Merge pull request #4933 from CocoaPods/mr-propagate-version-to-prepare_command

Propagate the CocoaPods version to the prepare_command

CHANGELOG.md

@@ -16,6 +16,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Marius Rackwitz](https://github.com/mrackwitz)
   [#4146](https://github.com/CocoaPods/CocoaPods/pull/4146)
 
+* Pass `COCOAPODS_VERSION` as environment variable to the `prepare_command`.  
+  [Marius Rackwitz](https://github.com/mrackwitz)
+  [#4933](https://github.com/CocoaPods/CocoaPods/pull/4933)
+
 ##### Bug Fixes
 
 * Pods are built by default in another scoping level of the build products

lib/cocoapods/executable.rb

@@ -30,7 +30,7 @@ module Pod
 
     # Executes the given command displaying it if in verbose mode.
     #
-    # @param  [String] bin
+    # @param  [String] executable
     #         The binary to use.
     #
     # @param  [Array<#to_s>] command

lib/cocoapods/installer/pod_source_preparer.rb

@@ -58,10 +58,15 @@ module Pod
         return unless spec.prepare_command
         UI.section(' > Running prepare command', '', 1) do
           Dir.chdir(path) do
-            ENV.delete('CDPATH')
-            prepare_command = spec.prepare_command.strip_heredoc.chomp
-            full_command = "\nset -e\n" + prepare_command
-            bash!('-c', full_command)
+            begin
+              ENV.delete('CDPATH')
+              ENV['COCOAPODS_VERSION'] = Pod::VERSION
+              prepare_command = spec.prepare_command.strip_heredoc.chomp
+              full_command = "\nset -e\n" + prepare_command
+              bash!('-c', full_command)
+            ensure
+              ENV.delete('COCOAPODS_VERSION')
+            end
           end
         end
       end

spec/unit/installer/pod_source_installer_spec.rb

@@ -58,6 +58,18 @@ module Pod
           @spec.prepare_command = 'cd Classes;ls Banana.h'
           lambda { @installer.install! }.should.not.raise
         end
+
+        it 'sets the $COCOAPODS_VERSION environment variable' do
+          @spec.prepare_command = "[ \"$COCOAPODS_VERSION\" == \"#{Pod::VERSION}\" ] || exit 1"
+          lambda { @installer.install! }.should.not.raise
+        end
+
+        it 'doesn\'t leak the $COCOAPODS_VERSION environment variable' do
+          ENV['COCOAPODS_VERSION'] = nil
+          @spec.prepare_command = 'exit 1'
+          lambda { @installer.install! }.should.raise(Pod::Informative)
+          ENV['COCOAPODS_VERSION'].should.be.nil
+        end
       end
 
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