From a361f807a95d8601b9730e8c15233b6b2a4d312d Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Thu, 31 Mar 2022 16:57:40 +0000
Subject: [PATCH] gpu-dawn: fix error when curl is unavailable / not installed

Fixes hexops/mach#197

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 gpu-dawn/build.zig | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/gpu-dawn/build.zig b/gpu-dawn/build.zig
index a8f52e2d..ce4c0c93 100644
--- a/gpu-dawn/build.zig
+++ b/gpu-dawn/build.zig
@@ -313,7 +313,7 @@ fn downloadBinary(
     is_windows: bool,
     version: []const u8,
 ) !void {
-    try ensureCanDownloadFiles(allocator);
+    ensureCanDownloadFiles(allocator);
 
     const download_dir = try std.fs.path.join(allocator, &.{ target_cache_dir, "download" });
     try std.fs.cwd().makePath(download_dir);
@@ -454,7 +454,10 @@ fn ensureCanDownloadFiles(allocator: std.mem.Allocator) !void {
         .allocator = allocator,
         .argv = argv,
         .cwd = thisDir(),
-    });
+    }) catch { // e.g. FileNotFound
+        std.log.err("mach: error: 'curl --version' failed. Is curl not installed?", .{});
+        std.process.exit(1);
+    };
     defer {
         allocator.free(result.stderr);
         allocator.free(result.stdout);