From 8c12c6939aab9106db14ec2d11d983bc5b29fb2c Mon Sep 17 00:00:00 2001 From: Niall Sheridan Date: Sun, 7 Jul 2019 21:33:44 +0100 Subject: Switch to modules --- vendor/github.com/spf13/afero/unionFile.go | 305 ----------------------------- 1 file changed, 305 deletions(-) delete mode 100644 vendor/github.com/spf13/afero/unionFile.go (limited to 'vendor/github.com/spf13/afero/unionFile.go') diff --git a/vendor/github.com/spf13/afero/unionFile.go b/vendor/github.com/spf13/afero/unionFile.go deleted file mode 100644 index 1e78f7d..0000000 --- a/vendor/github.com/spf13/afero/unionFile.go +++ /dev/null @@ -1,305 +0,0 @@ -package afero - -import ( - "io" - "os" - "path/filepath" - "syscall" -) - -// The UnionFile implements the afero.File interface and will be returned -// when reading a directory present at least in the overlay or opening a file -// for writing. -// -// The calls to -// Readdir() and Readdirnames() merge the file os.FileInfo / names from the -// base and the overlay - for files present in both layers, only those -// from the overlay will be used. -// -// When opening files for writing (Create() / OpenFile() with the right flags) -// the operations will be done in both layers, starting with the overlay. A -// successful read in the overlay will move the cursor position in the base layer -// by the number of bytes read. -type UnionFile struct { - Base File - Layer File - Merger DirsMerger - off int - files []os.FileInfo -} - -func (f *UnionFile) Close() error { - // first close base, so we have a newer timestamp in the overlay. If we'd close - // the overlay first, we'd get a cacheStale the next time we access this file - // -> cache would be useless ;-) - if f.Base != nil { - f.Base.Close() - } - if f.Layer != nil { - return f.Layer.Close() - } - return BADFD -} - -func (f *UnionFile) Read(s []byte) (int, error) { - if f.Layer != nil { - n, err := f.Layer.Read(s) - if (err == nil || err == io.EOF) && f.Base != nil { - // advance the file position also in the base file, the next - // call may be a write at this position (or a seek with SEEK_CUR) - if _, seekErr := f.Base.Seek(int64(n), os.SEEK_CUR); seekErr != nil { - // only overwrite err in case the seek fails: we need to - // report an eventual io.EOF to the caller - err = seekErr - } - } - return n, err - } - if f.Base != nil { - return f.Base.Read(s) - } - return 0, BADFD -} - -func (f *UnionFile) ReadAt(s []byte, o int64) (int, error) { - if f.Layer != nil { - n, err := f.Layer.ReadAt(s, o) - if (err == nil || err == io.EOF) && f.Base != nil { - _, err = f.Base.Seek(o+int64(n), os.SEEK_SET) - } - return n, err - } - if f.Base != nil { - return f.Base.ReadAt(s, o) - } - return 0, BADFD -} - -func (f *UnionFile) Seek(o int64, w int) (pos int64, err error) { - if f.Layer != nil { - pos, err = f.Layer.Seek(o, w) - if (err == nil || err == io.EOF) && f.Base != nil { - _, err = f.Base.Seek(o, w) - } - return pos, err - } - if f.Base != nil { - return f.Base.Seek(o, w) - } - return 0, BADFD -} - -func (f *UnionFile) Write(s []byte) (n int, err error) { - if f.Layer != nil { - n, err = f.Layer.Write(s) - if err == nil && f.Base != nil { // hmm, do we have fixed size files where a write may hit the EOF mark? - _, err = f.Base.Write(s) - } - return n, err - } - if f.Base != nil { - return f.Base.Write(s) - } - return 0, BADFD -} - -func (f *UnionFile) WriteAt(s []byte, o int64) (n int, err error) { - if f.Layer != nil { - n, err = f.Layer.WriteAt(s, o) - if err == nil && f.Base != nil { - _, err = f.Base.WriteAt(s, o) - } - return n, err - } - if f.Base != nil { - return f.Base.WriteAt(s, o) - } - return 0, BADFD -} - -func (f *UnionFile) Name() string { - if f.Layer != nil { - return f.Layer.Name() - } - return f.Base.Name() -} - -// DirsMerger is how UnionFile weaves two directories together. -// It takes the FileInfo slices from the layer and the base and returns a -// single view. -type DirsMerger func(lofi, bofi []os.FileInfo) ([]os.FileInfo, error) - -var defaultUnionMergeDirsFn = func(lofi, bofi []os.FileInfo) ([]os.FileInfo, error) { - var files = make(map[string]os.FileInfo) - - for _, fi := range lofi { - files[fi.Name()] = fi - } - - for _, fi := range bofi { - if _, exists := files[fi.Name()]; !exists { - files[fi.Name()] = fi - } - } - - rfi := make([]os.FileInfo, len(files)) - - i := 0 - for _, fi := range files { - rfi[i] = fi - i++ - } - - return rfi, nil - -} - -// Readdir will weave the two directories together and -// return a single view of the overlayed directories -func (f *UnionFile) Readdir(c int) (ofi []os.FileInfo, err error) { - var merge DirsMerger = f.Merger - if merge == nil { - merge = defaultUnionMergeDirsFn - } - - if f.off == 0 { - var lfi []os.FileInfo - if f.Layer != nil { - lfi, err = f.Layer.Readdir(-1) - if err != nil { - return nil, err - } - } - - var bfi []os.FileInfo - if f.Base != nil { - bfi, err = f.Base.Readdir(-1) - if err != nil { - return nil, err - } - - } - merged, err := merge(lfi, bfi) - if err != nil { - return nil, err - } - f.files = append(f.files, merged...) - } - if c == -1 { - return f.files[f.off:], nil - } - defer func() { f.off += c }() - return f.files[f.off:c], nil -} - -func (f *UnionFile) Readdirnames(c int) ([]string, error) { - rfi, err := f.Readdir(c) - if err != nil { - return nil, err - } - var names []string - for _, fi := range rfi { - names = append(names, fi.Name()) - } - return names, nil -} - -func (f *UnionFile) Stat() (os.FileInfo, error) { - if f.Layer != nil { - return f.Layer.Stat() - } - if f.Base != nil { - return f.Base.Stat() - } - return nil, BADFD -} - -func (f *UnionFile) Sync() (err error) { - if f.Layer != nil { - err = f.Layer.Sync() - if err == nil && f.Base != nil { - err = f.Base.Sync() - } - return err - } - if f.Base != nil { - return f.Base.Sync() - } - return BADFD -} - -func (f *UnionFile) Truncate(s int64) (err error) { - if f.Layer != nil { - err = f.Layer.Truncate(s) - if err == nil && f.Base != nil { - err = f.Base.Truncate(s) - } - return err - } - if f.Base != nil { - return f.Base.Truncate(s) - } - return BADFD -} - -func (f *UnionFile) WriteString(s string) (n int, err error) { - if f.Layer != nil { - n, err = f.Layer.WriteString(s) - if err == nil && f.Base != nil { - _, err = f.Base.WriteString(s) - } - return n, err - } - if f.Base != nil { - return f.Base.WriteString(s) - } - return 0, BADFD -} - -func copyToLayer(base Fs, layer Fs, name string) error { - bfh, err := base.Open(name) - if err != nil { - return err - } - defer bfh.Close() - - // First make sure the directory exists - exists, err := Exists(layer, filepath.Dir(name)) - if err != nil { - return err - } - if !exists { - err = layer.MkdirAll(filepath.Dir(name), 0777) // FIXME? - if err != nil { - return err - } - } - - // Create the file on the overlay - lfh, err := layer.Create(name) - if err != nil { - return err - } - n, err := io.Copy(lfh, bfh) - if err != nil { - // If anything fails, clean up the file - layer.Remove(name) - lfh.Close() - return err - } - - bfi, err := bfh.Stat() - if err != nil || bfi.Size() != n { - layer.Remove(name) - lfh.Close() - return syscall.EIO - } - - err = lfh.Close() - if err != nil { - layer.Remove(name) - lfh.Close() - return err - } - return layer.Chtimes(name, bfi.ModTime(), bfi.ModTime()) -} -- cgit v1.2.3