Added a warning if you're using an old version of git.

technicalpickles · technicalpickles · commit ddc5b77c8fd2 · 2009-08-01T18:17:30.000-04:00
diff --git a/lib/git.rb b/lib/git.rb
@@ -26,6 +26,14 @@
 require 'git/stashes'
 require 'git/stash'
 
+minimum_version = [1, 6, 0, 0]
+current_version = Git::Lib.new(nil, nil).command_version
+if current_version[0] < minimum_version[0] || 
+   current_version[1] < minimum_version[1] ||
+   current_version[2] < minimum_version[2] ||
+   current_version[3] < minimum_version[3]
+  $stderr.puts "The git gem requires git #{minimum_version.join('.')} or later, but only found #{current_version.join('.')}. You should probably upgrad.e"
+end
 
 # Git/Ruby Library
 #
diff --git a/lib/git/lib.rb b/lib/git/lib.rb
@@ -643,7 +643,14 @@ def archive(sha, file = nil, opts = {})
       command('archive', arr_opts, true, (opts[:add_gzip] ? '| gzip' : '') + " > #{escape file}")
       return file
     end
-    
+
+    # returns the current version of git, as an Array of Fixnums.
+    def command_version
+      output = command('version', [], false)
+      version = output[/(\d+)\.(\d+)\.(\d+)\.(\d+)/]
+      version.split('.').collect {|i| i.to_i}
+    end
+
     private
     
     def command_lines(cmd, opts = [], chdir = true, redirect = '')
