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cmd/go: go get -u behaves differently with and without GOPROXY when a module doesn't exist at head #31766
$ go version go version devel +fbc6a97222 Mon Apr 29 19:54:30 2019 +0000 linux/amd64
The problem exists with go1.12 as well.
What did you do?
Without proxy, I could run
$ export GOPROXY=direct $ mkdir scratch; cd scratch; go mod init example $ go get github.com/spf13/viper $ go get -u go: finding golang.org/x/sys latest go: finding golang.org/x/crypto latest go: finding golang.org/x/tools latest go: finding github.com/ugorji/go/codec latest go: finding gopkg.in/check.v1 latest go: finding golang.org/x/sync latest go: finding golang.org/x/net latest go: finding github.com/armon/consul-api latest
$ export GOPROXY=https://proxy.golang.org $ mkdir scratch; cd scratch; go mod init example $ go get github.com/spf13/viper $ go get -u go get: upgrading email@example.com: reading https://proxy.golang.org/github.com/ugorji/go/codec/@v/list: 404 Not Found
What happens underneath:
The viper module or its dependencies have dependency on firstname.lastname@example.org. The
But when trying to upgrade, with GOPROXY=direct, the go command runs a sequence of git commands and detects there is no tag, no go.mod file at head and doesn't attempt to upgrade.
With GOPROXY=, the go command queries /@v/list endpoint to find available module versions. The proxy doesn't know about the named module (because the module doesn't exist according to what
I think in this case (the list query failure), the go command should not fail but proceed as if there is no newer version to upgrade (indeed, there is no version to upgrade to!)