dblab: fix build error

pkgs/by-name/db/dblab/package.nix

@@ -1,5 +1,6 @@
 {
   lib,
+  stdenv,
   buildGoModule,
   fetchFromGitHub,
 }:
@@ -15,7 +16,10 @@ buildGoModule (finalAttrs: {
     hash = "sha256-0tkIDWAub+wfoJ760m1kU7XYnGNner/zLtCod6UPF60=";
   };
 
-  vendorHash = "sha256-B5wyERNUkJIrKjKET9HX3F43CFW6aBtzAarkAuhxw9o=";
+  vendorHash = "sha256-UGnbXjXnZ3EVcAk0ZTaV2wWWXv5nsbyNlTv8PMl2rP4=";
+  # Fix case-insensitive conflicts producing platform-dependent checksums
+  # https://github.com/microsoft/go-mssqldb/issues/234
+  proxyVendor = true;
 
   ldflags = [
     "-s"
@@ -23,7 +27,20 @@ buildGoModule (finalAttrs: {
   ];
 
   doCheck = true;
-  checkFlags = [ "-short" ]; # Skip Docker-based integration tests
+  preCheck = lib.optionalString stdenv.hostPlatform.isDarwin ''
+    # modernc reads /etc/protocols during package init, which Darwin sandboxing blocks.
+    go mod download modernc.org/libc
+    chmod -R u+w "$GOPATH/pkg/mod/modernc.org/libc@"*
+    substituteInPlace "$GOPATH"/pkg/mod/modernc.org/libc@*/honnef.co/go/netdb/netdb.go \
+      --replace-fail '!os.IsNotExist(err)' '!os.IsNotExist(err) && !os.IsPermission(err)'
+  '';
+  checkFlags = [
+    "-short"
+  ]
+  ++ lib.optionals stdenv.hostPlatform.isDarwin [
+    # Tries to bind a local TCP listener, which Darwin sandboxing blocks.
+    "-skip=^TestSSHKeyFileAuthentication$"
+  ];
 
   meta = {
     description = "Database client every command line junkie deserves";