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losetup -f returns the next free loop device, which may not be /dev/loop0. If you blindly follow the readmy you may end up destroying an existing device. Make it more robust with a variable to store the loop device. Signed-off-by: Cherniaev Andrei <dungeonlords789@naver.com> [Arnout: keep the actual losetup atomic] Signed-off-by: Arnout Vandecappelle <arnout@mind.be>