Comments (4)
aparcar
commented on July 26, 2024
Looks like you're already working on a PR to fix that, thanks!
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bwoodsend
commented on July 26, 2024
Hmm, almost. But MIPS is causing issues.
I added a dumb run it test which sure enough reproduces this ticket. Adding my hypothesised one line fix fixes every platform except MIPS which is raising Docker's not so informative wrong architecture error.
Running it locally gives me the same thing:
> docker build --platform linux/mips_24kc --build-arg 'DOWNLOAD_FILE=openwrt-.*-rootfs.tar.gz' --build-arg WORKDIR=/ --build-arg USER=root --build-arg VERSION_PATH=snapshots --build-arg TARGET=malta/be --build-arg BASE_IMAGE=scratch --build-arg CMD=ash .
[+] Building 2.6s (22/22) FINISHED
=> [internal] load .dockerignore 0.0s
...
=> => writing image sha256:b3d596932ac4091b06535b990144d701814f26af08d573bb4484430b362005d3 0.0s
> docker run --platform=linux/mips_24kc sha256:b3d596932ac4091b06535b990144d701814f26af08d573bb4484430b362005d3 uname -m
exec /bin/uname: exec format errorI wasn't too sure what Docker/qemu aliases as mips_24kc (for the --platform flag) so I downloaded the rootfs tarball and tried to empirically determine which qemu emulator it needs:
wget https://downloads.openwrt.org/snapshots/targets/malta/be/openwrt-malta-be-default-rootfs.tar.gz
tar xf openwrt-malta-be-default-rootfs.tar.gz
for qemu in /bin/qemu-*static; echo $qemu; $qemu lib/libc.so; endqemu-mips-static is the emulator that matches the architecture of the binaries in that tarball which corresponds to --platform=linux/mips:
> docker run --rm --privileged multiarch/qemu-user-static --reset -p yes --credential yes | grep mips
Setting /usr/bin/qemu-mips-static as binfmt interpreter for mips
Setting /usr/bin/qemu-mipsel-static as binfmt interpreter for mipsel
Setting /usr/bin/qemu-mipsn32-static as binfmt interpreter for mipsn32
Setting /usr/bin/qemu-mipsn32el-static as binfmt interpreter for mipsn32el
Setting /usr/bin/qemu-mips64-static as binfmt interpreter for mips64
Setting /usr/bin/qemu-mips64el-static as binfmt interpreter for mips64elSetting --platform=linux/mips also doesn't work though:
> docker build --platform linux/mips -q --build-arg 'DOWNLOAD_FILE=openwrt-.*-rootfs.tar.gz' --build-arg WORKDIR=/ --build-arg USER=root --build-arg VERSION_PATH=snapshots --build-arg TARGET=malta/be --build-arg BASE_IMAGE=scratch --build-arg CMD=ash .
sha256:f8e5382d05afe40ea1618ba2dad3f1b2b1b3dd62a5dc744851b304682d465fbc
> docker run --platform=linux/mips sha256:f8e5382d05afe40ea1618ba2dad3f1b2b1b3dd62a5dc744851b304682d465fbc uname -m
exec /bin/uname: exec format errorI suspect that this reveals the cause:
> docker run --platform=linux/mips sha256:f8e5382d05afe40ea1618ba2dad3f1b2b1b3dd62a5dc744851b304682d465fbc /lib/libc.so
qemu-mipsn32-static: /lib/libc.so: Invalid ELF image for this architectureDocker is using qemu-mipsn32-static instead of qemu-mips-static.
So unless you have any ideas, I think the best I can do is fix the others and disable MIPs rootfs then poke around the Docker community to see why Docker is using the wrong qemu emulator.
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aparcar
commented on July 26, 2024
@dangowrt do you have an idea on how to treat this?
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aparcar
commented on July 26, 2024
Thank you for the insights, very helpful! I'd be fine to drop it for now
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