Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/cmake/GetGitRevisionDescription.cmake

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+# - Returns a version string from Git
+#
+# These functions force a re-configure on each git commit so that you can
+# trust the values of the variables in your build system.
+#
+#  get_git_head_revision(<refspecvar> <hashvar> [<additional arguments to git describe> ...])
+#
+# Returns the refspec and sha hash of the current head revision
+#
+#  git_describe(<var> [<additional arguments to git describe> ...])
+#
+# Returns the results of git describe on the source tree, and adjusting
+# the output so that it tests false if an error occurs.
+#
+#  git_get_exact_tag(<var> [<additional arguments to git describe> ...])
+#
+# Returns the results of git describe --exact-match on the source tree,
+# and adjusting the output so that it tests false if there was no exact
+# matching tag.
+#
+# Requires CMake 2.6 or newer (uses the 'function' command)
+#
+# Original Author:
+# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
+# http://academic.cleardefinition.com
+# Iowa State University HCI Graduate Program/VRAC
+#
+# Copyright Iowa State University 2009-2010.
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+if(__get_git_revision_description)
+  return()
+endif()
+set(__get_git_revision_description YES)
+
+# We must run the following at "include" time, not at function call time,
+# to find the path to this module rather than the path to a calling list file
+get_filename_component(_gitdescmoddir ${CMAKE_CURRENT_LIST_FILE} PATH)
+
+function(get_git_head_revision _refspecvar _hashvar)
+
+  set(GIT_PARENT_DIR "${PROJECT_SOURCE_DIR}")
+  set(GIT_DIR "${GIT_PARENT_DIR}/.git")
+  while(NOT EXISTS "${GIT_DIR}") # .git dir not found, search parent directories
+    set(GIT_PREVIOUS_PARENT "${GIT_PARENT_DIR}")
+    get_filename_component(GIT_PARENT_DIR ${GIT_PARENT_DIR} PATH)
+    if(GIT_PARENT_DIR STREQUAL GIT_PREVIOUS_PARENT)
+      # We have reached the root directory, we are not in git
+      set(${_refspecvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
+      set(${_hashvar} "GITDIR-NOTFOUND" PARENT_SCOPE)
+      return()
+    endif()
+    set(GIT_DIR "${GIT_PARENT_DIR}/.git")
+  endwhile()
+  set(GIT_DATA "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/git-data")
+  if(NOT EXISTS "${GIT_DATA}")
+    file(MAKE_DIRECTORY "${GIT_DATA}")
+  endif()
+
+  if(NOT EXISTS "${GIT_DIR}/HEAD")
+    return()
+  endif()
+  set(HEAD_FILE "${GIT_DATA}/HEAD")
+  configure_file("${GIT_DIR}/HEAD" "${HEAD_FILE}" COPYONLY)
+
+  configure_file("${_gitdescmoddir}/GetGitRevisionDescription.cmake.in" "${GIT_DATA}/grabRef.cmake" @ONLY)
+  include("${GIT_DATA}/grabRef.cmake")
+
+  set(${_refspecvar} "${HEAD_REF}" PARENT_SCOPE)
+  set(${_hashvar} "${HEAD_HASH}" PARENT_SCOPE)
+endfunction()
+
+function(git_rev_parse _var)
+  if(NOT GIT_FOUND)
+    find_package(Git QUIET)
+  endif()
+  if(NOT GIT_FOUND)
+    set(${_var} "n/a" PARENT_SCOPE)
+    return()
+  endif()
+  get_git_head_revision(refspec hash)
+  if(NOT hash)
+    set(${_var} "n/a" PARENT_SCOPE)
+    return()
+  endif()
+
+  execute_process(
+    COMMAND "${GIT_EXECUTABLE}" rev-parse ${ARGN} ${hash} WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}" RESULT_VARIABLE res
+    OUTPUT_VARIABLE out ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+  if(NOT res EQUAL 0)
+    set(out "n/a")
+  endif()
+
+  set(${_var} "${out}" PARENT_SCOPE)
+endfunction()
+
+function(git_describe _var)
+  if(NOT GIT_FOUND)
+    find_package(Git QUIET)
+  endif()
+  if(NOT GIT_FOUND)
+    set(${_var} "n/a" PARENT_SCOPE)
+    return()
+  endif()
+  get_git_head_revision(refspec hash)
+  if(NOT hash)
+    set(${_var} "n/a" PARENT_SCOPE)
+    return()
+  endif()
+
+  execute_process(
+    COMMAND "${GIT_EXECUTABLE}" describe ${hash} ${ARGN} WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}" RESULT_VARIABLE res
+    OUTPUT_VARIABLE out ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+  if(NOT res EQUAL 0)
+    set(out "n/a")
+  endif()
+
+  set(${_var} "${out}" PARENT_SCOPE)
+endfunction()
+
+function(git_get_exact_tag _var)
+  git_describe(out --exact-match ${ARGN})
+  set(${_var} "${out}" PARENT_SCOPE)
+endfunction()