feat: run GNU testsuite

.github/workflows/run-gnu-test.yml

@@ -0,0 +1,68 @@
+
+name: Run GNU Test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  native:
+    name: Run GNU tests (native)
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout code (uutils/util-linux)
+        uses: actions/checkout@v6
+        with:
+          path: uutils-util-linux
+      - name: Checkout code (util-linux/util-linux)
+        uses: actions/checkout@v6
+        with:
+          repository: util-linux/util-linux
+          path: gnu-util-linux
+          ref: v2.41.4
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "./uutils-util-linux -> target"
+      - name: Install dependencies
+        run: |
+          sudo apt-get update --quiet
+          sudo apt-get install -y \
+            build-essential autoconf automake autopoint pkg-config \
+            libtool gettext bison \
+            bc socat ntp iproute2 squashfs-tools \
+            libcap-ng-dev libpam-dev libudev-dev python3-dev libmount-dev libclang-dev libsmartcols-dev curl
+      - name: Build GNU tests
+        run: |
+          cd gnu-util-linux
+          ./autogen.sh
+          ./configure
+          make -j$(nproc) check-programs
+      - name: Download test baseline if exists
+        id: download-test-baseline
+        continue-on-error: true
+        uses: actions/download-artifact@v8
+        with:
+          name: gnu-test-failures
+          path: uutils-util-linux/.reference/
+
+      - name: Run GNU tests
+        env:
+          GNU_PROJECT_DIR: ${{ github.workspace }}/gnu-util-linux
+        run: |
+          cd uutils-util-linux
+          ./scripts/run-tests.sh
+
+      - name: Update test baseline
+        if: github.ref == 'refs/heads/main'
+        run: |
+          cd uutils-util-linux
+          ./scripts/check-new-gnu-failures.sh --update-baseline
+
+      - name: Upload test baseline artifact
+        if: github.ref == 'refs/heads/main' || steps.download-test-baseline.outcome == 'failure'
+        uses: actions/upload-artifact@v7
+        with:
+          name: gnu-test-failures
+          path: uutils-util-linux/.reference/gnu-test-failures.txt

