Puppet：找到1个依赖循环

Error: Could not apply complete catalog: Found 1 dependency cycle:
(Exec[pip install requirements] => File[change venv permissions] => File[enforce MinGW compiler] => Exec[pip install requirements])
Try the '--graph' option and opening the resulting '.dot' file in OmniGraffle or GraphViz

这是我的Puppet清单(相关部分),我没有看到任何依赖循环.有任何想法吗？

exec {'create virtualenv':
    command => "$install_dir/Scripts/virtualenv.exe venv",cwd     => $project_dir,require => Exec['install virtualenv'],}

file { "fix Mingw32CCompiler":
    path    => "C:/Python27/Lib/distutils/cygwinccompiler.py",content => template($cygwinc_template),ensure  => present,require => Exec['create virtualenv'],}

file { "enforce MinGW compiler":
    path    => "$project_dir/venv/Lib/distutils/distutils.cfg",owner   => $user,content => $mingw,require => File['fix Mingw32CCompiler'],}

exec {'pip install requirements':
    timeout => 1200,command => "$project_dir/venv/Scripts/pip.exe install -r $project_dir/requirements.txt",require => File['enforce MinGW compiler'],}

file {'change venv permissions':
    path    => "$project_dir/venv",recurse => true,mode    => 0770,require => Exec['pip install requirements'],}