forked from toolshed/abra
chore: vendor
This commit is contained in:
282
vendor/github.com/go-git/go-billy/v5/util/util.go
generated
vendored
Normal file
282
vendor/github.com/go-git/go-billy/v5/util/util.go
generated
vendored
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@ -0,0 +1,282 @@
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package util
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import (
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"io"
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"os"
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"path/filepath"
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"strconv"
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"sync"
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"time"
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"github.com/go-git/go-billy/v5"
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)
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// RemoveAll removes path and any children it contains. It removes everything it
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// can but returns the first error it encounters. If the path does not exist,
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// RemoveAll returns nil (no error).
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func RemoveAll(fs billy.Basic, path string) error {
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fs, path = getUnderlyingAndPath(fs, path)
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if r, ok := fs.(removerAll); ok {
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return r.RemoveAll(path)
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}
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return removeAll(fs, path)
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}
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type removerAll interface {
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RemoveAll(string) error
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}
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func removeAll(fs billy.Basic, path string) error {
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// This implementation is adapted from os.RemoveAll.
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// Simple case: if Remove works, we're done.
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err := fs.Remove(path)
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if err == nil || os.IsNotExist(err) {
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return nil
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}
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// Otherwise, is this a directory we need to recurse into?
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dir, serr := fs.Stat(path)
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if serr != nil {
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if os.IsNotExist(serr) {
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return nil
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}
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return serr
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}
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if !dir.IsDir() {
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// Not a directory; return the error from Remove.
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return err
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}
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dirfs, ok := fs.(billy.Dir)
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if !ok {
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return billy.ErrNotSupported
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}
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// Directory.
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fis, err := dirfs.ReadDir(path)
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if err != nil {
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if os.IsNotExist(err) {
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// Race. It was deleted between the Lstat and Open.
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// Return nil per RemoveAll's docs.
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return nil
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}
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return err
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}
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// Remove contents & return first error.
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err = nil
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for _, fi := range fis {
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cpath := fs.Join(path, fi.Name())
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err1 := removeAll(fs, cpath)
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if err == nil {
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err = err1
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}
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}
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// Remove directory.
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err1 := fs.Remove(path)
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if err1 == nil || os.IsNotExist(err1) {
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return nil
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}
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if err == nil {
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err = err1
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}
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return err
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}
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// WriteFile writes data to a file named by filename in the given filesystem.
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// If the file does not exist, WriteFile creates it with permissions perm;
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// otherwise WriteFile truncates it before writing.
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func WriteFile(fs billy.Basic, filename string, data []byte, perm os.FileMode) error {
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f, err := fs.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
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if err != nil {
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return err
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}
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n, err := f.Write(data)
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if err == nil && n < len(data) {
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err = io.ErrShortWrite
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}
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if err1 := f.Close(); err == nil {
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err = err1
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}
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return err
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}
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// Random number state.
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// We generate random temporary file names so that there's a good
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// chance the file doesn't exist yet - keeps the number of tries in
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// TempFile to a minimum.
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var rand uint32
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var randmu sync.Mutex
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func reseed() uint32 {
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return uint32(time.Now().UnixNano() + int64(os.Getpid()))
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}
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func nextSuffix() string {
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randmu.Lock()
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r := rand
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if r == 0 {
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r = reseed()
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}
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r = r*1664525 + 1013904223 // constants from Numerical Recipes
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rand = r
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randmu.Unlock()
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return strconv.Itoa(int(1e9 + r%1e9))[1:]
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}
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// TempFile creates a new temporary file in the directory dir with a name
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// beginning with prefix, opens the file for reading and writing, and returns
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// the resulting *os.File. If dir is the empty string, TempFile uses the default
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// directory for temporary files (see os.TempDir). Multiple programs calling
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// TempFile simultaneously will not choose the same file. The caller can use
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// f.Name() to find the pathname of the file. It is the caller's responsibility
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// to remove the file when no longer needed.
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func TempFile(fs billy.Basic, dir, prefix string) (f billy.File, err error) {
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// This implementation is based on stdlib ioutil.TempFile.
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if dir == "" {
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dir = getTempDir(fs)
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}
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nconflict := 0
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for i := 0; i < 10000; i++ {
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name := filepath.Join(dir, prefix+nextSuffix())
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f, err = fs.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
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if os.IsExist(err) {
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if nconflict++; nconflict > 10 {
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randmu.Lock()
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rand = reseed()
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randmu.Unlock()
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}
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continue
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}
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break
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}
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return
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}
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// TempDir creates a new temporary directory in the directory dir
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// with a name beginning with prefix and returns the path of the
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// new directory. If dir is the empty string, TempDir uses the
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// default directory for temporary files (see os.TempDir).
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// Multiple programs calling TempDir simultaneously
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// will not choose the same directory. It is the caller's responsibility
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// to remove the directory when no longer needed.
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func TempDir(fs billy.Dir, dir, prefix string) (name string, err error) {
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// This implementation is based on stdlib ioutil.TempDir
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if dir == "" {
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dir = getTempDir(fs.(billy.Basic))
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}
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nconflict := 0
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for i := 0; i < 10000; i++ {
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try := filepath.Join(dir, prefix+nextSuffix())
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err = fs.MkdirAll(try, 0700)
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if os.IsExist(err) {
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if nconflict++; nconflict > 10 {
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randmu.Lock()
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rand = reseed()
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randmu.Unlock()
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}
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continue
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}
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if os.IsNotExist(err) {
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if _, err := os.Stat(dir); os.IsNotExist(err) {
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return "", err
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}
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}
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if err == nil {
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name = try
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}
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break
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}
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return
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}
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func getTempDir(fs billy.Basic) string {
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ch, ok := fs.(billy.Chroot)
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if !ok || ch.Root() == "" || ch.Root() == "/" || ch.Root() == string(filepath.Separator) {
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return os.TempDir()
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}
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return ".tmp"
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}
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type underlying interface {
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Underlying() billy.Basic
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}
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func getUnderlyingAndPath(fs billy.Basic, path string) (billy.Basic, string) {
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u, ok := fs.(underlying)
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if !ok {
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return fs, path
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}
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if ch, ok := fs.(billy.Chroot); ok {
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path = fs.Join(ch.Root(), path)
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}
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return u.Underlying(), path
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}
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// ReadFile reads the named file and returns the contents from the given filesystem.
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// A successful call returns err == nil, not err == EOF.
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// Because ReadFile reads the whole file, it does not treat an EOF from Read
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// as an error to be reported.
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func ReadFile(fs billy.Basic, name string) ([]byte, error) {
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f, err := fs.Open(name)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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var size int
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if info, err := fs.Stat(name); err == nil {
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size64 := info.Size()
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if int64(int(size64)) == size64 {
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size = int(size64)
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}
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}
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size++ // one byte for final read at EOF
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// If a file claims a small size, read at least 512 bytes.
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// In particular, files in Linux's /proc claim size 0 but
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// then do not work right if read in small pieces,
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// so an initial read of 1 byte would not work correctly.
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if size < 512 {
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size = 512
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}
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data := make([]byte, 0, size)
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for {
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if len(data) >= cap(data) {
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d := append(data[:cap(data)], 0)
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data = d[:len(data)]
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}
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n, err := f.Read(data[len(data):cap(data)])
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data = data[:len(data)+n]
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if err != nil {
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if err == io.EOF {
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err = nil
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}
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return data, err
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}
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}
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}
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