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moby--moby/pkg/fileutils/fileutils.go
Antonio Murdaca c30a55f14d Refactor utils/utils, fixes #11923
Signed-off-by: Antonio Murdaca <me@runcom.ninja>
2015-04-14 01:37:36 +02:00

81 lines
2 KiB
Go

package fileutils
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/Sirupsen/logrus"
)
// Matches returns true if relFilePath matches any of the patterns
func Matches(relFilePath string, patterns []string) (bool, error) {
for _, exclude := range patterns {
matched, err := filepath.Match(exclude, relFilePath)
if err != nil {
logrus.Errorf("Error matching: %s (pattern: %s)", relFilePath, exclude)
return false, err
}
if matched {
if filepath.Clean(relFilePath) == "." {
logrus.Errorf("Can't exclude whole path, excluding pattern: %s", exclude)
continue
}
logrus.Debugf("Skipping excluded path: %s", relFilePath)
return true, nil
}
}
return false, nil
}
func CopyFile(src, dst string) (int64, error) {
if src == dst {
return 0, nil
}
sf, err := os.Open(src)
if err != nil {
return 0, err
}
defer sf.Close()
if err := os.Remove(dst); err != nil && !os.IsNotExist(err) {
return 0, err
}
df, err := os.Create(dst)
if err != nil {
return 0, err
}
defer df.Close()
return io.Copy(df, sf)
}
func GetTotalUsedFds() int {
if fds, err := ioutil.ReadDir(fmt.Sprintf("/proc/%d/fd", os.Getpid())); err != nil {
logrus.Errorf("Error opening /proc/%d/fd: %s", os.Getpid(), err)
} else {
return len(fds)
}
return -1
}
// ReadSymlinkedDirectory returns the target directory of a symlink.
// The target of the symbolic link may not be a file.
func ReadSymlinkedDirectory(path string) (string, error) {
var realPath string
var err error
if realPath, err = filepath.Abs(path); err != nil {
return "", fmt.Errorf("unable to get absolute path for %s: %s", path, err)
}
if realPath, err = filepath.EvalSymlinks(realPath); err != nil {
return "", fmt.Errorf("failed to canonicalise path for %s: %s", path, err)
}
realPathInfo, err := os.Stat(realPath)
if err != nil {
return "", fmt.Errorf("failed to stat target '%s' of '%s': %s", realPath, path, err)
}
if !realPathInfo.Mode().IsDir() {
return "", fmt.Errorf("canonical path points to a file '%s'", realPath)
}
return realPath, nil
}