1 files changed, 198 insertions, 0 deletions
diff --git a/vendor/github.com/projectatomic/buildah/secrets.go b/vendor/github.com/projectatomic/buildah/secrets.go
new file mode 100644
index 000000000..087bf6ba5
--- /dev/null
+++ b/vendor/github.com/projectatomic/buildah/secrets.go
@@ -0,0 +1,198 @@
+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)
+}