mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-22 21:14:18 -04:00
241 lines
6.9 KiB
Go
Vendored
241 lines
6.9 KiB
Go
Vendored
// Copyright ©2015 The Go Authors
|
|
// Copyright ©2015 Steve Francia <spf@spf13.com>
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package afero
|
|
|
|
import (
|
|
"bytes"
|
|
"io"
|
|
"os"
|
|
"path/filepath"
|
|
"sort"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
// byName implements sort.Interface.
|
|
type byName []os.FileInfo
|
|
|
|
func (f byName) Len() int { return len(f) }
|
|
func (f byName) Less(i, j int) bool { return f[i].Name() < f[j].Name() }
|
|
func (f byName) Swap(i, j int) { f[i], f[j] = f[j], f[i] }
|
|
|
|
// ReadDir reads the directory named by dirname and returns
|
|
// a list of sorted directory entries.
|
|
func (a Afero) ReadDir(dirname string) ([]os.FileInfo, error) {
|
|
return ReadDir(a.Fs, dirname)
|
|
}
|
|
|
|
func ReadDir(fs Fs, dirname string) ([]os.FileInfo, error) {
|
|
f, err := fs.Open(dirname)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
list, err := f.Readdir(-1)
|
|
f.Close()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
sort.Sort(byName(list))
|
|
return list, nil
|
|
}
|
|
|
|
// ReadFile reads the file named by filename and returns the contents.
|
|
// A successful call returns err == nil, not err == EOF. Because ReadFile
|
|
// reads the whole file, it does not treat an EOF from Read as an error
|
|
// to be reported.
|
|
func (a Afero) ReadFile(filename string) ([]byte, error) {
|
|
return ReadFile(a.Fs, filename)
|
|
}
|
|
|
|
func ReadFile(fs Fs, filename string) ([]byte, error) {
|
|
f, err := fs.Open(filename)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
// It's a good but not certain bet that FileInfo will tell us exactly how much to
|
|
// read, so let's try it but be prepared for the answer to be wrong.
|
|
var n int64
|
|
|
|
if fi, err := f.Stat(); err == nil {
|
|
// Don't preallocate a huge buffer, just in case.
|
|
if size := fi.Size(); size < 1e9 {
|
|
n = size
|
|
}
|
|
}
|
|
// As initial capacity for readAll, use n + a little extra in case Size is zero,
|
|
// and to avoid another allocation after Read has filled the buffer. The readAll
|
|
// call will read into its allocated internal buffer cheaply. If the size was
|
|
// wrong, we'll either waste some space off the end or reallocate as needed, but
|
|
// in the overwhelmingly common case we'll get it just right.
|
|
return readAll(f, n+bytes.MinRead)
|
|
}
|
|
|
|
// readAll reads from r until an error or EOF and returns the data it read
|
|
// from the internal buffer allocated with a specified capacity.
|
|
func readAll(r io.Reader, capacity int64) (b []byte, err error) {
|
|
buf := bytes.NewBuffer(make([]byte, 0, capacity))
|
|
// If the buffer overflows, we will get bytes.ErrTooLarge.
|
|
// Return that as an error. Any other panic remains.
|
|
defer func() {
|
|
e := recover()
|
|
if e == nil {
|
|
return
|
|
}
|
|
if panicErr, ok := e.(error); ok && panicErr == bytes.ErrTooLarge {
|
|
err = panicErr
|
|
} else {
|
|
panic(e)
|
|
}
|
|
}()
|
|
_, err = buf.ReadFrom(r)
|
|
return buf.Bytes(), err
|
|
}
|
|
|
|
// ReadAll reads from r until an error or EOF and returns the data it read.
|
|
// A successful call returns err == nil, not err == EOF. Because ReadAll is
|
|
// defined to read from src until EOF, it does not treat an EOF from Read
|
|
// as an error to be reported.
|
|
func ReadAll(r io.Reader) ([]byte, error) {
|
|
return readAll(r, bytes.MinRead)
|
|
}
|
|
|
|
// WriteFile writes data to a file named by filename.
|
|
// If the file does not exist, WriteFile creates it with permissions perm;
|
|
// otherwise WriteFile truncates it before writing.
