Fix: Process includes before extends for proper attribute inheritance#853
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glours merged 2 commits intocompose-spec:mainfrom Apr 1, 2026
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Fixes issue where services using 'extends' don't inherit environment variables from the base service when that base service gets attributes from an 'include' directive. The bug occurred because 'extends' was processed before 'includes', meaning extended services couldn't access attributes that came from included files. By processing includes first, we ensure all service attributes are fully merged before extends resolution happens, allowing proper inheritance across include+extends combinations. Signed-off-by: infraanchor <olaitanfalolu02@gmail.com>
ndeloof
approved these changes
Mar 6, 2026
glours
approved these changes
Apr 1, 2026
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Relates to docker/compose#13606
Services using 'extends' don't inherit environment variables from the base service when that base service gets attributes from an 'include' directive.
Root Cause:
'extends' was processed before 'includes', meaning extended services couldn't access attributes that came from included files.
Solution:
Process includes first, ensuring all service attributes are fully merged before extends resolution happens.
Testing:
Regression test added in docker/compose to verify environment variable inheritance across include+extends combinations.