[PATCH v3 3/7] EmulatorPkg: Add Platform CI and configuration for Core CI

["Michael Kubacki" <michael.kubacki@outlook.com>]

From: Sean Brogan <sean.brogan@microsoft.com>

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2570

Add new Azure Pipeline definitions to build and run EmulatorPkg with:
  * Ubuntu GCC5
  * Windows VS2019
Add PyTool based build of EmulatorPkg
Add EmulatorPkg.ci.yaml for Core CI
Add ReadMe.md for details and instructions

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Andrew Fish <afish@apple.com>
Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Sean Brogan <sean.brogan@microsoft.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Bret Barkelew <bret.barkelew@microsoft.com>
---
 EmulatorPkg/EmulatorPkg.ci.yaml                           |  85 ++++++
 EmulatorPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml    |  95 +++++++
 EmulatorPkg/PlatformCI/.azurepipelines/Windows-VS2019.yml |  85 ++++++
 EmulatorPkg/PlatformCI/PlatformBuild.py                   | 272 ++++++++++++++++++++
 EmulatorPkg/PlatformCI/ReadMe.md                          | 128 +++++++++
 5 files changed, 665 insertions(+)

diff --git a/EmulatorPkg/EmulatorPkg.ci.yaml b/EmulatorPkg/EmulatorPkg.ci.yaml
new file mode 100644
index 000000000000..81f81780ec76
--- /dev/null
+++ b/EmulatorPkg/EmulatorPkg.ci.yaml
@@ -0,0 +1,85 @@
+## @file
+# Core CI configuration for EmulatorPkg
+#
+# EmulatorPkg is part of Platform Ci for builds so this is only
+# used for code analysis.
+#
+# Copyright (c) Microsoft Corporation
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+{
+    ## options defined .pytool/Plugin/CompilerPlugin
+    "CompilerPlugin": {
+        "DscPath": "" # Don't support this test
+    },
+
+    ## options defined .pytool/Plugin/HostUnitTestCompilerPlugin
+    "HostUnitTestCompilerPlugin": {
+        "DscPath": "" # Don't support this test
+    },
+
+    ## options defined .pytool/Plugin/CharEncodingCheck
+    "CharEncodingCheck": {
+        "IgnoreFiles": []
+    },
+
+    ## options defined .pytool/Plugin/DependencyCheck
+    "DependencyCheck": {
+        "AcceptableDependencies": [
+            # For this platform all packages are allowed???
+            "MdePkg/MdePkg.dec",
+            "MdeModulePkg/MdeModulePkg.dec",
+            "EmulatorPkg/EmulatorPkg.dec",
+            "NetworkPkg/NetworkPkg.dec",
+            "EmbeddedPkg/EmbeddedPkg.dec", ## is this one OK??
+        ],
+        # For host based unit tests
+        "AcceptableDependencies-HOST_APPLICATION":[
+            "UnitTestFrameworkPkg/UnitTestFrameworkPkg.dec"
+        ],
+        # For UEFI shell based apps
+        "AcceptableDependencies-UEFI_APPLICATION":[],
+        "IgnoreInf": []
+    },
+
+    ## options defined .pytool/Plugin/DscCompleteCheck
+    "DscCompleteCheck": {
+        "IgnoreInf": [""],
+        "DscPath": ""  # Don't support this test
+    },
+
+    ## options defined .pytool/Plugin/HostUnitTestDscCompleteCheck
+    "HostUnitTestDscCompleteCheck": {
+        "IgnoreInf": [""],
+        "DscPath": "" # Don't support this test
+    },
+
+    ## options defined .pytool/Plugin/GuidCheck
+    "GuidCheck": {
+        "IgnoreGuidName": [],
+        "IgnoreGuidValue": [],
+        "IgnoreFoldersAndFiles": [],
+        "IgnoreDuplicates": [],
+    },
+
+    ## options defined .pytool/Plugin/LibraryClassCheck
+    "LibraryClassCheck": {
+        "IgnoreHeaderFile": []
+    },
+
+    ## options defined .pytool/Plugin/SpellCheck
+    "SpellCheck": {
+        "AuditOnly": True,           # Fails right now with over 270 errors
+        "IgnoreFiles": [],           # use gitignore syntax to ignore errors in matching files
+        "ExtendWords": [
+            "setjump",
+            "plong",
+            "lparam",
+            "lpdword",
+            "lpthread",
+            "lresult",
+        ],           # words to extend to the dictionary for this package
+        "IgnoreStandardPaths": [],   # Standard Plugin defined paths that should be ignore
+        "AdditionalIncludePaths": [] # Additional paths to spell check (wildcards supported)
+    }
+}
diff --git a/EmulatorPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml b/EmulatorPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml
new file mode 100644
index 000000000000..12ef8226ff54
--- /dev/null
+++ b/EmulatorPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml
@@ -0,0 +1,95 @@
+## @file
+# Azure Pipeline build file for building a platform.
