universal image error: "mount: /tmp: permission denied"

[tomatebeans]

Tried to use the universal image inside .devcontainer but got the error.

Then I tried to run the universal image independently but I still get the error: mount: /tmp: permission denied.

Sample of the command I tried: docker run -it --rm mcr.microsoft.com/vscode/devcontainers/universal bash

seems error is addressed by --privileged but maybe not the solution

go image does not have the same error:

edit: seems weird that there is /home/codespace instead of /home/vscode

root ➜ / $ cat /etc/passwd
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
_apt:x:100:65534::/nonexistent:/usr/sbin/nologin
systemd-timesync:x:101:101:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologin
systemd-network:x:102:103:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin
systemd-resolve:x:103:104:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin
messagebus:x:104:105::/nonexistent:/usr/sbin/nologin
codespace:x:1000:1000::/home/codespace:/bin/bash                  <------------------------------------
sshd:x:105:65534::/run/sshd:/usr/sbin/nologin
root ➜ / $ ls /home
codespace                                  <------------------------------------
root ➜ / $

[samruddhikhandale]

Hi @tomatebeans,

seems error is addressed by --privileged but maybe not the solution

The universal image uses docker-in-docker , hence, it needs the --privileged flag to run.
Context - https://docs.docker.com/engine/reference/commandline/run/#full-container-capabilities---privileged

go image does not have the same error:

Yes, you are right because the go image does not use docker-in-docker 😄

edit: seems weird that there is /home/codespace instead of /home/vscode

The universal image is used by default by GitHub Codespaces, that's the reason for having /home/codespace- https://github.com/devcontainers/images/tree/main/src/universal#description

Hope this answers all your questions.

[samruddhikhandale]

✨ Also, a suggestion to switch to use images with path mcr.microsoft.com/devcontainers/*

ℹ️ As we're starting to migrate contents of microsoft/vscode-dev-containers repo to the devcontainers org, as part of the work on the open dev container specification.

We'll are publishing images from devcontainers/images with path mcr.microsoft.com/devcontainers/*. Images with path mcr.microsoft.com/vscode/devcontainers/* will still be published from the new repo for backwards compatibility, but it will be nice if you could adapt to it now. 😄

For more details, you can review the announcement issue

[tomatebeans]

Awesome. Thanks very much for the explanations.