Merge pull request 'fix minifakeroot on macos' (#2542) from minifakeroot into main

pkgs/flake-module.nix

@@ -28,6 +28,7 @@
         zt-tcp-relay = pkgs.callPackage ./zt-tcp-relay { };
         moonlight-sunshine-accept = pkgs.callPackage ./moonlight-sunshine-accept { };
         merge-after-ci = pkgs.callPackage ./merge-after-ci { inherit (config.packages) tea-create-pr; };
+        minifakeroot = pkgs.callPackage ./minifakeroot { };
         pending-reviews = pkgs.callPackage ./pending-reviews { };
         editor = pkgs.callPackage ./editor/clan-edit-codium.nix { };
         classgen = pkgs.callPackage ./classgen { };

pkgs/minifakeroot/default.nix

@@ -0,0 +1,18 @@
+{ stdenv }:
+let
+  varName = if stdenv.isDarwin then "DYLD_INSERT_LIBRARIES" else "LD_PRELOAD";
+  linkerFlags = if stdenv.isDarwin then "-dynamiclib" else "-shared";
+  sharedLibrary = stdenv.hostPlatform.extensions.sharedLibrary;
+in
+stdenv.mkDerivation {
+  name = "minifakeroot";
+  dontUnpack = true;
+  installPhase = ''
+    mkdir -p $out/lib
+    $CC ${linkerFlags} -o $out/lib/libfakeroot${sharedLibrary} ${./main.c}
+    mkdir -p $out/share/minifakeroot
+    cat > $out/share/minifakeroot/rc <<EOF
+    export ${varName}=$out/lib/libfakeroot${sharedLibrary}
+    EOF
+  '';
+}

pkgs/minifakeroot/main.c

@@ -0,0 +1,32 @@
+#include <stdint.h>
+#ifdef __APPLE__
+#include <unistd.h>
+#endif
+
+typedef uint32_t uid_t;
+
+#ifdef __APPLE__
+  struct dyld_interpose {
+    const void * replacement;
+    const void * replacee;
+  };
+  #define WRAPPER(ret, name) static ret _fakeroot_wrapper_##name
+  #define WRAPPER_DEF(name) \
+    __attribute__((used)) static struct dyld_interpose _fakeroot_interpose_##name \
+      __attribute__((section("__DATA,__interpose"))) = { &_fakeroot_wrapper_##name, &name };
+#else
+  #define WRAPPER(ret, name) ret name
+  #define WRAPPER_DEF(name)
+#endif
+
+WRAPPER(uid_t, geteuid)(const char * path, int flags, ...)
+{
+    return 0; // Fake root
+}
+WRAPPER_DEF(geteuid)
+
+WRAPPER(uid_t, getuid)(const char * path, int flags, ...)
+{
+    return 0; // Fake root
+}
+WRAPPER_DEF(getuid)