Adding upstream version 1.16.10.upstream/1.16.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 390 insertions, 0 deletions

diff --git a/src/cmd/go/internal/clean/clean.go b/src/cmd/go/internal/clean/clean.go
new file mode 100644
index 0000000..b1d40fe
--- /dev/null
+++ b/src/cmd/go/internal/clean/clean.go
@@ -0,0 +1,390 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package clean implements the ``go clean'' command.
+package clean
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+
+	"cmd/go/internal/base"
+	"cmd/go/internal/cache"
+	"cmd/go/internal/cfg"
+	"cmd/go/internal/load"
+	"cmd/go/internal/lockedfile"
+	"cmd/go/internal/modfetch"
+	"cmd/go/internal/modload"
+	"cmd/go/internal/work"
+)
+
+var CmdClean = &base.Command{
+	UsageLine: "go clean [clean flags] [build flags] [packages]",
+	Short:     "remove object files and cached files",
+	Long: `
+Clean removes object files from package source directories.
+The go command builds most objects in a temporary directory,
+so go clean is mainly concerned with object files left by other
+tools or by manual invocations of go build.
+
+If a package argument is given or the -i or -r flag is set,
+clean removes the following files from each of the
+source directories corresponding to the import paths:
+
+	_obj/            old object directory, left from Makefiles
+	_test/           old test directory, left from Makefiles
+	_testmain.go     old gotest file, left from Makefiles
+	test.out         old test log, left from Makefiles
+	build.out        old test log, left from Makefiles
+	*.[568ao]        object files, left from Makefiles
+
+	DIR(.exe)        from go build
+	DIR.test(.exe)   from go test -c
+	MAINFILE(.exe)   from go build MAINFILE.go
+	*.so             from SWIG
+
+In the list, DIR represents the final path element of the
+directory, and MAINFILE is the base name of any Go source
+file in the directory that is not included when building
+the package.
+
+The -i flag causes clean to remove the corresponding installed
+archive or binary (what 'go install' would create).
+
+The -n flag causes clean to print the remove commands it would execute,
+but not run them.
+
+The -r flag causes clean to be applied recursively to all the
+dependencies of the packages named by the import paths.
+
+The -x flag causes clean to print remove commands as it executes them.
+
+The -cache flag causes clean to remove the entire go build cache.
+
+The -testcache flag causes clean to expire all test results in the
+go build cache.
+
+The -modcache flag causes clean to remove the entire module
+download cache, including unpacked source code of versioned
+dependencies.
+
+For more about build flags, see 'go help build'.
+
+For more about specifying packages, see 'go help packages'.
+	`,
+}
+
+var (
+	cleanI         bool // clean -i flag
+	cleanR         bool // clean -r flag
+	cleanCache     bool // clean -cache flag
+	cleanModcache  bool // clean -modcache flag
+	cleanTestcache bool // clean -testcache flag
+)
+
+func init() {
+	// break init cycle
+	CmdClean.Run = runClean
+
+	CmdClean.Flag.BoolVar(&cleanI, "i", false, "")
+	CmdClean.Flag.BoolVar(&cleanR, "r", false, "")
+	CmdClean.Flag.BoolVar(&cleanCache, "cache", false, "")
+	CmdClean.Flag.BoolVar(&cleanModcache, "modcache", false, "")
+	CmdClean.Flag.BoolVar(&cleanTestcache, "testcache", false, "")
+
+	// -n and -x are important enough to be
+	// mentioned explicitly in the docs but they
+	// are part of the build flags.
+
+	work.AddBuildFlags(CmdClean, work.DefaultBuildFlags)
+}
+
+func runClean(ctx context.Context, cmd *base.Command, args []string) {
+	// golang.org/issue/29925: only load packages before cleaning if
+	// either the flags and arguments explicitly imply a package,
+	// or no other target (such as a cache) was requested to be cleaned.
+	cleanPkg := len(args) > 0 || cleanI || cleanR
+	if (!modload.Enabled() || modload.HasModRoot()) &&
+		!cleanCache && !cleanModcache && !cleanTestcache {
+		cleanPkg = true
+	}
+
+	if cleanPkg {
+		for _, pkg := range load.PackagesAndErrors(ctx, args) {
+			clean(pkg)
+		}
+	}
+
+	var b work.Builder
+	b.Print = fmt.Print
+
+	if cleanCache {
+		dir := cache.DefaultDir()
+		if dir != "off" {
+			// Remove the cache subdirectories but not the top cache directory.
