add doc

README.md

@@ -11,6 +11,132 @@ pip3 install boto3 python-terraform --user
 export PATH=$PATH:~/.local/bin
 ```
 
+# Example Build
+lets assume the following poject structure
+
+```
+my-project
+   | -> my-module
+   |       | -> build.py
+   |       | -> some-terraform.tf
+   | -> an-other-module
+   | -> target  (here will the build happen)
+   |       | -> ...
+```
+
+```
+from pybuilder.core import task, init
+from ddadevops import *
+
+name = 'my-project'
+MODULE = 'my-module'
+PROJECT_ROOT_PATH = '..'
+
+class MyBuild(DevopsTerraformBuild):
+    pass
+
+
+@init
+def initialize(project):
+    project.build_depends_on('ddadevops>=0.5.0')
+    account_name = 'my-aws-account-name'
+    account_id = 'my-aws-account-id'
+    stage = 'my stage i.e. dev|test|prod'
+    additional_vars = {'var_to_use_insied_terraform': '...'}
+    additional_var_files = ['variable-' + account_name + '-' + stage + '.tfvars']
+    config = create_devops_terraform_build_config(stage, PROJECT_ROOT_PATH,
+                                                  MODULE, additional_vars,
+                                                  additional_tfvar_files=additional_var_files)
+    build = MyBuild(project, config)
+    build.initialize_build_dir()
+
+
+@task
+def plan(project):
+    build = get_devops_build(project)
+    build.plan()
+
+
+@task
+def apply(project):
+    build = get_devops_build(project)
+    build.apply()
+
+@task
+def destroy(project):
+    build = get_devops_build(project)
+    build.destroy()
+
+@task
+def tf_import(project):
+    build = get_devops_build(project)
+    build.tf_import('aws_resource.choosen_name', 'the_aws_id')
+```
+
+## Feature aws-backend
+Will use a file `backend.dev.live.properties` where dev is the [account-name], live is the  [stage].
+
+the backend.dev.live.properties file content:
+```
+key = ".."
+region = "the aws region"
+profile = "the profile used for aws"
+bucket = "the s3 bucket name"
+kms_key_id = "the aws key id"
+```
+
+the build.py file content:
+```
+class MyBuild(AwsBackendPropertiesMixin, DevopsTerraformBuild):
+    pass
+
+
+@init
+def initialize(project):
+    project.build_depends_on('ddadevops>=0.5.0')
+    account_name = 'my-aws-account-name'
+    account_id = 'my-aws-account-id'
+    stage = 'my stage i.e. dev|test|prod'
+    additional_vars = {}
+    config = create_devops_terraform_build_config(stage, PROJECT_ROOT_PATH,
+                                                  MODULE, additional_vars)
+    config = add_aws_backend_properties_mixin_config(config, account_name)
+    build = MyBuild(project, config)
+    build.initialize_build_dir()
+```
+
+## Feature aws-mfa-assume-role
+In order to use aws assume role in combination with the mfa-tool (`pip install mfa`):
+
+the build.py file content:
+```
+class MyBuild(class MyBuild(AwsMfaMixin, DevopsTerraformBuild):
+    pass
+
+
+@init
+def initialize(project):
+    project.build_depends_on('ddadevops>=0.5.0')
+    account_name = 'my-aws-account-name'
+    account_id = 'my-aws-account-id'
+    stage = 'my stage i.e. dev|test|prod'
+    additional_vars = {}
+    config = create_devops_terraform_build_config(stage, PROJECT_ROOT_PATH,
+                                                  MODULE, additional_vars)
+    config = add_aws_backend_properties_mixin_config(config, account_name)
+    config = add_aws_mfa_mixin_config(config, account_id, 'eu-central-1',
+                                      mfa_role='my_developer_role',
+                                      mfa_account_prefix='company-',
+                                      mfa_login_account_suffix='users_are_defined_here')
+    build = MyBuild(project, config)
+    build.initialize_build_dir()
+
+@task
+def access(project):
+    build = get_devops_build(project)
+    build.get_mfa_session()
+```
+
 # Snapshot
 1. pyb publish upload
 2. Versions nr in build.py: hochzählen, *.dev0 anfügen