hplip: canonicalise 56-hpmud.rules' paths if installed

Fixes #14338.

pkgs/misc/drivers/hplip/3.15.9.nix

@@ -2,6 +2,7 @@
 , pkgconfig
 , cups, zlib, libjpeg, libusb1, pythonPackages, sane-backends, dbus, usbutils
 , net_snmp, polkit
+, bash, coreutils, utillinux
 , qtSupport ? true, qt4, pyqt4
 , withPlugin ? false
 }:
@@ -112,8 +113,7 @@ stdenv.mkDerivation {
 
   enableParallelBuilding = true;
 
-  postInstall = stdenv.lib.optionalString withPlugin
-    ''
+  postInstall = stdenv.lib.optionalString withPlugin ''
     sh ${plugin} --noexec --keep
     cd plugin_tmp
 
@@ -175,6 +175,14 @@ stdenv.mkDerivation {
     wrapPythonProgramsIn $out/lib "$out $pythonPath"
 
     substituteInPlace $out/etc/hp/hplip.conf --replace /usr $out
+  '' + stdenv.lib.optionalString (!withPlugin) ''
+    # A udev rule to notify users that they need the binary plugin.
+    # Needs a lot of patching but might save someone a bit of confusion:
+    substituteInPlace $out/etc/udev/rules.d/56-hpmud.rules \
+      --replace {,${bash}}/bin/sh \
+      --replace {/usr,${coreutils}}/bin/nohup \
+      --replace {,${utillinux}/bin/}logger \
+      --replace {/usr,$out}/bin
   '';
 
   meta = with stdenv.lib; {

pkgs/misc/drivers/hplip/default.nix

@@ -2,6 +2,7 @@
 , pkgconfig
 , cups, zlib, libjpeg, libusb1, pythonPackages, sane-backends, dbus, usbutils
 , net_snmp, polkit
+, bash, coreutils, utillinux
 , qtSupport ? true, qt4, pyqt4
 , withPlugin ? false
 }:
@@ -112,8 +113,7 @@ stdenv.mkDerivation {
 
   enableParallelBuilding = true;
 
-  postInstall = stdenv.lib.optionalString withPlugin
-    ''
+  postInstall = stdenv.lib.optionalString withPlugin ''
     sh ${plugin} --noexec --keep
     cd plugin_tmp
 
@@ -175,6 +175,14 @@ stdenv.mkDerivation {
     wrapPythonProgramsIn $out/lib "$out $pythonPath"
 
     substituteInPlace $out/etc/hp/hplip.conf --replace /usr $out
+  '' + stdenv.lib.optionalString (!withPlugin) ''
+    # A udev rule to notify users that they need the binary plugin.
+    # Needs a lot of patching but might save someone a bit of confusion:
+    substituteInPlace $out/etc/udev/rules.d/56-hpmud.rules \
+      --replace {,${bash}}/bin/sh \
+      --replace {/usr,${coreutils}}/bin/nohup \
+      --replace {,${utillinux}/bin/}logger \
+      --replace {/usr,$out}/bin
   '';
 
   meta = with stdenv.lib; {