Function createEtcFile

pkg/sentry/fsimpl/user/user_test.go:36–72

createEtcFile creates /etc/ with the given contents and mode. If mode is empty, then no file will be created. If mode is not a regular file mode, then contents is ignored.

(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, root vfs.VirtualDentry, contents string, mode linux.FileMode, filePath string)

// mode is empty, then no file will be created. If mode is not a regular file
// mode, then contents is ignored.
func createEtcFile(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, root vfs.VirtualDentry, contents string, mode linux.FileMode, filePath string) error {
	pop := vfs.PathOperation{
		Root:  root,
		Start: root,
		Path:  fspath.Parse("etc"),
	}
	if err := vfsObj.MkdirAt(ctx, creds, &pop, &vfs.MkdirOptions{
		Mode: 0755,
	}); err != nil && err != linuxerr.EEXIST { // Ignore error if it already exists.
		return fmt.Errorf("failed to create directory etc: %v", err)
	}

	pop = vfs.PathOperation{
		Root:  root,
		Start: root,
		Path:  fspath.Parse(filePath),
	}
	switch mode.FileType() {
	case 0:
		// Don't create anything.
		return nil
	case linux.S_IFREG:
		fd, err := vfsObj.OpenAt(ctx, creds, &pop, &vfs.OpenOptions{Flags: linux.O_CREAT | linux.O_WRONLY, Mode: mode})
		if err != nil {
			return err
		}
		defer fd.DecRef(ctx)
		_, err = fd.Write(ctx, usermem.BytesIOSequence([]byte(contents)), vfs.WriteOptions{})
		return err
	case linux.S_IFDIR:
		return vfsObj.MkdirAt(ctx, creds, &pop, &vfs.MkdirOptions{Mode: mode})
	case linux.S_IFIFO:
		return vfsObj.MknodAt(ctx, creds, &pop, &vfs.MknodOptions{Mode: mode})
	default:
		return fmt.Errorf("unknown file type %x", mode.FileType())
	}
}

// TestGetExecUserHome tests the getExecUserHome function.
func TestGetExecUserHome(t *testing.T) {