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#!/bin/bash
set -euo pipefail
readonly docker="${CONTAINER_ENGINE:-docker}"
extract_oci_image() {
local image_name=$1
local target_directory=$2
echo -n "Fetching $image_name... "
# We abuse the --output flag of docker buildx to obtain a copy of the image.
# This is simpler than creating a temporary container and using docker cp.
# It also automatically fetches the image for us if necessary.
if ! echo "FROM $image_name" | "$docker" buildx build --quiet --pull --output="$target_directory" - &> /dev/null; then
echo "failed"
return 1
fi
echo "ok"
return 0
}
tmp=$(mktemp -d)
cleanup() {
rm -r "$tmp"
}
trap cleanup EXIT
# Download and process libbpf.c
curl -fL "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/plain/tools/lib/bpf/libbpf.c?h=v$KERNEL_VERSION" -o "$tmp/libbpf.c"
"./internal/cmd/gensections.awk" "$tmp/libbpf.c" | gofmt > "./elf_sections.go"
# Download and process vmlinux and btf_testmod
extract_oci_image "ghcr.io/cilium/ci-kernels:$KERNEL_VERSION" "$tmp"
"/lib/modules/$(uname -r)/build/scripts/extract-vmlinux" "$tmp/boot/vmlinuz" > "$tmp/vmlinux"
objcopy --dump-section .BTF=/dev/stdout "$tmp/vmlinux" /dev/null | gzip > "btf/testdata/vmlinux.btf.gz"
find "$tmp/lib/modules" -type f -name bpf_testmod.ko -exec objcopy --dump-section .BTF="btf/testdata/btf_testmod.btf" {} /dev/null \;
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