[PATCH] add --copyin and --copyout to mock.

[Clark Williams]

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Attached is a patch that adds the --copyin and --copyout options to mock. These
options allow people to add to a chroot and to pull files out of a chroot, without
having to know the path to the chroot.

Usage:

	mock -r <config> --copyin foo bar baz /tmp

copies the files foo, bar and baz to the chroot /tmp directory for <config>

	mock -r <config> --copyout /tmp/result.txt /opt/mydir/something ./results

copies the files <chroot>/tmp/result.txt and <chroot>/opt/mydir/something into the
local dir ./results.

In the process of doing this I was bitten by os.path.join()'s "intelligent behavior",
in that when using it to do a copyin, it would refuse to join two absolute paths.
While coming up with a utility function to do what I wanted, Michael saw that we were
manipulating the self.rootdir a bit haphazardly and we arrived at makeChrootPath() as
a method in the Root object. I then did a first cut at replacing ad hoc usage of
self.rootdir with self.makeChrootPath().

Unless someone objects strenuously, I'll commit this tonight.

Clark
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