go plugin doesn't honor godeps file

[Laurent Sesquès]

When trying to build a snap for telegraf (github.com/influxdata/telegraf), using the 'go' plugin, I got the following error:

package github.com/openzipkin/zipkin-go-opentracing/_thrift/gen-go/zipkincore: cannot find package "github.com/openzipkin/zipkin-go-opentracing/_thrift/gen-go/zipkincore" in any of:
 /usr/lib/go-1.8/src/github.com/openzipkin/zipkin-go-opentracing/_thrift/gen-go/zipkincore (from $GOROOT)
 /home/sajoupa/go/src/github.com/openzipkin/zipkin-go-opentracing/_thrift/gen-go/zipkincore (from $GOPATH)

This is because telegraf uses a specific commit for this package, as specified in Godeps. And between this commit, and the most recent, this path was updated.
But snapcraft uses 'go get [..]/telegraf/...', so, latest version of sub-packages.

As far as I can see, snapcraft doesn't support specifying package versions in Godeps, but a lot of projects use it, so it would be pretty useful ?

Thanks,
Laurent

snapcraft.yaml to reproduce:
name: telegraf
version: 1.5.2
summary: Telegraf agent
description: |
  Telegraf is an agent written in Go for collecting, processing, aggregating, and writing metrics
confinement: classic
grade: devel
apps:
  telegraf:
    command: telegraf
    daemon: simple
parts:
  telegraf:
    source: https://github.com/influxdb/telegraf.git
    go-importpath: github.com/influxdb/telegraf
    plugin: go

[Sergio Schvezov (sergiusens)]

We have a `godeps` plugin just for this. If this is not the `godeps` incantation you are looking for, given there are many implementations and exploratory tools that led to vendoring in go today I suggest you open a new Wishlist bug with a link to the specific godep tool.