src/cmd/go/testdata/script/gotoolchain_local.txt - go - Git at Google

 # This test uses the fake toolchain switch support in cmd/go/internal/toolchain.Switch
 # to exercise all the version selection logic without needing actual toolchains.
 # See gotoolchain_net.txt and gotoolchain_path.txt for tests of network and PATH toolchains.

 env TESTGO_VERSION=go1.500
 env TESTGO_VERSION_SWITCH=switch

 # GOTOOLCHAIN=auto runs default toolchain without a go.mod or go.work
 env GOTOOLCHAIN=auto
 go version
 stdout go1.500

 # GOTOOLCHAIN=path runs default toolchain without a go.mod or go.work
 env GOTOOLCHAIN=path
 go version
 stdout go1.500

 # GOTOOLCHAIN=asdf is a syntax error
 env GOTOOLCHAIN=asdf
 ! go version
 stderr '^go: invalid GOTOOLCHAIN "asdf"$'

 # GOTOOLCHAIN=version is used directly.
 env GOTOOLCHAIN=go1.600
 go version
 stdout go1.600

 env GOTOOLCHAIN=go1.400
 go version
 stdout go1.400

 # GOTOOLCHAIN=version+auto sets a minimum.
 env GOTOOLCHAIN=go1.600+auto
 go version
 stdout go1.600

 env GOTOOLCHAIN=go1.400.0+auto
 go version
 stdout go1.400.0

 # GOTOOLCHAIN=version+path sets a minimum too.
 env GOTOOLCHAIN=go1.600+path
 go version
 stdout go1.600

 env GOTOOLCHAIN=go1.400+path
 go version
 stdout go1.400

 # Create a go.mod file and test interactions with auto and path.

 # GOTOOLCHAIN=auto uses go line if newer than local toolchain.
 env GOTOOLCHAIN=auto
 go mod init m
 go mod edit -go=1.700 -toolchain=none
 go version
 stdout 1.700

 go mod edit -go=1.300 -toolchain=none
 go version
 stdout 1.500 # local toolchain is newer

 go mod edit -go=1.700 -toolchain=go1.300
 go version
 stdout go1.700 # toolchain too old, ignored

 go mod edit -go=1.300 -toolchain=default
 go version
 stdout go1.500

 go mod edit -go=1.700 -toolchain=default
 go version
 stdout go1.500 # toolchain local is like GOTOOLCHAIN=local and wins
 ! go build
 stderr '^go: go.mod requires go >= 1.700 \(running go 1.500; go.mod sets toolchain default\)'

 # GOTOOLCHAIN=path does the same.
 env GOTOOLCHAIN=path
 go mod edit -go=1.700 -toolchain=none
 go version
 stdout 1.700

 go mod edit -go=1.300 -toolchain=none
 go version
 stdout 1.500 # local toolchain is newer

 go mod edit -go=1.700 -toolchain=go1.300
 go version
 stdout go1.700 # toolchain too old, ignored

 go mod edit -go=1.300 -toolchain=default
 go version
 stdout go1.500

 go mod edit -go=1.700 -toolchain=default
 go version
 stdout go1.500 # toolchain default applies even if older than go line
 ! go build
 stderr '^go: go.mod requires go >= 1.700 \(running go 1.500; GOTOOLCHAIN=path; go.mod sets toolchain default\)'

 # GOTOOLCHAIN=min+auto with toolchain default uses min, not local

 env GOTOOLCHAIN=go1.400+auto
 go mod edit -go=1.300 -toolchain=default
 go version
 stdout 1.400 # not 1.500 local toolchain

 env GOTOOLCHAIN=go1.600+auto
 go mod edit -go=1.300 -toolchain=default
 go version
 stdout 1.600 # not 1.500 local toolchain

 # GOTOOLCHAIN names can have -suffix
 env GOTOOLCHAIN=go1.800-bigcorp
 go version
 stdout go1.800-bigcorp

 env GOTOOLCHAIN=auto
 go mod edit -go=1.999 -toolchain=go1.800-bigcorp
 go version
 stdout go1.999

 go mod edit -go=1.777 -toolchain=go1.800-bigcorp
 go version
 stdout go1.800-bigcorp