+			// The top cache directory may have been created with special permissions
+			// and not something that we want to remove. Also, we'd like to preserve
+			// the access log for future analysis, even if the cache is cleared.
+			subdirs, _ := filepath.Glob(filepath.Join(dir, "[0-9a-f][0-9a-f]"))
+			printedErrors := false
+			if len(subdirs) > 0 {
+				if cfg.BuildN || cfg.BuildX {
+					b.Showcmd("", "rm -r %s", strings.Join(subdirs, " "))
+				}
+				if !cfg.BuildN {
+					for _, d := range subdirs {
+						// Only print the first error - there may be many.
+						// This also mimics what os.RemoveAll(dir) would do.
+						if err := os.RemoveAll(d); err != nil && !printedErrors {
+							printedErrors = true
+							base.Errorf("go clean -cache: %v", err)
+						}
+					}
+				}
+			}
+
+			logFile := filepath.Join(dir, "log.txt")
+			if cfg.BuildN || cfg.BuildX {
+				b.Showcmd("", "rm -f %s", logFile)
+			}
+			if !cfg.BuildN {
+				if err := os.RemoveAll(logFile); err != nil && !printedErrors {
+					printedErrors = true
+					base.Errorf("go clean -cache: %v", err)
+				}
+			}
+		}
+	}
+
+	if cleanTestcache && !cleanCache {
+		// Instead of walking through the entire cache looking for test results,
+		// we write a file to the cache indicating that all test results from before
+		// right now are to be ignored.
+		dir := cache.DefaultDir()
+		if dir != "off" {
+			f, err := lockedfile.Edit(filepath.Join(dir, "testexpire.txt"))
+			if err == nil {
+				now := time.Now().UnixNano()
+				buf, _ := io.ReadAll(f)
+				prev, _ := strconv.ParseInt(strings.TrimSpace(string(buf)), 10, 64)
+				if now > prev {
+					if err = f.Truncate(0); err == nil {
+						if _, err = f.Seek(0, 0); err == nil {
+							_, err = fmt.Fprintf(f, "%d\n", now)
+						}
+					}
+				}
+				if closeErr := f.Close(); err == nil {
+					err = closeErr
+				}
+			}
+			if err != nil {
+				if _, statErr := os.Stat(dir); !os.IsNotExist(statErr) {
+					base.Errorf("go clean -testcache: %v", err)
+				}
+			}
+		}
+	}
+
+	if cleanModcache {
+		if cfg.GOMODCACHE == "" {
+			base.Fatalf("go clean -modcache: no module cache")
+		}
+		if cfg.BuildN || cfg.BuildX {
+			b.Showcmd("", "rm -rf %s", cfg.GOMODCACHE)
+		}
+		if !cfg.BuildN {
+			if err := modfetch.RemoveAll(cfg.GOMODCACHE); err != nil {
+				base.Errorf("go clean -modcache: %v", err)
+			}
+		}
+	}
+}
+
+var cleaned = map[*load.Package]bool{}
+
+// TODO: These are dregs left by Makefile-based builds.
+// Eventually, can stop deleting these.
+var cleanDir = map[string]bool{
+	"_test": true,
+	"_obj":  true,
+}
+
+var cleanFile = map[string]bool{
+	"_testmain.go": true,
+	"test.out":     true,
+	"build.out":    true,
+	"a.out":        true,
+}
+
+var cleanExt = map[string]bool{
+	".5":  true,
+	".6":  true,
+	".8":  true,
+	".a":  true,
+	".o":  true,
+	".so": true,
+}
+
+func clean(p *load.Package) {
+	if cleaned[p] {
+		return
+	}
+	cleaned[p] = true
+
+	if p.Dir == "" {
+		base.Errorf("%v", p.Error)
+		return
+	}
+	dirs, err := os.ReadDir(p.Dir)
+	if err != nil {
+		base.Errorf("go clean %s: %v", p.Dir, err)
+		return
+	}
+
+	var b work.Builder
+	b.Print = fmt.Print
+
+	packageFile := map[string]bool{}
+	if p.Name != "main" {
+		// Record which files are not in package main.
