1 files changed, 27 insertions, 0 deletions
diff --git a/lib/tasks/submodules.rake b/lib/tasks/submodules.rake
new file mode 100644
index 000000000..6da0ff4b8
--- /dev/null
+++ b/lib/tasks/submodules.rake
@@ -0,0 +1,27 @@
+
+namespace :submodules do
+
+    desc "Check the status of the project's submodules"
+    task :check => :environment do
+        commit_info = `git submodule status`
+        sha, repo, branch = commit_info.split(' ')
+        case sha[0]
+        when '+'
+            $stderr.puts "Warning: Currently checked out submodule commit for #{repo}"
+            $stderr.puts "does not match the commit expected by this version of Alaveteli."
+            $stderr.puts "You can update it with 'git submodule update'."
+            exit(1)
+        when '-'
+            $stderr.puts "Warning: Submodule #{repo} needs to be initialized."
+            $stderr.puts "You can do this by running 'git submodule update --init'."
+            exit(1)
+        when 'U'
+            $stderr.puts "Warning: Submodule #{repo} has merge conflicts."
+            $stderr.puts "You'll probably need to resolve these to run Alaveteli."
+            exit(1)
+        else
+            exit(0)
+        end
+    end
+
+end