1 files changed, 242 insertions, 0 deletions
diff --git a/vendor/github.com/go-git/go-billy/v5/helper/chroot/chroot.go b/vendor/github.com/go-git/go-billy/v5/helper/chroot/chroot.go
new file mode 100644
index 000000000..8b44e784b
--- /dev/null
+++ b/vendor/github.com/go-git/go-billy/v5/helper/chroot/chroot.go
@@ -0,0 +1,242 @@
+package chroot
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/go-git/go-billy/v5"
+	"github.com/go-git/go-billy/v5/helper/polyfill"
+)
+
+// ChrootHelper is a helper to implement billy.Chroot.
+type ChrootHelper struct {
+	underlying billy.Filesystem
+	base       string
+}
+
+// New creates a new filesystem wrapping up the given 'fs'.
+// The created filesystem has its base in the given ChrootHelperectory of the
+// underlying filesystem.
+func New(fs billy.Basic, base string) billy.Filesystem {
+	return &ChrootHelper{
+		underlying: polyfill.New(fs),
+		base:       base,
+	}
+}
+
+func (fs *ChrootHelper) underlyingPath(filename string) (string, error) {
+	if isCrossBoundaries(filename) {
+		return "", billy.ErrCrossedBoundary
+	}
+
+	return fs.Join(fs.Root(), filename), nil
+}
+
+func isCrossBoundaries(path string) bool {
+	path = filepath.ToSlash(path)
+	path = filepath.Clean(path)
+
+	return strings.HasPrefix(path, ".."+string(filepath.Separator))
+}
+
+func (fs *ChrootHelper) Create(filename string) (billy.File, error) {
+	fullpath, err := fs.underlyingPath(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	f, err := fs.underlying.Create(fullpath)
+	if err != nil {
+		return nil, err
+	}
+
+	return newFile(fs, f, filename), nil
+}
+
+func (fs *ChrootHelper) Open(filename string) (billy.File, error) {
+	fullpath, err := fs.underlyingPath(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	f, err := fs.underlying.Open(fullpath)
+	if err != nil {
+		return nil, err
+	}
+
+	return newFile(fs, f, filename), nil
+}
+
+func (fs *ChrootHelper) OpenFile(filename string, flag int, mode os.FileMode) (billy.File, error) {
+	fullpath, err := fs.underlyingPath(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	f, err := fs.underlying.OpenFile(fullpath, flag, mode)
+	if err != nil {
+		return nil, err
+	}
+
+	return newFile(fs, f, filename), nil
+}
+
+func (fs *ChrootHelper) Stat(filename string) (os.FileInfo, error) {
+	fullpath, err := fs.underlyingPath(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	return fs.underlying.Stat(fullpath)
+}
+
+func (fs *ChrootHelper) Rename(from, to string) error {
+	var err error
+	from, err = fs.underlyingPath(from)
+	if err != nil {
+		return err
+	}
+
+	to, err = fs.underlyingPath(to)
+	if err != nil {
+		return err
+	}
+
+	return fs.underlying.Rename(from, to)
+}
+
+func (fs *ChrootHelper) Remove(path string) error {
+	fullpath, err := fs.underlyingPath(path)
+	if err != nil {
+		return err
+	}
+
+	return fs.underlying.Remove(fullpath)
+}
+
+func (fs *ChrootHelper) Join(elem ...string) string {
+	return fs.underlying.Join(elem...)
+}
+
+func (fs *ChrootHelper) TempFile(dir, prefix string) (billy.File, error) {
+	fullpath, err := fs.underlyingPath(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	f, err := fs.underlying.(billy.TempFile).TempFile(fullpath, prefix)
+	if err != nil {
+		return nil, err
+	}
+
+	return newFile(fs, f, fs.Join(dir, filepath.Base(f.Name()))), nil
+}
+
+func (fs *ChrootHelper) ReadDir(path string) ([]os.FileInfo, error) {
+	fullpath, err := fs.underlyingPath(path)
+	if err != nil {
+		return nil, err
+	}
+
+	return fs.underlying.(billy.Dir).ReadDir(fullpath)
+}
+
+func (fs *ChrootHelper) MkdirAll(filename string, perm os.FileMode) error {
+	fullpath, err := fs.underlyingPath(filename)
+	if err != nil {
+		return err
+	}
+
+	return fs.underlying.(billy.Dir).MkdirAll(fullpath, perm)
+}
+
+func (fs *ChrootHelper) Lstat(filename string) (os.FileInfo, error) {
+	fullpath, err := fs.underlyingPath(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	return fs.underlying.(billy.Symlink).Lstat(fullpath)
+}
+
+func (fs *ChrootHelper) Symlink(target, link string) error {
+	target = filepath.FromSlash(target)
+
+	// only rewrite target if it's already absolute
+	if filepath.IsAbs(target) || strings.HasPrefix(target, string(filepath.Separator)) {
+		target = fs.Join(fs.Root(), target)
+		target = filepath.Clean(filepath.FromSlash(target))
+	}
+
+	link, err := fs.underlyingPath(link)
+	if err != nil {
+		return err
+	}
+
+	return fs.underlying.(billy.Symlink).Symlink(target, link)
+}
+
+func (fs *ChrootHelper) Readlink(link string) (string, error) {
+	fullpath, err := fs.underlyingPath(link)
+	if err != nil {
+		return "", err
+	}
+
+	target, err := fs.underlying.(billy.Symlink).Readlink(fullpath)
+	if err != nil {
+		return "", err
+	}
+
+	if !filepath.IsAbs(target) && !strings.HasPrefix(target, string(filepath.Separator)) {
+		return target, nil
+	}
+
+	target, err = filepath.Rel(fs.base, target)
+	if err != nil {
+		return "", err
+	}
+
+	return string(os.PathSeparator) + target, nil
+}
+
+func (fs *ChrootHelper) Chroot(path string) (billy.Filesystem, error) {
+	fullpath, err := fs.underlyingPath(path)
+	if err != nil {
+		return nil, err
+	}
+
+	return New(fs.underlying, fullpath), nil
+}
+
+func (fs *ChrootHelper) Root() string {
+	return fs.base
+}
+
+func (fs *ChrootHelper) Underlying() billy.Basic {
+	return fs.underlying
+}
+
+// Capabilities implements the Capable interface.
+func (fs *ChrootHelper) Capabilities() billy.Capability {
+	return billy.Capabilities(fs.underlying)
+}
+
+type file struct {
+	billy.File
+	name string
+}
+
+func newFile(fs billy.Filesystem, f billy.File, filename string) billy.File {
+	filename = fs.Join(fs.Root(), filename)
+	filename, _ = filepath.Rel(fs.Root(), filename)
+
+	return &file{
+		File: f,
+		name: filename,
+	}
+}
+
+func (f *file) Name() string {
+	return f.name
+}