Ludovic Courtès 33b7cb7a59 services: Add 'provenance-service-type'. ...

* gnu/services.scm (object->pretty-string)
(channel->code, channel->sexp, provenance-file)
(provenance-entry): New procedures.
(provenance-service-type): New variable.
* gnu/system.scm (operating-system-with-provenance): New procedure.
* doc/guix.texi (Service Reference): Document 'provenance-service-type'.

2019-12-07 00:59:56 +01:00

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