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allow '.' (dot) in environment variable name #271

merged 1 commit into from Jun 22, 2022


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@glours glours commented Jun 2, 2022

@glours glours requested a review from ulyssessouza Jun 2, 2022
@glours glours self-assigned this Jun 2, 2022
@glours glours requested a review from ndeloof as a code owner Jun 2, 2022
milas approved these changes Jun 7, 2022
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@milas milas left a comment

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Logic LGTM for the compat fix!

Thoughts on larger impact around Compose spec:

My understanding is that there's 2 accepted "specs" for environment variable names out there:

  • IEEE Std 1003.1-2001 - any printable character but = and NUL is valid
  • Most shells - alphanumeric + _, must start with letter -> [a-zA-Z_][a-zA-Z0-9_]*

Given that v1 allowed ., I'm guessing for the Compose spec, we want to formalize supporting the more flexible option, at which point, we should revisit the impl here to match since right now this is somewhere in the middle -- it's almost the shell rules but we don't require first char to be a letter and now we'll allow .

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Signed-off-by: Guillaume Lours <>
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Successfully merging this pull request may close these issues.

Docker-compose doesn't accept environment variables with dot symbol (".")
3 participants