 # go.work takes priority over go.mod
 go mod edit -go=1.700 -toolchain=go1.999-wrong
 go work init
 go work edit -go=1.400 -toolchain=go1.600-right
 go version
 stdout go1.600-right

 go work edit -go=1.400 -toolchain=default
 go version
 stdout go1.500

 # go.work misconfiguration does not break go work edit
 # ('go 1.600 / toolchain local' forces use of 1.500 which can't normally load that go.work; allow work edit to fix it.)
 go work edit -go=1.600 -toolchain=default
 go version
 stdout go1.500

 go work edit -toolchain=none
 go version
 stdout go1.600

 rm go.work

 # go.mod misconfiguration does not break go mod edit
 go mod edit -go=1.600 -toolchain=default
 go version
 stdout go1.500

 go mod edit -toolchain=none
 go version
 stdout go1.600

 # toolchain built with a custom version should know how it compares to others

 env TESTGO_VERSION=go1.500-bigcorp
 go mod edit -go=1.499 -toolchain=none
 go version
 stdout go1.500-bigcorp

 go mod edit -go=1.499 -toolchain=go1.499
 go version
 stdout go1.500-bigcorp

 go mod edit -go=1.500 -toolchain=none
 go version
 stdout go1.500-bigcorp

 go mod edit -go=1.500 -toolchain=go1.500
 go version
 stdout go1.500-bigcorp

 go mod edit -go=1.501 -toolchain=none
 go version
 stdout go1.501

 	# If toolchain > go, we must upgrade to the indicated toolchain (not just the go version).
 go mod edit -go=1.499 -toolchain=go1.501
 go version
 stdout go1.501

 env TESTGO_VERSION='go1.500 (bigcorp)'
 go mod edit -go=1.499 -toolchain=none
 go version
 stdout 'go1.500 \(bigcorp\)'

 go mod edit -go=1.500 -toolchain=none
 go version
 stdout 'go1.500 \(bigcorp\)'

 go mod edit -go=1.501 -toolchain=none
 go version
 stdout go1.501

 # go install m@v and go run m@v should ignore go.mod and use m@v
 env TESTGO_VERSION=go1.2.3
 go mod edit -go=1.999 -toolchain=go1.998

 ! go install rsc.io/fortune/nonexist@v0.0.1
 stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
 stderr '^go: rsc.io/fortune/nonexist@v0.0.1: module rsc.io/fortune@v0.0.1 found, but does not contain package rsc.io/fortune/nonexist'

 ! go run rsc.io/fortune/nonexist@v0.0.1
 stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
 stderr '^go: rsc.io/fortune/nonexist@v0.0.1: module rsc.io/fortune@v0.0.1 found, but does not contain package rsc.io/fortune/nonexist'

 # go install should handle unknown flags to find m@v
 ! go install -unknownflag rsc.io/fortune/nonexist@v0.0.1
 stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
 stderr '^flag provided but not defined: -unknownflag'

 ! go install -unknownflag arg rsc.io/fortune/nonexist@v0.0.1
 stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
 stderr '^flag provided but not defined: -unknownflag'

 # go run cannot handle unknown boolean flags
 ! go run -unknownflag rsc.io/fortune/nonexist@v0.0.1
 ! stderr switching
 stderr '^flag provided but not defined: -unknownflag'

 ! go run -unknownflag oops rsc.io/fortune/nonexist@v0.0.1
 ! stderr switching
 stderr '^flag provided but not defined: -unknownflag'

 # go run can handle unknown flag with argument.
 ! go run -unknown=flag rsc.io/fortune/nonexist@v0.0.1
 stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
 stderr '^flag provided but not defined: -unknown'

 # go install m@v should handle queries
 ! go install rsc.io/fortune/nonexist@v0.0
 stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
 stderr '^go: rsc.io/fortune/nonexist@v0.0: module rsc.io/fortune@v0.0 found \(v0.0.1\), but does not contain package rsc.io/fortune/nonexist'

 # go run m@v should handle queries
 ! go install rsc.io/fortune/nonexist@v0
 stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
 stderr '^go: rsc.io/fortune/nonexist@v0: module rsc.io/fortune@v0 found \(v0.0.1\), but does not contain package rsc.io/fortune/nonexist'

 # go install m@v should use local toolchain if not upgrading
 ! go install rsc.io/fortune/nonexist@v1
 ! stderr go1.22.9
 ! stderr switching
 stderr '^go: downloading rsc.io/fortune v1.0.0$'
 stderr '^go: rsc.io/fortune/nonexist@v1: module rsc.io/fortune@v1 found \(v1.0.0\), but does not contain package rsc.io/fortune/nonexist'

 # go run m@v should use local toolchain if not upgrading
 ! go run rsc.io/fortune/nonexist@v1
 ! stderr go1.22.9
 ! stderr switching
 stderr '^go: rsc.io/fortune/nonexist@v1: module rsc.io/fortune@v1 found \(v1.0.0\), but does not contain package rsc.io/fortune/nonexist'
	# This test uses the fake toolchain switch support in cmd/go/internal/toolchain.Switch
	# to exercise all the version selection logic without needing actual toolchains.
	# See gotoolchain_net.txt and gotoolchain_path.txt for tests of network and PATH toolchains.

