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package buildah
import (
"bufio"
"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"
)
var (
// DefaultMountsFile holds the default mount paths in the form
// "host_path:container_path"
DefaultMountsFile = "/usr/share/containers/mounts.conf"
// OverrideMountsFile holds the default mount paths in the form
// "host_path:container_path" overriden by the user
OverrideMountsFile = "/etc/containers/mounts.conf"
)
// secretData stores the name of the file and the content read from it
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
}
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
}
func getMounts(filePath string) []string {
file, err := os.Open(filePath)
if err != nil {
logrus.Warnf("file %q not found, skipping...", filePath)
return nil
}
defer file.Close()
scanner := bufio.NewScanner(file)
if err = scanner.Err(); err != nil {
logrus.Warnf("error reading file %q, skipping...", filePath)
return nil
}
var mounts []string
for scanner.Scan() {
mounts = append(mounts, scanner.Text())
}
return mounts
}
// 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")
}
// secretMount copies the contents of host directory to container directory
// and returns a list of mounts
func secretMounts(filePath, mountLabel, containerWorkingDir string) ([]rspec.Mount, error) {
var mounts []rspec.Mount
defaultMountsPaths := getMounts(filePath)
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)
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 {
if err := s.saveTo(ctrDirOnHost); err != nil {
return nil, errors.Wrapf(err, "error saving data to container filesystem on host %q", ctrDirOnHost)
}
}
err = label.Relabel(ctrDirOnHost, mountLabel, false)
if err != nil {
return nil, errors.Wrap(err, "error applying correct labels")
}
m := rspec.Mount{
Source: ctrDirOnHost,
Destination: ctrDir,
Type: "bind",
Options: []string{"bind"},
}
mounts = append(mounts, m)
}
return mounts, nil
}
// resolveSymbolicLink resolves a possbile symlink path. If the path is a symlink, returns resolved
// path; if not, returns the original path.
func resolveSymbolicLink(path string) (string, error) {
info, err := os.Lstat(path)
if err != nil {
return "", err
}
if info.Mode()&os.ModeSymlink != os.ModeSymlink {
return path, nil
}
return filepath.EvalSymlinks(path)
}
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