def __check_and_fix_rootfs()

in rd-agent/src/misc/sideloader.py [0:0]

• 21 lines of code
• 9 McCabe index (conditional complexity)

    def __check_and_fix_rootfs(self):
        toks = None
        for line in read_lines("/proc/mounts"):
            toks = line.split()
            if toks[1] == "/":
                break

        if toks is None or toks[1] != "/":
            return ["failed to find root fs mount entry"]

        if toks[2] != "btrfs":
            return ["root filesystem is not btrfs"]

        if "discard=async" in toks[3]:
            return []

        fixed = ""
        if self.fix:
            try:
                subprocess.check_call(["mount", "-o", "remount,discard=async", "/"])
            except Exception as e:
                return [f"failed to enable async discard on root fs ({e})"]

            self.fixed = True
            fixed = ", enabled"

        return [f"async discard disabled on root fs{fixed}"]