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#!/usr/bin/env bash
# Build the ior binary inside a Rocky Linux 9 container and write it to the
# current directory. The container image is built once and reused on subsequent
# runs. The ior source tree is mounted as a volume so the resulting binary
# lands directly in $(pwd)/ior.
#
# Usage:
# ./build-with-docker.sh # build image + compile ior
# ./build-with-docker.sh --build # force rebuild of the Docker image
# ./build-with-docker.sh --run # skip image build, only compile ior
set -euo pipefail
IMAGE="ior-builder:rocky9"
REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
# Derive the Go version from go.mod so the Docker image always matches the
# minimum toolchain declared by the project.
GO_VERSION="$(grep '^go ' "${REPO_ROOT}/go.mod" | awk '{print $2}')"
BUILD_IMAGE=true
RUN_BUILD=true
for arg in "$@"; do
case "$arg" in
--build) BUILD_IMAGE=true; RUN_BUILD=false ;;
--run) BUILD_IMAGE=false; RUN_BUILD=true ;;
esac
done
if $BUILD_IMAGE; then
echo "==> Building Docker image ${IMAGE} (this takes ~15-20 min on first run)..."
docker build --platform=linux/amd64 --build-arg "GO_VERSION=${GO_VERSION}" -t "${IMAGE}" "${REPO_ROOT}"
echo "==> Image build complete."
fi
if $RUN_BUILD; then
echo "==> Compiling ior inside the container..."
# --privileged gives full host capabilities.
# tracefs (/sys/kernel/tracing) and BTF (/sys/kernel/btf) are not auto-mounted
# by Docker even with --privileged, so they are mounted explicitly:
# - /sys/kernel/tracing : mage generate reads available syscall tracepoints
# - /sys/kernel/btf : mage bpfBuild reads vmlinux BTF for vmlinux.h
docker run --rm \
--platform=linux/amd64 \
--privileged \
-v /sys/kernel/tracing:/sys/kernel/tracing \
-v /sys/kernel/btf:/sys/kernel/btf \
-v "${REPO_ROOT}:/git/ior" \
"${IMAGE}"
echo "==> Done. Binary written to ${REPO_ROOT}/ior"
fi
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