// Glob returns the names of all files matching pattern or nil
// if there is no matching file. The syntax of patterns is the same
// as in path.Match. The pattern may describe hierarchical names such as
// /usr/*/bin/ed.
//
// Glob ignores file system errors such as I/O errors reading directories.
// The only possible returned error is ErrBadPattern, when pattern
// is malformed.
func Glob(fs vfs.FileSystem, pattern string) (matches []string, err error) {
if !hasMeta(pattern) {
if _, err = fs.Lstat(pattern); err != nil {
return nil, nil
}
return []string{pattern}, nil
}
dir, file := path.Split(pattern)
switch dir {
case "":
dir = "."
case string(separator):
// nothing
default:
dir = dir[0 : len(dir)-1] // chop off trailing separator
}
if !hasMeta(dir) {
return glob(fs, dir, file, nil)
}
var m []string
m, err = Glob(fs, dir)
if err != nil {
return
}
for _, d := range m {
matches, err = glob(fs, d, file, matches)
if err != nil {
return
}
}
return
}
// Walk walks the filesystem rooted at root, calling walkFn for each file or
// directory in the filesystem, including root. All errors that arise visiting files
// and directories are filtered by walkFn. The files are walked in lexical
// order.
func Walk(fs vfs.FileSystem, root string, walkFn filepath.WalkFunc) error {
info, err := fs.Lstat(root)
if err != nil {
return walkFn(root, nil, err)
}
return walk(fs, root, info, walkFn)
}
// ReadCached reads a Tree's configuration from all of its source unit
// definition files (which may either be in a local VFS rooted at a
// .srclib-cache/<COMMITID> dir, or a remote VFS). It does not read
// the Srcfile; the Srcfile's directives are already accounted for in
// the cached source unit definition files.
//
// bdfs should be a VFS obtained from a call to
// (buildstore.RepoBuildStore).Commit.
func ReadCached(bdfs vfs.FileSystem) (*Tree, error) {
if _, err := bdfs.Lstat("."); os.IsNotExist(err) {
return nil, fmt.Errorf("build cache dir does not exist (did you run `srclib config` to create it)?")
} else if err != nil {
return nil, err
}
// Collect all **/*.unit.json files.
var unitFiles []string
unitSuffix := buildstore.DataTypeSuffix(unit.SourceUnit{})
w := fs.WalkFS(".", rwvfs.Walkable(rwvfs.ReadOnly(bdfs)))
for w.Step() {
if err := w.Err(); err != nil {
return nil, err
}
if path := w.Path(); strings.HasSuffix(path, unitSuffix) {
unitFiles = append(unitFiles, path)
}
}
// Parse units
sort.Strings(unitFiles)
units := make([]*unit.SourceUnit, len(unitFiles))
par := parallel.NewRun(runtime.GOMAXPROCS(0))
for i_, unitFile_ := range unitFiles {
i, unitFile := i_, unitFile_
par.Acquire()
go func() {
defer par.Release()
f, err := bdfs.Open(unitFile)
if err != nil {
par.Error(err)
return
}
if err := json.NewDecoder(f).Decode(&units[i]); err != nil {
f.Close()
par.Error(err)
return
}
if err := f.Close(); err != nil {
par.Error(err)
return
}
}()
}
if err := par.Wait(); err != nil {
return nil, err
}
return &Tree{SourceUnits: units}, nil
}
// GetFileWithOptions gets a file and observes the options specified
// in opt. If fs implements FileGetter, fs.GetFileWithOptions is
// called; otherwise the options are applied on the client side after
// fetching the whole file.
func GetFileWithOptions(fs vfs.FileSystem, path string, opt GetFileOptions) (*FileWithRange, error) {
if fg, ok := fs.(FileGetter); ok {
return fg.GetFileWithOptions(path, opt)
}
fi, err := fs.Lstat(path)
if err != nil {
return nil, err
}
e := newTreeEntry(fi)
fwr := FileWithRange{TreeEntry: e}
if fi.Mode().IsDir() {
ee, err := readDir(fs, path, opt.RecurseSingleSubfolder, true)
if err != nil {
return nil, err
}
sort.Sort(TreeEntriesByTypeByName(ee))
e.Entries = ee
} else if fi.Mode().IsRegular() {
f, err := fs.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
contents, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
e.Contents = contents
if empty := (GetFileOptions{}); opt != empty {
fr, _, err := ComputeFileRange(contents, opt)
if err != nil {
return nil, err
}
// Trim to only requested range.
e.Contents = e.Contents[fr.StartByte:fr.EndByte]
fwr.FileRange = *fr
}
}
return &fwr, nil
}
// walk recursively descends path, calling walkFn.
func walk(fs vfs.FileSystem, path string, info os.FileInfo, walkFn filepath.WalkFunc) error {
err := walkFn(path, info, nil)
if err != nil {
if info.IsDir() && err == filepath.SkipDir {
return nil
}
return err
}
if !info.IsDir() {
return nil
}
names, err := readDirNames(fs, path)
if err != nil {
return walkFn(path, info, err)
}
for _, name := range names {
filename := pathpkg.Join(path, name)
fileInfo, err := fs.Lstat(filename)
if err != nil {
if err := walkFn(filename, fileInfo, err); err != nil && err != filepath.SkipDir {
return err
}
} else {
err = walk(fs, filename, fileInfo, walkFn)
if err != nil {
if !fileInfo.IsDir() || err != filepath.SkipDir {
return err
}
}
}
}
return nil
}
