Making the switch to v2

samples/roles/common/tasks/main.yml

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+- debug: msg="this is a task from the common role"

samples/roles/role_a/meta/main.yml

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+dependencies:
+- common

samples/roles/role_a/tasks/main.yml

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+- debug: msg="this is a task from role A"

samples/roles/role_b/meta/main.yml

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+dependencies:
+- common

samples/roles/role_b/tasks/main.yml

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+- debug: msg="this is a task from role B"

samples/roles/test_become_r1/meta/main.yml

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+allow_duplicates: yes

samples/roles/test_become_r1/tasks/main.yml

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+- command: whoami

samples/roles/test_become_r2/meta/main.yml

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+allow_duplicates: yes
+dependencies:
+  - test_become_r1

samples/roles/test_become_r2/tasks/main.yml

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+- command: whoami

samples/roles/test_role/meta/main.yml

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+dependencies:
+  - test_role_dep

samples/roles/test_role/tasks/main.yml

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+- debug: msg="here we are in the role, foo={{foo}}"
+- fail:
+  when: foo != "bar"

samples/roles/test_role_dep/tasks/main.yml

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+- debug: msg="here we are in the role dependency"