Description of problem:
When you add an ignoredisk option (ignoredisk --only-use=sda,cciss/c0d0) to a kickstart that also contains "clearpart --all --initlabel", it causes anaconda to fail to skip read-only media (ie, CD-ROM devices) and prompts for human interaction during, which should be, an automated install.

Version-Release number of selected component (if applicable):
anaconda 11.1.2.224

Additional info:

It looks like the problem code lives in partedUtils.py:

        for drive in self.driveList():
            # ignoredisk takes precedence over clearpart (#186438).
            if (DiskSet.exclusiveDisks != [] and drive not in DiskSet.exclusiveDisks) or drive in DiskSet.skippedDisks:
                continue
            deviceFile = isys.makeDevInode(drive, "/dev/" + drive)
            if not isys.mediaPresent(drive) or isys.deviceIsReadOnly(drive):
                self._removeDisk(drive)
                continue