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# This test illustrates a case where downgrading one module may upgrade another.
# This is the same as mod_get_downup_indirect, but using modules
# with graph pruning enabled (go ≥ 1.17).
# Compare to the downcross1 test case in cmd/go/internal/mvs/mvs_test.go.
# The package import graph used in this test looks like:
#
# a ---- b
# \ \
# \ \
# ----- c ---- d
#
# The module dependency graph originally looks like:
#
# a ---- b.2
# \ \
# \ \
# ----- c.1 ---- d.2
#
# b.1 ---- c.2
#
# If we downgrade module d to version 1, we must downgrade b as well.
# If that downgrade selects b version 1, we will upgrade module c to version 2.
cp go.mod go.mod.orig
go mod tidy
cmp go.mod.orig go.mod
# Downgrading d to version 1 downgrades b, which upgrades c.
go get -v example.com/d@v0.1.0
go list -m all
stdout '^example.com/b v0.1.0 '
stdout '^example.com/c v0.2.0 '
stdout '^example.com/d v0.1.0 '
cmp go.mod go.mod.down1
# Restoring c to version 1 upgrades d to meet c's requirements.
go get example.com/c@v0.1.0
go list -m all
! stdout '^example.com/b '
stdout '^example.com/c v0.1.0 '
stdout '^example.com/d v0.2.0 '
cmp go.mod go.mod.down2
# If a user explicitly requests the incompatible versions together,
# 'go get' should explain why they are not compatible.
! go get example.com/c@v0.1.0 example.com/d@v0.1.0
stderr '^go: example\.com/c@v0\.1\.0 requires example\.com/d@v0\.2\.0, not example\.com/d@v0\.1\.0'
-- go.mod --
module example.com/a
go 1.17
require (
example.com/b v0.2.0
example.com/c v0.1.0
)
replace (
example.com/b v0.1.0 => ./b1
example.com/b v0.2.0 => ./b2
example.com/c v0.1.0 => ./c1
example.com/c v0.2.0 => ./c2
example.com/d v0.1.0 => ./d
example.com/d v0.2.0 => ./d
)
-- go.mod.down1 --
module example.com/a
go 1.17
require (
example.com/b v0.1.0
example.com/c v0.2.0
)
require example.com/d v0.1.0 // indirect
replace (
example.com/b v0.1.0 => ./b1
example.com/b v0.2.0 => ./b2
example.com/c v0.1.0 => ./c1
example.com/c v0.2.0 => ./c2
example.com/d v0.1.0 => ./d
example.com/d v0.2.0 => ./d
)
-- go.mod.down2 --
module example.com/a
go 1.17
require example.com/c v0.1.0
require example.com/d v0.2.0 // indirect
replace (
example.com/b v0.1.0 => ./b1
example.com/b v0.2.0 => ./b2
example.com/c v0.1.0 => ./c1
example.com/c v0.2.0 => ./c2
example.com/d v0.1.0 => ./d
example.com/d v0.2.0 => ./d
)
-- a.go --
package a
import (
_ "example.com/b"
_ "example.com/c"
)
-- b1/go.mod --
module example.com/b
go 1.17
require example.com/c v0.2.0
-- b1/b.go --
package b
import _ "example.com/c"
-- b2/go.mod --
module example.com/b
go 1.17
require example.com/c v0.1.0
-- b2/b.go --
package b
import _ "example.com/c"
-- c1/go.mod --
module example.com/c
go 1.17
require example.com/d v0.2.0
-- c1/c.go --
package c
-- c2/go.mod --
module example.com/c
go 1.17
-- c2/c.go --
package c
-- d/go.mod --
module example.com/d
go 1.17
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