ENOEXEC with a credential helper about image

[mtrmac]

Thanks for your report.

That error suggests:

• That Podman does implement helpers, at least enough for this purpose; otherwise it wouldn’t even refer to the helper path.
• That the binary is somehow not executable by Go, or more likely by the kernel directly. Is it a shell script without a #! /? Are there SELinux failures? Is it executing exactly the same binary in the two situations? strace might help.

[Resisty]

Thanks for the reply!

#1: Fair enough; more precisely, podman does not correctly implement the docker credentials helper API; at the very least, it does not respect or understand the JSON output.
#2a: "the binary is somehow not executable by Go" I don't know how this would be the case, see below
#2b: "Is it a shell script without a #!" It is a shell script with a shebang.
#2c: "Are there SELinux failures?" There are no selinux failures.
#2d: "Is it executing exactly the same binary in the two situations?" Yes.

[mtrmac]

exec format error (= ENOEXEC) means the helper didn’t even start; it there isn’t any JSON output to get at that stage.

[mtrmac]

@Resisty did you manage to find the root cause? I’m afraid I’m not sure how to debug this any further from my side.

[Resisty]

@mtrmac sorry for forgetting about this; I'm not sure why this matters but I have to start the podman VM with -v $HOME:/mnt and everything proceeds as expected. The executable is under /usr/local/bin and is not a symlink, but for some reason this works.

[mtrmac]

Thanks. I really don’t understand how that works but it seems unrelated to c/image, and I’m happy you got it working.