xcaddy development mode fails if 'go.mod' includes 'replace' directive

[simnalamburt]

How to reproduce this issue:

Clone https://github.com/simnalamburt/xcaddybug and try to build with xcaddy.

// main.go
package xcaddybug
import "example.com/stringutil"
import "github.com/caddyserver/caddy/v2"

func init() {
	caddy.RegisterModule(Example{})
}
type Example struct {}
func (Example) CaddyModule() caddy.ModuleInfo {
	return caddy.ModuleInfo{
		ID:  caddy.ModuleID(stringutil.Reverse("elpmaxe.oof")),
		New: func() caddy.Module { return new(Example) },
	}
}

// go.mod
module github.com/simnalamburt/xcaddybug
go 1.17
replace example.com v0.0.1 => golang.org/x/example v0.0.0-20210811190340-787a929d5a0d
require (
	example.com v0.0.1
	github.com/caddyserver/caddy/v2 v2.4.3
)

Error message:

2021/08/29 22:55:01 [INFO] Resolved relative replacement example.com=>golang.org/x/example v0.0.0-20210811190340-787a929d5a0d to /home/simnalamburt/workspace/xcaddybug/golang.org/x/example v0.0.0-20210811190340-787a929d5a0d
2021/08/29 22:55:01 [INFO] Temporary folder: /tmp/buildenv_2021-08-29-2255.2607006221
2021/08/29 22:55:01 [INFO] Writing main module: /tmp/buildenv_2021-08-29-2255.2607006221/main.go
2021/08/29 22:55:01 [INFO] Initializing Go module
2021/08/29 22:55:01 [INFO] exec (timeout=10s): /usr/sbin/go mod init caddy
go: creating new go.mod: module caddy
go: to add module requirements and sums:
        go mod tidy
2021/08/29 22:55:01 [INFO] Replace github.com/simnalamburt/xcaddybug => /home/simnalamburt/workspace/xcaddybug
2021/08/29 22:55:01 [INFO] exec (timeout=10s): /usr/sbin/go mod edit -replace github.com/simnalamburt/xcaddybug=/home/simnalamburt/workspace/xcaddybug
2021/08/29 22:55:01 [INFO] Replace example.com => /home/simnalamburt/workspace/xcaddybug/golang.org/x/example v0.0.0-20210811190340-787a929d5a0d
2021/08/29 22:55:01 [INFO] exec (timeout=10s): /usr/sbin/go mod edit -replace example.com=/home/simnalamburt/workspace/xcaddybug/golang.org/x/example@v0.0.0-20210811190340-787a929d5a0d
2021/08/29 22:55:01 [INFO] Pinning versions
2021/08/29 22:55:01 [INFO] exec (timeout=0s): /usr/sbin/go get -d -v github.com/caddyserver/caddy/v2
go: errors parsing go.mod:
/tmp/buildenv_2021-08-29-2255.2607006221/go.mod:7: replacement module directory path "/home/simnalamburt/workspace/xcaddybug/golang.org/x/example" cannot have version
2021/08/29 22:55:01 [ERROR] exit status 1

References

• https://github.com/caddyserver/xcaddy/blob/b8a0d4664/cmd/xcaddy/main.go#L186-L209

[simnalamburt]

Patch of this issue has been proposed: #69

Use forked version of xcaddy if you need to workaround this issue right now:

go install github.com/simnalamburt/xcaddy/cmd/xcaddy@466a1a4b86