From 96c7d09ed7700a08bd86ea0c4b1e058fa181b4be Mon Sep 17 00:00:00 2001
From: Sergei Zimmerman <145775305+xokdvium@users.noreply.github.com>
Date: Fri, 25 Oct 2024 13:49:54 +0300
Subject: [PATCH] flawz: fix cross-compilation

Use emulation to build man pages and completions when available.
---
 pkgs/by-name/fl/flawz/package.nix | 37 +++++++++++++++++++------------
 1 file changed, 23 insertions(+), 14 deletions(-)

diff --git a/pkgs/by-name/fl/flawz/package.nix b/pkgs/by-name/fl/flawz/package.nix
index 4a2e56673f96..317005c1414f 100644
--- a/pkgs/by-name/fl/flawz/package.nix
+++ b/pkgs/by-name/fl/flawz/package.nix
@@ -7,6 +7,7 @@
   sqlite,
   installShellFiles,
   stdenv,
+  buildPackages,
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -36,23 +37,31 @@ rustPlatform.buildRustPackage rec {
     "man"
   ];
 
-  postInstall = ''
-    export OUT_DIR=$(mktemp -d)
+  postInstall =
+    let
+      emulator = stdenv.hostPlatform.emulator buildPackages;
+      flawz-mangen = "${emulator} $out/bin/flawz-mangen";
+      flawz-completions = "${emulator} $out/bin/flawz-completions";
+    in
+    lib.optionalString (stdenv.hostPlatform.emulatorAvailable buildPackages) ''
+      export OUT_DIR=$(mktemp -d)
 
-    # Generate the man pages
-    cargo run --bin flawz-mangen
-    installManPage $OUT_DIR/flawz.1
+      # Generate the man pages
+      ${flawz-mangen}
+      installManPage $OUT_DIR/flawz.1
 
-    # Generate shell completions
-    cargo run --bin flawz-completions
-    installShellCompletion \
-      --bash $OUT_DIR/flawz.bash \
-      --fish $OUT_DIR/flawz.fish \
-      --zsh $OUT_DIR/_flawz
+      # Generate shell completions
+      ${flawz-completions}
+      installShellCompletion \
+        --bash $OUT_DIR/flawz.bash \
+        --fish $OUT_DIR/flawz.fish \
+        --zsh $OUT_DIR/_flawz
 
-    # Clean up temporary directory
-    rm -rf $OUT_DIR
-  '';
+      # Clean up temporary directory
+      rm -rf $OUT_DIR
+      # No need for these binaries to end up in the output
+      rm $out/bin/flawz-{completions,mangen}
+    '';
 
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