Re: sh -c 'whoami' gives permission error in docker container and puts me in weird prompt/subshell

[Michael Albinus]

ParetoOptimalDev <pareto.optimal@mailfence.com> writes:

Hi,

> This should
> work from any machine with docker and emacs 29+. Reminder that I'm using
> emacs 30.0.50.
>
> Also note I'm executing these steps and pasting them as I verify they are 
> valid
> from `emacs -Q` with emacs 30.0.50.

Thanks.

I'm on Fedora, so I have to use "podman" instead of "docker". But this
shouldn't make a difference.

> 1. Start `emacs -Q`
>
> 2. Start the alpine docker container using a specific tag by evaluating:
>
> (async-shell-command "docker run --name alpine3173 --rm -it alpine:3.17.3 sh" 
> "*docker run alpine sh*")
>
> 3. open dired in the alpine container
>
> C-x C-f /docker:root@alpine3173: RET
>
> 4. Open eshell with M-x eshell
>
> 5. Try to run any command that eshell does not implement which exists in
> the docker container's PATH.
>
> `chown` for instance:
>
> Welcome to the Emacs shell
>
> /docker:root@alpine3173:~ # chown
> ‘echo \"`uname -sr`\"’ does not return a valid Lisp expression: ‘sh: uname: 
> command not found
> ""
> ’

I have followed your steps by cut'n'paste (replacing "docker" with
"podman"). The result in the *eshell* buffer

--8<---------------cut here---------------start------------->8---
/podman:root@alpine3173:~ # chown
BusyBox v1.35.0 (2022-11-19 10:13:10 UTC) multi-call binary.

Usage: chown [-RhLHPcvf]... USER[:[GRP]] FILE...

Change the owner and/or group of FILEs to USER and/or GRP

        -h      Affect symlinks instead of symlink targets
        -L      Traverse all symlinks to directories
        -H      Traverse symlinks on command line only
        -P      Don't traverse symlinks (default)
        -R      Recurse
        -c      List changed files
        -v      Verbose
        -f      Hide errors
/podman:root@alpine3173:~ #
--8<---------------cut here---------------end--------------->8---

As expected. Please rerun your recipe, but start Emacs like

--8<---------------cut here---------------start------------->8---
emacs -Q -l tramp --eval '(setq tramp-verbose 10)'
--8<---------------cut here---------------end--------------->8---

When the chown command fails, send the complete Tramp debug buffer. I
must see what Eshell does.

Best regards, Michael.