man-pages: provide simple install check

pkgs/by-name/ma/man-pages/package.nix

@@ -3,6 +3,7 @@
   stdenv,
   fetchurl,
   directoryListingUpdater,
+  man,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -14,8 +15,11 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-3aou2i6NKG++wiHRFfEtP/9dNsxQZs3+zI0koljVixk=";
   };
 
+  nativeInstallCheckInputs = [ man ];
+
   dontBuild = true;
   enableParallelInstalling = true;
+  doInstallCheck = true;
 
   makeFlags = [
     "-R"
@@ -33,6 +37,17 @@ stdenv.mkDerivation (finalAttrs: {
     export DISTDATE="$(date --utc --date="@$SOURCE_DATE_EPOCH")"
   '';
 
+  installCheckPhase = ''
+    runHook preInstallCheck
+
+    # Check for a few well‐known man pages
+    for page in ldd write printf null hosts random ld.so; do
+      man -M "$out/share/man" -P cat "$page" >/dev/null
+    done
+
+    runHook postInstallCheck
+  '';
+
   passthru.updateScript = directoryListingUpdater {
     url = "https://www.kernel.org/pub/linux/docs/man-pages/";
   };