[DNM] debugging why mount doesn't work

[thaJeztah]

cd 29/cli

docker build -t cli .

docker run --rm cli sh -c 'mount 2>&1 | head -n1'

Testing on;

docker version
Client:
 Version:           29.1.4
 API version:       1.52
 Go version:        go1.25.5
 Git commit:        0e6fee6
 Built:             Thu Jan  8 19:55:54 2026
 OS/Arch:           darwin/arm64
 Context:           desktop-linux

Server: Docker Desktop 4.58.0 (215785)
 Engine:
  Version:          29.1.4
  API version:      1.52 (minimum version 1.44)
  Go version:       go1.25.5
  Git commit:       08440b6
  Built:            Thu Jan  8 19:57:28 2026
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          v2.2.1
  GitCommit:        dea7da592f5d1d2b7755e3a161be07f43fad8f75
 runc:
  Version:          1.3.4
  GitCommit:        v1.3.4-0-gd6d73eb8
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

Client:
 Version:    29.1.4
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  ai: Docker AI Agent - Ask Gordon (Docker Inc.)
    Version:  v1.17.1
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-ai
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.30.1-desktop.1
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v5.0.1
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-compose
  debug: Get a shell into any image or container (Docker Inc.)
    Version:  0.0.47
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-debug
  desktop: Docker Desktop commands (Docker Inc.)
    Version:  v0.2.0
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-desktop
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.31
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-extension
  hidden: Open a browser shell on the Docker Host. (thaJeztah)
    Version:  v0.0.1
    Path:     /Users/thajeztah/.docker/cli-plugins/docker-hidden
  init: Creates Docker-related starter files for your project (Docker Inc.)
    Version:  v1.4.0
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-init
  mcp: Docker MCP Plugin (Docker Inc.)
    Version:  v0.35.0
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-mcp
  model: Docker Model Runner (Docker Inc.)
    Version:  v1.0.7
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-model
  offload: Docker Offload (Docker Inc.)
    Version:  v0.5.41
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-offload
  pass: Docker Pass Secrets Manager Plugin (beta) (Docker Inc.)
    Version:  v0.0.22
    Path:     /Users/thajeztah/.docker/cli-plugins/docker-pass
  sandbox: Docker Sandbox (Docker Inc.)
    Version:  v0.6.0
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-sandbox
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-sbom
  scout: Docker Scout (Docker Inc.)
    Version:  v1.19.0
    Path:     /Applications/Docker.app/Contents/Resources/cli-plugins/docker-scout
  shell: Open a browser shell on the Docker Host. (thaJeztah)
    Version:  v0.0.1
    Path:     /Users/thajeztah/.docker/cli-plugins/docker-shell

Server:
 Containers: 9
  Running: 5
  Paused: 0
  Stopped: 4
 Images: 79
 Server Version: 29.1.4
 Storage Driver: overlayfs
  driver-type: io.containerd.snapshotter.v1
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 CDI spec directories:
  /etc/cdi
  /var/run/cdi
 Discovered Devices:
  cdi: docker.com/gpu=webgpu
 Swarm: active
  NodeID: n1rgi7t220c5lgsvwu2so3krr
  Is Manager: true
  ClusterID: 1zhzqbov3q3iwwp5hqx0y3ssz
  Managers: 1
  Nodes: 1
  Default Address Pool: 10.0.0.0/8
  SubnetSize: 24
  Data Path Port: 4789
  Orchestration:
   Task History Retention Limit: 5
  Raft:
   Snapshot Interval: 10000
   Number of Old Snapshots to Retain: 0
   Heartbeat Tick: 1
   Election Tick: 10
  Dispatcher:
   Heartbeat Period: 5 seconds
  CA Configuration:
   Expiry Duration: 3 months
   Force Rotate: 0
  Autolock Managers: false
  Root Rotation In Progress: false
  Node Address: 192.168.65.3
  Manager Addresses:
   192.168.65.3:2377
 Runtimes: runc io.containerd.runc.v2
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: dea7da592f5d1d2b7755e3a161be07f43fad8f75
 runc version: v1.3.4-0-gd6d73eb8
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.12.54-linuxkit
 Operating System: Docker Desktop
 OSType: linux
 Architecture: aarch64
 CPUs: 10
 Total Memory: 7.653GiB
 Name: docker-desktop
 ID: 67d8b0e8-acc4-42df-b0db-8979f3dd1699
 Docker Root Dir: /var/lib/docker
 Debug Mode: true
  File Descriptors: 197
  Goroutines: 419
  System Time: 2026-01-27T16:31:36.352504471Z
  EventsListeners: 13
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Labels:
  com.docker.desktop.address=unix:///Users/thajeztah/Library/Containers/com.docker.docker/Data/docker-cli.sock
 Experimental: false
 Insecure Registries:
  host.docker.internal:5002
  hubproxy.docker.internal:5555
  host.docker.internal:5001
  ::1/128
  127.0.0.0/8
 Live Restore Enabled: false
 Firewall Backend: iptables

[thaJeztah]

Ugh.. and on a Linux machine with docker v29.2, the "KO' ones ... work?

[tianon]

(closing per discussion in #572)

[thaJeztah]

Thx! Yeah, wasn't planning to get this one merged; just pushed it to share 😁❤️