4e8e71e4e2
This is not yet working, it's just a direct copy of the Manager of Flamenco 2, with Logrus replaced by Zerolog. The API has been documented in flamenco-manager.yaml as a starting point for the integration.
90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This is a copy of `tempfile.go` from the Go 1.14 standard library.
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// It has been modified to make TempFile() respect the process' umask
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// instead of creating files with 0600 permissions. This is used to
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// ensure files uploaded to Shaman storage will be usable by other
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// processes (like Flamenco Worker running as a different user).
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package filestore
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import (
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"time"
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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 nextRandom() 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,
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// opens the file for reading and writing, and returns the resulting *os.File.
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// The filename is generated by taking pattern and adding a random
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// string to the end. If pattern includes a "*", the random string
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// replaces the last "*".
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// If dir is the empty string, TempFile uses the default directory
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// for temporary files (see os.TempDir).
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// Multiple programs calling TempFile simultaneously
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// will not choose the same file. The caller can use f.Name()
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// 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(dir, pattern string) (f *os.File, err error) {
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if dir == "" {
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dir = os.TempDir()
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}
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prefix, suffix := prefixAndSuffix(pattern)
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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+nextRandom()+suffix)
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f, err = os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666) // Changed from 0600 in the standard Go code.
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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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// prefixAndSuffix splits pattern by the last wildcard "*", if applicable,
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// returning prefix as the part before "*" and suffix as the part after "*".
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func prefixAndSuffix(pattern string) (prefix, suffix string) {
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if pos := strings.LastIndex(pattern, "*"); pos != -1 {
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prefix, suffix = pattern[:pos], pattern[pos+1:]
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} else {
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prefix = pattern
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}
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return
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}
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