Patch user agent with Windows Chrome

software/nayuos/instance.cfg

@@ -99,7 +99,7 @@ context =
 recipe = slapos.recipe.template:jinja2
 template = {{ software_dir }}/scripts/cros_full_build.in
 rendered = ${directory:run}/cros_full_build
-md5sum = e11a8ed3fc100ddf591469ca8ac75d52
+md5sum = 2191410a2e84d71164b9b13abdc95ef5
 mode = 0700
 context =
   key bash_path                         bin:bash
@@ -111,6 +111,7 @@ context =
   key keep_cache                        parameters:configuration.keep_cache
   key ebuilds_dir                       nayuos-ebuilds:location
   raw scripts_dir                       {{ software_dir }}/scripts
+  raw patches_dir                       {{ software_dir }}/patches
   raw logo_dir                          {{ software_dir }}/logo
 # packages to be copied from our overlay into ChromiuOS' overlay
 # those packages will be marked as dependency of root filesystem

software/nayuos/patches/user-agent.patch

+diff --git a/login_manager/chrome_setup.cc b/login_manager/chrome_setup.cc
+index cbe93f471..bd72cbb09 100644
+--- a/login_manager/chrome_setup.cc
++++ b/login_manager/chrome_setup.cc
+@@ -341,6 +341,9 @@ void AddSystemFlags(ChromiumCommandBuilder* builder) {
+   // On developer systems, set a flag to let the browser know.
+   if (builder->is_developer_end_user())
+     builder->AddArg("--system-developer-mode");
++  //Modify user agent to improve anonimity by preventing fingerprinting
++  const char* useragent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36"
++  builder->AddArg(base::StringPrintf("--user-agent=%s",useragent))
+ }
+ 
+ // Adds UI-related flags to the command line.

software/nayuos/scripts/cros_full_build.in

@@ -152,6 +152,10 @@ increase_revision_number ${CHROMIUM_OVERLAY}/chromeos-base/openssh-server-init/
 sed -i -n '/src_install/q;p' $(latest_ebuild ${CHROMIUM_OVERLAY}/chromeos-base/chromeos-sshd-init)
 increase_revision_number ${CHROMIUM_OVERLAY}/chromeos-base/chromeos-sshd-init/
 
+# modify user agent to improve anonimity by preventing fingerprinting
+NEWUSERAGENT="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36"
+sed -i "s!\$USERAGENTSTRING!${NEWUSERAGENT}!" {{patches}}/user-agent.patch
+patch {{ cros_location }}/{{ branch }}/src/platform2/login_manager/chrome_setup.cc {{patches}}/user-agent.patch
 
 # bashrc modifications
 BASH_EBUILD_DIR="${PORTAGE_STABLE}/app-shells/bash"

software/nayuos/software.cfg

@@ -26,7 +26,7 @@ recipe = slapos.recipe.template:jinja2
 template = ${:_profile_base_location_}/instance.cfg
 rendered = ${buildout:directory}/instance.cfg
 mode = 0644
-md5sum = 037a1c8c1091f07e8e5660b59223743f
+md5sum = 688e5495d5a21a19f228e1820b3aeaa8
 context =
   key software_dir            :_profile_base_location_
   key instance_dir            buildout:directory