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Diffstat (limited to 'grpc/tools/internal_ci/helper_scripts/prepare_qemu_rc')
| -rw-r--r-- | grpc/tools/internal_ci/helper_scripts/prepare_qemu_rc | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/grpc/tools/internal_ci/helper_scripts/prepare_qemu_rc b/grpc/tools/internal_ci/helper_scripts/prepare_qemu_rc new file mode 100644 index 00000000..55bffcc2 --- /dev/null +++ b/grpc/tools/internal_ci/helper_scripts/prepare_qemu_rc @@ -0,0 +1,37 @@ +#!/bin/bash +# Copyright 2021 The gRPC Authors +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +# Source this rc script to setup and configure qemu userspace emulator on kokoro worker so that we can seamlessly emulate processes running +# inside docker containers. + +# show pre-existing qemu registration +cat /proc/sys/fs/binfmt_misc/qemu-aarch64 + +# Kokoro ubuntu1604 workers have already qemu-user and qemu-user-static packages installed, but it's and old version that: +# * prints warning about some syscalls (e.g "qemu: Unsupported syscall: 278") +# * doesn't register with binfmt_misc with the persistent ("F") flag we need (see below) +# +# To overcome the above limitations, we use the https://github.com/multiarch/qemu-user-static +# docker image to provide a new enough version of qemu-user-static and register it with +# the desired binfmt_misc flags. The most important flag we need is "F" (set by "--persistent yes"), +# which allows the qemu-aarch64-static binary to be loaded eagerly at the time of registration with binfmt_misc. +# That way, we can emulate aarch64 binaries running inside docker containers transparently, without needing the emulator +# binary to be accessible from the docker image we're emulating. +# Note that on newer distributions (such as glinux), simply "apt install qemu-user-static" is sufficient +# to install qemu-user-static with the right flags. +docker run --rm --privileged multiarch/qemu-user-static:5.2.0-2 --reset --credential yes --persistent yes + +# Print current qemu reqistration to make sure everything is setup correctly. +cat /proc/sys/fs/binfmt_misc/qemu-aarch64 |