musicfs-server (gRPC) runs inside an Incus VM, live-sharing the host's ~/Music as a readonly virtiofs mount. scripts/vm.sh builds the binary on the host, bundles its nix glibc so it runs unmodified in the VM, ships it in, and runs it under systemd.

Setup

devenv shell        # cargo, incus, patchelf, grpcurl
scripts/vm.sh up    # create VM, share ~/Music, build, ship, start server

Options (env): VM_NAME, IMAGE, MUSIC_SOURCE, LISTEN_PORT, RUST_LOG.

Command	Action
`scripts/vm.sh up`	create + build + ship + start
`scripts/vm.sh redeploy`	rebuild after a code change
`scripts/vm.sh logs`	tail server logs
`scripts/vm.sh status`	VM + service status
`scripts/vm.sh shell`	shell inside the VM
`scripts/vm.sh down`	stop the VM
`scripts/vm.sh destroy`	delete the VM

Test it (Nushell)

let VMIP = (incus list musicfs -f csv -c 4 | lines | first | split row " " | first)
let ADDR = $"($VMIP):50051"

# liveness
^nc -z -w 3 $VMIP 50051
if $env.LAST_EXIT_CODE == 0 { print "alive" } else { print "dead" }

# gRPC: stream the manifest, count entries
grpcurl -plaintext -import-path proto -proto musicfs.proto -d "{}" $ADDR musicfs.MusicFs/GetManifest | lines | find relPath | length

# files the server scans
incus exec musicfs -- find /music -type f | lines | length

# play a track straight out of the VM's shared /music
incus exec musicfs -- cat "/music/DDT/ДДТ - Творчество в пустоте – 2 - 01 Intro.flac" | ^mpv -

Reach the server at the VM's bridge IP (scripts/vm.sh status prints it). Install mpv with nix profile install nixpkgs#mpv, or use ^ffplay - instead.

In Nushell, always put | lines between an external command's stdout and a builtin (find, first, length, …); external-to-external pipes (cat | mpv) are byte-stable and don't need it.