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The virt-login-shell environment will be initialized with an arbitrary number of environment variables determined by the SSH daemon and PAM configuration. Most of these are not relevant inside the container, and at best they are noise and at worst they'll break apps. For example if XDG_RUNTIME_DIR is leaked to the container, it'll break any apps using it, since the directory it points to is only visible to the host OS filesystem, not the container FS. Use clearenv() to blank out everything and then set known good values for PATH, SHELL, USER, LOGNAME HOME and TERM. Everything else is left up to the login shell to initialize. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>