.gitignore

@@ -1,3 +1,6 @@
 syntax: glob
 
 /target/
+
+.test-helpers
+.reference

scripts/check-new-gnu-failures.sh

@@ -0,0 +1,96 @@
+#!/bin/bash
+set -euo pipefail
+
+cd "$(dirname "$0")/../"
+PROJECT_DIR="$(pwd)"
+DIFF_DIR="$PROJECT_DIR/.test-helpers/tests/diff"
+BASELINE="$PROJECT_DIR/.reference/gnu-test-failures.txt"
+UPDATE_BASELINE=false
+EMPTY_BASELINE=false
+
+for arg in "$@"; do
+    case "$arg" in
+        --update-baseline) UPDATE_BASELINE=true ;;
+        *) echo "Unknown argument: $arg" >&2; exit 2 ;;
+    esac
+done
+
+# Collect current failures (exclude .err companion files)
+current_tmp=$(mktemp)
+trap 'rm -f "$current_tmp"' EXIT
+if [[ -d "$DIFF_DIR" ]]; then
+    find "$DIFF_DIR" -mindepth 2 -maxdepth 2 -type f ! -name "*.err" -print0 \
+        | sort -z \
+        | while IFS= read -r -d '' path; do
+            echo "${path#"$DIFF_DIR/"}"
+          done > "$current_tmp"
+fi
+
+# --update-baseline mode
+if [[ "$UPDATE_BASELINE" == true ]]; then
+    {
+        echo "# Known GNU test failures - format: util/testname"
+        echo "# Update with: ./scripts/check-new-gnu-failures.sh --update-baseline"
+        cat "$current_tmp"
+    } > "$BASELINE"
+    count=$(wc -l < "$current_tmp")
+    echo "Baseline updated: $BASELINE ($count failures recorded)"
+    exit 0
+fi
+
+# Load baseline (strip comments and blank lines)
+baseline_tmp=$(mktemp)
+trap 'rm -f "$current_tmp" "$baseline_tmp"' EXIT
+if [[ -f "$BASELINE" ]]; then
+    grep -v '^\s*#' "$BASELINE" | grep -v '^\s*$' | sort > "$baseline_tmp"
+else
+    echo "WARNING: Baseline not found: $BASELINE" >&2
+    echo "  Run with --update-baseline to create it." >&2
+    touch "$baseline_tmp"
+    EMPTY_BASELINE=true
+fi
+
+# comm: -13 = lines only in current (new failures), -23 = lines only in baseline (fixed)
+new_failures=$(comm -13 "$baseline_tmp" "$current_tmp")
+fixed_tests=$(comm -23 "$baseline_tmp" "$current_tmp")
+
+# Report
+echo "--- GNU test failure summary ---"
+echo "Baseline failures: $(wc -l < "$baseline_tmp")"
+echo "Current failures:  $(wc -l < "$current_tmp")"
+echo ""
+
+if [[ "$EMPTY_BASELINE" == true ]]; then
+    mkdir -p "$(dirname "$BASELINE")"
+    {
+        echo "# Known GNU test failures - format: util/testname"
+        echo "# Update with: ./scripts/check-new-gnu-failures.sh --update-baseline"
+        cat "$current_tmp"
+    } > "$BASELINE"
+    count=$(wc -l < "$current_tmp")
+    echo "Initial baseline created: $BASELINE ($count failures recorded)"
+    exit 0
+fi
+
+if [[ -n "$fixed_tests" ]]; then
+    echo "Tests newly FIXED:"
+    awk '{print " [FIXED] " $0}' <<< "$fixed_tests"
+    echo ""
+fi
+
+if [[ -n "$new_failures" ]]; then
+    echo "Tests newly FAILING:"
+    awk '{print " [NEW FAILURE] " $0}' <<< "$new_failures"
+    echo ""
+    count=$(wc -l <<< "$new_failures")
+    echo "ERROR: $count new test failure(s) detected." >&2
+    echo "  Fix the regression, or if intentional, update the baseline:" >&2
+    echo "    ./scripts/check-new-gnu-failures.sh --update-baseline" >&2
+    exit 1
+fi
+
+echo "No new failures. All current failures are known."
+if [[ -n "$fixed_tests" ]]; then
+    echo "Consider updating the baseline to remove fixed tests:"
+    echo "  ./scripts/check-new-gnu-failures.sh --update-baseline"
+fi

scripts/gen-test-helper.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+set -euxo pipefail
+
+UTILS=(cal dmesg hexdump lscpu lslocks lsmem)
+
+cd "$(dirname "$0")/../"
+PROJECT_DIR="$(pwd)"
+BINARY="$PROJECT_DIR/target/release/util-linux"
+
+mkdir -p .test-helpers
+
+for util in "${UTILS[@]}"; do
+    cat > ".test-helpers/$util" <<EOF
+#!/bin/bash
+exec "$BINARY" $util "\$@"
+EOF
+    chmod +x ".test-helpers/$util"
+done
+

scripts/run-tests.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -euxo pipefail
+
+cd "$(dirname "$0")/../"
+PROJECT_DIR="$(pwd)"
+
+cargo build --release
+
+./scripts/gen-test-helper.sh
+
+# Clear stale diff files from any previous run
+rm -rf "$PROJECT_DIR/.test-helpers/tests/diff"
+
+# Run GNU tests; allow non-zero exit (known failures exist)
+set +e
+"$GNU_PROJECT_DIR/tests/run.sh" \
+    --builddir="$PROJECT_DIR/.test-helpers" \
+    "$@" \
+    cal dmesg hexdump lscpu lslocks lsmem
+GNU_TEST_EXIT=$?
+set -e
+
+[[ $GNU_TEST_EXIT -ne 0 ]] && echo "GNU test runner exited with code $GNU_TEST_EXIT"
+
+./scripts/check-new-gnu-failures.sh