Support variable interpolation in service env_file files - #1510
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Before service-level `env_file` files did not interpolate variables from
the project's `.env` file (or `--env-file`). Now `${VAR}` syntax works
in service `env_file` files, with compose-level variables available for
interpolation. This aligns `podman-compose` behavior with Docker
Compose.
Signed-off-by: Monika Kairaityte <monika@kibit.lt>
This commit extends interpolation support to also recognize the bare
`$VAR` syntax (without braces), which docker-compose accepts.
A preprocessing step rewrites bare `$VAR` into `${VAR}` before
python-dotenv parses the file, so the existing interpolation logic works
for both syntaxes. Escaped `$$VAR` is preserved as a literal `$VAR`,
and single-quoted values are left untouched.
Signed-off-by: Monika Kairaityte <monika@kibit.lt>
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Before service-level
env_filefiles did not interpolate variables from the project's.envfile (or--env-file), and the$VARsyntax (without braces) was completely unsupported.Now both
${VAR}and$VARsyntaxes work in serviceenv_filefiles, with compose-level variables available for interpolation. This alignspodman-composebehavior with Docker Compose.Fixes #848.