cmd/pprof: use netrc for user/password authentication

[prashantv]

What version of Go are you using (go version)?

$ go version
go version go1.14.2 darwin/amd64

Does this issue reproduce with the latest release?

Yes.

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/prashant/Library/Caches/go-build"
GOENV="/Users/prashant/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/prashant/gocode"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/Cellar/go/1.14.2_1/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.14.2_1/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/db/_9qlqsfd5zbckpmfx7jbkpr80000gn/T/go-build663148624=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Use go tool pprof to fetch a profile from an internal site that is protected behind auth. Authentication information is written to ~/.netrc and curl -n <url> works fine. Since Go supports netrc for getting modules, it would be great if pprof could similarly support netrc files.

What did you expect to see?

go tool pprof to use authentication information from ~/.netrc.

What did you see instead?

401, as the user/information is not used.

[cagedmantis]

/cc @hyangah

[hyangah]

@bcmills what do you think about moving cmd/go/internal/auth to somewhere so cmd/pprof can reuse?

[bcmills]

I think it would be fine to factor out cmd/go/internal/auth to somewhere in cmd/internal.