Add resilient HPL source fallbacks

iso/builder/build-hpl.sh

@@ -38,22 +38,109 @@ mkdir -p "${DOWNLOAD_CACHE_DIR}" "${CACHE_DIR}/bin" "${CACHE_DIR}/lib"
 
 # ── download HPL source ────────────────────────────────────────────────────────
 HPL_TAR="${DOWNLOAD_CACHE_DIR}/hpl-${HPL_VERSION}.tar.gz"
-HPL_URL="https://www.netlib.org/benchmark/hpl/hpl-${HPL_VERSION}.tar.gz"
+DEFAULT_HPL_URLS="
+https://www.netlib.org/benchmark/hpl/hpl-${HPL_VERSION}.tar.gz
+https://fossies.org/linux/privat/hpl-${HPL_VERSION}.tar.gz
+"
+HPL_GIT_URL="${HPL_GIT_URL:-https://github.com/icl-utk-edu/hpl.git}"
+DEFAULT_HPL_GIT_REFS="v${HPL_VERSION} ${HPL_VERSION} main"
+HPL_SOURCE_MODE="tarball"
+
+download_to_file() {
+    url="$1"
+    out="$2"
+
+    if command -v curl >/dev/null 2>&1; then
+        curl -fL \
+            --connect-timeout 15 \
+            --max-time 180 \
+            --retry 2 \
+            --retry-delay 2 \
+            --output "${out}" \
+            "${url}"
+        return $?
+    fi
+
+    wget \
+        --show-progress \
+        --tries=2 \
+        --timeout=30 \
+        -O "${out}" \
+        "${url}"
+}
+
+download_hpl_tarball() {
+    out="$1"
+    tmp="${out}.part"
+    urls="${HPL_URLS:-$DEFAULT_HPL_URLS}"
+
+    rm -f "${tmp}"
+    for url in ${urls}; do
+        [ -n "${url}" ] || continue
+        echo "=== trying HPL source: ${url} ==="
+        if download_to_file "${url}" "${tmp}"; then
+            mv "${tmp}" "${out}"
+            return 0
+        fi
+        rm -f "${tmp}"
+        echo "=== failed: ${url} ==="
+    done
+
+    echo "ERROR: failed to download HPL ${HPL_VERSION} from all configured URLs" >&2
+    return 1
+}
+
+download_hpl_from_git_archive() {
+    out="$1"
+    refs="${HPL_GIT_REFS:-$DEFAULT_HPL_GIT_REFS}"
+    tmp_root="$(mktemp -d)"
+    repo_dir="${tmp_root}/repo"
+    archive_dir="${tmp_root}/hpl-${HPL_VERSION}"
+    archive_tmp="${out}.part"
+
+    for ref in ${refs}; do
+        [ -n "${ref}" ] || continue
+        echo "=== trying HPL git source: ${HPL_GIT_URL} ref ${ref} ==="
+        rm -rf "${repo_dir}" "${archive_dir}" "${archive_tmp}"
+        if git clone --depth 1 --branch "${ref}" "${HPL_GIT_URL}" "${repo_dir}"; then
+            mv "${repo_dir}" "${archive_dir}"
+            tar czf "${archive_tmp}" -C "${tmp_root}" "hpl-${HPL_VERSION}"
+            mv "${archive_tmp}" "${out}"
+            rm -rf "${tmp_root}"
+            HPL_SOURCE_MODE="git"
+            return 0
+        fi
+        echo "=== failed git ref: ${ref} ==="
+    done
+
+    rm -rf "${tmp_root}" "${archive_tmp}"
+    echo "ERROR: failed to obtain HPL ${HPL_VERSION} from all configured sources" >&2
+    echo "  looked for cache: ${out}" >&2
+    echo "  tarball mirrors: ${HPL_URLS:-$DEFAULT_HPL_URLS}" >&2
+    echo "  git fallback: ${HPL_GIT_URL} refs ${refs}" >&2
+    echo "  override mirrors with HPL_URLS=\"https://mirror1/...\"" >&2
+    echo "  override git refs with HPL_GIT_REFS=\"v${HPL_VERSION} ${HPL_VERSION} main\"" >&2
+    return 1
+}
 
 if [ ! -f "${HPL_TAR}" ]; then
     echo "=== downloading HPL ${HPL_VERSION} ==="
-    wget --show-progress -O "${HPL_TAR}" "${HPL_URL}"
+    download_hpl_tarball "${HPL_TAR}" || download_hpl_from_git_archive "${HPL_TAR}"
 fi
 
-actual_sha="$(sha256sum "${HPL_TAR}" | awk '{print $1}')"
-if [ "${actual_sha}" != "${HPL_SHA256}" ]; then
-    echo "ERROR: sha256 mismatch for hpl-${HPL_VERSION}.tar.gz" >&2
-    echo "  expected: ${HPL_SHA256}" >&2
-    echo "  actual:   ${actual_sha}" >&2
-    rm -f "${HPL_TAR}"
-    exit 1
+if [ "${HPL_SOURCE_MODE}" = "tarball" ]; then
+    actual_sha="$(sha256sum "${HPL_TAR}" | awk '{print $1}')"
+    if [ "${actual_sha}" != "${HPL_SHA256}" ]; then
+        echo "ERROR: sha256 mismatch for hpl-${HPL_VERSION}.tar.gz" >&2
+        echo "  expected: ${HPL_SHA256}" >&2
+        echo "  actual:   ${actual_sha}" >&2
+        rm -f "${HPL_TAR}"
+        exit 1
+    fi
+    echo "sha256 OK: hpl-${HPL_VERSION}.tar.gz"
+else
+    echo "=== HPL source obtained from git fallback; skipping tarball sha256 check ==="
 fi
-echo "sha256 OK: hpl-${HPL_VERSION}.tar.gz"
 
 # ── download OpenBLAS from Debian 12 apt repo ─────────────────────────────────
 REPO_BASE="https://deb.debian.org/debian/pool/main/o/openblas"