|
|
func (a Afero) WriteFile(filename string, data []byte, perm os.FileMode) error {
|
|
return WriteFile(a.Fs, filename, data, perm)
|
|
}
|
|
|
|
func WriteFile(fs Fs, filename string, data []byte, perm os.FileMode) error {
|
|
f, err := fs.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
n, err := f.Write(data)
|
|
if err == nil && n < len(data) {
|
|
err = io.ErrShortWrite
|
|
}
|
|
if err1 := f.Close(); err == nil {
|
|
err = err1
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Random number state.
|
|
// We generate random temporary file names so that there's a good
|
|
// chance the file doesn't exist yet - keeps the number of tries in
|
|
// TempFile to a minimum.
|
|
var rand uint32
|
|
var randmu sync.Mutex
|
|
|
|
func reseed() uint32 {
|
|
return uint32(time.Now().UnixNano() + int64(os.Getpid()))
|
|
}
|
|
|
|
func nextRandom() string {
|
|
randmu.Lock()
|
|
r := rand
|
|
if r == 0 {
|
|
r = reseed()
|
|
}
|
|
r = r*1664525 + 1013904223 // constants from Numerical Recipes
|
|
rand = r
|
|
randmu.Unlock()
|
|
return strconv.Itoa(int(1e9 + r%1e9))[1:]
|
|
}
|
|
|
|
// TempFile creates a new temporary file in the directory dir,
|
|
// opens the file for reading and writing, and returns the resulting *os.File.
|
|
// The filename is generated by taking pattern and adding a random
|
|
// string to the end. If pattern includes a "*", the random string
|
|
// replaces the last "*".
|
|
// If dir is the empty string, TempFile uses the default directory
|
|
// for temporary files (see os.TempDir).
|
|
// Multiple programs calling TempFile simultaneously
|
|
// will not choose the same file. The caller can use f.Name()
|
|
// to find the pathname of the file. It is the caller's responsibility
|
|
// to remove the file when no longer needed.
|
|
func (a Afero) TempFile(dir, pattern string) (f File, err error) {
|
|
return TempFile(a.Fs, dir, pattern)
|
|
}
|
|
|
|
func TempFile(fs Fs, dir, pattern string) (f File, err error) {
|
|
if dir == "" {
|
|
dir = os.TempDir()
|
|
}
|
|
|
|
var prefix, suffix string
|
|
if pos := strings.LastIndex(pattern, "*"); pos != -1 {
|
|
prefix, suffix = pattern[:pos], pattern[pos+1:]
|
|
} else {
|
|
prefix = pattern
|
|
}
|
|
|
|
nconflict := 0
|
|
for i := 0; i < 10000; i++ {
|
|
name := filepath.Join(dir, prefix+nextRandom()+suffix)
|
|
f, err = fs.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
|
|
if os.IsExist(err) {
|
|
if nconflict++; nconflict > 10 {
|
|
randmu.Lock()
|
|
rand = reseed()
|
|
randmu.Unlock()
|
|
}
|
|
continue
|
|
}
|
|
break
|
|
}
|
|
return
|
|
}
|
|
|
|
// TempDir creates a new temporary directory in the directory dir
|
|
// with a name beginning with prefix and returns the path of the
|
|
// new directory. If dir is the empty string, TempDir uses the
|
|
// default directory for temporary files (see os.TempDir).
|
|
// Multiple programs calling TempDir simultaneously
|
|
// will not choose the same directory. It is the caller's responsibility
|
|
// to remove the directory when no longer needed.
|
|
func (a Afero) TempDir(dir, prefix string) (name string, err error) {
|
|
return TempDir(a.Fs, dir, prefix)
|
|
}
|
|
func TempDir(fs Fs, dir, prefix string) (name string, err error) {
|
|
if dir == "" {
|
|
dir = os.TempDir()
|
|
}
|
|
|
|
nconflict := 0
|
|
for i := 0; i < 10000; i++ {
|
|
try := filepath.Join(dir, prefix+nextRandom())
|
|
err = fs.Mkdir(try, 0700)
|
|
if os.IsExist(err) {
|
|
if nconflict++; nconflict > 10 {
|
|
randmu.Lock()
|
|
rand = reseed()
|
|
randmu.Unlock()
|
|
}
|
|
continue
|
|
}
|
|
if err == nil {
|
|
name = try
|
|
}
|
|
break
|
|
}
|
|
return
|
|
}
|