feat: create a nix package for sfcgal

Author: samrose

ansible/tasks/stage2/setup-extensions.yml

@@ -11,6 +11,10 @@
 #     apt-get install -y --no-install-recommends /tmp/extensions/*.deb
 # TODO remove
 
+# The following tasks were moved to stage 2 from the original ansible/tasks/setup-docker.yml
+# due to these configurations being required to be applied at this stage, after the database package
+# has been installed and before the database is started.
+# These tasks are required to be run before the database is started, as they modify the database configuration
 
 - name: pg_cron - set cron.database_name
   become: yes
@@ -79,4 +83,4 @@
 #   file:
 #     path: /tmp/extensions
 #     state: absent
-# TODO remove
+# TODO remove extensions are already packaged in the nix build

flake.nix

@@ -57,8 +57,10 @@
             #(import ./nix/overlays/gdal-small.nix)
 
           ];
+
         };
 
+        sfcgal = pkgs.callPackage ./nix/ext/sfcgal/sfcgal.nix { };
 
         # FIXME (aseipp): pg_prove is yet another perl program that needs
         # LOCALE_ARCHIVE set in non-NixOS environments. upstream this. once that's done, we
@@ -139,6 +141,7 @@
         #this var is a convenience setting to import the orioledb patched version of postgresql
         postgresql_orioledb_16 = oriole_pkgs.postgresql_orioledb_16;
 
+        
         # Create a 'receipt' file for a given postgresql package. This is a way
         # of adding a bit of metadata to the package, which can be used by other
         # tools to inspect what the contents of the install are: the PSQL
@@ -400,6 +403,8 @@
           #psql_16 = makePostgres "16";
           #psql_orioledb_16 = makeOrioleDbPostgres "16_23" postgresql_orioledb_16;
           pg_prove = pg_prove;
+          sfcgal = sfcgal;
+         
           # Start a version of the server.
           start-server =
             let

nix/ext/postgis.nix

@@ -13,10 +13,12 @@
 , libiconv
 , pcre2
 , nixosTests
+, callPackage
 }:
 
 let
   gdal = gdalMinimal;
+  sfcgal = callPackage ./sfcgal/sfcgal.nix { };
 in
 stdenv.mkDerivation rec {
   pname = "postgis";
@@ -29,7 +31,7 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-miohnaAFoXMKOdGVmhx87GGbHvsAm2W+gP/CW60pkGg=";
   };
 
-  buildInputs = [ libxml2 postgresql geos proj gdal json_c protobufc pcre2.dev ]
+  buildInputs = [ libxml2 postgresql geos proj gdal json_c protobufc pcre2.dev sfcgal ]
                 ++ lib.optional stdenv.isDarwin libiconv;
   nativeBuildInputs = [ perl pkg-config ];
   dontDisableStatic = true;
@@ -40,7 +42,7 @@ stdenv.mkDerivation rec {
 
   preConfigure = ''
     sed -i 's@/usr/bin/file@${file}/bin/file@' configure
-    configureFlags="--datadir=$out/share/postgresql --datarootdir=$out/share/postgresql --bindir=$out/bin --docdir=$doc/share/doc/${pname} --with-gdalconfig=${gdal}/bin/gdal-config --with-jsondir=${json_c.dev} --disable-extension-upgrades-install"
+    configureFlags="--datadir=$out/share/postgresql --datarootdir=$out/share/postgresql --bindir=$out/bin --docdir=$doc/share/doc/${pname} --with-gdalconfig=${gdal}/bin/gdal-config --with-jsondir=${json_c.dev} --disable-extension-upgrades-install --with-sfcgal"
 
     makeFlags="PERL=${perl}/bin/perl datadir=$out/share/postgresql pkglibdir=$out/lib bindir=$out/bin docdir=$doc/share/doc/${pname}"
   '';

nix/ext/sfcgal/sfcgal.nix

@@ -0,0 +1,30 @@
+{ lib, stdenv, fetchFromGitLab, cgal, cmake, pkg-config, gmp, mpfr, boost }:
+
+stdenv.mkDerivation rec {
+  pname = "sfcgal";
+  version = "61f3b08ade49493b56c6bafa98c7c1f84addbc10";
+
+  src = fetchFromGitLab {
+    owner = "sfcgal";
+    repo = "SFCGAL";
+    rev = "${version}";
+    hash = "sha256-nKSqiFyMkZAYptIeShb1zFg9lYSny3kcGJfxdeTFqxw=";
+  };
+
+  nativeBuildInputs = [ cmake pkg-config cgal gmp mpfr boost ];
+
+  cmakeFlags = [ "-DCGAL_DIR=${cgal}" "-DCMAKE_PREFIX_PATH=${cgal}" ];
+
+
+  postPatch = ''
+    substituteInPlace sfcgal.pc.in \
+      --replace '$'{prefix}/@CMAKE_INSTALL_LIBDIR@ @CMAKE_INSTALL_FULL_LIBDIR@
+  '';
+
+  meta = with lib; {
+    description = "A wrapper around CGAL that intents to implement 2D and 3D operations on OGC standards models";
+    homepage = "https://sfcgal.gitlab.io/SFCGAL/";
+    license = licenses.gpl2Only;
+    maintainers = with maintainers; [ samrose ];
+  };
+}