flock 0.4.0 (new formula)

Closes #103683.

Signed-off-by: Sean Molenaar <1484494+SMillerDev@users.noreply.github.com>
Signed-off-by: Rui Chen <rui@chenrui.dev>
Signed-off-by: BrewTestBot <1589480+BrewTestBot@users.noreply.github.com>

Formula/flock.rb

@@ -0,0 +1,25 @@
+class Flock < Formula
+  desc "Lock file during command"
+  homepage "https://github.com/discoteq/flock"
+  url "https://github.com/discoteq/flock/releases/download/v0.4.0/flock-0.4.0.tar.xz"
+  sha256 "01bbd497d168e9b7306f06794c57602da0f61ebd463a3210d63c1d8a0513c5cc"
+  license "ISC"
+
+  def install
+    system "./configure", *std_configure_args,
+                          "--disable-debug",
+                          "--disable-dependency-tracking",
+                          "--disable-silent-rules"
+    system "make", "install"
+  end
+
+  test do
+    pid = fork do
+      exec bin/"flock", "tmpfile", "sleep", "5"
+    end
+    sleep 1
+    assert shell_output("#{bin}/flock --nonblock tmpfile true", 1).empty?
+  ensure
+    Process.wait pid
+  end
+end