--runtime flag of docker run is ignored on Windows #50542
Description
Description
Docker ignores custom runtime that is specified when creating a container on Windows.
Reproduce
docker run --rm -it --runtime C:\path\to\custom\runtime.exe hello-world
Expected behavior
Custom runtime is used to run container.
docker version
Client:
Version: 27.5.1-rd
API version: 1.47
Go version: go1.22.11
Git commit: 0c97515
Built: Thu Jan 23 18:14:31 2025
OS/Arch: windows/amd64
Context: default
Server: Docker Engine - Community
Engine:
Version: 28.3.2
API version: 1.51 (minimum version 1.24)
Go version: go1.24.5
Git commit: e77ff99
Built: Wed Jul 9 15:41:13 2025
OS/Arch: windows/amd64
Experimental: falsedocker info
Client:
Version: 27.5.1-rd
Context: default
Debug Mode: false
Plugins:
buildx: Docker Buildx (Docker Inc.)
Version: v0.20.1
Path: C:\Program Files\Rancher Desktop\resources\resources\win32\docker-cli-plugins\docker-buildx.exe
compose: Docker Compose (Docker Inc.)
Version: v2.33.0
Path: C:\Program Files\Rancher Desktop\resources\resources\win32\docker-cli-plugins\docker-compose.exe
Server:
Containers: 1
Running: 0
Paused: 0
Stopped: 1
Images: 2
Server Version: 28.3.2
Storage Driver: windowsfilter
Windows:
Logging Driver: json-file
Plugins:
Volume: local
Network: ics internal l2bridge l2tunnel nat null overlay private transparent
Log: awslogs etwlogs fluentd gcplogs gelf json-file local splunk syslog
CDI spec directories:
/etc/cdi
/var/run/cdi
Swarm: inactive
Default Isolation: hyperv
Kernel Version: 10.0 26100 (26100.1.amd64fre.ge_release.240331-1435)
Operating System: Microsoft Windows Version 24H2 (OS Build 26100.4652)
OSType: windows
Architecture: x86_64
CPUs: 20
Total Memory: 63.71GiB
Name: MSI
ID: a30b884a-4857-4af9-b964-a52dab0590b9
Docker Root Dir: C:\ProgramData\docker
Debug Mode: false
Experimental: false
Insecure Registries:
::1/128
127.0.0.0/8
Live Restore Enabled: false
Product License: Community EngineAdditional Info
Problematic code is
Lines 11 to 15 in bf8b738
Path to runtime is available via Container.HostConfig.Runtime, but it is ignored.