tree 142c3e891b024f32a5fc8076e2bcecd7c9959f44
parent 1150450d3bab1b83b7886061bfc41ffa7b339894
author Ankur <ataly@google.com> 1424204237 -0800
committer Ankur <ataly@google.com> 1424204345 -0800

TBR: "core/veyron/lib/shell": Setting child principal

Currently the shell sets up the principal for all child processes
it starts and blesses it with the principal that the shell was
started with. This logic however is too complicated and in some cases
leads to the child principal getting multiple copies of the same
blessings.

This CL simplifies the logic so that a child principal only receives
blessings derived from the default blessings of the shell's principal.
These blessings are marked as default and shareable with everyone.

The shell's principal is determined as follows.
sh := NewShell(ctx, p)
If p != nil then sh.principal is p otherwise sh.principal is
veyron2.GetPrincipal(ctx).

MultiPart: 1/2

Change-Id: Ia72a05895892e7ce17111afb30ce3f3d1b4db404