proton: Introduce seccomp runtime option.

This then sets the WINESECCOMP environment variable to enable seccomp
filter for DOOM Eternal DRM (and others) without impacting other games.

2 files changed, 5 insertions, 0 deletions

diff --git a/README.md b/README.md
index 004f5bfb..bcd3d312 100644
--- a/README.md
+++ b/README.md
@@ -278,5 +278,6 @@ the Wine prefix. Removing the option will revert to the previous behavior.
 |                       | <tt>WINE_FULLSCREEN_INTEGER_SCALING</tt> | Enable integer scaling mode, to give sharp pixels when upscaling. |
 | <tt>cmdlineappend:</tt>|                               | Append the string after the colon as an argument to the game command. May be specified more than once. Escape commas and backslashes with a backslash. |
 | <tt>d9vk</tt>         | <tt>PROTON_USE_D9VK</tt>       | **Note: Obsoleted in Proton 5.0.** In older versions, use Vulkan-based DXVK instead of OpenGL-based wined3d for d3d9. |
+| <tt>seccomp</tt>      | <tt>PROTON_USE_SECCOMP</tt>    | Enable seccomp-bpf filter to emulate native syscalls, required for some DRM protections to work. |
 
 <!-- Target:  GitHub Flavor Markdown.  To test locally:  pandoc -f markdown_github -t html README.md  -->
diff --git a/proton b/proton
index 1f32b490..d1b0e6a2 100755
--- a/proton
+++ b/proton
@@ -482,6 +482,7 @@ class Session:
         self.check_environment("PROTON_NO_FSYNC", "nofsync")
         self.check_environment("PROTON_FORCE_LARGE_ADDRESS_AWARE", "forcelgadd")
         self.check_environment("PROTON_OLD_GL_STRING", "oldglstr")
+        self.check_environment("PROTON_USE_SECCOMP", "seccomp")
 
         if not "noesync" in self.compat_config:
             self.env["WINEESYNC"] = "1"
@@ -489,6 +490,9 @@ class Session:
         if not "nofsync" in self.compat_config:
             self.env["WINEFSYNC"] = "1"
 
+        if "seccomp" in self.compat_config:
+            self.env["WINESECCOMP"] = "1"
+
         if "oldglstr" in self.compat_config:
             #mesa override
             self.env["MESA_EXTENSION_MAX_YEAR"] = "2003"