env GO111MODULE=on

# With good go.sum, verify succeeds by avoiding download.
cp go.sum.good go.sum
go mod -verify
! exists $GOPATH/src/mod/cache/download/rsc.io/quote/@v/v1.1.0.zip

# With bad go.sum, verify succeeds by avoiding download.
cp go.sum.bad go.sum
go mod -verify
! exists $GOPATH/src/mod/cache/download/rsc.io/quote/@v/v1.1.0.zip

# With bad go.sum, sync (which must download) fails.
# Even if the bad sum is in the old legacy go.modverify file.
rm go.sum
cp go.sum.bad go.modverify
! go mod -sync
stderr 'checksum mismatch'
! exists $GOPATH/src/mod/cache/download/rsc.io/quote/@v/v1.1.0.zip

# With good go.sum, sync works (and moves go.modverify to go.sum).
rm go.sum
cp go.sum.good go.modverify
go mod -sync
exists $GOPATH/src/mod/cache/download/rsc.io/quote/@v/v1.1.0.zip
exists $GOPATH/src/mod/rsc.io/quote@v1.1.0/quote.go
! exists go.modverify

# go.sum should have the new checksum for go.mod
grep '^rsc.io/quote v1.1.0/go.mod ' go.sum

# verify should work
go mod -verify

# basic loading of module graph should detect incorrect go.mod files.
go mod -graph
cp go.sum.bad2 go.sum
! go mod -graph
stderr 'go.mod: checksum mismatch'

# go.sum should be created and updated automatically.
rm go.sum
go mod -graph
exists go.sum
grep '^rsc.io/quote v1.1.0/go.mod ' go.sum
! grep '^rsc.io/quote v1.1.0 ' go.sum

go mod -sync
grep '^rsc.io/quote v1.1.0/go.mod ' go.sum
grep '^rsc.io/quote v1.1.0 ' go.sum

# sync should ignore missing ziphash; verify should not
rm $GOPATH/src/mod/cache/download/rsc.io/quote/@v/v1.1.0.ziphash
go mod -sync
! go mod -verify

# Packages below module root should not be mentioned in go.sum.
rm go.sum
go mod -droprequire rsc.io/quote
go list rsc.io/quote/buggy # re-resolves import path and updates go.mod
grep '^rsc.io/quote v1.5.2/go.mod ' go.sum
! grep buggy go.sum

# non-existent packages below module root should not be mentioned in go.sum
go mod -droprequire rsc.io/quote
! go list rsc.io/quote/morebuggy
grep '^rsc.io/quote v1.5.2/go.mod ' go.sum
! grep buggy go.sum

-- go.mod --
module x
require rsc.io/quote v1.1.0

-- x.go --
package x
import _ "rsc.io/quote"

-- go.sum.good --
rsc.io/quote v1.1.0 h1:a3YaZoizPtXyv6ZsJ74oo2L4/bwOSTKMY7MAyo4O/0c=

-- go.sum.bad --
rsc.io/quote v1.1.0 h1:a3YaZoizPtXyv6ZsJ74oo2L4/bwOSTKMY7MAyo4O/1c=

-- go.sum.bad2 --
rsc.io/quote v1.1.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl1=