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n>Josselin Poiret 2022-03-16system: Improve 'read-boot-parameters' incompatibility diagnostic....Previously, when reading an incompatible "parameters" file, 'guix system' would print a warning and then crash with a wrong-type-arg backtrace because code expects 'read-boot-parameters' to always return a <boot-parameters> record. * gnu/system.scm (read-boot-parameters): Upon incompatibility, raise an error instead of returning #f. Also raise a '&fix-hint' condition. * tests/boot-parameters.scm ("read, construction, mandatory fields"): Define 'test-read-boot-parameters' as a macro; expect 'formatted-message?' exceptions rather than #f returns. Ludovic Courtès 2022-03-01system: Add a version field to the <boot-parameters> record....This version field exposes the (already present) version information of a boot parameters file. * gnu/system.scm (%boot-parameters-version): New variable. (<boot-parameters>)[version]: New field. (read-boot-parameters): Use it. (operating-system-boot-parameters-file): Likewise. * tests/boot-parameters.scm (test-read-boot-parameters): Use %boot-parameters-version as the default version value in the template. Maxim Cournoyer