Versioning improvements (#768)

Co-authored-by: ReenigneArcher <42013603+ReenigneArcher@users.noreply.github.com>

CMakeLists.txt

@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 3.18)
 # `CMAKE_CUDA_ARCHITECTURES` requires 3.18
 
+# todo - set version to 0.0.0 once confident in automated versioning
 project(Sunshine VERSION 0.18.4
         DESCRIPTION "Sunshine is a self-hosted game stream host for Moonlight."
         HOMEPAGE_URL "https://app.lizardbyte.dev")
@@ -10,6 +11,65 @@ and Nvidia GPUs for hardware encoding. Software encoding is also available. You
 Moonlight client on a variety of devices. A web UI is provided to allow configuration, and client pairing, from \
 your favorite web browser. Pair from the local server or any mobile device.")
 
+# Check if env vars are defined before attempting to access them, variables will be defined even if blank
+if((DEFINED ENV{BRANCH}) AND (DEFINED ENV{BUILD_VERSION}) AND (DEFINED ENV{COMMIT}))  # cmake-lint: disable=W0106
+    if(($ENV{BRANCH} STREQUAL "master") AND (NOT $ENV{BUILD_VERSION} STREQUAL ""))
+        # If BRANCH is "master" and BUILD_VERSION is not empty, then we are building a master branch
+        MESSAGE("Got from CI master branch and version $ENV{BUILD_VERSION}")
+        set(PROJECT_VERSION $ENV{BUILD_VERSION})
+    elseif((DEFINED ENV{BRANCH}) AND (DEFINED ENV{COMMIT}))
+        # If BRANCH is set but not BUILD_VERSION we are building nightly, we gather only the commit hash
+        MESSAGE("Got from CI $ENV{BRANCH} branch and commit $ENV{COMMIT}")
+        set(PROJECT_VERSION ${PROJECT_VERSION}.$ENV{COMMIT})
+    endif()
+# Generate Sunshine Version based of the git tag
+# https://github.com/nocnokneo/cmake-git-versioning-example/blob/master/LICENSE
+else()
+    find_package(Git)
+    if(GIT_EXECUTABLE)
+        MESSAGE("${CMAKE_CURRENT_SOURCE_DIR}")
+        get_filename_component(SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR} DIRECTORY)
+        #Get current Branch
+        execute_process(
+            COMMAND ${GIT_EXECUTABLE} rev-parse --abbrev-ref HEAD
+            #WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+            OUTPUT_VARIABLE GIT_DESCRIBE_BRANCH
+            RESULT_VARIABLE GIT_DESCRIBE_ERROR_CODE
+            OUTPUT_STRIP_TRAILING_WHITESPACE
+        )
+        # Gather current commit
+        execute_process(
+            COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
+            #WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+            OUTPUT_VARIABLE GIT_DESCRIBE_VERSION
+            RESULT_VARIABLE GIT_DESCRIBE_ERROR_CODE
+            OUTPUT_STRIP_TRAILING_WHITESPACE
+        )
+        # Check if Dirty
+        execute_process(
+            COMMAND ${GIT_EXECUTABLE} diff --quiet --exit-code
+            #WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+            RESULT_VARIABLE GIT_IS_DIRTY
+            OUTPUT_STRIP_TRAILING_WHITESPACE
+        )
+        if(NOT GIT_DESCRIBE_ERROR_CODE)
+            MESSAGE("Sunshine Branch: ${GIT_DESCRIBE_BRANCH}")
+            if(NOT GIT_DESCRIBE_BRANCH STREQUAL "master")
+                set(PROJECT_VERSION ${PROJECT_VERSION}.${GIT_DESCRIBE_VERSION})
+                MESSAGE("Sunshine Version: ${GIT_DESCRIBE_VERSION}")
+            endif()
+            if(GIT_IS_DIRTY)
+                set(PROJECT_VERSION ${PROJECT_VERSION}.dirty)
+                MESSAGE("Git tree is dirty!")
+            endif()
+        else()
+            MESSAGE(ERROR ": Got git error while fetching tags: ${GIT_DESCRIBE_ERROR_CODE}")
+        endif()
+    else()
+        MESSAGE(WARNING ": Git not found, cannot find git version")
+    endif()
+endif()
+
 option(SUNSHINE_CONFIGURE_APPIMAGE "Configuration specific for AppImage." OFF)
 option(SUNSHINE_CONFIGURE_AUR "Configure files required for AUR." OFF)
 option(SUNSHINE_CONFIGURE_FLATPAK_MAN "Configure manifest file required for Flatpak build." OFF)
@@ -75,7 +135,7 @@ pkg_check_modules(CURL REQUIRED libcurl)
 if(WIN32)
     set(Boost_USE_STATIC_LIBS ON)  # cmake-lint: disable=C0103
     # workaround to prevent link errors against icudata, icui18n
-    set(Boost_NO_BOOST_CMAKE ON) # cmake-lint: disable=C0103
+    set(Boost_NO_BOOST_CMAKE ON)  # cmake-lint: disable=C0103
 endif()
 
 find_package(Boost COMPONENTS locale log filesystem program_options REQUIRED)
@@ -396,7 +456,7 @@ ${CMAKE_BINARY_DIR}/generated-src/${filename}.h")
     configure_file(sunshine.service.in sunshine.service @ONLY)
 endif()
 
-configure_file(version.h.in version.h @ONLY)
+configure_file(src/version.h.in version.h @ONLY)
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 set(SUNSHINE_TARGET_FILES