Description of generic mount flow

generic_mount_flow.plantuml

@startuml

autonumber
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participant "wrapper\n(stage 2)" as wrapper
participant "stage 1" as stage_1
participant master
participant "rpc server" as rpc_server

wrapper -> stage_1 ** : spawn
activate stage_1
note over stage_1: prepare config
stage_1 -> wrapper: send config
deactivate stage_1

note over wrapper: create socket pair A
note over wrapper: create socket pair B
wrapper -> master ** : spawn
note over wrapper: close A[0]
activate master
note over master: close A[1]
note over master: close B[0]

wrapper -> rpc_server ** : spawn
note over rpc_server: close B[1]
note over wrapper: close B[0]
note over wrapper: close B[1]
activate rpc_server

master -> rpc_server: request open over B[1]
rpc_server -> master: send fd over B[0]
note over master: mount passing\nfd as option
master -> wrapper: send fd over A[0]

note over wrapper: enter stage 2
note over wrapper: start pre-process\nuse fd
note over wrapper: start process


@enduml

generic_mount_flow.svg