	env TESTGO_VERSION=go1.500
	env TESTGO_VERSION_SWITCH=switch

	# GOTOOLCHAIN=auto runs default toolchain without a go.mod or go.work
	env GOTOOLCHAIN=auto
	go version
	stdout go1.500

	# GOTOOLCHAIN=path runs default toolchain without a go.mod or go.work
	env GOTOOLCHAIN=path
	go version
	stdout go1.500

	# GOTOOLCHAIN=asdf is a syntax error
	env GOTOOLCHAIN=asdf
	! go version
	stderr '^go: invalid GOTOOLCHAIN "asdf"$'

	# GOTOOLCHAIN=version is used directly.
	env GOTOOLCHAIN=go1.600
	go version
	stdout go1.600

	env GOTOOLCHAIN=go1.400
	go version
	stdout go1.400

	# GOTOOLCHAIN=version+auto sets a minimum.
	env GOTOOLCHAIN=go1.600+auto
	go version
	stdout go1.600

	env GOTOOLCHAIN=go1.400.0+auto
	go version
	stdout go1.400.0

	# GOTOOLCHAIN=version+path sets a minimum too.
	env GOTOOLCHAIN=go1.600+path
	go version
	stdout go1.600

	env GOTOOLCHAIN=go1.400+path
	go version
	stdout go1.400

	# Create a go.mod file and test interactions with auto and path.

	# GOTOOLCHAIN=auto uses go line if newer than local toolchain.
	env GOTOOLCHAIN=auto
	go mod init m
	go mod edit -go=1.700 -toolchain=none
	go version
	stdout 1.700

	go mod edit -go=1.300 -toolchain=none
	go version
	stdout 1.500 # local toolchain is newer

	go mod edit -go=1.700 -toolchain=go1.300
	go version
	stdout go1.700 # toolchain too old, ignored

	go mod edit -go=1.300 -toolchain=default
	go version
	stdout go1.500

	go mod edit -go=1.700 -toolchain=default
	go version
	stdout go1.500 # toolchain local is like GOTOOLCHAIN=local and wins
	! go build
	stderr '^go: go.mod requires go >= 1.700 \(running go 1.500; go.mod sets toolchain default\)'

	# GOTOOLCHAIN=path does the same.
	env GOTOOLCHAIN=path
	go mod edit -go=1.700 -toolchain=none
	go version
	stdout 1.700

	go mod edit -go=1.300 -toolchain=none
	go version
	stdout 1.500 # local toolchain is newer

	go mod edit -go=1.700 -toolchain=go1.300
	go version
	stdout go1.700 # toolchain too old, ignored

	go mod edit -go=1.300 -toolchain=default
	go version
	stdout go1.500

	go mod edit -go=1.700 -toolchain=default
	go version
	stdout go1.500 # toolchain default applies even if older than go line
	! go build
	stderr '^go: go.mod requires go >= 1.700 \(running go 1.500; GOTOOLCHAIN=path; go.mod sets toolchain default\)'

	# GOTOOLCHAIN=min+auto with toolchain default uses min, not local

	env GOTOOLCHAIN=go1.400+auto
	go mod edit -go=1.300 -toolchain=default
	go version
	stdout 1.400 # not 1.500 local toolchain

	env GOTOOLCHAIN=go1.600+auto
	go mod edit -go=1.300 -toolchain=default
	go version
	stdout 1.600 # not 1.500 local toolchain

	# GOTOOLCHAIN names can have -suffix
	env GOTOOLCHAIN=go1.800-bigcorp
	go version
	stdout go1.800-bigcorp

	env GOTOOLCHAIN=auto
	go mod edit -go=1.999 -toolchain=go1.800-bigcorp
	go version
	stdout go1.999

	go mod edit -go=1.777 -toolchain=go1.800-bigcorp
	go version
	stdout go1.800-bigcorp

