push to insecure registry (panic: runtime error: index out of range [0] with length 0)

[cmdjulian]

I would like to use rootless buildkit in a Kubernetes Job and trying to use the provided rootless template from the examples folder.
Build works greate, but pushing fails with:

#10 ERROR: failed to do request: Head "https://registry-svc:5000/v2/foo/blobs/sha256:0443cbc5100eb115b6787f6233e4b00a731a6609c62a07a509bdb43083e61f55": http: server gave HTTP response to HTTPS client
------
 > importing cache manifest from registry-svc:5000/foo:latest:
------
------
 > exporting to image:
------
error: failed to solve: failed to do request: Head "https://registry-svc:5000/v2/foo/blobs/sha256:0443cbc5100eb115b6787f6233e4b00a731a6609c62a07a509bdb43083e61f55": http: server gave HTTP response to HTTPS client

I then stumbled upon #2044 and used the mentioned approach mounting a buildkit.toml file. My .toml file looks like this:

debug = false
[worker.containerd]
  namespace = "buildkit"
[registry."registry-svc:5000"]
  http = true
  insecure = true

It is mounted under /home/user/.config/buildkit/buildkit.toml.

However this results in the following error:

could not connect to unix:///run/user/1000/buildkit/buildkitd.sock after 10 trials
========== log ==========
panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
main.main()
	/src/cmd/buildkitd/main.go:167 +0x13cc
[rootlesskit:child ] error: command [buildkitd --oci-worker-no-process-sandbox --addr=unix:///run/user/1000/buildkit/buildkitd.sock] exited: exit status 2
[rootlesskit:parent] error: child exited: exit status 2
sh: can't kill pid 9: No such process

Any idea what I might do wrong?

[tonistiigi]

buildkit/cmd/buildkitd/main.go

Line 378 in 1725efc

return cfg, nil

seems like the likely issue. You get some error when loading the config(maybe EPERM) and we don't seem to handle it properly.

@AkihiroSuda Any idea what the PathError check was about https://github.com/moby/buildkit/pull/896/files#diff-fb243a9185f7d24f7bfdf25097d6128f1b29b1a304bfc13d360667f8358551f6R299 ? Somewhat confused about the intent in here.