agent: log injected version string at startup

[Utkarsh9571]

This patch adds a startup log line to the Woodpecker agent that prints the injected version string.

• Uses -ldflags to inject Version at build time
• Logs the version using zerolog in main.go
• Helps validate build provenance and patch testing
• Safe to merge; does not affect agent registration or backend handshake

Example output:
{"level":"info","message":"Woodpecker Agent Version: localtest"}

This supports contributor validation for Issue #5685.

[Utkarsh9571]

Hi team! Just checking in on this patch — it adds a startup log line to the agent that prints the injected version string, helping validate build provenance and patch testing.

• Scope: agent only
• No impact on registration or backend handshake
• Fully contributor-safe and reproducible

Would appreciate a quick review or workflow approval when possible. Thanks for your time!

[qwerty287]

Thanks, but this doesn't look right. The version is stored at version/version.go.

[Utkarsh9571]

@qwerty287 Thanks for the feedback! I've updated the patch to use version.String() from version/version.go for logging the agent version, as suggested. The custom Version variable and -ldflags logic have been removed for consistency.

Let me know if you'd like any further changes!

[qwerty287]

Thanks, please revert any change that is not related.

• Restore the docker example
• remove the version.go file
• use tabs instead of spaces.

Checkout the diff to see how your change currently looks like, then you'll see what's wrong.

Also, I'd put the log statement into cmd/agent/core/agent.go.

[Utkarsh9571]

@qwerty287 Thanks for the detailed feedback! I think i've made the required changes:

• Moved the version log to cmd/agent/core/agent.go as requested
• Removed version/version.go
• Restored docker-compose.example.yaml
• Reverted unrelated changes and ensured tab-based formatting with gofmt

Let me know if anything else needs adjustment!

[6543]

that was the wrong version.go i would say

now server and cli have no way of knowing what version they are 😅

[Utkarsh9571]

@6543 yeah, thanks for pointing that out man. I misunderstood the version.go context — happy to restore version reporting properly. Would you prefer I reintroduce the version string via ldflags and wire it into the CLI output for both agent and server? I can patch that cleanly.

[6543]

it's already done so via our build chain just use it, doesnt have to be as complex ;)

[6543]

woodpecker/Makefile

Line 40 in 1432037

LDFLAGS := -X go.woodpecker-ci.org/woodpecker/v3/version.Version=${VERSION}

[Utkarsh9571]

yeah, do you need me to do something else in this? i'm kinda new to open source, so don't know much how all that works.

[qwerty287]

Just reverting all the changes except cmd/agent/core/agent.go should do it.

[Utkarsh9571]

@qwerty287 i made a commit, is it good now?

[qwerty287]

Sorry, but no.

All the files in the diff (you can see that in the files tab) except cmd/agent/core/agent.go have to have the same content as in main. So this file must be the only one that's shown there.

[Utkarsh9571]

@qwerty287 bro, this branch is messed up, i created another branch and opened another pr #5724

so check that out