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86d30f34b4
Heavy NOS containers (e.g. Cisco XRd) need /dev/shm larger than Docker's
64 MB default and host device nodes such as /dev/fuse. Add two opt-in
environment variables, consumed host-side and applied as native Docker
HostConfig keys at create time:
GNS3_SHM_SIZE (MB) -> HostConfig.ShmSize (bytes)
GNS3_DEVICES -> HostConfig.Devices in `docker run --device` syntax
(host[:container[:perm]]; Docker resolves major/minor
from the host node itself)
Native HostConfig (rather than remount/mknod inside init.sh) is used so this
works for vendor NOS nodes that skip init.sh (console_type=docker_exec) --
the path XRd must take, since GNS3's init.sh wrapper crashes XRd's glibc
loader. It applies whether or not init.sh runs, needs no schema/API/UI
change (reuses the `environment` field), and only takes effect when the vars
are set, so ordinary nodes keep default Docker behaviour.
GNS3_-prefixed user env vars stay dropped from the container environment
(only consumed here host-side), keeping GNS3-injected vars safe.