Passing 'platform' to Docker daemon?

[chuckyz]

I run a mac M1 machine today and find that docker and footloose themselves run really well within lima (https://github.com/lima-vm/lima).

My workflow today is using https://github.com/lima-vm/lima/blob/master/docs/multi-arch.md to build/run x86 containers via nerdctl within lima.

I'm trying to see if I can run a footloose container using x86 translation within a lima VM, and hoping this is something trivial.

[chuckyz]

I was able to create/exec into a container using the following patch:

diff --git a/pkg/cluster/cluster.go b/pkg/cluster/cluster.go
index 0b46f85..b6b836d 100644
--- a/pkg/cluster/cluster.go
+++ b/pkg/cluster/cluster.go
@@ -328,6 +328,10 @@ func (c *Cluster) createMachineRunArgs(machine *Machine, name string, i int) []s
                runArgs = append(runArgs, "--privileged")
        }

+       if (machine.spec.Platform != "") {
+               runArgs = append(runArgs, "--platform", machine.spec.Platform)
+       }
+
        if len(machine.spec.Networks) > 0 {
                network := machine.spec.Networks[0]
                log.Infof("Connecting %s to the %s network...", name, network)
diff --git a/pkg/config/machine.go b/pkg/config/machine.go
index d51bea4..b87e35e 100644
--- a/pkg/config/machine.go
+++ b/pkg/config/machine.go
@@ -73,6 +73,7 @@ type Machine struct {
        Backend string `json:"backend,omitempty"`
        // Ignite specifies ignite-specific options
        Ignite *Ignite `json:"ignite,omitempty"`
+       Platform string `json:"platform,omitempty"`
 }

 func (m *Machine) IgniteConfig() Ignite {

I then ran ./footloose create, set platform, and ./footloose start and got a container, but things like ssh don't work and while init is there, it doesn't seem to be doing very much.

This is the following used config:

cluster:
  name: cluster
  privateKey: cluster-key
machines:
- count: 1
  spec:
    platform: "amd64"
    backend: docker
    image: quay.io/footloose/centos7:latest
    name: node%d
    portMappings:
    - containerPort: 22

root@lima-default:/footloose# docker exec -it 9c902ebe6325 /bin/bash
[root@node0 /]# uname -a
Linux node0 5.13.0-44-generic #49-Ubuntu SMP Wed May 18 13:33:01 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
[root@node0 /]# ps faux
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root          49  0.7  0.3 161336 12772 pts/1    Ssl  17:57   0:00 /usr/bin/qemu-x86_64 /bin/bash /bin/bash
root          81  0.0  0.2 200748  9764 ?        Rl+  Jun24   0:00  \_ ps faux
root           1  0.0  0.2 191296  9148 pts/0    Ssl+ 17:55   0:00 /usr/bin/qemu-x86_64 /sbin/init /sbin/init

This doesn't seem to line up with the tutorial though. Wondering if anyone else has gone down this road yet?