Merge pull request #243 from aminya/git-clone-shallow

src/Git.cmake

@@ -12,11 +12,19 @@ Input variables:
 - ``REPOSITORY_PATH``: The path to the repository
 - ``REMOTE_URL``: The url of the remote to add
 - ``REMOTE_NAME``: The name of the remote to add (defaults to the remote user)
+- ``SHALLOW_SINCE``: Create a shallow clone with a history after the specified time. date should be in format of `git log --date=raw`.
+- ``BRANCH``: Only clone the given branch
 - ``FORCE_CLONE``: Force the clone even if the directory exists
-
 ]]
 function(git_clone)
-  set(oneValueArgs REPOSITORY_PATH REMOTE_URL REMOTE_NAME FORCE_CLONE)
+  set(oneValueArgs
+      REPOSITORY_PATH
+      REMOTE_URL
+      REMOTE_NAME
+      SHALLOW_SINCE
+      BRANCH
+      FORCE_CLONE
+  )
   cmake_parse_arguments(_fun "" "${oneValueArgs}" "" ${ARGN})
 
   if("${_fun_REPOSITORY_PATH}" STREQUAL "" OR "${_fun_REMOTE_URL}" STREQUAL "")
@@ -29,14 +37,23 @@ function(git_clone)
 
     find_program(GIT_EXECUTABLE "git" REQUIRED)
     get_filename_component(_fun_REPOSITORY_PARENT_PATH "${_fun_REPOSITORY_PATH}" DIRECTORY)
+
+    set(GIT_ARGS "clone" "${_fun_REMOTE_URL}" "${_fun_REPOSITORY_PATH}")
+
+    if(NOT "${_fun_SHALLOW_SINCE}" STREQUAL "")
+      list(APPEND GIT_ARGS "--shallow-since=${_fun_SHALLOW_SINCE}")
+    endif()
+
+    if(NOT "${_fun_BRANCH}" STREQUAL "")
+      list(APPEND GIT_ARGS "--single-branch" "--branch=${_fun_BRANCH}")
+    endif()
+
     execute_process(
-      COMMAND "${GIT_EXECUTABLE}" "clone" "${_fun_REMOTE_URL}"
-      WORKING_DIRECTORY "${_fun_REPOSITORY_PARENT_PATH}" COMMAND_ERROR_IS_FATAL LAST
+      COMMAND "${GIT_EXECUTABLE}" ${GIT_ARGS} WORKING_DIRECTORY "${_fun_REPOSITORY_PARENT_PATH}"
+                                                                COMMAND_ERROR_IS_FATAL LAST
     )
   else()
-    message(
-      STATUS "Repository already exists at ${_fun_REPOSITORY_PATH}. Waiting for git lock file.."
-    )
+    message(STATUS "Repository already exists at ${_fun_REPOSITORY_PATH}.")
     git_wait(REPOSITORY_PATH "${_fun_REPOSITORY_PATH}")
 
     if(NOT EXISTS "${_fun_REPOSITORY_PATH}/.git")
@@ -389,6 +406,8 @@ function(git_wait)
 
   set(counter 0)
 
+  message(STATUS "Waiting for git lock file...[${counter}/${_fun_TIMEOUT_COUNTER}]")
+
   # wait until .git/index is present (in case a parallel clone is running)
   while(NOT EXISTS "${_fun_REPOSITORY_PATH}/.git/index"
         OR EXISTS "${_fun_REPOSITORY_PATH}/.git/index.lock"