Cause: The blivet module on EL7 will try to use a function that is undefined when checking for mounts if there is a loop mount (/dev/loopX) on the system. The function is provided by the libblockdev-loop package but that isn't always installed. Consequence: The role will give an error like: "The function 'bd_loop_get_backing_file' called, but not implemented" Fix: Ensure that the libblockdev-loop package is installed if there are loop mounts on the EL7 system. Result: The role works on EL7 when there are loop mounts. Added a test to create a loop mount. Signed-off-by: Rich Megginson < rmeggins@redhat.com > ## Summary by Sourcery Ensure EL7 systems with loop mounts have the required libblockdev-loop package installed to prevent blivet errors and add coverage for loop-mount scenarios in tests. Bug Fixes: - Install libblockdev-loop on EL7 systems with detected loop mounts to avoid blivet calling an undefined bd_loop_get_backing_file function. Tests: - Add an integration test that creates a loop-backed mount, runs the storage role, and then cleans up the loop device and mount.