From 8e3f467b3a40bec98faf5c326cbbb20642ca39b7 Mon Sep 17 00:00:00 2001
From: Mikael Voss <mvs@nyantec.com>
Date: Fri, 23 Aug 2024 09:18:16 +0200
Subject: [PATCH] Add scripts to run headless Wayland sessions

---
 package/wayland-headless/package.nix | 36 ++++++++++++++++++++++++++++
 package/wayland-headless/wl-run.sh   | 11 +++++++++
 package/wayland-headless/xvfb-run.sh | 12 ++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 package/wayland-headless/package.nix
 create mode 100644 package/wayland-headless/wl-run.sh
 create mode 100644 package/wayland-headless/xvfb-run.sh

diff --git a/package/wayland-headless/package.nix b/package/wayland-headless/package.nix
new file mode 100644
index 0000000..7c42ef6
--- /dev/null
+++ b/package/wayland-headless/package.nix
@@ -0,0 +1,36 @@
+{ ... }: { stdenvNoCC, lib, shellcheck-minimal, runtimeShell, cage }:
+
+stdenvNoCC.mkDerivation {
+  name = "wayland-headless";
+
+  nativeInstallCheckInputs = [ shellcheck-minimal ];
+
+  dontUnpack = true;
+  dontConfigure = true;
+  dontBuild = true;
+  doInstallCheck = true;
+
+  installPhase = ''
+    mkdir -p "$out/bin"
+
+    substitute ${./wl-run.sh} "$out/bin/wl-run" \
+      --subst-var-by runtimeShell ${lib.escapeShellArg runtimeShell} \
+      --subst-var-by cage ${lib.escapeShellArg cage}
+
+    substitute ${./xvfb-run.sh} "$out/bin/xvfb-run" \
+      --subst-var-by runtimeShell ${lib.escapeShellArg runtimeShell} \
+      --subst-var out
+
+    chmod +x "$out/bin/"{wl-run,xvfb-run}
+  '';
+
+  installCheckPhase = ''
+    runHook preInstallCheck
+    shellcheck "$out/bin/"{wl-run,xvfb-run}
+    runHook postInstallCheck
+  '';
+
+  meta = {
+    inherit (cage.meta) platforms;
+  };
+}
diff --git a/package/wayland-headless/wl-run.sh b/package/wayland-headless/wl-run.sh
new file mode 100644
index 0000000..6ae0182
--- /dev/null
+++ b/package/wayland-headless/wl-run.sh
@@ -0,0 +1,11 @@
+#!@runtimeShell@
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+WLR_BACKENDS=headless \
+WLR_LIBINPUT_NO_DEVICES=1 \
+WLR_RENDERER=pixman \
+XDG_RUNTIME_DIR="$(mktemp -d)" \
+  exec '@cage@/bin/cage' -- "$@"
diff --git a/package/wayland-headless/xvfb-run.sh b/package/wayland-headless/xvfb-run.sh
new file mode 100644
index 0000000..a5a71e7
--- /dev/null
+++ b/package/wayland-headless/xvfb-run.sh
@@ -0,0 +1,12 @@
+#!@runtimeShell@
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+# Discard all options
+while [[ "$1" =~ ^- ]]; do
+  shift
+done
+
+exec '@out@/bin/wl-run' "$@"