cmd/go: fix windows test failures

search.CleanPatterns now preserves backslash separators in absolute
paths in Windows. These had resulted in inconsistent error messages.

search.MatchPackagesInFS is now more accepting of patterns with
backslashes. It was inconsistent before.

Several tests are fixed to work with Windows (mostly to match slashes
or backslashes).

Fixes #25300

Change-Id: Ibbf9ccd145353f7e3d345205c6fcc01d7066d1c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/206144
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

src/cmd/go/internal/modfetch/codehost/git_test.go

@@ -78,7 +78,16 @@ func testMain(m *testing.M) int {
 
 func testRepo(remote string) (Repo, error) {
 	if remote == "localGitRepo" {
-		return LocalGitRepo(filepath.ToSlash(localGitRepo))
+		// Convert absolute path to file URL. LocalGitRepo will not accept
+		// Windows absolute paths because they look like a host:path remote.
+		// TODO(golang.org/issue/32456): use url.FromFilePath when implemented.
+		var url string
+		if strings.HasPrefix(localGitRepo, "/") {
+			url = "file://" + localGitRepo
+		} else {
+			url = "file:///" + filepath.ToSlash(localGitRepo)
+		}
+		return LocalGitRepo(url)
 	}
 	kind := "git"
 	for _, k := range []string{"hg"} {

src/cmd/go/internal/search/search.go

@@ -125,32 +125,43 @@ func SetModRoot(dir string) {
 	modRoot = dir
 }
 
-// MatchPackagesInFS is like allPackages but is passed a pattern
-// beginning ./ or ../, meaning it should scan the tree rooted
-// at the given directory. There are ... in the pattern too.
-// (See go help packages for pattern syntax.)
+// MatchPackagesInFS is like MatchPackages but is passed a pattern that
+// begins with an absolute path or "./" or "../". On Windows, the pattern may
+// use slash or backslash separators or a mix of both.
+//
+// MatchPackagesInFS scans the tree rooted at the directory that contains the
+// first "..." wildcard and returns a match with packages that
 func MatchPackagesInFS(pattern string) *Match {
 	m := &Match{
 		Pattern: pattern,
 		Literal: false,
 	}
 
+	// Clean the path and create a matching predicate.
+	// filepath.Clean removes "./" prefixes (and ".\" on Windows). We need to
+	// preserve these, since they are meaningful in MatchPattern and in
+	// returned import paths.
+	cleanPattern := filepath.Clean(pattern)
+	isLocal := strings.HasPrefix(pattern, "./") || (os.PathSeparator == '\\' && strings.HasPrefix(pattern, `.\`))
+	prefix := ""
+	if cleanPattern != "." && isLocal {
+		prefix = "./"
+		cleanPattern = "." + string(os.PathSeparator) + cleanPattern
+	}
+	slashPattern := filepath.ToSlash(cleanPattern)
+	match := MatchPattern(slashPattern)
+
 	// Find directory to begin the scan.
 	// Could be smarter but this one optimization
 	// is enough for now, since ... is usually at the
 	// end of a path.
-	i := strings.Index(pattern, "...")
-	dir, _ := path.Split(pattern[:i])
+	i := strings.Index(cleanPattern, "...")
+	dir, _ := filepath.Split(cleanPattern[:i])
 
 	// pattern begins with ./ or ../.
 	// path.Clean will discard the ./ but not the ../.
 	// We need to preserve the ./ for pattern matching
 	// and in the returned import paths.
-	prefix := ""
-	if strings.HasPrefix(pattern, "./") {
-		prefix = "./"
-	}
-	match := MatchPattern(pattern)
 
 	if modRoot != "" {
 		abs, err := filepath.Abs(dir)
@@ -381,9 +392,13 @@ func CleanPatterns(patterns []string) []string {
 			v = a[i:]
 		}
 
