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Detect kernel version before swap file creation (#428)
According to man page `man 8 swapon', "Preallocated swap files are supported on XFS since Linux 4.18". This patch checks for kernel version before attepting to create swapfile, using dd for XFS only on kernel versions <= 4.18 or btrfs. Add new func util.kernel_version which returns a tuple of ints (major, minor) Signed-off-by: Eduardo Otubo otubo@redhat.com
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