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7c58fc17f7
Mount a read-write overlay directory over the build context directory to restore the ability to use it as a covert cache of sorts during the lifetime of each platform's build, but in a way that still ensures that we don't modify the real build context directory. N.B.: builds where FROM in one stage referenced a relative path which had been written to a bind-mounted default build context directory by an earlier stage broke when we started making those bind mounts into overlays to prevent/discard modifications to that directory, and while this extends the lifetime of that overlay so that it's consistent throughout the build, those relative path names are still going to point to the wrong location. Since we need to determine SELinux labeling before mounting the overlay, go ahead and calculate the labels to use before creating the first builder, and remove the logic that had whichever stage thought it was the first one set them in its parent object for use by other stages, in what was probably a racey way. Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>