// "upgrade" or "patch", current will be returned if it is a newer
// semantic version or a chronologically later pseudo-version than the
// version that would otherwise be chosen. This prevents accidental downgrades
// from newer pre-release or development versions.
//
// The allowed function (which may be nil) is used to filter out unsuitable
// versions (see AllowedFunc documentation for details). If the query refers to

go get rsc.io/sampler@none
stderr '^go: downgraded rsc.io/quote v1.5.2 => v1.3.0$'
stderr '^go: removed rsc.io/sampler v1.3.0$'
! stderr '^go get.*golang.org/x/text'
cmp go.mod go.mod.downgrade

# When removing or downgrading a requirement, 'go get' also prints a message
# for explicit dependencies removed as a consequence.
cp go.mod.usequote go.mod
go get rsc.io/quote@v1.5.1
stderr '^go: downgraded rsc.io/quote v1.5.2 => v1.5.1$'

//go:generate stringer -type VersionType,ErasureAlgo -output=xl-storage-format-v2_string.go $GOFILE

const (
	// Breaking changes.
	// Newer versions cannot be read by older software.
	// This will prevent downgrades to incompatible versions.
	xlVersionMajor = 1

	// Non breaking changes.
	// Bumping this is informational, but should be done
	// if any change is made to the data stored, bumping this

env GO111MODULE=on
[short] skip

# downgrade sampler should downgrade quote
cp go.mod.orig go.mod
go get rsc.io/sampler@v1.0.0
go list -m all
stdout 'rsc.io/quote v1.4.0'
stdout 'rsc.io/sampler v1.0.0'

# downgrade sampler away should downgrade quote further
go get rsc.io/sampler@none
go list -m all
stdout 'rsc.io/quote v1.3.0'

# downgrade should report inconsistencies and not change go.mod
go get rsc.io/quote@v1.5.1
go list -m all

stderr '^go: removed toolchain go1.999testmod$'
grep 'go 1.23.9' go.mod
! grep 'toolchain go1.23.9' go.mod  # implied

# go get toolchain@go1.22 should use the latest Go 1.22 and downgrade go.
go get toolchain@go1.22
stderr '^go: downgraded go 1.23.9 => 1.22.9$'
grep 'go 1.22.9' go.mod
! grep 'toolchain go1.22.9' go.mod # implied

# go get toolchain@patch should use the latest patch release
go get toolchain@go1.22.1

stderr '^go: added toolchain go1.22.1$'
! stderr '(added|removed|upgraded|downgraded) go'
grep 'toolchain go1.22.1' go.mod

go get toolchain@none
stderr '^go: removed toolchain go1.22.1$'
! stderr '(added|removed|upgraded|downgraded) go'
! grep toolchain go.mod

go get toolchain@go1.22.1
stderr '^go: added toolchain go1.22.1$'
! stderr '(added|removed|upgraded|downgraded) go'
grep 'toolchain go1.22.1' go.mod

go get go@1.22.3

//
// Although most of the loading state is maintained in the loader struct,
// one key piece - the build list - is a global, so that it can be modified
// separate from the loading operation, such as during "go get"
// upgrades/downgrades or in "go mod" operations.
// TODO(#40775): It might be nice to make the loader take and return
// a buildList rather than hard-coding use of the global.
//

go list -m -u all
stdout '^example.com/pseudoupgrade v0.1.1-0.20190429073117-b5426c86b553$'

# 'get -u' should not downgrade to the (lower) tagged version.
go get -u
go list -m -u all
stdout '^example.com/pseudoupgrade v0.1.1-0.20190429073117-b5426c86b553$'

# 'get example.com/pseudoupgrade@upgrade' should not downgrade.
go get example.com/pseudoupgrade@upgrade
go list -m all

example.com/downgrade/v2 v2.0.1
written by hand

-- .mod --
module example.com/downgrade/v2

require rsc.io/quote v1.5.2
-- .info --
{"Version":"v2.0.1"}
-- go.mod --
module example.com/downgrade/v2

example.com/downgrade v2.0.0
written by hand

-- .mod --
module example.com/downgrade

require rsc.io/quote v1.5.2
-- .info --