cups-pdf: misc improvements in package, module, vmtest (#387364)

nixos/tests/all-tests.nix

···
   crabfit = handleTest ./crabfit.nix { };
   cri-o = handleTestOn [ "aarch64-linux" "x86_64-linux" ] ./cri-o.nix { };
   cryptpad = runTest ./cryptpad.nix;
-  cups-pdf = handleTest ./cups-pdf.nix { };
+  cups-pdf = runTest ./cups-pdf.nix;
   curl-impersonate = handleTest ./curl-impersonate.nix { };
   custom-ca = handleTest ./custom-ca.nix { };
   croc = handleTest ./croc.nix { };

nixos/tests/cups-pdf.nix

···
-import ./make-test-python.nix (
-  { lib, pkgs, ... }:
-  {
-    name = "cups-pdf";
+{ hostPkgs, lib, ... }:
+{
+  name = "cups-pdf";
 
-    nodes.machine =
-      { pkgs, ... }:
-      {
-        imports = [ ./common/user-account.nix ];
-        environment.systemPackages = [ pkgs.poppler-utils ];
-        fonts.packages = [ pkgs.dejavu_fonts ]; # yields more OCR-able pdf
-        services.printing.cups-pdf.enable = true;
-        services.printing.cups-pdf.instances = {
-          opt = { };
-          noopt.installPrinter = false;
-        };
-        hardware.printers.ensurePrinters = [
-          {
-            name = "noopt";
-            model = "CUPS-PDF_noopt.ppd";
-            deviceUri = "cups-pdf:/noopt";
-          }
-        ];
+  nodes.machine =
+    { pkgs, ... }:
+    {
+      imports = [ ./common/user-account.nix ];
+      environment.systemPackages = [ pkgs.poppler-utils ];
+      fonts.packages = [ pkgs.dejavu_fonts ]; # yields more OCR-able pdf
+      services.printing.cups-pdf.enable = true;
+      services.printing.cups-pdf.instances = {
+        opt = { };
+        noopt.installPrinter = false;
       };
+      hardware.printers.ensurePrinters = [
+        {
+          name = "noopt";
+          model = "CUPS-PDF_noopt.ppd";
+          deviceUri = "cups-pdf:/noopt";
+        }
+      ];
+    };
 
-    # we cannot check the files with pdftotext, due to
-    # https://github.com/alexivkin/CUPS-PDF-to-PDF/issues/7
-    # we need `imagemagickBig` as it has ghostscript support
+  # we cannot check the files with pdftotext, due to
+  # https://github.com/alexivkin/CUPS-PDF-to-PDF/issues/7
+  # we need `imagemagickBig` as it has ghostscript support
 
-    testScript = ''
-      from subprocess import run
-      machine.wait_for_unit("multi-user.target")
-      for name in ("opt", "noopt"):
-          text = f"test text {name}".upper()
-          machine.wait_until_succeeds(f"lpstat -v {name}")
-          machine.succeed(f"su - alice -c 'echo -e \"\n  {text}\" | lp -d {name}'")
-          # wait until the pdf files are completely produced and readable by alice
-          machine.wait_until_succeeds(f"su - alice -c 'pdfinfo /var/spool/cups-pdf-{name}/users/alice/*.pdf'")
-          machine.succeed(f"cp /var/spool/cups-pdf-{name}/users/alice/*.pdf /tmp/{name}.pdf")
-          machine.copy_from_vm(f"/tmp/{name}.pdf", "")
-          run(f"${pkgs.imagemagickBig}/bin/convert -density 300 $out/{name}.pdf $out/{name}.jpeg", shell=True, check=True)
-          assert text.encode() in run(f"${lib.getExe pkgs.tesseract} $out/{name}.jpeg stdout", shell=True, check=True, capture_output=True).stdout
-    '';
+  testScript = ''
+    from subprocess import run
+    machine.wait_for_unit("multi-user.target")
+    for name in ("opt", "noopt"):
+        text = f"test text {name}".upper()
+        machine.wait_until_succeeds(f"lpstat -v {name}")
+        machine.succeed(f"su - alice -c 'echo -e \"\n  {text}\" | lp -d {name}'")
+        # wait until the pdf files are completely produced and readable by alice
+        machine.wait_until_succeeds(f"su - alice -c 'pdfinfo /var/spool/cups-pdf-{name}/users/alice/*.pdf'")
+        machine.succeed(f"cp /var/spool/cups-pdf-{name}/users/alice/*.pdf /tmp/{name}.pdf")
+        machine.copy_from_vm(f"/tmp/{name}.pdf", "")
+        run(f"${lib.getExe hostPkgs.imagemagickBig} -density 300 $out/{name}.pdf $out/{name}.jpeg", shell=True, check=True)
+        assert text.encode() in run(f"${lib.getExe hostPkgs.tesseract} $out/{name}.jpeg stdout", shell=True, check=True, capture_output=True).stdout
+  '';
 
-    meta.maintainers = [ lib.maintainers.yarny ];
-  }
-)
+  meta.maintainers = [ lib.maintainers.yarny ];
+}

pkgs/by-name/cu/cups-pdf-to-pdf/package.nix

···
   buildInputs = [ cups ];
 
   postPatch = ''
-    sed -r 's|(gscall, size, ")cp |\1${coreutils}/bin/cp |' cups-pdf.c -i
+    substituteInPlace cups-pdf.c \
+      --replace-fail '"cp ' '"${lib.getExe' coreutils "cp"} '
   '';
 
   # gcc command line is taken from original cups-pdf's README file
···
 
   passthru.tests.vmtest = nixosTests.cups-pdf;
 
-  meta = with lib; {
+  meta = {
     description = "CUPS backend that turns print jobs into searchable PDF files";
     homepage = "https://github.com/alexivkin/CUPS-PDF-to-PDF";
-    license = licenses.gpl2Only;
-    maintainers = [ maintainers.yarny ];
+    license = lib.licenses.gpl2Only;
+    maintainers = [ lib.maintainers.yarny ];
     longDescription = ''
       cups-pdf is a CUPS backend that generates a PDF file for each print job and puts this file
       into a folder on the local machine such that the print job's owner can access the file.