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package server
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
rspec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// SecretData info
type SecretData struct {
Name string
Data []byte
}
// SaveTo saves secret data to given directory
func (s SecretData) SaveTo(dir string) error {
path := filepath.Join(dir, s.Name)
if err := os.MkdirAll(filepath.Dir(path), 0700); err != nil && !os.IsExist(err) {
return err
}
return ioutil.WriteFile(path, s.Data, 0700)
}
func readAll(root, prefix string) ([]SecretData, error) {
path := filepath.Join(root, prefix)
data := []SecretData{}
files, err := ioutil.ReadDir(path)
if err != nil {
if os.IsNotExist(err) {
return data, nil
}
return nil, err
}
for _, f := range files {
fileData, err := readFile(root, filepath.Join(prefix, f.Name()))
if err != nil {
// If the file did not exist, might be a dangling symlink
// Ignore the error
if os.IsNotExist(err) {
continue
}
return nil, err
}
data = append(data, fileData...)
}
return data, nil
}
func readFile(root, name string) ([]SecretData, error) {
path := filepath.Join(root, name)
s, err := os.Stat(path)
if err != nil {
return nil, err
}
if s.IsDir() {
dirData, err := readAll(root, name)
if err != nil {
return nil, err
}
return dirData, nil
}
bytes, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
return []SecretData{{Name: name, Data: bytes}}, nil
}
// getHostAndCtrDir separates the host:container paths
func getMountsMap(path string) (string, string, error) {
arr := strings.SplitN(path, ":", 2)
if len(arr) == 2 {
return arr[0], arr[1], nil
}
return "", "", errors.Errorf("unable to get host and container dir")
}
func getHostSecretData(hostDir string) ([]SecretData, error) {
var allSecrets []SecretData
hostSecrets, err := readAll(hostDir, "")
if err != nil {
return nil, errors.Wrapf(err, "failed to read secrets from %q", hostDir)
}
return append(allSecrets, hostSecrets...), nil
}
// secretMount copies the contents of host directory to container directory
// and returns a list of mounts
func secretMounts(defaultMountsPaths []string, mountLabel, containerWorkingDir string, runtimeMounts []rspec.Mount) ([]rspec.Mount, error) {
var mounts []rspec.Mount
for _, path := range defaultMountsPaths {
hostDir, ctrDir, err := getMountsMap(path)
if err != nil {
return nil, err
}
// skip if the hostDir path doesn't exist
if _, err := os.Stat(hostDir); os.IsNotExist(err) {
logrus.Warnf("%q doesn't exist, skipping", hostDir)
continue
}
ctrDirOnHost := filepath.Join(containerWorkingDir, ctrDir)
// skip if ctrDir has already been mounted by caller
if isAlreadyMounted(runtimeMounts, ctrDir) {
logrus.Warnf("%q has already been mounted; cannot override mount", ctrDir)
continue
}
if err := os.RemoveAll(ctrDirOnHost); err != nil {
return nil, fmt.Errorf("remove container directory failed: %v", err)
}
if err := os.MkdirAll(ctrDirOnHost, 0755); err != nil {
return nil, fmt.Errorf("making container directory failed: %v", err)
}
hostDir, err = resolveSymbolicLink(hostDir)
if err != nil {
return nil, err
}
data, err := getHostSecretData(hostDir)
if err != nil {
return nil, errors.Wrapf(err, "getting host secret data failed")
}
for _, s := range data {
s.SaveTo(ctrDirOnHost)
}
label.Relabel(ctrDirOnHost, mountLabel, false)
m := rspec.Mount{
Source: ctrDirOnHost,
Destination: ctrDir,
}
mounts = append(mounts, m)
}
return mounts, nil
}
func isAlreadyMounted(mounts []rspec.Mount, mountPath string) bool {
for _, mount := range mounts {
if mount.Destination == mountPath {
return true
}
}
return false
}
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