Docker Compose v2.29.7 'unexpected character "-" in variable name' when passing .env

[daraccrafter]

When passing .env file (in which a variable name contains '-') to the " env_file:" (in compose.yml) the above error occurs. This works normally on v2.24.5

[jhrotko]

@daraccrafter could you give more details on how to reproduce your issue? Such as a compose.yml and how you ran the command?

[426Mopar]

I'm having the same problem. The problem is with the .env definitions.
I have names defined with the "-" hyphen, which worked before, but if I'm not mistaken not allowed in bash.

.env example:

...
APPLICATION-FOO-KEY=123456789
...

when I changed it from APPLICATION-FOO-KEY to APPLICATION_FOO_KEY docker compose worked, of course my application doesn't work anymore, since it expects APPLICATION-FOO-KEY but that is another problem.

[jhrotko]

@426Mopar @daraccrafter this issue has been addressed in #12123. In the next release this should be fixed! I will close this issue has duplicated