Support for Debian "trixie" release in docker-outside-of-docker feature

[dalybrown]

Hello,

Is there a reason why the testing release of Debian (trixie or sid) is not supported in this list?

features/src/docker-outside-of-docker/install.sh

Line 23 in 648c8d5

DOCKER_LICENSED_ARCHIVE_VERSION_CODENAMES="bookworm buster bullseye bionic focal hirsute impish jammy noble"

I couldn't find any information on why the codename needs to be checked. For development, we like to use the sid repository for many packages, but that will update our /etc/os-release information to trixie (currently) and therefore won't be supported. Consequently, the feature can't be installed.

Can we add trixie to this list? Thanks!

[erwinkramer]

Also wondering this for the docker-in-docker feature, let me know if i need to make a separate issue for that. Want to run this inside image mcr.microsoft.com/devcontainers/dotnet:dev-10.0-preview-trixie

[skatsubo]

As Trixie went stable, it's time to update the abovementioned DOCKER_LICENSED_ARCHIVE_VERSION_CODENAMES, right?

@dalybrown

I couldn't find any information on why the codename needs to be checked.

I guess it's for installing from download.docker.com

features/src/docker-outside-of-docker/install.sh

Lines 221 to 236 in 849a5e2

	# Set up the necessary apt repos (either Microsoft's or Docker's)
	if [ "${USE_MOBY}" = "true" ]; then
	cli_package_name="moby-cli"
	# Import key safely and import Microsoft apt repo
	curl -sSL ${MICROSOFT_GPG_KEYS_URI} | gpg --dearmor > /usr/share/keyrings/microsoft-archive-keyring.gpg
	echo "deb [arch=${architecture} signed-by=/usr/share/keyrings/microsoft-archive-keyring.gpg] https://packages.microsoft.com/repos/microsoft-${ID}-${VERSION_CODENAME}-prod ${VERSION_CODENAME} main" > /etc/apt/sources.list.d/microsoft.list
	else
	# Name of proprietary engine package
	cli_package_name="docker-ce-cli"
	# Import key safely and import Docker apt repo
	curl -fsSL https://download.docker.com/linux/${ID}/gpg | gpg --dearmor > /usr/share/keyrings/docker-archive-keyring.gpg
	echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/${ID} ${VERSION_CODENAME} stable" > /etc/apt/sources.list.d/docker.list
	fi

Actually Trixie on download.docker.com became available since April moby/moby#49494

[erwinkramer]

@skatsubo, @AlvaroRausell it's kind of supported now, but not with moby enabled:

10.72 E: Unable to locate package moby-cli
10.72 E: Unable to locate package moby-buildx
10.72 E: Unable to locate package moby-engine
10.73 (!) Packages for moby not available in OS debian trixie (amd64).

[skatsubo]

but not with moby enabled

Right.
moby: true is not working currently for trixie

due to missing moby package in packages.microsoft.com/repos/microsoft-debian-trixie-prod

Discussed in #1442

[threema-donat]

@skatsubo Is it correct that this is still not working with trixie although the merge request #1442 is completed? I'm trying to build a dev container with trixie and it says:

E: Unable to locate package moby-buildx
(!) It seems packages for moby not available in OS debian trixie (amd64). To resolve, either: (1) set feature option '"moby": false' , or (2) choose a compatible OS version (eg: 'ubuntu-24.04').
[2025-09-01T05:38:56.758Z] ERROR: Feature "Docker (docker-outside-of-docker)" (ghcr.io/devcontainers/features/docker-outside-of-docker) failed to install! Look at the documentation at https://github.com/devcontainers/features/tree/main/src/docker-outside-of-docker for help troubleshooting this error.

[skatsubo]

@threema-donat

Is it correct that this is still not working with trixie although the merge request #1442 is completed?

Right. You can follow suggestions in the error message for a workaround.
More details in the linked PR and in comments above.