Merge pull request #169080 from iblech/patch-texlive-repro

texlive: improve reproducibility

pkgs/tools/typesetting/tex/texlive/combine.nix

@@ -225,7 +225,7 @@ in (buildEnv {
 
     perl `type -P mktexlsr.pl` --sort ./share/texmf
     ${bin.texlinks}/bin/texlinks "$out/bin" && wrapBin
-    perl `type -P fmtutil.pl` --sys --all | grep '^fmtutil' # too verbose
+    FORCE_SOURCE_DATE=1 perl `type -P fmtutil.pl` --sys --all | grep '^fmtutil' # too verbose
     #${bin.texlinks}/bin/texlinks "$out/bin" && wrapBin # do we need to regenerate format links?
 
     # Disable unavailable map files
@@ -233,6 +233,9 @@ in (buildEnv {
     # Regenerate the map files (this is optional)
     perl `type -P updmap.pl` --sys --force
 
+    # sort entries to improve reproducibility
+    [[ -f "$TEXMFSYSCONFIG"/web2c/updmap.cfg ]] && sort -o "$TEXMFSYSCONFIG"/web2c/updmap.cfg "$TEXMFSYSCONFIG"/web2c/updmap.cfg
+
     perl `type -P mktexlsr.pl` --sort ./share/texmf-* # to make sure
   '' +
     # install (wrappers for) scripts, based on a list from upstream texlive
@@ -299,7 +302,12 @@ in (buildEnv {
       )
     fi
   ''
-    + bin.cleanBrokenLinks
+    + bin.cleanBrokenLinks +
+  # Get rid of all log files. They are not needed, but take up space
+  # and render the build unreproducible by their embedded timestamps.
+  ''
+    find $TEXMFSYSVAR/web2c -name '*.log' -delete
+  ''
   ;
 }).overrideAttrs (_: { allowSubstitutes = true; })
 # TODO: make TeX fonts visible by fontconfig: it should be enough to install an appropriate file