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env GO111MODULE=on
# Derive module path from import comment.
cd $WORK/x
exists x.go
go mod init
stderr 'module x'
# Import comment works even with CRLF line endings.
rm go.mod
addcrlf x.go
go mod init
stderr 'module x'
# Derive module path from location inside GOPATH.
# 'go mod init' should succeed if modules are not explicitly disabled.
cd $GOPATH/src/example.com/x/y
go mod init
stderr 'module example.com/x/y$'
rm go.mod
# go mod init rejects a zero-length go.mod file
cp $devnull go.mod # can't use touch to create it because Windows
! go mod init
stderr 'go.mod already exists'
# Module path from Godeps/Godeps.json overrides GOPATH.
cd $GOPATH/src/example.com/x/y/z
go mod init
stderr 'unexpected.com/z'
rm go.mod
# Empty directory outside GOPATH fails.
mkdir $WORK/empty
cd $WORK/empty
! go mod init
stderr 'cannot determine module path for source directory'
rm go.mod
# Empty directory inside GOPATH/src uses location inside GOPATH.
mkdir $GOPATH/src/empty
cd $GOPATH/src/empty
go mod init
stderr 'empty'
rm go.mod
# In Plan 9, directories are automatically created in /n.
# For example, /n/go.mod always exist, but it's a directory.
# Test that we ignore directories when trying to find go.mod.
cd $WORK/gomoddir
! go list .
stderr 'cannot find main module'
[!symlink] stop
# gplink1/src/empty where gopathlink -> GOPATH
symlink $WORK/gopathlink -> gopath
cd $WORK/gopathlink/src/empty
go mod init
rm go.mod
# GOPATH/src/link where link -> out of GOPATH
symlink $GOPATH/src/link -> $WORK/empty
cd $WORK/empty
! go mod init
cd $GOPATH/src/link
go mod init
stderr link
rm go.mod
# GOPATH/src/empty where GOPATH itself is a symlink
env GOPATH=$WORK/gopathlink
cd $GOPATH/src/empty
go mod init
rm go.mod
cd $WORK/gopath/src/empty
go mod init
rm go.mod
# GOPATH/src/link where GOPATH and link are both symlinks
cd $GOPATH/src/link
go mod init
stderr link
rm go.mod
# Too hard: doesn't match unevaluated nor completely evaluated. (Only partially evaluated.)
# Whether this works depends on which OS we are running on.
# cd $WORK/gopath/src/link
# ! go mod init
-- $WORK/x/x.go --
package x // import "x"
-- $GOPATH/src/example.com/x/y/y.go --
package y
-- $GOPATH/src/example.com/x/y/z/z.go --
package z
-- $GOPATH/src/example.com/x/y/z/Godeps/Godeps.json --
{"ImportPath": "unexpected.com/z"}
-- $WORK/gomoddir/go.mod/README.txt --
../go.mod is a directory, not a file.
-- $WORK/gomoddir/p.go --
package p
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