+#
+# Platform: EmulatorPkg
+# OS: Ubuntu
+# Toolchain: GCC5
+#
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+trigger:
+  - master
+pr:
+  - master
+jobs:
+  - job: Platform_CI
+    variables:
+      package: 'EmulatorPkg'
+      vm_image: 'ubuntu-latest'
+      should_run: false
+      run_flags: "MAKE_STARTUP_NSH=TRUE"
+
+    #Use matrix to speed up the build process
+    strategy:
+        matrix:
+          EmulatorPkg_X64_DEBUG:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "X64"
+            Build.Flags: ""
+            Build.Target: "DEBUG"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_X64_RELEASE:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "X64"
+            Build.Flags: ""
+            Build.Target: "RELEASE"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_X64_NOOPT:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "X64"
+            Build.Flags: ""
+            Build.Target: "NOOPT"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_IA32_DEBUG:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "IA32"
+            Build.Flags: ""
+            Build.Target: "DEBUG"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_IA32_RELEASE:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "IA32"
+            Build.Flags: ""
+            Build.Target: "RELEASE"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_IA32_NOOPT:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "IA32"
+            Build.Flags: ""
+            Build.Target: "NOOPT"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+
+    workspace:
+      clean: all
+
+    pool:
+      vmImage: $(vm_image)
+
+    steps:
+    - template: ../../../.azurepipelines/templates/platform-build-run-steps.yml
+      parameters:
+        tool_chain_tag: GCC5
+        build_pkg: $(package)
+        build_target: $(Build.Target)
+        build_arch: $(Build.Arch)
+        build_file: $(Build.File)
+        build_flags: $(Build.Flags)
+        run_flags: $(Run.Flags)
+        # Add steps to install some IA32 only dependencies
+        extra_install_step:
+        - bash: sudo dpkg --add-architecture i386
+          displayName: Add i386 to dpkg
+          condition: and(gt(variables.pkg_count, 0), eq(variables['Build.Arch'], 'IA32'), succeeded())
+        - bash: sudo apt-get update
+          displayName: do apt-get update
+          condition: and(gt(variables.pkg_count, 0), eq(variables['Build.Arch'], 'IA32'), succeeded())
+        - bash: sudo apt-get install libc6-dev:i386 libx11-dev:i386 libxext-dev:i386 lib32gcc-7-dev
+          displayName: Add additional i386 packages
+          condition: and(gt(variables.pkg_count, 0), eq(variables['Build.Arch'], 'IA32'), succeeded())
diff --git a/EmulatorPkg/PlatformCI/.azurepipelines/Windows-VS2019.yml b/EmulatorPkg/PlatformCI/.azurepipelines/Windows-VS2019.yml
new file mode 100644
index 000000000000..a5baf4b6064b
--- /dev/null
+++ b/EmulatorPkg/PlatformCI/.azurepipelines/Windows-VS2019.yml
@@ -0,0 +1,85 @@
+## @file
+# Azure Pipeline build file for building a platform.
