toolchain/48854: build.sh should prevent multiple build/distribution/release operations

[martin%NetBSD.org@localhost]

>Number:         48854
>Category:       toolchain
>Synopsis:       build.sh should prevent multiple build/distribution/release 
>operations
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri May 30 20:30:00 +0000 2014
>Originator:     Martin Husemann
>Release:        NetBSD 6.99.43
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD night-owl.duskware.de 6.99.43 NetBSD 6.99.43 (NIGHT-OWL) #256: 
Mon May 26 09:45:23 CEST 2014 
martin%night-owl.duskware.de@localhost:/usr/src/sys/arch/amd64/compile/NIGHT-OWL
 amd64
Architecture: x86_64
Machine: amd64
>Description:

A build.sh invocation should maximally be able to cause one "make cleandir"
pass. Consider an invocation like:

   ./build.sh -U build release

which will do a cleandir, then a full build, then another cleandir and a
release build next. Quite wastefull.

Any of "build", "distribution" or "release" should only occur in 
${operations} exclusively.

>How-To-Repeat:
s/a

>Fix:
n/a