From e29253ad9b847873fa8c5d736a45951d67623eef Mon Sep 17 00:00:00 2001
From: Jan Tojnar <jtojnar@gmail.com>
Date: Sun, 3 Apr 2022 19:01:27 +0200
Subject: [PATCH] gnome.eog: Hardcode library path in gir

By default, gobject-introspection refers to libraries using their
file name in the GIR file. Since we do not have FHS to reliably
find libraries by their name, we are patching gobject-introspection
to use absolute paths.

This works fine for libraries installed to "$out/lib" but when a different
path is used, the hard-coded absolute path will be incorrect.
To deal with this case, we also patch Meson to be able
to pass the install_dir to gobject-introspection.
But it currently only passes the data for targets
that have absolute install_dir set.

To have correct libeog path, we therefore need to absolutize the install_dir.
---
 pkgs/desktops/gnome/core/eog/default.nix            |  7 +++++++
 pkgs/desktops/gnome/core/eog/fix-gir-lib-path.patch | 13 +++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 pkgs/desktops/gnome/core/eog/fix-gir-lib-path.patch

diff --git a/pkgs/desktops/gnome/core/eog/default.nix b/pkgs/desktops/gnome/core/eog/default.nix
index 08baf9022f71..9a152921994d 100644
--- a/pkgs/desktops/gnome/core/eog/default.nix
+++ b/pkgs/desktops/gnome/core/eog/default.nix
@@ -38,6 +38,13 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-+zW/tRZ6QhIfWae5t6wNdbvQUXua/W2Rgx6E01c13fg=";
   };
 
+  patches = [
+    # Fix path to libeog.so in the gir file.
+    # We patch gobject-introspection to hardcode absolute paths but
+    # our Meson patch will only pass the info when install_dir is absolute as well.
+    ./fix-gir-lib-path.patch
+  ];
+
   nativeBuildInputs = [
     meson
     ninja
diff --git a/pkgs/desktops/gnome/core/eog/fix-gir-lib-path.patch b/pkgs/desktops/gnome/core/eog/fix-gir-lib-path.patch
new file mode 100644
index 000000000000..eb087b58a317
--- /dev/null
+++ b/pkgs/desktops/gnome/core/eog/fix-gir-lib-path.patch
@@ -0,0 +1,13 @@
+diff --git a/src/meson.build b/src/meson.build
+index cc9d3856..f909836d 100644
+--- a/src/meson.build
++++ b/src/meson.build
+@@ -165,7 +165,7 @@ libeog = shared_library(
+   link_args: ldflags,
+   link_depends: symbol_map,
+   install: true,
+-  install_dir: eog_pkglibdir,
++  install_dir: eog_prefix / eog_pkglibdir,
+ )
+ 
+ libeog_dep = declare_dependency(