Link to License Allowlist

When a license validation warning is generated, link to the allowlist file for easy fixing.


Bug: 382745675
Change-Id: I4899401a687ce06e74cd18a95e1a28a2684a8027
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6076211
Reviewed-by: Jordan Brown <rop@google.com>
Commit-Queue: Jordan Brown <rop@google.com>
Reviewed-by: Rachael Newitt <renewitt@google.com>
Auto-Submit: Jordan Brown <rop@google.com>

metadata/fields/custom/license.py

@@ -98,7 +98,8 @@ class LicenseField(field_types.SingleLineTextField):
 
         if not_allowlisted:
             return vr.ValidationWarning(
-                reason=f"{self._name} has a license not in the allowlist.",
+                reason=f"{self._name} has a license not in the allowlist."
+                " (see https://source.chromium.org/chromium/chromium/tools/depot_tools/+/main:metadata/fields/custom/license_allowlist.py).",
                 additional=[
                     "Licenses not allowlisted: "
                     f"{util.quoted(not_allowlisted)}.",