class Fakeroot < Formula
  desc "Provide a fake root environment"
  homepage "https://tracker.debian.org/pkg/fakeroot"
  url "https://deb.debian.org/debian/pool/main/f/fakeroot/fakeroot_1.23.orig.tar.xz"
  sha256 "009cd6696a931562cf1c212bb57ca441a4a2d45cd32c3190a35c7ae98506f4f6"

  bottle do
    cellar :any
    sha256 "3451446e08a5a0dcc125fac9ec5e076abb7859331a1ef63afeb3130cdc1665be" => :mojave
    sha256 "ec1b436ab733127e356e7b7f5c80ea4ef04817e13c6715f4321a46051f67ef12" => :high_sierra
    sha256 "7fc1ccead9bbcbd8f47d166830ce2ea0efcb6e60cd2fe69ae356a175028077a6" => :sierra
    sha256 "4e0afd9c97c78fa0bf2c16420d21d26e4320a0a3eac94ba381b132f701ea24dc" => :el_capitan
  end

  # Compile is broken. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766649
  # Patches submitted upstream on 24/10/2014, but no reply from maintainer thus far.
  patch do
    url "https://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=0001-Implement-openat-2-wrapper-which-handles-optional-ar.patch;att=1;bug=766649"
    sha256 "1c9a24aae6dc2a82fa7414454c12d3774991f6264dd798d7916972335602308d"
  end

  patch do
    url "https://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=0002-OS-X-10.10-introduced-id_t-int-in-gs-etpriority.patch;att=2;bug=766649"
    sha256 "e0823a8cfe9f4549eb4f0385a9cd611247c3a11c0452b5f80ea6122af4854b7c"
  end

  # This patch handles mapping the variadic arguments to the system openat to
  # the fixed arguments for our next_openat function.
  # Patch has been submitted to
  # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766649
  patch :DATA

  def install
    system "./configure", "--disable-dependency-tracking",
                          "--disable-static",
                          "--disable-silent-rules",
                          "--prefix=#{prefix}"

    # Yosemite introduces an openat function, which has variadic arguments,
    # which the "fancy" wrapping scheme used by fakeroot does not handle. So we
    # have to patch the generated file after it is generated.
    # Patch has been submitted with detailed explanation to
    # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766649
    system "make", "wraptmpf.h"
    (buildpath/"patch-for-wraptmpf-h").write <<~EOS
      diff --git a/wraptmpf.h b/wraptmpf.h
      index dbfccc9..0e04771 100644
      --- a/wraptmpf.h
      +++ b/wraptmpf.h
      @@ -575,6 +575,10 @@ static __inline__ int next_mkdirat (int dir_fd, const char *pathname, mode_t mod
       #endif /* HAVE_MKDIRAT */
       #ifdef HAVE_OPENAT
       extern int openat (int dir_fd, const char *pathname, int flags, ...);
      +static __inline__ int next_openat (int dir_fd, const char *pathname, int flags, mode_t mode) __attribute__((always_inline));
      +static __inline__ int next_openat (int dir_fd, const char *pathname, int flags, mode_t mode) {
      +  return openat (dir_fd, pathname, flags, mode);
      +}

       #endif /* HAVE_OPENAT */
       #ifdef HAVE_RENAMEAT
    EOS

    system "patch < patch-for-wraptmpf-h"

    system "make"
    system "make", "install"
  end

  test do
    if MacOS.version <= :yosemite
      assert_equal "root", shell_output("#{bin}/fakeroot whoami").strip
    else
      assert_match version.to_s, shell_output("#{bin}/fakeroot -v")
    end
  end
end

__END__
index 15fdd1d..29d738d 100644
--- a/libfakeroot.c
+++ b/libfakeroot.c
@@ -2446,6 +2446,6 @@ int openat(int dir_fd, const char *pathname, int flags, ...)
         va_end(args);
         return next_openat(dir_fd, pathname, flags, mode);
     }
-    return next_openat(dir_fd, pathname, flags);
+    return next_openat(dir_fd, pathname, flags, NULL);
 }
 #endif