go clean -modcache


# Also try it with a 'go install' that succeeds.
# (But skip in short mode, because linking a binary is expensive.)
[!short] go install -modcacherw example.com/printversion@v0.1.0
[!short] cp $WORK/extraneous.txt $GOPATH/pkg/mod/example.com/printversion@v0.1.0/extraneous_file.go
[!short] go clean -modcache


# The flag should also be applied if given in GOFLAGS

# This test verifies that GOMODCACHE does not affect whether checksums are embedded
# with vendored files.
# See issue #46400
[short] skip 'builds and links a binary twice'
go mod tidy
go mod vendor

go build -mod=vendor
go version -m example$GOEXE
cp stdout version-m.txt

env GOMODCACHE=$WORK${/}modcache
go build -mod=vendor
go version -m example$GOEXE
cmp stdout version-m.txt

-- go.mod --
module example
go 1.22

[GOOS:windows] env GOPROXY=file:///$WORK/mod1/cache/download
[!GOOS:windows] env GOPROXY=file://$WORK/mod1/cache/download
env GOMODCACHE=$WORK/modcache2


# If we resolve the "latest" version query using a proxy,
# it is only going to have Git origin information about the one
# commit — not the other tags that would go into resolving
# the underlying version list.

					base.Error(err)
				}
			}
		}
	}

	if cleanModcache {
		if cfg.GOMODCACHE == "" {
			base.Fatalf("go: cannot clean -modcache without a module cache")
		}
		if cfg.BuildN || cfg.BuildX {
			sh.ShowCmd("", "rm -rf %s", cfg.GOMODCACHE)
		}
		if !cfg.BuildN {
			if err := modfetch.RemoveAll(cfg.GOMODCACHE); err != nil {
				base.Error(err)
			}
		}
	}

	if cleanFuzzcache {

# downloaded dependencies are read-only
exists -readonly $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
exists -readonly $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/buggy

# go clean -modcache can delete read-only dependencies
go clean -modcache
! exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.2

# list {{.Dir}} shows replaced directories
cp go.mod2 go.mod
go list -mod=mod -f {{.Dir}} rsc.io/quote

cp go.sum saved.sum


# Download from proxy.golang.org with go.sum entry already.
# Use 'go list' instead of 'go get' since the latter may download extra go.mod
# files not listed in go.sum.

go clean -modcache
env GOSUMDB=sum.golang.org
env GOPROXY=https://proxy.golang.org,direct

go list -x -m all  # Download go.mod files.
! stderr github
stderr proxy.golang.org/rsc.io/quote
! stderr sum.golang.org/tile

# Explicitly requesting that same version should succeed, fetching additional
# history for the requested commit as needed in order to validate the
# pseudo-version base.
go clean -modcache
cp go.mod.orig go.mod
go get -x vcs-test.golang.org/git/issue47650.git/cmd/issue47650@v0.1.1-0.20210811175200-21535ef346c3
stderr '^go: added vcs-test.golang.org/git/issue47650.git v0.1.1-0.20210811175200-21535ef346c3$'

cp stdout all.json

# clean the module cache, make sure that makes go mod download re-run git fetch, clean again
go clean -modcache
go mod download -x -json vcs-test.golang.org/git/hello.git@latest
stderr 'git( .*)* fetch'
go clean -modcache

# reuse go mod download vcstest/hello result
go mod download -reuse=hello.json -x -json vcs-test.golang.org/git/hello.git@latest
! stderr 'git( .*)* fetch'

	// Redirect the module cache to a fresh directory to avoid crosstalk, and make
	// it read/write so that the test can still clean it up easily when done.
	cfg.GOMODCACHE = filepath.Join(dir, "modcache")
	cfg.ModCacheRW = true

	m.Run()
	return nil
}

func testContext(t testing.TB) context.Context {
	w := newTestWriter(t)
	return cfg.WithBuildXWriter(context.Background(), w)
}

	// go tool may complain.
	os.Setenv("GOPATH", pathf("%s/pkg/obj/gopath", goroot))

	// Set GOPROXY=off to avoid downloading modules to the modcache in
	// the GOPATH set above to be inside GOROOT. The modcache is read
	// only so if we downloaded to the modcache, we'd create readonly
	// files in GOROOT, which is undesirable. See #67463)
	os.Setenv("GOPROXY", "off")