Log Message:
mksandbox-1.2:

  * Mount /proc read-write on Linux, it appears to be required for e.g.
    groupadd to function correctly.

  * Add new --rodirs and --rwdirs options, which allow arbitrary lists
    of directories to be mounted appropriately inside the chroot.

  * Add --without-pkgsrc which prevents the default pkgsrc directories
    from being mounted.

This allows mksandbox to be easily used for chrooted pbulk setups, using
a simple invocation such as:

  mksandbox --without-pkgsrc --rodirs=/usr/pbulk --rwdirs=/shared /chroot