != "docker\n" {
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continue
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}
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cmdline, err := ioutil.ReadFile(filepath.Join(procRoot, dirName, "cmdline"))
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if err != nil {
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continue
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}
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isDaemon := false
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tlsArgs := []string{}
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args := bytes.Split(cmdline, []byte{'\000'})
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for i := 0; i < len(args); i++ {
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arg := string(args[i])
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switch {
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case arg == "-d" || arg == "daemon":
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isDaemon = true
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break
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case arg == "--tls", arg == "--tlsverify":
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tlsArgs = append(tlsArgs, arg)
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case strings.HasPrefix(arg, "--tls"):
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tlsArgs = append(tlsArgs, arg)
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if len(args) > i+1 &&
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!strings.Contains(arg, "=") &&
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!strings.HasPrefix(string(args[i+1]), "-") {
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tlsArgs = append(tlsArgs, string(args[i+1]))
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i++
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}
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}
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}
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if !isDaemon {
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continue
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}
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fmt.Println(strings.Join(tlsArgs, " "))
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return nil
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}
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return fmt.Errorf("cannot locate running docker daemon")
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}
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