# Signing Transforms

Signing kinds are passed a single dependent job (from its kind dependency) to act
on.

The transforms in `taskcluster/gecko_taskgraph/transforms/signing.py` implement
this common functionality. They expect a "signing description", and produce a
task definition. The schema for a signing description is defined at the top of
`signing.py`, with copious comments.

In particular you define a set of upstream artifact urls (that point at the
dependent task) and can optionally provide a dependent name (defaults to build)
for use in `task-reference`/`artifact-reference`. You also need to provide
the signing formats to use.