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def36c0444
Start the RHEL 7 run from a sysconfig carrying the shared-root value the previous script wrote, as on an already-deployed node, plus options from the stock RHEL 7 file. Assert that exactly one root= remains, that it points at the node subdirectory, that rd.neednet=1 and rootflags=nofail survive, and that a second run leaves KDUMP_COMMANDLINE_APPEND unchanged. Against the previous prepend-only sed the count and idempotency assertions fail: the legacy root= survives as the last token, which is the one dracut honors.