-		// Arguments are supposed to be import paths, but
-		// as a courtesy to Windows developers, rewrite \ to /
-		// in command-line arguments. Handles .\... and so on.
+		// Arguments may be either file paths or import paths.
+		// As a courtesy to Windows developers, rewrite \ to /
+		// in arguments that look like import paths.
+		// Don't replace slashes in absolute paths.
+		if filepath.IsAbs(p) {
+			p = filepath.Clean(p)
+		} else {
 			if filepath.Separator == '\\' {
 				p = strings.ReplaceAll(p, `\`, `/`)
 			}
@@ -397,6 +412,7 @@ func CleanPatterns(patterns []string) []string {
 			} else {
 				p = path.Clean(p)
 			}
+		}
 
 		out = append(out, p+v)
 	}

src/cmd/go/testdata/script/build_trimpath.txt

 [short] skip
-
-env -r GOROOT_REGEXP=$GOROOT
-env -r WORK_REGEXP='$WORK'  # don't expand $WORK; grep replaces $WORK in text before matching.
-env GOROOT GOROOT_REGEXP WORK WORK_REGEXP
+env GO111MODULE=on
 
 # A binary built without -trimpath should contain the current workspace
 # and GOROOT for debugging and stack traces.
 cd a
-go build -o hello.exe hello.go
-grep -q $WORK_REGEXP hello.exe
-grep -q $GOROOT_REGEXP hello.exe
+go build -o $WORK/paths-a.exe paths.go
+exec $WORK/paths-a.exe $WORK/paths-a.exe
+stdout 'binary contains GOPATH: true'
+stdout 'binary contains GOROOT: true'
 
 # A binary built with -trimpath should not contain the current workspace
 # or GOROOT.
-go build -trimpath -o hello.exe hello.go
-! grep -q $GOROOT_REGEXP hello.exe
-! grep -q $WORK_REGEXP hello.exe
+go build -trimpath -o $WORK/paths-a.exe paths.go
+exec $WORK/paths-a.exe $WORK/paths-a.exe
+stdout 'binary contains GOPATH: false'
+stdout 'binary contains GOROOT: false'
 
 # A binary from an external module built with -trimpath should not contain
 # the current workspace or GOROOT.
 cd $WORK
-env GO111MODULE=on
 go get -trimpath rsc.io/fortune
-! grep -q $GOROOT_REGEXP $GOPATH/bin/fortune$GOEXE
-! grep -q $WORK_REGEXP $GOPATH/bin/fortune$GOEXE
+exec $WORK/paths-a.exe $GOPATH/bin/fortune$GOEXE
+stdout 'binary contains GOPATH: false'
+stdout 'binary contains GOROOT: false'
 
 # Two binaries built from identical packages in different directories
 # should be identical.
-cd $GOPATH/src/a
-go build -trimpath -o $WORK/a-GOPATH.exe .
-cd $WORK/_alt/src/a
-go build -trimpath -o $WORK/a-alt.exe .
-cmp -q $WORK/a-GOPATH.exe $WORK/a-alt.exe
+# TODO(golang.org/issue/35435): at the moment, they are not.
+#mkdir $GOPATH/src/b
+#cp $GOPATH/src/a/go.mod $GOPATH/src/b/go.mod
+#cp $GOPATH/src/a/paths.go $GOPATH/src/b/paths.go
+#cd $GOPATH/src/b
+#go build -trimpath -o $WORK/paths-b.exe .
+#cmp -q $WORK/paths-a.exe $WORK/paths-b.exe
 
 [!exec:gccgo] stop
 
-# Binaries built using gccgo should also be identical to each other.
+# A binary built with gccgo without -trimpath should contain the current
+# GOPATH and GOROOT.
 env GO111MODULE=off # The current released gccgo does not support builds in module mode.
 cd $GOPATH/src/a
-go build -compiler=gccgo -trimpath -o $WORK/gccgo-GOPATH.exe .
+go build -compiler=gccgo -o $WORK/gccgo-paths-a.exe .
+exec $WORK/gccgo-paths-a.exe $WORK/gccgo-paths-b.exe
+stdout 'binary contains GOPATH: true'
+stdout 'binary contains GOROOT: true'
 
