postgresql: cleanup postgis (#54396)

postgis: cleanup

Another part of https://github.com/NixOS/nixpkgs/pull/38698, though I did cleanup even more.
Moving docs to separate output should save another 30MB.

I did pin poppler to 0.61 just to be sure GDAL doesn't break again next
time poppler changes internal APIs.

pkgs/servers/sql/postgresql/ext/postgis.nix

@@ -0,0 +1,67 @@
+{ fetchurl
+, stdenv
+, perl
+, libxml2
+, postgresql
+, geos
+, proj
+, gdal
+, json_c
+, pkgconfig
+, file
+}:
+stdenv.mkDerivation rec {
+  name = "postgis-${version}";
+  version = "2.5.1";
+
+  outputs = [ "out" "doc" ];
+
+  src = fetchurl {
+    url = "https://download.osgeo.org/postgis/source/postgis-${version}.tar.gz";
+    sha256 = "14bsh4kflp4bxilypkpmhrpldknc9s9vgiax8yfhxbisyib704zv";
+  };
+
+  buildInputs = [ libxml2 postgresql geos proj perl gdal json_c pkgconfig ];
+  dontDisableStatic = true;
+
+  # postgis config directory assumes /include /lib from the same root for json-c library
+  NIX_LDFLAGS = "-L${stdenv.lib.getLib json_c}/lib";
+
+  preConfigure = ''
+    sed -i 's@/usr/bin/file@${file}/bin/file@' configure
+    configureFlags="--datadir=$out/share --datarootdir=$out/share --bindir=$out/bin --with-gdalconfig=${gdal}/bin/gdal-config --with-jsondir=${json_c.dev}"
+
+    makeFlags="PERL=${perl}/bin/perl datadir=$out/share pkglibdir=$out/lib bindir=$out/bin"
+  '';
+  postConfigure = ''
+    sed -i "s|@mkdir -p \$(DESTDIR)\$(PGSQL_BINDIR)||g ;
+            s|\$(DESTDIR)\$(PGSQL_BINDIR)|$prefix/bin|g
+            " \
+        "raster/loader/Makefile";
+    sed -i "s|\$(DESTDIR)\$(PGSQL_BINDIR)|$prefix/bin|g
+            " \
+        "raster/scripts/python/Makefile";
+  '';
+
+  preInstall = ''
+    mkdir -p $out/bin
+  '';
+
+  # create aliases for all commands adding version information
+  postInstall = ''
+    for prog in $out/bin/*; do # */
+      ln -s $prog $prog-${version}
+    done
+
+    mkdir -p $doc/share/doc/postgis
+    mv doc/* $doc/share/doc/postgis/
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Geographic Objects for PostgreSQL";
+    homepage = http://postgis.refractions.net;
+    license = licenses.gpl2;
+    maintainers = [ maintainers.marcweber ];
+    platforms = platforms.linux;
+  };
+}

pkgs/servers/sql/postgresql/packages.nix

@@ -1,5 +1,12 @@
 self: super: {
 
+    postgis = super.callPackage ./ext/postgis.nix {
+        gdal = self.gdal.override {
+            postgresql = self.postgresql;
+            poppler = self.poppler_0_61;
+        };
+    };
+
     pg_repack = super.callPackage ./ext/pg_repack.nix { };
 
     pg_similarity = super.callPackage ./ext/pg_similarity.nix { };