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#!/bin/bash |
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# |
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# Setup and configure qemu userspace emulator on kokoro worker so that we can seamlessly emulate processes running |
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# inside docker containers. |
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set -ex |
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# show pre-existing qemu registration |
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cat /proc/sys/fs/binfmt_misc/qemu-aarch64 |
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# Kokoro ubuntu1604 workers have already qemu-user and qemu-user-static packages installed, but it's and old version that: |
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# * prints warning about some syscalls (e.g "qemu: Unsupported syscall: 278") |
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# * doesn't register with binfmt_misc with the "F" flag we need (see below) |
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# To avoid the "unsupported syscall" warnings, we download a recent version of qemu-aarch64-static. |
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# On newer distributions (such as glinux), simply "apt install qemu-user-static" is sufficient. |
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curl -sSL --output qemu-aarch64-static https://github.com/multiarch/qemu-user-static/releases/download/v5.2.0-2/qemu-aarch64-static |
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chmod ugo+x qemu-aarch64-static |
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sudo mv qemu-aarch64-static /usr/local/bin |
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/usr/local/bin/qemu-aarch64-static --version |
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# register qemu-aarch64-static with binfmt_misc to use it as emulator for aarch64 binaries (based on their magic and mask) |
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# The format of the configuration string is ":name:type:offset:magic:mask:interpreter:flags" |
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# The most important flag is "F", which allows the qemu-aarch64-static binary to be loaded regardless of chroot and namespaces. |
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# That way, we can emulate aarch64 binaries running inside docker containers transparently, without needing the emulator |
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# to be accessible from the docker image we're emulating. |
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echo -1 | sudo tee /proc/sys/fs/binfmt_misc/qemu-aarch64 # delete the existing registration |
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echo ":qemu-aarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-aarch64-static:OCF" | sudo tee /proc/sys/fs/binfmt_misc/register |
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# Print current qemu reqistration to make sure everything is setup correctly. |
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cat /proc/sys/fs/binfmt_misc/qemu-aarch64 |
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