	# go.work takes priority over go.mod
	go mod edit -go=1.700 -toolchain=go1.999-wrong
	go work init
	go work edit -go=1.400 -toolchain=go1.600-right
	go version
	stdout go1.600-right

	go work edit -go=1.400 -toolchain=default
	go version
	stdout go1.500

	# go.work misconfiguration does not break go work edit
	# ('go 1.600 / toolchain local' forces use of 1.500 which can't normally load that go.work; allow work edit to fix it.)
	go work edit -go=1.600 -toolchain=default
	go version
	stdout go1.500

	go work edit -toolchain=none
	go version
	stdout go1.600

	rm go.work

	# go.mod misconfiguration does not break go mod edit
	go mod edit -go=1.600 -toolchain=default
	go version
	stdout go1.500

	go mod edit -toolchain=none
	go version
	stdout go1.600

	# toolchain built with a custom version should know how it compares to others

	env TESTGO_VERSION=go1.500-bigcorp
	go mod edit -go=1.499 -toolchain=none
	go version
	stdout go1.500-bigcorp

	go mod edit -go=1.499 -toolchain=go1.499
	go version
	stdout go1.500-bigcorp

	go mod edit -go=1.500 -toolchain=none
	go version
	stdout go1.500-bigcorp

	go mod edit -go=1.500 -toolchain=go1.500
	go version
	stdout go1.500-bigcorp

	go mod edit -go=1.501 -toolchain=none
	go version
	stdout go1.501

	# If toolchain > go, we must upgrade to the indicated toolchain (not just the go version).
	go mod edit -go=1.499 -toolchain=go1.501
	go version
	stdout go1.501

	env TESTGO_VERSION='go1.500 (bigcorp)'
	go mod edit -go=1.499 -toolchain=none
	go version
	stdout 'go1.500 \(bigcorp\)'

	go mod edit -go=1.500 -toolchain=none
	go version
	stdout 'go1.500 \(bigcorp\)'

	go mod edit -go=1.501 -toolchain=none
	go version
	stdout go1.501

	# go install m@v and go run m@v should ignore go.mod and use m@v
	env TESTGO_VERSION=go1.2.3
	go mod edit -go=1.999 -toolchain=go1.998

	! go install rsc.io/fortune/nonexist@v0.0.1
	stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
	stderr '^go: rsc.io/fortune/nonexist@v0.0.1: module rsc.io/fortune@v0.0.1 found, but does not contain package rsc.io/fortune/nonexist'

	! go run rsc.io/fortune/nonexist@v0.0.1
	stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
	stderr '^go: rsc.io/fortune/nonexist@v0.0.1: module rsc.io/fortune@v0.0.1 found, but does not contain package rsc.io/fortune/nonexist'

	# go install should handle unknown flags to find m@v
	! go install -unknownflag rsc.io/fortune/nonexist@v0.0.1
	stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
	stderr '^flag provided but not defined: -unknownflag'

	! go install -unknownflag arg rsc.io/fortune/nonexist@v0.0.1
	stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
	stderr '^flag provided but not defined: -unknownflag'

	# go run cannot handle unknown boolean flags
	! go run -unknownflag rsc.io/fortune/nonexist@v0.0.1
	! stderr switching
	stderr '^flag provided but not defined: -unknownflag'

	! go run -unknownflag oops rsc.io/fortune/nonexist@v0.0.1
	! stderr switching
	stderr '^flag provided but not defined: -unknownflag'

	# go run can handle unknown flag with argument.
	! go run -unknown=flag rsc.io/fortune/nonexist@v0.0.1
	stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
	stderr '^flag provided but not defined: -unknown'

	# go install m@v should handle queries
	! go install rsc.io/fortune/nonexist@v0.0
	stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
	stderr '^go: rsc.io/fortune/nonexist@v0.0: module rsc.io/fortune@v0.0 found \(v0.0.1\), but does not contain package rsc.io/fortune/nonexist'

	# go run m@v should handle queries
	! go install rsc.io/fortune/nonexist@v0
	stderr '^go: rsc.io/fortune@v0.0.1 requires go >= 1.21rc999; switching to go1.22.9$'
	stderr '^go: rsc.io/fortune/nonexist@v0: module rsc.io/fortune@v0 found \(v0.0.1\), but does not contain package rsc.io/fortune/nonexist'

	# go install m@v should use local toolchain if not upgrading
	! go install rsc.io/fortune/nonexist@v1
	! stderr go1.22.9
	! stderr switching
	stderr '^go: downloading rsc.io/fortune v1.0.0$'
	stderr '^go: rsc.io/fortune/nonexist@v1: module rsc.io/fortune@v1 found \(v1.0.0\), but does not contain package rsc.io/fortune/nonexist'

	# go run m@v should use local toolchain if not upgrading
	! go run rsc.io/fortune/nonexist@v1
	! stderr go1.22.9
	! stderr switching
	stderr '^go: rsc.io/fortune/nonexist@v1: module rsc.io/fortune@v1 found \(v1.0.0\), but does not contain package rsc.io/fortune/nonexist'