8d89667aba
This makes sd_device_get_sysattr_value()/sd_device_set_sysattr_value() refuse to read/write files outside of sysfs for safety. Also this makes - use chase() to resolve and open the symlink in path to sysfs attribute, - use delete_trailing_chars(), - include error code in cache entry, so we can cache more error cases, - refuse caching value written to uevent file of any devices, i.e. sd_device_set_sysattr_value(dev, "../uevent", "add") will also not cache the value "add".
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