[CentOS] Roll a .src.rpm without physical build?

Hi,

 I got into a situation where a source rpm (.src.rpm)
file needs to be rolled but without build process
involved. 

 That is, I have a hacked version .spec file and a
tarball, and needs to roll these two files into a
.src.rpm file directly and send it out without build
it.

 Any one know the command(s) to fullfill it? Thanks.

--Guolin


       
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