+#
+# Platform: EMULATORPKG
+# OS: Windows
+# Toolchain: VS2019
+#
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+trigger:
+  - master
+pr:
+  - master
+
+jobs:
+  - job: Platform_CI
+    variables:
+      package: 'EmulatorPkg'
+      vm_image: 'windows-latest'
+      should_run: true
+      run_flags: "MAKE_STARTUP_NSH=TRUE"
+
+    #Use matrix to speed up the build process
+    strategy:
+        matrix:
+          EmulatorPkg_X64_DEBUG:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "X64"
+            Build.Flags: ""
+            Build.Target: "DEBUG"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_X64_RELEASE:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "X64"
+            Build.Flags: ""
+            Build.Target: "RELEASE"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_X64_NOOPT:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "X64"
+            Build.Flags: ""
+            Build.Target: "NOOPT"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_IA32_DEBUG:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "IA32 "
+            Build.Flags: ""
+            Build.Target: "DEBUG"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_IA32_RELEASE:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "IA32 "
+            Build.Flags: ""
+            Build.Target: "RELEASE"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+          EmulatorPkg_IA32_NOOPT:
+            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
+            Build.Arch: "IA32 "
+            Build.Flags: ""
+            Build.Target: "NOOPT"
+            Run.Flags: $(run_flags)
+            Run: $(should_run)
+
+    workspace:
+      clean: all
+
+    pool:
+      vmImage: $(vm_image)
+
+    steps:
+    - template: ../../../.azurepipelines/templates/platform-build-run-steps.yml
+      parameters:
+        tool_chain_tag: VS2019
+        build_pkg: $(package)
+        build_target: $(Build.Target)
+        build_arch: $(Build.Arch)
+        build_file: $(Build.File)
+        build_flags: $(Build.Flags)
+        run_flags: $(Run.Flags)
diff --git a/EmulatorPkg/PlatformCI/PlatformBuild.py b/EmulatorPkg/PlatformCI/PlatformBuild.py
new file mode 100644
index 000000000000..6defbf6ef148
--- /dev/null
+++ b/EmulatorPkg/PlatformCI/PlatformBuild.py
@@ -0,0 +1,272 @@
+# @file
+# Script to Build EmulatorPkg UEFI firmware
+#
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+import os
+import logging
+import io
+
+from edk2toolext.environment import shell_environment
+from edk2toolext.environment.uefi_build import UefiBuilder
+from edk2toolext.invocables.edk2_platform_build import BuildSettingsManager
+from edk2toolext.invocables.edk2_setup import SetupSettingsManager, RequiredSubmodule
+from edk2toolext.invocables.edk2_update import UpdateSettingsManager
+from edk2toolext.invocables.edk2_pr_eval import PrEvalSettingsManager
+from edk2toollib.utility_functions import RunCmd
+from edk2toollib.utility_functions import GetHostInfo
+
+# ####################################################################################### #
+#                                Common Configuration                                     #
+# ####################################################################################### #
+
+
+class CommonPlatform():
+    ''' Common settings for this platform.  Define static data here and use
+        for the different parts of stuart
+    '''
+    PackagesSupported = ("EmulatorPkg",)
+    ArchSupported = ("X64", "IA32")
+    TargetsSupported = ("DEBUG", "RELEASE", "NOOPT")
+    Scopes = ('emulatorpkg', 'edk2-build')
+    WorkspaceRoot = os.path.realpath(os.path.join(
+        os.path.dirname(os.path.abspath(__file__)), "..", ".."))
+
+    # ####################################################################################### #
+    #                         Configuration for Update & Setup                                #
+    # ####################################################################################### #
+
+
+class SettingsManager(UpdateSettingsManager, SetupSettingsManager, PrEvalSettingsManager):
+
+    def GetPackagesSupported(self):
+        ''' return iterable of edk2 packages supported by this build.
+        These should be edk2 workspace relative paths '''
+        return CommonPlatform.PackagesSupported
+
+    def GetArchitecturesSupported(self):
+        ''' return iterable of edk2 architectures supported by this build '''
+        return CommonPlatform.ArchSupported
+
+    def GetTargetsSupported(self):
+        ''' return iterable of edk2 target tags supported by this build '''
+        return CommonPlatform.TargetsSupported
+
+    def GetRequiredSubmodules(self):
+        ''' return iterable containing RequiredSubmodule objects.
