// 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() {
entries, err := fs.ReadDir(path)
if err != nil {
return nil, err
}
e.Entries = make([]*TreeEntry, len(entries))
for i, fi := range entries {
e.Entries[i] = newTreeEntry(fi)
}
sort.Sort(TreeEntriesByTypeByName(e.Entries))
} 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
}
// 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 `src 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.Do(func() error {
f, err := bdfs.Open(unitFile)
if err != nil {
return err
}
if err := json.NewDecoder(f).Decode(&units[i]); err != nil {
f.Close()
return err
}
if err := f.Close(); err != nil {
return err
}
return nil
})
}
if err := par.Wait(); err != nil {
return nil, err
}
return &Tree{SourceUnits: units}, nil
}