`failed to attach to the container: failed to open stdout fifo: error creating fifo binary:///usr/local/bin/nerdctl?_NERDCTL_INTERNAL_LOGGING=%2Fvar%2Flib%2Fnerdctl%2F1935db59: no such file or directory`

^{Originally posted by **haytok** March 13, 2024}
## Question

If we try to attach to a container that has been started as shown below, the following error will occur.

```bash
[haytok@lima-finch workspace]$ sudo nerdctl run --name test -d alpine sh -c "while true; do echo /'Hello, world/'; sleep 1; done"
54f605cda9b8184a5d16a543ba482dfaa1a90d3e71d9903c19b667bd202f5b18
[haytok@lima-finch workspace]$ sudo nerdctl ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
54f605cda9b8 docker.io/library/alpine:latest "sh -c while true; d…" 3 seconds ago Up test
[haytok@lima-finch workspace]$ sudo nerdctl attach test
FATA[0000] failed to attach to the container: failed to open stdout fifo: error creating fifo binary:///usr/local/bin/nerdctl?_NERDCTL_INTERNAL_LOGGING=%2Fvar%2Flib%2Fnerdctl%2F1935db59: no such file or directory
```

Is this the expected behavior?

There seems to be an error in the following part of nerdctl, but I'm in trouble because I don't know how to fix it.

- https://github.com/containerd/nerdctl/blob/main/pkg/cmd/container/attach.go#L96C1-L99C3
- https://github.com/containerd/nerdctl/blob/9ce158bb9a259a999a33db54b43119ee36e50569/pkg/cioutil/container_io_unix.go#L122

Note that Docker doesn't cause such an error, and we can attach it to a container.

## Environments

I'm using the following versions of containerd and nerdctl.

```bash
[haytok@lima-finch workspace]$ containerd --version
containerd github.com/containerd/containerd v1.7.13 7c3aca7a610df76212171d200ca3811ff6096eb8
[haytok@lima-finch workspace]$ nerdctl version
WARN[0000] failed to inspect the rootless containerd socket address error="stat /run/user/504/containerd-rootless: no such file or directory"
Client:
Version: v1.7.3
OS/Arch: linux/amd64
Git commit: 0a464409d0178e16d3d2bed36222937ec3fc9c77
buildctl:
Version: v0.12.5
GitCommit: bac3f2b673f3f9d33e79046008e7a38e856b3dc6
```

Note that containerd and nerdctl are running in Lima launched from Finch.