From 027c5d4603059eb17afe76e337429d70ff3b765f Mon Sep 17 00:00:00 2001
From: Joe Bryan <joemfb@gmail.com>
Date: Mon, 15 Mar 2021 15:20:57 -0700
Subject: [PATCH] build: patch lmdb to use F_FULLFSYNC on darwin

---
 nix/overlays/native.nix          | 11 +++++++++++
 nix/pkgs/lmdb/darwin-fsync.patch | 13 +++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 nix/pkgs/lmdb/darwin-fsync.patch

diff --git a/nix/overlays/native.nix b/nix/overlays/native.nix
index 2ab55e3751..20d6b1ff9b 100644
--- a/nix/overlays/native.nix
+++ b/nix/overlays/native.nix
@@ -25,4 +25,15 @@ in {
     ldapSupport = false;
     brotliSupport = false;
   };
+
+  lmdb = prev.lmdb.overrideAttrs (attrs: {
+    patches =
+      if builtins.currentSystem != "x86_64-darwin"
+      then
+        attrs.patches
+      else
+        optionalList attrs.patches ++ [
+          ../pkgs/lmdb/darwin-fsync.patch
+        ];
+  });
 }
diff --git a/nix/pkgs/lmdb/darwin-fsync.patch b/nix/pkgs/lmdb/darwin-fsync.patch
new file mode 100644
index 0000000000..961b8a1ffd
--- /dev/null
+++ b/nix/pkgs/lmdb/darwin-fsync.patch
@@ -0,0 +1,13 @@
+diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
+index fe65e30..0070215 100644
+--- a/libraries/liblmdb/mdb.c
++++ b/libraries/liblmdb/mdb.c
+@@ -2526,7 +2526,7 @@ mdb_env_sync(MDB_env *env, int force)
+ 					rc = ErrCode();
+ 			} else
+ #endif
+-			if (MDB_FDATASYNC(env->me_fd))
++			if (fcntl(env->me_fd, F_FULLFSYNC, 0))
+ 				rc = ErrCode();
+ 		}
+ 	}