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package secrets
import (
"bufio"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/containers/storage/pkg/chrootarchive"
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" overridden by the user
OverrideMountsFile = "/etc/containers/mounts.conf"
)
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")
}
// SecretMounts 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)
}
// In the event of a restart, don't want to copy secrets over again as they already would exist in ctrDirOnHost
_, err = os.Stat(ctrDirOnHost)
if os.IsNotExist(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
}
if err = chrootarchive.NewArchiver(nil).CopyWithTar(hostDir, ctrDirOnHost); err != nil && !os.IsNotExist(err) {
return nil, errors.Wrapf(err, "error getting host secret data")
}
err = label.Relabel(ctrDirOnHost, mountLabel, false)
if err != nil {
return nil, errors.Wrap(err, "error applying correct labels")
}
} else if err != nil {
return nil, errors.Wrapf(err, "error getting status of %q", ctrDirOnHost)
}
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)
}
|