-env old_gopath=$GOPATH
-env GOPATH=$WORK/_alt
-cd $WORK/_alt/src/a
-go build -compiler=gccgo -trimpath -o $WORK/gccgo-alt.exe .
-cd $WORK
-! grep -q $GOROOT_REGEXP gccgo-GOPATH.exe
-! grep -q $WORK_REGEXP gccgo-GOPATH.exe
-cmp -q gccgo-GOPATH.exe gccgo-alt.exe
+# A binary built with gccgo with -trimpath should not contain GOPATH or GOROOT.
+go build -compiler=gccgo -trimpath -o $WORK/gccgo-paths-a.exe .
+exec $WORK/gccgo-paths-a.exe $WORK/gccgo-paths-b.exe
+stdout 'binary contains GOPATH: false'
+stdout 'binary contains GOROOT: false'
+
+# Two binaries built from identical packages in different directories
+# should be identical.
+# TODO(golang.org/issue/35435): at the moment, they are not.
+#cd ../b
+#go build -compiler=gccgo -trimpath -o $WORK/gccgo-paths-b.exe .
+#cmp -q $WORK/gccgo-paths-a.exe $WORK/gccgo-paths-b.exe
 
--- $GOPATH/src/a/hello.go --
+-- $GOPATH/src/a/paths.go --
 package main
-func main() { println("hello") }
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	exe := os.Args[1]
+	data, err := ioutil.ReadFile(exe)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	gopath := []byte(filepath.ToSlash(os.Getenv("GOPATH")))
+	if len(gopath) == 0 {
+		log.Fatal("GOPATH not set")
+	}
+	fmt.Printf("binary contains GOPATH: %v\n", bytes.Contains(data, gopath))
+
+	goroot := []byte(filepath.ToSlash(os.Getenv("GOROOT")))
+	if len(goroot) == 0 {
+		log.Fatal("GOROOT not set")
+	}
+	fmt.Printf("binary contains GOROOT: %v\n", bytes.Contains(data, goroot))
+}
 -- $GOPATH/src/a/go.mod --
 module example.com/a
--- $WORK/_alt/src/a/hello.go --
-package main
-func main() { println("hello") }
--- $WORK/_alt/src/a/go.mod --
-module example.com/a

src/cmd/go/testdata/script/mod_getx.txt

 [short] skip
 [!net] skip
+[!exec:git] skip
 
 env GO111MODULE=on
 env GOPROXY=direct

src/cmd/go/testdata/script/mod_list_dir.txt

@@ -12,10 +12,10 @@ stdout ^math$
 go list -f '{{.ImportPath}}' .
 stdout ^x$
 ! go list -f '{{.ImportPath}}' $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
-stderr '^can.t load package: package '$WORK'[/\\]gopath/pkg/mod/rsc.io/quote@v1.5.2: can only use path@version syntax with .go get.'
+stderr '^can.t load package: package '$WORK'[/\\]gopath[/\\]pkg[/\\]mod[/\\]rsc.io[/\\]quote@v1.5.2: can only use path@version syntax with .go get.'
 
 go list -e -f '{{with .Error}}{{.}}{{end}}' $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
-stdout '^package '$WORK'[/\\]gopath/pkg/mod/rsc.io/quote@v1.5.2: can only use path@version syntax with .go get.'
+stdout '^package '$WORK'[/\\]gopath[/\\]pkg[/\\]mod[/\\]rsc.io[/\\]quote@v1.5.2: can only use path@version syntax with .go get.'
 go mod download rsc.io/quote@v1.5.2
 go list -f '{{.ImportPath}}' $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
 stdout '^rsc.io/quote$'

src/cmd/go/testdata/script/mod_prefer_compatible.txt

@@ -34,6 +34,7 @@ stdout '^github.com/russross/blackfriday v1\.'
 # order to determine whether it contains a go.mod file, and part of the point of
 # the proxy is to avoid fetching unnecessary data.)
 
