cmd/go/internal/modcmd: add mod -graph

mod -graph dumps the requirement graph in text form,
for processing by other tools. For example, I wondered
why github.com/moby/buildkit was exploring a very
old version of Kubernetes:

    $ vgo mod -graph |
      digraph somepath github.com/moby/buildkit \
          k8s.io/kubernetes@v0.0.0-20150821172800-a412f6a67e3a
    github.com/moby/buildkit
    github.com/docker/docker@v0.0.0-20180531152204-71cd53e4a197
    github.com/containerd/containerd@v0.0.0-20180226221259-4ac4fd0b6a26
    k8s.io/kubernetes@v0.0.0-20180209063429-05944b1d2ca7
    k8s.io/heapster@v0.0.0-20160819112202-c2ac40f1adf8
    k8s.io/kubernetes@v0.0.0-20160809133706-301be4eeb561
    k8s.io/heapster@v0.0.0-20160517121052-9cb18ac0ceb1
    k8s.io/kubernetes@v0.0.0-20160513071043-4bb30e009782
    k8s.io/heapster@v0.0.0-20160405141354-de510e4bdcde
    k8s.io/kubernetes@v0.0.0-20160219000711-644d651c6907
    k8s.io/heapster@v0.0.0-20160126150510-0991ac528ea2
    k8s.io/kubernetes@v0.0.0-20151104234216-319baeec5ab5
    k8s.io/heapster@v0.0.0-20150824215340-0e1b65278181
    k8s.io/kubernetes@v0.0.0-20150821172800-a412f6a67e3a
    $

Change-Id: I202bfb9828e07e223eafce44f43c251cf24643b3
Reviewed-on: https://go-review.googlesource.com/120197
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2 files changed
tree: 8fa01624391a7adedb1cb2684649809ab33e4823
  1. AUTHORS
  2. CONTRIBUTING.md
  3. CONTRIBUTORS
  4. LICENSE
  5. PATENTS
  6. README.md
  7. codereview.cfg
  8. main.go
  9. vendor/
README.md

Versioned Go Prototype (vgo)

This repository holds a prototype of what the go command might look like with integrated support for package versioning.

See research.swtch.com/vgo for documents about the design.

Download/Install

Use go get -u golang.org/x/vgo.

You can also manually git clone the repository to $GOPATH/src/golang.org/x/vgo.

Report Issues / Send Patches

See CONTRIBUTING.md.

This is still a very early prototype. You are likely to run into bugs. Please file bugs in the main Go issue tracker, golang.org/issue, and put the prefix x/vgo: in the issue title.

Thank you.