Beyond Linux® From Scratch (System V Edition) - Version r12.0-505

Chapter 12. System Utilities

Bubblewrap-0.8.0

Introduction to Bubblewrap

Bubblewrap is a setuid implementation of user namespaces, or sandboxing, that provides access to a subset of kernel user namespace features. Bubblewrap allows user owned processes to run in an isolated environment with limited access to the underlying filesystem.

[Note]

Note

Development versions of BLFS may not build or run some packages properly if LFS or dependencies have been updated since the most recent stable versions of the books.

Package Information

Bubblewrap Dependencies

Optional

libxslt-1.1.38 (to generate manual pages) and libseccomp-2.5.4 (built with python bindings, for tests)

Kernel Configuration

When this package began, upstream expected it could be installed suid-root. That was a long time ago, suid-root is generally considered a bad idea. As well as the default namespaces, this package requires the optional User namespace to be enabled. If that has not yet been enabled, select the following option in the kernel configuration and recompile the kernel: 

General setup --->
  -*- Namespaces support --->                                       [NAMESPACES]
    [*] User namespace                                                 [USER_NS]

Installation of Bubblewrap

Install Bubblewrap by running the following commands: 

mkdir build &&
cd    build &&

meson setup --prefix=/usr --buildtype=release .. &&
ninja

Next, if you desire to run the test suite, fix an issue caused by the merged-/usr configuration in LFS: 

sed 's@symlink usr/lib64@ro-bind-try /lib64@' -i ../tests/libtest.sh

To test the results, issue (as a user other than the root user): ninja test

Now, as the root user: 

ninja install

Command Explanations

--buildtype=release: Specify a buildtype suitable for stable releases of the package, as the default may produce unoptimized binaries.

Contents

Installed Program: bwrap
Installed Libraries: None
Installed Directories: None

Short Descriptions

bwrap

generates a sandbox for a program to run in