numa.toml

@@ -2,9 +2,10 @@
 bind_addr = "0.0.0.0:53"
 api_port = 5380
 # api_bind_addr = "127.0.0.1"  # default; set to "0.0.0.0" for LAN dashboard access
-# data_dir = "/usr/local/var/numa"  # where numa stores TLS CA and cert material
+# data_dir = "/var/lib/numa"  # where numa stores TLS CA and cert material
-                                    # (default: /usr/local/var/numa on unix,
+                              # Defaults: /var/lib/numa on linux (FHS),
-                                    # %PROGRAMDATA%\numa on windows). Override for
+                              # /usr/local/var/numa on macos (homebrew prefix),
+                              # %PROGRAMDATA%\numa on windows. Override for
                               # containerized deploys or tests that can't
                               # write to the system path.
 

src/lib.rs

@@ -26,7 +26,10 @@ pub type Error = Box<dyn std::error::Error + Send + Sync>;
 pub type Result<T> = std::result::Result<T, Error>;
 
 /// Shared config directory for persistent data (services.json, etc).
-/// Unix: ~/.config/numa/ (or /usr/local/var/numa/ when running as root daemon)
+/// Unix users: ~/.config/numa/
+/// Linux root daemon: /var/lib/numa (FHS) — falls back to /usr/local/var/numa
+///                    if a pre-v0.10.1 install already lives there.
+/// macOS root daemon: /usr/local/var/numa (Homebrew prefix)
 /// Windows: %APPDATA%\numa
 pub fn config_dir() -> std::path::PathBuf {
     #[cfg(windows)]
@@ -63,13 +66,15 @@ fn config_dir_unix() -> std::path::PathBuf {
     }
 
     // Running as root daemon (launchd/systemd) — use system-wide path
-    std::path::PathBuf::from("/usr/local/var/numa")
+    daemon_data_dir()
 }
 
 /// Default system-wide data directory for TLS certs. Overridable via
 /// `[server] data_dir = "..."` in numa.toml — this function only provides
 /// the fallback when the config doesn't set it.
-/// Unix: /usr/local/var/numa
+/// Linux: /var/lib/numa (FHS) — falls back to /usr/local/var/numa if a
+///        pre-v0.10.1 install already has data there.
+/// macOS: /usr/local/var/numa (Homebrew prefix)
 /// Windows: %PROGRAMDATA%\numa
 pub fn data_dir() -> std::path::PathBuf {
     #[cfg(windows)]
@@ -81,6 +86,62 @@ pub fn data_dir() -> std::path::PathBuf {
     }
     #[cfg(not(windows))]
     {
+        daemon_data_dir()
+    }
+}
+
+/// Resolve the system-wide data directory for the running platform.
+/// Honors backwards compatibility with pre-v0.10.1 installs that still
+/// have their CA cert + services.json under `/usr/local/var/numa`.
+#[cfg(not(windows))]
+fn daemon_data_dir() -> std::path::PathBuf {
+    #[cfg(target_os = "linux")]
+    {
+        std::path::PathBuf::from(resolve_linux_data_dir(
+            std::path::Path::new("/usr/local/var/numa").exists(),
+            std::path::Path::new("/var/lib/numa").exists(),
+        ))
+    }
+    #[cfg(target_os = "macos")]
+    {
+        // macOS uses the Homebrew prefix convention; no FHS migration needed.
         std::path::PathBuf::from("/usr/local/var/numa")
     }
 }
+
+/// Extracted as a pure function so the migration logic is unit-testable
+/// without touching the real filesystem.
+#[cfg(any(target_os = "linux", test))]
+fn resolve_linux_data_dir(legacy_exists: bool, fhs_exists: bool) -> &'static str {
+    if legacy_exists && !fhs_exists {
+        "/usr/local/var/numa"
+    } else {
+        "/var/lib/numa"
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn linux_data_dir_fresh_install_uses_fhs() {
+        assert_eq!(resolve_linux_data_dir(false, false), "/var/lib/numa");
+    }
+
+    #[test]
+    fn linux_data_dir_upgrading_install_keeps_legacy() {
+        // Migration must keep legacy so the user doesn't lose their CA on upgrade.
+        assert_eq!(resolve_linux_data_dir(true, false), "/usr/local/var/numa");
+    }
+
+    #[test]
+    fn linux_data_dir_after_migration_uses_fhs() {
+        assert_eq!(resolve_linux_data_dir(true, true), "/var/lib/numa");
+    }
+
+    #[test]
+    fn linux_data_dir_only_fhs_uses_fhs() {
+        assert_eq!(resolve_linux_data_dir(false, true), "/var/lib/numa");
+    }
+}

