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Implement environment variable interpolation to YAML dictionary keys

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`podman-compose` currently does not support interpolating environment
variables in dictionary keys, despite the compose file specification
indicating this capability.
See the relevant compose-spec documentation:
https://github.com/compose-spec/compose-spec/blob/main/12-interpolation.md

This feature is useful in `labels` or `environment` sections, where keys
can be user-defined strings. To enable interpolation, an alternate equal
sign syntax must be used, e.g.:
services:
  foo:
    labels:
      - "$VAR_NAME=label_value"

After this PR `podman-compose` will align more closely with the compose
file specification, allowing for the interpolation of environment
variables in dictionary keys.

Signed-off-by: Monika Kairaityte <monika@kibit.lt>
This commit is contained in:
Monika Kairaityte
2025-06-30 23:36:42 +03:00
parent 9fe6e7f284
commit e97d446a04
6 changed files with 53 additions and 1 deletions
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2
podman_compose.py
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@@ -290,7 +290,7 @@ def rec_subs(value: dict | str | Iterable, subs_dict: dict[str, Any]) -> dict |
svc_envs = rec_subs(svc_envs, subs_dict)
subs_dict.update(svc_envs)
value = {k: rec_subs(v, subs_dict) for k, v in value.items()}
value = {rec_subs(k, subs_dict): rec_subs(v, subs_dict) for k, v in value.items()}
elif isinstance(value, str):
def convert(m: re.Match) -> str: