CODEWITHSUNDEEP
dockerrustcross-compiling
Mr.Smithyyy
Mr.Smithyyy

Reputation: 1329

rustembedded/cross- can't override linux image

I'm attempting to use rustembedded/cross to cross compile to linux but I need to override the default image since I need clang and the default image doesn't provide that.

According to their documentation, you can provide a dockerfile and a configuration file to accomplish this.

This led me to having a docker file of:

FROM rustembedded/cross:x86_64-unknown-linux-gnu

RUN dpkg --add-architecture x86_64 && apt-get update && \
    apt-get install --assume-yes --no-install-recommends \
    libclang-dev \
    clang

and a Cross.toml configuration file of:

[target.x86_64-unknown-linux-gnu]
image = "linux:v2"

Then, when I build this image with docker build -f ./Dockerfile.x86_64-unknown-linux-gnu -t linux:v2 ., it gives me an error saying that dkpg can't be found. Even if I remove that part it tells me that apt-get can't be found.

I can access the shell of the container that it extends, rustembedded/cross:x86_64-unknown-linux-gnu, in docker desktop and if I run dpkg, it shows me the help command. This is confusing since my image extends from it but it doesn't know about dkpg.

Upvotes: 1

Views: 183

Answers (1)

atline
atline

Reputation: 31584

rustembedded/cross:x86_64-unknown-linux-gnu is based on centos, not ubuntu, see its Dockerfile:

FROM ubuntu:16.04

COPY linux-image.sh /
RUN /linux-image.sh x86_64

FROM centos:7

It use multistage build, the last os is centos:7.

You could also confirm it with next:

$ docker run --rm -it rustembedded/cross:x86_64-unknown-linux-gnu cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

I don't know how you get dpkg with manual run, definitely something wrong with your steps. But the package system in centos is yum, you should find same ways using yum for your package install.

$ docker run --rm -it rustembedded/cross:x86_64-unknown-linux-gnu yum version
Loaded plugins: fastestmirror, ovl
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Installed: 7/x86_64                                                                                              213:96cbf4a3c83d0362309d530d515684dce3f40f63
Group-Installed: yum                                                                                              14:302aa408884b4b89361d6bb1c41ceac40665f80e
version

Upvotes: 1

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