dco: improve error message

AkihiroSuda · AkihiroSuda · commit 9e6215097676 · 2025-04-12T23:15:07.000+09:00
The former message was unclear to a new contributor who does not know DCO

Signed-off-by: Akihiro Suda &lt;akihiro.suda.cz@hco.ntt.co.jp&gt;
diff --git a/rules/dco/dco.go b/rules/dco/dco.go
@@ -41,7 +41,7 @@ func ValidateDCO(r validate.Rule, c git.CommitEntry) (vr validate.Result) {
 	}
 	if !hasValid {
 		vr.Pass = false
-		vr.Msg = "does not have a valid DCO"
+		vr.Msg = "does not have a valid Developer Certificate of Origin (DCO, https://developercertificate.org); run `git commit --amend --signoff` to sign DCO"
 	} else {
 		vr.Pass = true
 		vr.Msg = "has a valid DCO"

Original file line number	Diff line number	Diff line change
`@@ -41,7 +41,7 @@ func ValidateDCO(r validate.Rule, c git.CommitEntry) (vr validate.Result) {`
`41`	`41`	`}`
`42`	`42`	`if !hasValid {`
`43`	`43`	`vr.Pass = false`
`44`		`- vr.Msg = "does not have a valid DCO"`
	`44`	+ vr.Msg = "does not have a valid Developer Certificate of Origin (DCO, https://developercertificate.org); run `git commit --amend --signoff` to sign DCO"
`45`	`45`	`} else {`
`46`	`46`	`vr.Pass = true`
`47`	`47`	`vr.Msg = "has a valid DCO"`