+        If no RequiredSubmodules return an empty iterable
+        '''
+        rs = []
+        # intentionally declare this one with recursive false to avoid overhead
+        rs.append(RequiredSubmodule(
+            "CryptoPkg/Library/OpensslLib/openssl", False))
+
+        # To avoid maintenance of this file for every new submodule
+        # lets just parse the .gitmodules and add each if not already in list.
+        # The GetRequiredSubmodules is designed to allow a build to optimize
+        # the desired submodules but it isn't necessary for this repository.
+        result = io.StringIO()
+        ret = RunCmd("git", "config --file .gitmodules --get-regexp path", workingdir=self.GetWorkspaceRoot(), outstream=result)
+        # Cmd output is expected to look like:
+        # submodule.CryptoPkg/Library/OpensslLib/openssl.path CryptoPkg/Library/OpensslLib/openssl
+        # submodule.SoftFloat.path ArmPkg/Library/ArmSoftFloatLib/berkeley-softfloat-3
+        if ret == 0:
+            for line in result.getvalue().splitlines():
+                _, _, path = line.partition(" ")
+                if path is not None:
+                    if path not in [x.path for x in rs]:
+                        rs.append(RequiredSubmodule(path, True)) # add it with recursive since we don't know
+        return rs
+
+    def SetArchitectures(self, list_of_requested_architectures):
+        ''' Confirm the requests architecture list is valid and configure SettingsManager
+        to run only the requested architectures.
+
+        Raise Exception if a list_of_requested_architectures is not supported
+        '''
+        unsupported = set(list_of_requested_architectures) - \
+            set(self.GetArchitecturesSupported())
+        if(len(unsupported) > 0):
+            errorString = (
+                "Unsupported Architecture Requested: " + " ".join(unsupported))
+            logging.critical(errorString)
+            raise Exception(errorString)
+        self.ActualArchitectures = list_of_requested_architectures
+
+    def GetWorkspaceRoot(self):
+        ''' get WorkspacePath '''
+        return CommonPlatform.WorkspaceRoot
+
+    def GetActiveScopes(self):
+        ''' return tuple containing scopes that should be active for this process '''
+        return CommonPlatform.Scopes
+
+    def FilterPackagesToTest(self, changedFilesList: list, potentialPackagesList: list) -> list:
+        ''' Filter other cases that this package should be built
+        based on changed files. This should cover things that can't
+        be detected as dependencies. '''
+        build_these_packages = []
+        possible_packages = potentialPackagesList.copy()
+        for f in changedFilesList:
+            # BaseTools files that might change the build
+            if "BaseTools" in f:
+                if os.path.splitext(f) not in [".txt", ".md"]:
+                    build_these_packages = possible_packages
+                    break
+            # if the azure pipeline platform template file changed
+            if "platform-build-run-steps.yml" in f:
+                build_these_packages = possible_packages
+                break
+        return build_these_packages
+
+    def GetPlatformDscAndConfig(self) -> tuple:
+        ''' If a platform desires to provide its DSC then Policy 4 will evaluate if
+        any of the changes will be built in the dsc.
+
+        The tuple should be (<workspace relative path to dsc file>, <input dictionary of dsc key value pairs>)
+        '''
+        return (os.path.join("EmulatorPkg", "EmulatorPkg.dsc"), {})
+
+    # ####################################################################################### #
+    #                         Actual Configuration for Platform Build                         #
+    # ####################################################################################### #
+
+
+class PlatformBuilder(UefiBuilder, BuildSettingsManager):
+    def __init__(self):
+        UefiBuilder.__init__(self)
+
+    def AddCommandLineOptions(self, parserObj):
+        ''' Add command line options to the argparser '''
+        parserObj.add_argument('-a', "--arch", dest="build_arch", type=str, default="X64",
+                               help="Optional - architecture to build.  IA32 will use IA32 for Pei & Dxe. "
+                               "X64 will use X64 for both PEI and DXE.")