+[!exec:git] stop
 env GOPROXY=direct
 
 go list -versions -m github.com/russross/blackfriday github.com/russross/blackfriday

src/cmd/go/testdata/script/mod_sumdb_file_path.txt

@@ -13,7 +13,7 @@ env GOPATH=$WORK/gopath1
 [windows] env GOPROXY=file:///$WORK/sumproxy,https://proxy.golang.org
 [!windows] env GOPROXY=file://$WORK/sumproxy,https://proxy.golang.org
 ! go get -d golang.org/x/text@v0.3.2
-stderr '^go get golang.org/x/text@v0.3.2: golang.org/x/text@v0.3.2: verifying module: golang.org/x/text@v0.3.2: reading file://.*/sumdb/sum.golang.org/lookup/golang.org/x/text@v0.3.2: (no such file or directory|.*cannot find the file specified.*)'
+stderr '^go get golang.org/x/text@v0.3.2: golang.org/x/text@v0.3.2: verifying module: golang.org/x/text@v0.3.2: reading file://.*/sumdb/sum.golang.org/lookup/golang.org/x/text@v0.3.2: (no such file or directory|.*cannot find the path specified.*)'
 
 # If the proxy does not claim to support the database,
 # checksum verification should fall through to the next proxy,

src/cmd/go/testdata/script/mod_vendor_auto.txt

@@ -62,7 +62,7 @@ stdout '^'$WORK'[/\\]auto[/\\]replacement-version$'
 go mod edit -go=1.14
 
 ! go list -f {{.Dir}} -tags tools all
-stderr '^go: inconsistent vendoring in '$WORK/auto':$'
+stderr '^go: inconsistent vendoring in '$WORK[/\\]auto':$'
 stderr '^\texample.com/printversion@v1.0.0: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt'
 stderr '^\texample.com/unused: is replaced in go.mod, but not marked as replaced in vendor/modules.txt'
 stderr '^\texample.com/version@v1.2.0: is replaced in go.mod, but not marked as replaced in vendor/modules.txt'
@@ -131,7 +131,7 @@ stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]version$'
 cp go.mod.orig go.mod
 go mod edit -go=1.14
 ! go list -f {{.Dir}} -tags tools all
-stderr '^go: inconsistent vendoring in '$WORK/auto':$'
+stderr '^go: inconsistent vendoring in '$WORK[/\\]auto':$'
 stderr '^\texample.com/printversion@v1.0.0: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt'
 stderr '^\texample.com/unused: is replaced in go.mod, but not marked as replaced in vendor/modules.txt'
 stderr '^\texample.com/version@v1.2.0: is replaced in go.mod, but not marked as replaced in vendor/modules.txt'
@@ -149,7 +149,7 @@ stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]version$'
 # ...but a version mismatch for an explicit dependency should be noticed.
 cp $WORK/modules-bad-1.13.txt vendor/modules.txt
 ! go list -mod=vendor -f {{.Dir}} -tags tools all
-stderr '^go: inconsistent vendoring in '$WORK/auto':$'
+stderr '^go: inconsistent vendoring in '$WORK[/\\]auto':$'
 stderr '^\texample.com/printversion@v1.0.0: is explicitly required in go.mod, but vendor/modules.txt indicates example.com/printversion@v1.1.0$'
 stderr '\n\nrun .go mod vendor. to sync, or use -mod=mod or -mod=readonly to ignore the vendor directory$'
 

src/cmd/go/testdata/script/version.txt

 env GO111MODULE=on
 [short] skip
 
+# Check that 'go version' and 'go version -m' work on a binary built in module mode.
 go build -o fortune.exe rsc.io/fortune
 go version fortune.exe
 stdout '^fortune.exe: .+'
@@ -8,6 +9,10 @@ go version -m fortune.exe
 stdout '^\tpath\trsc.io/fortune'
 stdout '^\tmod\trsc.io/fortune\tv1.0.0'
 
+# Repeat the test with -buildmode=pie.
+# TODO(golang.org/issue/27144): don't skip after -buildmode=pie is implemented
+# on Windows.
+[windows] skip # -buildmode=pie not supported
 go build -buildmode=pie -o external.exe rsc.io/fortune
 go version external.exe
 stdout '^external.exe: .+'