func creates new container but doesn't run it, found a solution

[paulzhn]

To be brief, sudo could solve this problem, and it's highly likely not a func problem. I am writing this to provide a solution.

I'm using func v0.42.1 and when I try to build a function, it always hangs. I can see that a new container has been created, but not starts with docker ps -a:

And if I use func build -v, the output is below:

Building function image
Pulling image ghcr.io/knative/builder-jammy-tiny:0.0.240
0.0.240: Pulling from knative/builder-jammy-tiny
Digest: sha256:821791b42f74d8672304c8d27f227d2f9582638b048954a531f66d36465043e0
Status: Image is up to date for ghcr.io/knative/builder-jammy-tiny:0.0.240
CheckReadAccess succeeded for the run image index.docker.io/paketobuildpacks/run-jammy-tiny:latest
Selected run image index.docker.io/paketobuildpacks/run-jammy-tiny:latest
Pulling image index.docker.io/paketobuildpacks/run-jammy-tiny:latest with platform linux/amd64
latest: Pulling from paketobuildpacks/run-jammy-tiny
Digest: sha256:fac4a3749284e198247f4ead26fd8ee2816c4db428ebb44fbfd19e6fef6309dc
Status: Image is up to date for paketobuildpacks/run-jammy-tiny:latest
Creating builder with the following buildpacks:
-> paketo-community/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-community/[email protected]
-> paketo-community/[email protected]
-> paketo-community/[email protected]
-> [email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
-> paketo-buildpacks/[email protected]
Using build cache volume pack-cache-hello_latest-19949441c76b.build
Running the creator on OS linux from image pack.local/builder/6f676f6c747a62787761:latest with:
Container Settings:
  Args: /cnb/lifecycle/creator -daemon -launch-cache /launch-cache -log-level debug -app /workspace -cache-dir /cache -run-image index.docker.io/paketobuildpacks/run-jammy-tiny:latest -gid 0 -uid 0 registry.cn-hangzhou.aliyuncs.com/hello:latest
  System Envs: CNB_PLATFORM_API=0.13
  Image: pack.local/builder/6f676f6c747a62787761:latest
  User: root
  Labels: map[author:pack]
Host Settings:
  Binds: pack-cache-hello_latest-19949441c76b.build:/cache /var/run/docker.sock:/var/run/docker.sock pack-cache-hello_latest-19949441c76b.launch:/launch-cache pack-layers-biysoqvcvd:/layers pack-app-bajmwrqrmb:/workspace
  Network Mode: host

and then it hangs forever.

I downloaded the code, debugged it by line, and found it hung at docker/client/request.go:69

I think the problem might be, that if you don't have permission, you cannot send the request to the docker socket. But the container can be created, so I'm not sure if my guess is true.