acbab8697e
And modernize heavily while doing so. Fixes: #21787 (Strictly speaking, this leaves a race window open: the the system is powered off in the short interval when we linked in the prepared hwdb file into the dir under a temporary name and are about to rename it to the final name, then the file might be left over after all. But this minimizes the window so much that this shouldn't be an issue in real-life. Key after all is that with this change we'll build up the hwdb file under O_TMPFILE, and thus are robust to power loss during the slow operation)
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