mark explicitly published port as string to avoid user confusion

[glours]

Signed-off-by: Guillaume Lours [email protected]

Proposed changes

As string can be unquoted in Yaml, our example may confused user and let them assume that the ports.published attribut can be an integer.

I explicitly wrapped the value with quotes to remove ambiguity

Related issues (optional)

https://github.com/docker/compose/issues/9306

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[thaJeztah]

Did that change? Because it definitely was an integer before; if integers are no longer accepted that is a big breaking change; https://github.com/docker/cli/blob/master/cli/compose/schema/data/config_schema_v3.9.json#L226

[jsoriano]

Did that change?

It changed in docker compose 2.3.0, see https://github.com/docker/compose/issues/9306.

[glours]

@thaJeztah introduced in compose-go with this PR, new versions of Compose can handle both, the issue comes when an older than v2.3.0 version of Compose try to parse the ports.published port as an integer when it's a string (and docker compose config generate a string by default since version v2.3.0) So no issue with the CLI, Compose handle that properly

[thaJeztah]

and docker compose config generate a string by default since version v2.3.0)

could config produce an integer (without quotes) if it's only a number (and only fall-back to using a string if it was actually a port range?)

[milas]

I'm not totally sure that changing this example will help ease confusion.

I think we should:

• Clarify in the Compose spec that published can be of type number | string with explanation of port ranges
  • For parsing, implementations MUST support string for both ranges and single ports and MUST support number for single ports
  • For serializing, can be implementation dependent (e.g. always stringifying the published port is acceptable)
• Update compose-go to use number when single port, and string when range (as suggested by @thaJeztah above)
  • Although current behavior (always stringify) would be compliant based on my spec suggestion, it's causing headache today and is less user-friendly IMO, we should strive for our implementation to go above the bare minimum

I think it's clear from the linked issue that, ignoring compatibility issues, users find the "single port as a string in published while single port as a number in target" behavior undesirable, and given that docker/compose already supports both on input and the spec is vague, aligning things around the least surprising behavior makes the most sense here IMO