docker-entrypoint.sh

#!/usr/bin/env bash
set -euo pipefail

# eBPF requires the host kernel's BTF. vmlinux.h is generated from it and the
# uprobes attach against it, so it must be mounted into the container.
if [ ! -e /sys/kernel/btf/vmlinux ]; then
	echo "error: /sys/kernel/btf/vmlinux not found." >&2
	echo "Run with a BTF-enabled host kernel and the BTF mounted, e.g.:" >&2
	echo "  docker run --privileged -v /sys/kernel/btf:/sys/kernel/btf:ro ... sqlite-hook ..." >&2
	exit 1
fi

# Build the tracer (generates vmlinux.h from the mounted host BTF + the skeleton)
# if the mounted tree doesn't already carry a built binary.
if [ ! -x /app/build/sqlite_trace ]; then
	echo "==> building sqlite_trace (vmlinux.h from host BTF + skeleton)" >&2
	make -C /app trace >&2
fi

# Loader default for the BTF blobs; the mounted tree's build/btf symlinks into
# .btf-cache. Override with -e SQLITE_TRACE_BTF_DIR=... to point elsewhere.
export SQLITE_TRACE_BTF_DIR="${SQLITE_TRACE_BTF_DIR:-/app/build/btf}"

# `run-tests` runs the full suite (builds libs/demos first); anything else is
# passed straight through to the tracer.
if [ "${1:-}" = "run-tests" ]; then
	exec make -C /app test
fi

exec /app/build/sqlite_trace "$@"