+
+    def RetrieveCommandLineOptions(self, args):
+        '''  Retrieve command line options from the argparser '''
+
+        shell_environment.GetBuildVars().SetValue(
+            "TARGET_ARCH", args.build_arch.upper(), "From CmdLine")
+        shell_environment.GetBuildVars().SetValue(
+            "ACTIVE_PLATFORM", "EmulatorPkg/EmulatorPkg.dsc", "From CmdLine")
+
+    def GetWorkspaceRoot(self):
+        ''' get WorkspacePath '''
+        return CommonPlatform.WorkspaceRoot
+
+    def GetPackagesPath(self):
+        ''' Return a list of workspace relative paths that should be mapped as edk2 PackagesPath '''
+        return ()
+
+    def GetActiveScopes(self):
+        ''' return tuple containing scopes that should be active for this process '''
+        return CommonPlatform.Scopes
+
+    def GetName(self):
+        ''' Get the name of the repo, platform, or product being build '''
+        ''' Used for naming the log file, among others '''
+
+        # check the startup nsh flag and if set then rename the log file.
+        # this helps in CI so we don't overwrite the build log since running
+        # uses the stuart_build command.
+        if(shell_environment.GetBuildVars().GetValue("MAKE_STARTUP_NSH", "FALSE") == "TRUE"):
+            return "EmulatorPkg_With_Run"
+        return "EmulatorPkg"
+
+    def GetLoggingLevel(self, loggerType):
+        ''' Get the logging level for a given type
+        base == lowest logging level supported
+        con  == Screen logging
+        txt  == plain text file logging
+        md   == markdown file logging
+        '''
+        return logging.DEBUG
+
+    def SetPlatformEnv(self):
+        logging.debug("PlatformBuilder SetPlatformEnv")
+        self.env.SetValue("PRODUCT_NAME", "EmulatorPkg", "Platform Hardcoded")
+        self.env.SetValue("TOOL_CHAIN_TAG", "VS2019", "Default Toolchain")
+
+        # Add support for using the correct Platform Headers, tools, and Libs based on emulator architecture
+        # requested to be built when building VS2019 or VS2017
+        if self.env.GetValue("TOOL_CHAIN_TAG") == "VS2019" or self.env.GetValue("TOOL_CHAIN_TAG") == "VS2017":
+            key = self.env.GetValue("TOOL_CHAIN_TAG") + "_HOST"
+            if self.env.GetValue("TARGET_ARCH") == "IA32":
+                shell_environment.ShellEnvironment().set_shell_var(key, "x86")
+            elif self.env.GetValue("TARGET_ARCH") == "X64":
+                shell_environment.ShellEnvironment().set_shell_var(key, "x64")
+
+        # Add support for using the correct Platform Headers, tools, and Libs based on emulator architecture
+        # requested to be built when building on linux.
