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rvice-receive-secrets): Use it instead of raw 'format' calls. Ludovic Courtès 2020-09-29services: secret-service: Add initial client/server handshake....This allows the client running on the host to know when it's actually connect to the server running in the guest. Failing that, the client would connect right away to QEMU and send secrets even though the server is not running yet in the guest, which is unreliable. * gnu/build/secret-service.scm (secret-service-send-secrets): Add #:handshake-timeout. Read from SOCK an initial message from the server. Return #f on error. (secret-service-receive-secrets): Send 'secret-service-server' message to the client. Close SOCK upon timeout. * gnu/services/virtualization.scm (hurd-vm-shepherd-service): 'start' method returns #f when 'secret-service-send-secrets' returns #f. Ludovic Courtès 2020-09-29secret-service: Fix file port leak in 'secret-service-send-secrets'....* gnu/build/secret-service.scm (secret-service-send-secrets): Use 'call-with-input-file' instead of 'open-input-file'. Ludovic Courtès 2020-09-29secret-service: Add a timeout when waiting for a client....* gnu/build/secret-service.scm (secret-service-receive-secrets) [wait-for-client]: Call 'select' with a 60s timeout before 'accept'. Return #f upon timeout. [read-secrets]: Return FILES on success. Adjust caller of 'wait-for-client' to handle #f. Ludovic Courtès 2020-09-29secret-service: Clarify the origin of messages....* gnu/build/secret-service.scm (secret-service-send-secrets) (secret-service-receive-secrets): Prefix messages by "secret service". Ludovic Courtès 2020-09-01services: Add secret-service-type....This adds a "secret-service" that can be added to a Childhurd VM to receive out-of-band secrets (keys) sent from the host. Co-authored-by: Ludovic Courtès <ludo@gnu.org> * gnu/services/virtualization.scm (secret-service-activation): New procedure. (secret-service-type): New variable. * gnu/build/secret-service.scm: New file. * gnu/local.mk (GNU_SYSTEM_MODULES): Add it. Jan (janneke) Nieuwenhuizen