data/fonts: make derivations fixed-outputs (group of fontforge compiled fonts)

pkgs/data/fonts/inconsolata/lgc.nix

@@ -24,6 +24,10 @@ stdenv.mkDerivation rec {
     cp -v AUTHORS ChangeLog COPYING License.txt README "$out/doc/${name}" || true
   '';
 
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = "18brmw0h4hjq1m2l0abwc3zmib4rnfalpywdk68djm711zldxr76";
+
   meta = with stdenv.lib; {
     description = "Fork of Inconsolata font, with proper support of Cyrillic and Greek";
     longDescription = ''

pkgs/data/fonts/libertine/default.nix

@@ -8,11 +8,14 @@ stdenv.mkDerivation rec {
     sha256 = "0x7cz6hvhpil1rh03rax9zsfzm54bh7r4bbrq8rz673gl9h47v0v";
   };
 
-  setSourceRoot = "sourceRoot=`pwd`";
+  sourceRoot = ".";
 
   nativeBuildInputs = [ fontforge ];
 
   buildPhase = ''
+    # <nixpkgs/pkgs/build-support/setup-hooks/set-source-date-epoch-to-latest.sh> set it to mtime of ./env-vars, i.e. the current time
+    export SOURCE_DATE_EPOCH=$(stat -c '%Y' ChangeLog.txt)
+
     for i in *.sfd; do
       fontforge -lang=ff -c \
         'Open($1);
@@ -40,6 +43,10 @@ stdenv.mkDerivation rec {
     cp *.map $out/share/texmf/fonts/map
   '';
 
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = "1mj0j0hkp8pn7jcs4pvcan6whba60bfd671g3vhx3s9kxwf7xjvr";
+
   meta = {
     description = "Linux Libertine Fonts";
     homepage = http://linuxlibertine.sf.net;

pkgs/data/fonts/monoid/default.nix

@@ -31,6 +31,10 @@ stdenv.mkDerivation rec {
     cp -va Readme.md $out/share/doc
   '';
 
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = "0ml61zym03n175gpx1gr7812f45lyjm0vzgbqjx91fi58rqlazvm";
+
   meta = with stdenv.lib; {
     homepage = http://larsenwork.com/monoid;
     description = "Customisable coding font with alternates, ligatures and contextual positioning";

pkgs/data/fonts/rictydiminished-with-firacode/default.nix

@@ -11,6 +11,13 @@ stdenv.mkDerivation rec {
   };
 
   buildPhase = ''
+    substituteInPlace apply-feature.py --replace \
+      'ricty = ttLib.TTFont(options.in_font)' \
+      'ricty = ttLib.TTFont(options.in_font, recalcTimestamp=False)'
+    substituteInPlace build-py3.py --replace \
+      'datetime.date.today()' \
+      'datetime.date.fromtimestamp(float(os.environ["SOURCE_DATE_EPOCH"]))'
+
     make
   '';
 
@@ -28,6 +35,10 @@ stdenv.mkDerivation rec {
     ]))
   ];
 
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = "09ldviapljn4bb1mcxap2pkz7cq3wr2k2qialbnav5y7ii82acd4";
+
   meta = with stdenv.lib; {
     homepage = https://github.com/hakatashi/RictyDiminished-with-FiraCode;
     description = "The best Japanese programming font meets the awesone ligatures of Firacode";

pkgs/data/fonts/unscii/default.nix

@@ -23,6 +23,11 @@ stdenv.mkDerivation rec {
     cp *.svg "$out/share/fonts/svg"
     cp *.woff "$out/share/fonts/web"
   '';
+
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = "03zvczdka665zcyf9fjrnx434mwpr5q8396j34kjmc67w7nhc49r";
+
   meta = {
     inherit version;
     description = ''Bitmapped character-art-friendly Unicode fonts'';

pkgs/data/fonts/xits-math/default.nix

@@ -15,6 +15,10 @@ stdenv.mkDerivation rec {
 
   postPatch = ''
     rm *.otf
+
+    substituteInPlace tools/postprocess.py --replace \
+      'font = ttLib.TTFont(sys.argv[1])' \
+      'font = ttLib.TTFont(sys.argv[1], recalcTimestamp=False)'
   '';
 
   installPhase = ''
@@ -22,6 +26,10 @@ stdenv.mkDerivation rec {
     cp *.otf $out/share/fonts/opentype
   '';
 
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = "00xycmb9ka67j5s66nkng53y8q6362igisxz04zb58r2717jk50m";
+
   meta = with stdenv.lib; {
     homepage = https://github.com/khaledhosny/xits-math;
     description = "OpenType implementation of STIX fonts with math support";