+		// The others are.
+		keep := func(list []string) {
+			for _, f := range list {
+				packageFile[f] = true
+			}
+		}
+		keep(p.GoFiles)
+		keep(p.CgoFiles)
+		keep(p.TestGoFiles)
+		keep(p.XTestGoFiles)
+	}
+
+	_, elem := filepath.Split(p.Dir)
+	var allRemove []string
+
+	// Remove dir-named executable only if this is package main.
+	if p.Name == "main" {
+		allRemove = append(allRemove,
+			elem,
+			elem+".exe",
+			p.DefaultExecName(),
+			p.DefaultExecName()+".exe",
+		)
+	}
+
+	// Remove package test executables.
+	allRemove = append(allRemove,
+		elem+".test",
+		elem+".test.exe",
+		p.DefaultExecName()+".test",
+		p.DefaultExecName()+".test.exe",
+	)
+
+	// Remove a potential executable, test executable for each .go file in the directory that
+	// is not part of the directory's package.
+	for _, dir := range dirs {
+		name := dir.Name()
+		if packageFile[name] {
+			continue
+		}
+
+		if dir.IsDir() {
+			continue
+		}
+
+		if strings.HasSuffix(name, "_test.go") {
+			base := name[:len(name)-len("_test.go")]
+			allRemove = append(allRemove, base+".test", base+".test.exe")
+		}
+
+		if strings.HasSuffix(name, ".go") {
+			// TODO(adg,rsc): check that this .go file is actually
+			// in "package main", and therefore capable of building
+			// to an executable file.
+			base := name[:len(name)-len(".go")]
+			allRemove = append(allRemove, base, base+".exe")
+		}
+	}
+
+	if cfg.BuildN || cfg.BuildX {
+		b.Showcmd(p.Dir, "rm -f %s", strings.Join(allRemove, " "))
+	}
+
+	toRemove := map[string]bool{}
+	for _, name := range allRemove {
+		toRemove[name] = true
+	}
+	for _, dir := range dirs {
+		name := dir.Name()
+		if dir.IsDir() {
+			// TODO: Remove once Makefiles are forgotten.
+			if cleanDir[name] {
+				if cfg.BuildN || cfg.BuildX {
+					b.Showcmd(p.Dir, "rm -r %s", name)
+					if cfg.BuildN {
+						continue
+					}
+				}
+				if err := os.RemoveAll(filepath.Join(p.Dir, name)); err != nil {
+					base.Errorf("go clean: %v", err)
+				}
+			}
+			continue
+		}
+
+		if cfg.BuildN {
+			continue
+		}
+
+		if cleanFile[name] || cleanExt[filepath.Ext(name)] || toRemove[name] {
+			removeFile(filepath.Join(p.Dir, name))
+		}
+	}
+
+	if cleanI && p.Target != "" {
+		if cfg.BuildN || cfg.BuildX {
+			b.Showcmd("", "rm -f %s", p.Target)
+		}
+		if !cfg.BuildN {
+			removeFile(p.Target)
+		}
+	}
+
+	if cleanR {
+		for _, p1 := range p.Internal.Imports {
+			clean(p1)
+		}
+	}
+}
+
+// removeFile tries to remove file f, if error other than file doesn't exist
+// occurs, it will report the error.
+func removeFile(f string) {
+	err := os.Remove(f)
+	if err == nil || os.IsNotExist(err) {
+		return
+	}
+	// Windows does not allow deletion of a binary file while it is executing.
+	if base.ToolIsWindows {
+		// Remove lingering ~ file from last attempt.
+		if _, err2 := os.Stat(f + "~"); err2 == nil {
+			os.Remove(f + "~")
+		}
+		// Try to move it out of the way. If the move fails,
+		// which is likely, we'll try again the
+		// next time we do an install of this binary.
+		if err2 := os.Rename(f, f+"~"); err2 == nil {
+			os.Remove(f + "~")
+			return
+		}
+	}
+	base.Errorf("go clean: %v", err)
+}