//
// Lookup should only be used with non-factored verbs
// such as "go" and "toolchain", usually to find versions
// or version-like strings.
func GoModLookup(gomod []byte, key string) string {
	for len(gomod) > 0 {
		var line []byte
		line, gomod, _ = bytes.Cut(gomod, nl)
		line = bytes.TrimSpace(line)
		if v, ok := parseKey(line, key); ok {
			return v
		}
	}
	return ""
}

env TESTGO_VERSION=go1.500
env TESTGO_VERSION_SWITCH=mismatch

# go env GOMOD should not trigger a toolchain download
cd $GOPATH/mod
go env GOMOD
stdout mod[/\\]go.mod
! stderr 'go: toolchain go1.500 invoked to provide go1.700'

# go env GOWORK should not trigger a toolchain download
cd $GOPATH/work
go env GOWORK
stdout work[/\\]go.work
! stderr 'go: toolchain go1.500 invoked to provide go1.700'

-- $GOPATH/mod/go.mod --

go mod init example.com/m
grep example.com/m go.alt.mod

# 'go env GOMOD' should print the path to the real file.
# 'go env' does not recognize the '-modfile' flag.
go env GOMOD
stdout '^'$WORK${/}gopath${/}src${/}'go\.mod$'

# 'go list -m' should print the effective go.mod file as GoMod though.
go list -m -f '{{.GoMod}}'
stdout '^go.alt.mod$'

# go mod edit should operate on the alternate file

# list {{.Dir}} shows replaced directories
cp go.mod2 go.mod
go list -mod=mod -f {{.Dir}} rsc.io/quote
go list -m -f '{{.Path}} {{.Version}} {{.Dir}}{{with .Replace}} {{.GoMod}} => {{.Version}} {{.Dir}} {{.GoMod}}{{end}}' all
stdout 'mod[\\/]rsc.io[\\/]quote@v1.5.1'
stdout 'v1.3.0.*mod[\\/]rsc.io[\\/]sampler@v1.3.1 .*[\\/]v1.3.1.mod => v1.3.1.*sampler@v1.3.1 .*[\\/]v1.3.1.mod'

# list std should work
go list std

cd ../4-to-1
go list -m gopkg.in/src-d/go-git.v4

cd ../4-to-incompatible
go list -m gopkg.in/src-d/go-git.v4

# A mismatched gopkg.in path should not be able to replace a different major version.
cd ../3-to-gomod-4
! go list -m gopkg.in/src-d/go-git.v3

# ensure that 'direct' mode can resolve the package to the module.
# For a while, (*modfetch.codeRepo).Stat was not checking for a go.mod file,
# which would produce a hard error at the subsequent call to GoMod.

go get -v

-- go.mod --
module example.com
go 1.13

-- main.go --
package main

import _ "vcs-test.golang.org/git/v3pkg.git/v3"

stderr 'chdir.*nonexist'

# check for -C in subcommands with custom flag parsing
# cmd/go/chdir_test.go handles the normal ones more directly.

# go doc
go doc -C ../strings HasPrefix

# go env
go env -C $OLD/custom GOMOD
stdout 'custom[\\/]go.mod'
! go env -C ../nonexist
stderr '^go: chdir ../nonexist: '

# go test
go test -C ../strings -n
stderr 'strings\.test'

# go vet
go vet -C ../strings -n
stderr strings_test

# Configures Depdendabot to PR go security updates only

version: 2
updates:
  # Go configuration for master branch
  - package-ecosystem: "gomod"
    directory: "/"
    schedule:
      interval: "daily"
    # Limit number of open PRs to 0 so that we only get security updates
    # See https://docs.github.com/en/code-security/dependabot/dependabot-security-updates/configuring-dependabot-security-updates
    open-pull-requests-limit: 0
    labels:

! go run  example.com/b
stderr 'a(\\|/)a.go:4:8: no required module provides package rsc.io/quote; to add it:\n\tcd '$WORK(\\|/)gopath(\\|/)src(\\|/)a'\n\tgo get rsc.io/quote'
cd a
go get rsc.io/quote
cat go.mod
go env GOMOD # go env GOMOD reports the module in a single module context
stdout $GOPATH(\\|/)src(\\|/)a(\\|/)go.mod
cd ..
go run example.com/b
stdout 'Hello, world.'

# And try from a different directory
cd c
go run  example.com/b

	testenv.MustHaveGoRun(t)
	t.Parallel()

	const pkg = "example.com/pgo/devirtualize"

	// Add a go.mod so we have a consistent symbol names in this temp dir.
	goMod := fmt.Sprintf(`module %s
go 1.21
`, pkg)
	if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte(goMod), 0644); err != nil {
		t.Fatalf("error writing go.mod: %v", err)
	}

	// Run the test without PGO to ensure that the test assertions are