Add a -n option to pkg_create(1), to inhibit duplicate work.

When run without this option, multiple runs of `pkg_create -Rb' will
recreate common packages multiple times.  This can take a lot of time
for large packages.  With the -n option `pkg_create -b' checks with
stat(2) and skips packages that already exist.

Note that this may *not* be safe of the existing output file is not
really a package, or if it has been corrupted, modified or otherwise
tinkered with between subsequent pkg_create runs.  For this and POLA
reasons, the default behavior is to *rebuild* the packages, and the -n
option can be used when we know it is `safe' to run in no-regenerate
mode.

Inspired by:	A post to freebsd-questions
	 	by Matthias Apitz < matthias.apitz at oclc.org >
Reviewed by:	marcus, flz
Approved by:	marcus
MFC after:	2 weeks

0 files changed, 0 insertions, 0 deletions