K 10
svn:author
V 3
gjb
K 8
svn:date
V 27
2014-04-18T15:46:43.409266Z
K 7
svn:log
V 624
Add a _chroot() helper function which evaluates TGTISCHROOT.
If TGTISCHROOT is set to a non-empty value, command arguments
are run through chroot(8), otherwise are run directly without
chroot(8).

Add a few additional variables:
  o RELDIR:  the directory the result from 'make install' in
             the release/ directory.
  o EC2DIR:  the work directory for the EC2 image build.
  o EC2IMG:  the md(4) backing file for the image build.
  o EC2SIZE: the size of the image to create.

Add some functionality to diskbuild() to create the md(4)
backing file, and destroy it when done.

Sponsored by:	The FreeBSD Foundation

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