+        if GetHostInfo().os.upper() == "LINUX":
+            self.ConfigureLinuxDLinkPath()
+
+        if GetHostInfo().os.upper() == "WINDOWS":
+            self.env.SetValue("BLD_*_WIN_HOST_BUILD", "TRUE",
+                              "Trigger Windows host build")
+
+        self.env.SetValue("MAKE_STARTUP_NSH", "FALSE", "Default to false")
+
+        # I don't see what this does but it is in build.sh
+        key = "BLD_*_BUILD_" + self.env.GetValue("TARGET_ARCH")
+        self.env.SetValue(key, "TRUE", "match script in build.sh")
+        return 0
+
+    def PlatformPreBuild(self):
+        return 0
+
+    def PlatformPostBuild(self):
+        return 0
+
+    def FlashRomImage(self):
+        ''' Use the FlashRom Function to run the emulator.  This gives an easy stuart command line to
+        activate the emulator. '''
+
+        OutputPath = os.path.join(self.env.GetValue(
+            "BUILD_OUTPUT_BASE"), self.env.GetValue("TARGET_ARCH"))
+
+        if (self.env.GetValue("MAKE_STARTUP_NSH") == "TRUE"):
+            f = open(os.path.join(OutputPath, "startup.nsh"), "w")
+            f.write("BOOT SUCCESS !!! \n")
+            # add commands here
+            f.write("reset\n")
+            f.close()
+
+        if GetHostInfo().os.upper() == "WINDOWS":
+            cmd = "WinHost.exe"
+        elif GetHostInfo().os.upper() == "LINUX":
+            cmd = "./Host"
+        else:
+            logging.critical("Unsupported Host")
+            return -1
+        return RunCmd(cmd, "", workingdir=OutputPath)
+
+    def ConfigureLinuxDLinkPath(self):
+        '''
+        logic copied from build.sh to setup the correct libraries
+        '''
+        if self.env.GetValue("TARGET_ARCH") == "IA32":
+            LIB_NAMES = ["ld-linux.so.2", "libdl.so.2 crt1.o", "crti.o crtn.o"]
+            LIB_SEARCH_PATHS = ["/usr/lib/i386-linux-gnu",
+                                "/usr/lib32", "/lib32", "/usr/lib", "/lib"]
+        elif self.env.GetValue("TARGET_ARCH") == "X64":
+            LIB_NAMES = ["ld-linux-x86-64.so.2",
+                         "libdl.so.2", "crt1.o", "crti.o", "crtn.o"]
+            LIB_SEARCH_PATHS = ["/usr/lib/x86_64-linux-gnu",
+                                "/usr/lib64", "/lib64", "/usr/lib", "/lib"]
+
+        HOST_DLINK_PATHS = ""
+        for lname in LIB_NAMES:
+            logging.debug(f"Looking for {lname}")
+            for dname in LIB_SEARCH_PATHS:
+                logging.debug(f"In {dname}")
+                if os.path.isfile(os.path.join(dname, lname)):
+                    logging.debug(f"Found {lname} in {dname}")
+                    HOST_DLINK_PATHS += os.path.join(
+                        os.path.join(dname, lname)) + os.pathsep
+                    break
+        HOST_DLINK_PATHS = HOST_DLINK_PATHS.rstrip(os.pathsep)
+        logging.critical(f"Setting HOST_DLINK_PATHS to {HOST_DLINK_PATHS}")
+        shell_environment.ShellEnvironment().set_shell_var(
+            "HOST_DLINK_PATHS", HOST_DLINK_PATHS)
diff --git a/EmulatorPkg/PlatformCI/ReadMe.md b/EmulatorPkg/PlatformCI/ReadMe.md
new file mode 100644
index 000000000000..c51838ec1aa7
--- /dev/null
+++ b/EmulatorPkg/PlatformCI/ReadMe.md
@@ -0,0 +1,128 @@
+# EmulatorPkg - Platform CI
+
+This ReadMe.md describes the Azure DevOps based Platform CI for EmulatorPkg and how
+to use the same Pytools based build infrastructure locally.
+
+## Supported Configuration Details
+
+This solution for building and running EmulatorPkg has only been validated with Windows 10
+with VS2019 and Ubuntu 18.04 with GCC5 toolchain. Two different firmware builds are
+supported and are described below.
+
+| Configuration name      | Architectures      | DSC File         |Additional Flags |
+| :----                   | :-----             | :----            | :----           |
+| IA32                    | IA32               | EmulatorPkg.dsc  | None            |
+| X64                     | X64                | EmulatorPkg.dsc  | None            |
+
+## EDK2 Developer environment
+
+- [Python 3.8.x - Download & Install](https://www.python.org/downloads/)
+- [GIT - Download & Install](https://git-scm.com/download/)
+- [Edk2 Source](https://github.com/tianocore/edk2)
+- For building Basetools and other host applications
+
+  ``` bash
+  sudo apt-get update
+  sudo apt-get install gcc g++ make uuid-dev
+  ```
+
+- For building ARCH IA32 on X64 Ubuntu 18.04 LTS these steps where needed.
