失败信息：
[WARN] Unable to checkout golang.org/x/net
[ERROR] Update failed for golang.org/x/net: Cannot detect VCS
[WARN] Unable to checkout golang.org/x/sys
[ERROR] Update failed for golang.org/x/sys: Cannot detect VCS
[WARN] Unable to checkout golang.org/x/text
[ERROR] Update failed for golang.org/x/text: Cannot detect VCS
以通过设置golang.org镜像到github.com/golang 来解决
1 $ glide mirror set https://golang.org/x/mobile https://github.com/golang/mobile --vcs git 2 $ glide mirror set https://golang.org/x/crypto https://github.com/golang/crypto --vcs git 3 $ glide mirror set https://golang.org/x/net https://github.com/golang/net --vcs git 4 $ glide mirror set https://golang.org/x/tools https://github.com/golang/tools --vcs git 5 $ glide mirror set https://golang.org/x/text https://github.com/golang/text --vcs git 6 $ glide mirror set https://golang.org/x/image https://github.com/golang/image --vcs git 7 $ glide mirror set https://golang.org/x/sys https://github.com/golang/sys --vcs git
