libfprint-2-tod1-broadcom: init at 5.12.018

2024-08-01 14:27:54 +02:00
parent 994cf812fc
commit 25e042c3d4
2 changed files with 108 additions and 0 deletions
@@ -0,0 +1,85 @@
+{
+  autoPatchelfHook,
+  fetchzip,
+  lib,
+  libfprint-tod,
+  openssl,
+  patchelfUnstable, # have to use patchelfUnstable to support --rename-dynamic-symbols
+  stdenv,
+}:
+
+# Based on ideas from (using a wrapper library to redirect fopen() calls to firmware files):
+#   * https://tapesoftware.net/replace-symbol/
+#   * https://github.com/NixOS/nixpkgs/pull/260715
+let
+  pname = "libfprint-2-tod1-broadcom";
+  version = "5.12.018";
+
+  src = fetchzip {
+    url = "http://dell.archive.canonical.com/updates/pool/public/libf/${pname}/${pname}_${version}.orig.tar.gz";
+    hash = "sha256-0C2PpYpEJNrU+8NT95w4QV0J5nHQisMY94Czw3jQOzw=";
+    pname = "${pname}-unpacked";
+    inherit version;
+  };
+
+  # wraps `fopen()` for finding firmware files
+  wrapperLibName = "wrapper-lib.so";
+  wrapperLib = stdenv.mkDerivation {
+    pname = "${pname}-wrapper-lib";
+    inherit version;
+
+    src = ./.;
+
+    postPatch = ''
+      substitute wrapper-lib.c lib.c \
+        --subst-var-by to "${src}/var/lib/fprint/fw"
+      cc -fPIC -shared lib.c -o ${wrapperLibName}
+    '';
+
+    installPhase = ''
+      runHook preInstall
+      install -D -t $out/lib ${wrapperLibName}
+      runHook postInstall
+    '';
+  };
+in
+stdenv.mkDerivation {
+  inherit src pname version;
+
+  buildInputs = [
+    libfprint-tod
+    openssl
+    wrapperLib
+  ];
+
+  nativeBuildInputs = [
+    autoPatchelfHook
+    patchelfUnstable
+  ];
+
+  installPhase = ''
+    runHook preInstall
+    install -D -t "$out/lib/libfprint-2/tod-1/" -m 644 -v usr/lib/x86_64-linux-gnu/libfprint-2/tod-1/libfprint-2-tod-1-broadcom.so
+    install -D -t "$out/lib/udev/rules.d/"      -m 644 -v lib/udev/rules.d/60-libfprint-2-device-broadcom.rules
+    runHook postInstall
+  '';
+
+  postFixup = ''
+    echo fopen64 fopen_wrapper > fopen_name_map
+    patchelf \
+      --rename-dynamic-symbols fopen_name_map \
+      --add-needed ${wrapperLibName} \
+      "$out/lib/libfprint-2/tod-1/libfprint-2-tod-1-broadcom.so"
+  '';
+
+  passthru.driverPath = "/lib/libfprint-2/tod-1";
+
+  meta = with lib; {
+    description = "Broadcom driver module for libfprint-2-tod Touch OEM Driver (from Dell)";
+    homepage = "http://dell.archive.canonical.com/updates/pool/public/libf/libfprint-2-tod1-broadcom/";
+    license = licenses.unfree;
+    maintainers = with maintainers; [ pitkling ];
+    platforms = [ "x86_64-linux" ];
+    sourceProvenance = with sourceTypes; [ binaryNativeCode ];
+  };
+}
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static const char from[] =  "/var/lib/fprint/fw";
+static const char to[]   = "@to@";
+
+FILE* fopen_wrapper(const char* fn, const char* mode) {
+    size_t fn_len = strlen(fn);
+    size_t from_len = strlen(from);
+    if (fn_len > from_len && memcmp(fn, from, from_len) == 0) {
+        size_t to_len = strlen(to);
+        char* rewritten = calloc(fn_len + (to_len - from_len) + 1, 1);
+        memcpy(rewritten, to, to_len);
+        memcpy(rewritten + to_len, fn + from_len, fn_len - from_len);
+
+        printf("fopen_wrapper.c: Replacing path '%s' with '%s'\n", fn, rewritten);
+        FILE* result = fopen(rewritten, mode);
+        free(rewritten);
+        return result;
+    }
+    return fopen(fn, mode);
+}