ENH: Use a TryCheckout technique to decide whether or not to attempt building the projects that depend on a cvs or svn download method.

1 files changed, 54 insertions, 0 deletions

diff --git a/Tests/ExternalProject/TryCheckout.cmake b/Tests/ExternalProject/TryCheckout.cmake
new file mode 100644
index 0000000..de069eb
--- /dev/null
+++ b/Tests/ExternalProject/TryCheckout.cmake
@@ -0,0 +1,54 @@
+find_package(CVS)
+find_package(Subversion)
+
+
+function(try_cvs_checkout repository module dir result_var)
+  # Assume cvs checkouts will not work:
+  set(${result_var} 0 PARENT_SCOPE)
+
+  if(CVS_EXECUTABLE)
+    message(STATUS "try_cvs_checkout")
+
+    # Ensure directory exists so we can call cvs in it:
+    file(MAKE_DIRECTORY "${dir}")
+
+    # Try to do the cvs checkout command:
+    execute_process(COMMAND ${CVS_EXECUTABLE} -d ${repository} co ${module}
+      WORKING_DIRECTORY ${dir}
+      TIMEOUT 30
+      RESULT_VARIABLE rv)
+
+    # If it worked, cvs checkouts will work:
+    if(rv EQUAL 0)
+      set(${result_var} 1 PARENT_SCOPE)
+    endif()
+
+    message(STATUS "try_cvs_checkout -- done")
+  endif()
+endfunction(try_cvs_checkout)
+
+
+function(try_svn_checkout repository dir result_var)
+  # Assume svn checkouts will not work:
+  set(${result_var} 0 PARENT_SCOPE)
+
+  if(Subversion_SVN_EXECUTABLE)
+    message(STATUS "try_svn_checkout")
+
+    # Ensure directory exists so we can call svn in it:
+    file(MAKE_DIRECTORY "${dir}")
+
+    # Try to do the svn checkout command:
+    execute_process(COMMAND ${Subversion_SVN_EXECUTABLE} co ${repository} ${dir}
+      WORKING_DIRECTORY ${dir}
+      TIMEOUT 30
+      RESULT_VARIABLE rv)
+
+    # If it worked, svn checkouts will work:
+    if(rv EQUAL 0)
+      set(${result_var} 1 PARENT_SCOPE)
+    endif()
+
+    message(STATUS "try_svn_checkout -- done")
+  endif()
+endfunction(try_svn_checkout)