nix: install multicall binaries in postInstall

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I6a6a69646b6afeb1d9dda8d16e00f6f39b8046ff

nix/package.nix

@@ -1,6 +1,7 @@
 {
   lib,
   craneLib,
+  versionCheckHook,
 }: let
   pname = "stash";
   version = (builtins.fromTOML (builtins.readFile ../Cargo.toml)).package.version;
@@ -14,6 +15,7 @@
         (fs.fileFilter (file: builtins.any file.hasExt ["rs"]) (s + /src))
         (s + /Cargo.lock)
         (s + /Cargo.toml)
+        (s + /build.rs)
       ];
     };
 
@@ -28,11 +30,32 @@ in
 
     strictDeps = true;
 
+    # Whether cargo's target directory should be copied as an output
+    doInstallCargoArtifacts = true;
+
     # Install Systemd service for Stash into $out/share.
     # This can be used to use Stash in 'systemd.packages'
     postInstall = ''
       mkdir -p $out
       install -Dm755 ${../vendor/stash.service} $out/share/stash.service
+
+      # Since Crane doesn't have a good way of enforcing that our symlinks
+      # generated by the build wrapper are correctly linked, we should link
+      # them *manually*.
+      for bin in stash-copy stash-paste wl-copy wl-paste; do
+        ln -sf $out/bin/stash $out/bin/$bin
+      done
+    '';
+
+    nativeInstallCheckInputs = [versionCheckHook];
+    doInstallCheck = true;
+
+    # After the version check, let's see if all binaries are linked correctly.
+    # We could probably add a check phase to the versions of each.
+    postInstallCheck = ''
+      for bin in stash stash-copy stash-paste wl-copy wl-paste; do
+        [ -x "$out/bin/$bin" ] || { echo "$bin missing"; exit 1; }
+      done
     '';
 
     meta = {