tests/docker/smoke-arch.sh

@@ -0,0 +1,147 @@
+#!/usr/bin/env bash
+#
+# Arch Linux compatibility smoke test.
+#
+# Builds numa from source inside an archlinux:latest container, runs it
+# in forward mode on port 5354, and verifies a single DNS query returns
+# an A record. Validates the "Arch compatible" claim end-to-end before
+# release announcements.
+#
+# Dogfooding: the test numa forwards to the host's running numa via
+# host.docker.internal (Docker Desktop's host gateway). This avoids the
+# Docker NAT/UDP issues with public resolvers and exercises the realistic
+# numa-on-numa shape. Requires the host to be running numa on port 53.
+#
+# First run is slow (~8-12 min): image pull + pacman + cold cargo build.
+# No caching across runs.
+#
+# Requirements: docker, host running numa on 0.0.0.0:53
+# Usage:        ./tests/docker/smoke-arch.sh
+
+set -euo pipefail
+
+cd "$(dirname "$0")/../.."
+
+GREEN="\033[32m"; RED="\033[31m"; RESET="\033[0m"
+
+# Precondition: the test numa-on-arch forwards to the host numa as its
+# upstream (dogfood pattern). Fail fast with a clear error if there is
+# no working DNS on the host, rather than letting the dig inside the
+# container time out with "deadline has elapsed".
+if ! dig @127.0.0.1 google.com A +short +time=1 +tries=1 >/dev/null 2>&1; then
+    printf "${RED}error:${RESET} host numa is not answering on 127.0.0.1:53\n" >&2
+    echo "  This test forwards to the host numa via host.docker.internal." >&2
+    echo "  Start numa on the host first (sudo numa install), then rerun." >&2
+    exit 1
+fi
+
+echo "── building + running numa on archlinux:latest ──"
+echo "  (first run is slow: image pull + pacman + cold cargo build, ~8-12 min)"
+echo
+
+docker run --rm \
+    --platform linux/amd64 \
+    --security-opt seccomp=unconfined \
+    -v "$PWD:/src:ro" \
+    -v numa-arch-cargo:/root/.cargo \
+    -v numa-arch-target:/work/target \
+    archlinux:latest bash -c '
+    set -e
+
+    # pacman 7+ filters syscalls in its own sandbox; disable for Rosetta/qemu
+    sed -i "s/^#DisableSandboxSyscalls/DisableSandboxSyscalls/" /etc/pacman.conf
+
+    echo "── pacman: installing build + runtime deps ──"
+    pacman -Sy --noconfirm --needed rust gcc pkgconf cmake make perl bind 2>&1 | tail -3
+    echo
+
+    # Copy source to a writable workdir, skipping target/ + .git so we
+    # do not pull in the host (macOS) build artifacts.
+    mkdir -p /work
+    tar -C /src --exclude=./target --exclude=./.git -cf - . | tar -C /work -xf -
+    cd /work
+
+    echo "── cargo build --release --locked ──"
+    cargo build --release --locked 2>&1 | tail -5
+    echo
+
+    # Dogfood: forward to the host numa via host.docker.internal.
+    # numa parses upstream.address as a literal SocketAddr, so we resolve
+    # the hostname to an IPv4 address first (force v4 — getent hosts may
+    # return IPv6 first, and IPv6 addresses need bracketed addr:port form).
+    HOST_IP=$(getent ahostsv4 host.docker.internal | awk "/STREAM/ {print \$1; exit}")
+    if [ -z "$HOST_IP" ]; then
+        echo "  ✗ could not resolve host.docker.internal to IPv4 (not on Docker Desktop?)"
+        exit 1
+    fi
+    echo "── starting numa on :5354 (forward to host numa at $HOST_IP:53) ──"
+    # Intentionally NOT setting [server] data_dir — we want to exercise the
+    # default code path (data_dir() → daemon_data_dir() → /var/lib/numa) so
+    # the FHS-path assertion below verifies the live wiring, not just the
+    # unit-tested helper.
+    cat > /tmp/numa.toml <<EOF
+[server]
+bind_addr = "127.0.0.1:5354"
+api_port = 5381
+
+[upstream]
+mode = "forward"
+address = "$HOST_IP"
+port = 53
+EOF
+
+    ./target/release/numa /tmp/numa.toml > /tmp/numa.log 2>&1 &
+    NUMA_PID=$!
+
+    # Poll for readiness — numa is ready when it answers a query
+    READY=0
+    for i in 1 2 3 4 5 6 7 8; do
+        sleep 1
+        if dig @127.0.0.1 -p 5354 google.com A +short +time=1 +tries=1 2>/dev/null \
+            | grep -qE "^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$"; then
+            READY=1
+            break
+        fi
+    done
+
+    if [ "$READY" -ne 1 ]; then
+        echo "  ✗ numa did not return an A record after 8s"
+        echo "  numa log:"
+        cat /tmp/numa.log
+        kill $NUMA_PID 2>/dev/null || true
+        exit 1
+    fi
+
+    echo "── dig @127.0.0.1 -p 5354 google.com A ──"
+    ANSWER=$(dig @127.0.0.1 -p 5354 google.com A +short +time=2 +tries=1)
+    echo "$ANSWER" | sed "s/^/  /"
+
+    kill $NUMA_PID 2>/dev/null || true
+
+    # FHS path assertion: the default data dir on Linux must be /var/lib/numa
+    # (not the legacy /usr/local/var/numa). The CA cert generated at startup
+    # is the canonical proof that numa wrote to the right place.
+    echo
+    echo "── FHS path check ──"
+    if [ -f /var/lib/numa/ca.pem ]; then
+        echo "  ✓ CA cert at /var/lib/numa/ca.pem (FHS path)"
+    else
+        echo "  ✗ CA cert NOT at /var/lib/numa/ca.pem"
+        echo "  ls /var/lib/numa/:"
+        ls -la /var/lib/numa/ 2>&1 | sed "s/^/    /"
+        echo "  ls /usr/local/var/numa/:"
+        ls -la /usr/local/var/numa/ 2>&1 | sed "s/^/    /"
+        exit 1
+    fi
+    if [ -e /usr/local/var/numa ]; then
+        echo "  ✗ legacy path /usr/local/var/numa unexpectedly exists on a fresh container"
+        exit 1
+    fi
+    echo "  ✓ legacy path /usr/local/var/numa absent (fresh install used FHS)"
+
+    echo
+    echo "  ✓ numa built, ran, answered a forward query, and used the FHS data dir on Arch"
+'
+
+echo
+printf "${GREEN}── smoke-arch passed ──${RESET}\n"