+
+  ``` bash
+  sudo dpkg --add-architecture i386
+  sudo apt-get update
+  sudo apt-get install libc6-dev:i386 libx11-dev:i386 libxext-dev:i386 lib32gcc-7-dev
+  ```
+
+Note: edksetup, Submodule initialization and manual installation of NASM, iASL, or
+the required cross-compiler toolchains are **not** required, this is handled by the
+Pytools build system.
+
+## Building with Pytools for EmulatorPkg
+
+1. [Optional] Create a Python Virtual Environment - generally once per workspace
+
+    ``` bash
+    python -m venv <name of virtual environment>
+    ```
+
+2. [Optional] Activate Virtual Environment - each time new shell opened
+    - Linux
+
+      ```bash
+      source <name of virtual environment>/bin/activate
+      ```
+
+    - Windows
+
+      ``` bash
+      <name of virtual environment>/Scripts/activate.bat
+      ```
+
+3. Install Pytools - generally once per virtual env or whenever pip-requirements.txt changes
+
+    ``` bash
+    pip install --upgrade -r pip-requirements.txt
+    ```
+
+4. Initialize & Update Submodules - only when submodules updated
+
+    ``` bash
+    stuart_setup -c EmulatorPkg/PlatformCI/PlatformBuild.py TOOL_CHAIN_TAG=<TOOL_CHAIN_TAG> -a <TARGET_ARCH>
+    ```
+
+5. Initialize & Update Dependencies - only as needed when ext_deps change
+
+    ``` bash
+    stuart_update -c EmulatorPkg/PlatformCI/PlatformBuild.py TOOL_CHAIN_TAG=<TOOL_CHAIN_TAG> -a <TARGET_ARCH>
+    ```
+
+6. Compile the basetools if necessary - only when basetools C source files change
+
+    ``` bash
+    python BaseTools/Edk2ToolsBuild.py -t <ToolChainTag>
+    ```
+
+7. Compile Firmware
+
+    ``` bash
+    stuart_build -c EmulatorPkg/PlatformCI/PlatformBuild.py TOOL_CHAIN_TAG=<TOOL_CHAIN_TAG> -a <TARGET_ARCH>
+    ```
+
+    - use `stuart_build -c EmulatorPkg/PlatformCI/PlatformBuild.py -h` option to see additional
+    options like `--clean`
+
+8. Running Emulator
+    - You can add `--FlashRom` to the end of your build command and the emulator will run after the
+    build is complete.
+    - or use the `--FlashOnly` feature to just run the emulator.
+
+      ``` bash
+      stuart_build -c EmulatorPkg/PlatformCI/PlatformBuild.py TOOL_CHAIN_TAG=<TOOL_CHAIN_TAG> -a <TARGET_ARCH> --FlashOnly
+      ```
+
+### Notes
+
+1. Configuring *ACTIVE_PLATFORM* and *TARGET_ARCH* in Conf/target.txt is **not** required. This
+   environment is set by PlatformBuild.py based upon the `[-a <TARGET_ARCH>]` parameter.
+
+**NOTE:** Logging the execution output will be in the normal stuart log as well as to your console.
+
+### Custom Build Options
+
+**MAKE_STARTUP_NSH=TRUE** will output a *startup.nsh* file to the location mapped as fs0. This is
+used in CI in combination with the `--FlashOnly` feature to run the Emulator to the UEFI shell and then execute
+the contents of *startup.nsh*.
+
+### Passing Build Defines
+
+To pass build defines through _stuart_build_, prepend `BLD_*_`to the define name and pass it on the
+command-line. _stuart_build_ currently requires values to be assigned, so add an`=1` suffix for bare defines.
+For example, to enable the IP6 Network Stack, the stuart_build command-line would be:
+
+`stuart_build -c EmulatorPkg/PlatformCI/PlatformBuild.py BLD_*_NETWORK_IP6_ENABLE=1`
+
+## References
+
+- [Installing and using Pytools](https://github.com/tianocore/edk2-pytool-extensions/blob/master/docs/using.md#installing)
+- More on [python virtual environments](https://docs.python.org/3/library/venv.html)
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