scripts: add 'BOM' update script

[gyuho]

Need this script when we add external dependencies.

c.f. #7896

[heyitsanthony]

probably shouldn't hardcode the SHA since this might mask BOM bugs and CI uses master

[heyitsanthony]

mkdir gopath/
ln -s  gopath/src
GOPATH=`pwd`/gopath license-bill-of-materials \
    --override-file ./bill-of-materials.override.json \
    github.com/coreos/etcd github.com/coreos/etcd/etcdctl > ./bill-of-materials.json
rm -rf gopath

?

[gyuho]

Doesn't seem to work with symlinks of symlinks?

rm -rf ./gopath
mkdir -p ./gopath
ln -s ./cmd/vendor ./gopath/src

GOPATH=`pwd`/gopath license-bill-of-materials \
    --override-file ./bill-of-materials.override.json \
    github.com/coreos/etcd github.com/coreos/etcd/etcdctl

Will try other commands as well

[gyuho]

2017/05/08 16:01:06 can't load package: package github.com/coreos/etcd: cannot find package "github.com/coreos/etcd" in any of:
	/usr/local/go/src/github.com/coreos/etcd (from $GOROOT)
	/Users/gyuho/go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd (from $GOPATH)
can't load package: package github.com/coreos/etcd/etcdctl: cannot find package "github.com/coreos/etcd/etcdctl" in any of:
	/usr/local/go/src/github.com/coreos/etcd/etcdctl (from $GOROOT)
	/Users/gyuho/go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/etcdctl (from $GOPATH)

[fanminshi]

Checking bill of materials...
2a3,7
> 		"project": "bitbucket.org/ww/goautoneg",
> 		"license": "BSD 3-clause \"New\" or \"Revised\" License",
> 		"confidence": 1
> 	},
> 	{
205,209d209
< 		"confidence": 1
< 	},
< 	{
< 		"project": "bitbucket.org/ww/goautoneg",
< 		"license": "BSD 3-clause \"New\" or \"Revised\" License",
vendored licenses do not match given bill of materials

via https://travis-ci.org/coreos/etcd/jobs/230138438

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@aac2292). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #7897   +/-   ##
=========================================
  Coverage          ?   75.81%           
=========================================
  Files             ?      332           
  Lines             ?    26285           
  Branches          ?        0           
=========================================
  Hits              ?    19928           
  Misses            ?     4940           
  Partials          ?     1417

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[gyuho]

PTAL.

This should fix the current Travis failures.

[heyitsanthony]

lgtm thanks