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"""
Detect MDADM RAIDs
"""

import logging

import salt.utils.files

log = logging.getLogger(__name__)


def mdadm():
    """
    Return list of mdadm devices
    """
    devices = set()
    try:
        with salt.utils.files.fopen("/proc/mdstat", "r") as mdstat:
            for line in mdstat:
                line = salt.utils.stringutils.to_unicode(line)
                if line.startswith("Personalities : "):
                    continue
                if line.startswith("unused devices:"):
                    continue
                if " : " in line:
                    devices.add(line.split(" : ")[0])
    except OSError:
        return {}

    devices = sorted(devices)
    if devices:
        log.trace("mdadm devices detected: %s", ", ".join(devices))

    return {"mdadm": devices}