;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2022 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu installer hardware)
  #:use-module (gnu build linux-modules)
  #:use-module (guix i18n)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-71)
  #:export (unsupported-pci-device?
            pci-device-description))

(define %unsupported-linux-modules
  ;; List of Linux modules that are useless without non-free firmware.
  ;;
  ;; Currently only drivers for PCI devices are listed.  USB devices such as
  ;; "btintel" would require support to list USB devices and read the USB
  ;; device ID database.  Punt for now as this is usually less critical.
  ;;
  ;; This list is currently manually maintained based on information on
  ;; non-free firmware available from
  ;; <https://packages.debian.org/search?keywords=firmware&searchon=names&suite=stable&section=all>.
  '(;; WiFi.
    "brcmfmac"
    "ipw2100"
    "ipw2200"
    "iwlwifi"
    "mwl8k"
    "rtl8188ee"
    "rtl818x_pci"
    "rtl8192ce"
    "rtl8192de"
    "rtl8192ee"

    ;; Ethernet.
    "bnx2"
    "bnx2x"
    "liquidio"

    ;; Graphics.
    "amdgpu"
    "radeon"

    ;; Multimedia.
    "ivtv"))

(define unsupported-pci-device?
  ;; Arrange to load the module alias database only once.
  (let ((aliases (delay (known-module-aliases))))
    (lambda (device)
      "Return true if DEVICE is known to not be supported by free software."
      (any (lambda (module)
             (member module %unsupported-linux-modules))
           (matching-modules (pci-device-module-alias device)
                             (force aliases))))))

(define (pci-device-description pci-database)
  "Return a procedure that, given a PCI device, returns a string describing
it."
  (define (with-fallback lookup)
    (lambda (vendor-id id)
      (let ((vendor name (lookup vendor-id id)))
        (values (or vendor (number->string vendor-id 16))
                (or name (number->string id 16))))))

  (define pci-lookup
    (with-fallback (load-pci-device-database pci-database)))

  (lambda (device)
    (let ((vendor name (pci-lookup (pci-device-vendor device)
                                   (pci-device-id device))))
      (if (network-pci-device? device)
          ;; TRANSLATORS: The two placeholders are the manufacturer
          ;; and name of a PCI device.
          (format #f (G_ "~a ~a (networking device)")
                  vendor name)
          (string-append vendor " " name)))))
turns NULL.
             * If the second arg to realpath is passed in, the canonical path
-              is returned there.  Use a buffer of sufficient size.  If the
-              second arg is NULL, the path is malloc&apos;d and returned if the
-              file or directory exists.
-           We pass in a buffer for the second arg, and check that the canonical
-           directory path was made.  The existence of the directory is checked
-           later, after its actual path is returned by genPathname().  */
+              is returned there.  Use a buffer of sufficient size.
+              We pass in a buffer for the second arg, and check that the
+              canonical directory path was made.  The existence of the
+              directory is checked later, after its actual path is returned by
+              genPathname().
+              With GNU libc or Posix 2001, if the second arg is NULL, the path
+              is malloc&apos;d and returned if the file or directory exists.
+           */
+#if _POSIX_VERSION &gt;= 200112 || defined(__GLIBC__)
+    dir = realpath(dirname, NULL);
+    if (dir == NULL)
+        return (SARRAY *)ERROR_PTR(&quot;dir not made&quot;, __func__, NULL);
+#else
     dir[0] = &apos;\0&apos;;  /* init empty in case realpath() fails to write it */
     ignore = realpath(dirname, dir);
     if (dir[0] == &apos;\0&apos;)
         return (SARRAY *)ERROR_PTR(&quot;dir not made&quot;, procName, NULL);
+#endif
     realdir = genPathname(dir, NULL);
+#if _POSIX_VERSION &gt;= 200112 || defined(__GLIBC__)
+    LEPT_FREE(dir);
+#endif
     if ((pdir = opendir(realdir)) == NULL) {
         LEPT_FREE(realdir);
         return (SARRAY *)ERROR_PTR(&quot;pdir not opened&quot;, procName, NULL);
@@ -1998,10 +2013,12 @@
         stat_ret = fstatat(dfd, pdirentry-&gt;d_name, &amp;st, 0);
 #else
         size = strlen(realdir) + strlen(pdirentry-&gt;d_name) + 2;
+#if _POSIX_VERSION &lt; 200112 &amp;&amp; !defined(__GLIBC__)
         if (size &gt; PATH_MAX) {
             L_ERROR(&quot;size = %zu too large; skipping\n&quot;, procName, size);
             continue;
         }
+#endif
         stat_path = (char *)LEPT_CALLOC(size, 1);
         snprintf(stat_path, size, &quot;%s/%s&quot;, realdir, pdirentry-&gt;d_name);
         stat_ret = stat(stat_path, &amp;st);
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