fix#153
For now, just create the default remap user, rather than trying
to fix the command emulation. The existing code in docker is not
ideal, as it is GNU specific, try to find a better option for
1.13.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
The busybox adduser and addgroup commands are ignored by docker,
as it avoids symlinks, but they are not compatible so this is
kind of a good idea.
See https://github.com/docker/docker/blob/master/pkg/idtools/usergroupadd_linux.go
However, these do not yet deal with creating mapping ranges in /etc/subuid and
/etc/subgid, so initially we provide a set that match the default docker name
so at least docker daemon --userns-remap=default should work.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
