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ops.go
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ops.go
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package mfs
import (
"errors"
"fmt"
"os"
gopath "path"
"strings"
path "github.com/ipfs/go-ipfs/path"
cid "gx/ipfs/QmNp85zy9RLrQ5oQD4hPyS39ezrrXpcaa7R4Y9kxdWQLLQ/go-cid"
node "gx/ipfs/QmPN7cwmpcc4DWXb4KTB9dNAJgjuPY69h3npsMfhRrQL9c/go-ipld-format"
)
// Mv moves the file or directory at 'src' to 'dst'
func Mv(r *Root, src, dst string) error {
srcDir, srcFname := gopath.Split(src)
var dstDirStr string
var filename string
if dst[len(dst)-1] == '/' {
dstDirStr = dst
filename = srcFname
} else {
dstDirStr, filename = gopath.Split(dst)
}
// get parent directories of both src and dest first
dstDir, err := lookupDir(r, dstDirStr)
if err != nil {
return err
}
srcDirObj, err := lookupDir(r, srcDir)
if err != nil {
return err
}
srcObj, err := srcDirObj.Child(srcFname)
if err != nil {
return err
}
nd, err := srcObj.GetNode()
if err != nil {
return err
}
fsn, err := dstDir.Child(filename)
if err == nil {
switch n := fsn.(type) {
case *File:
_ = dstDir.Unlink(filename)
case *Directory:
dstDir = n
default:
return fmt.Errorf("unexpected type at path: %s", dst)
}
} else if err != os.ErrNotExist {
return err
}
err = dstDir.AddChild(filename, nd)
if err != nil {
return err
}
return srcDirObj.Unlink(srcFname)
}
func lookupDir(r *Root, path string) (*Directory, error) {
di, err := Lookup(r, path)
if err != nil {
return nil, err
}
d, ok := di.(*Directory)
if !ok {
return nil, fmt.Errorf("%s is not a directory", path)
}
return d, nil
}
// PutNode inserts 'nd' at 'path' in the given mfs
func PutNode(r *Root, path string, nd node.Node) error {
dirp, filename := gopath.Split(path)
if filename == "" {
return fmt.Errorf("cannot create file with empty name")
}
pdir, err := lookupDir(r, dirp)
if err != nil {
return err
}
return pdir.AddChild(filename, nd)
}
// MkdirOpts is used by Mkdir
type MkdirOpts struct {
Mkparents bool
Flush bool
Prefix *cid.Prefix
}
// Mkdir creates a directory at 'path' under the directory 'd', creating
// intermediary directories as needed if 'mkparents' is set to true
func Mkdir(r *Root, pth string, opts MkdirOpts) error {
if pth == "" {
return fmt.Errorf("no path given to Mkdir")
}
parts := path.SplitList(pth)
if parts[0] == "" {
parts = parts[1:]
}
// allow 'mkdir /a/b/c/' to create c
if parts[len(parts)-1] == "" {
parts = parts[:len(parts)-1]
}
if len(parts) == 0 {
// this will only happen on 'mkdir /'
if opts.Mkparents {
return nil
}
return fmt.Errorf("cannot create directory '/': Already exists")
}
cur := r.GetValue().(*Directory)
for i, d := range parts[:len(parts)-1] {
fsn, err := cur.Child(d)
if err == os.ErrNotExist && opts.Mkparents {
mkd, err := cur.Mkdir(d)
if err != nil {
return err
}
if opts.Prefix != nil {
mkd.SetPrefix(opts.Prefix)
}
fsn = mkd
} else if err != nil {
return err
}
next, ok := fsn.(*Directory)
if !ok {
return fmt.Errorf("%s was not a directory", path.Join(parts[:i]))
}
cur = next
}
final, err := cur.Mkdir(parts[len(parts)-1])
if err != nil {
if !opts.Mkparents || err != os.ErrExist || final == nil {
return err
}
}
if opts.Prefix != nil {
final.SetPrefix(opts.Prefix)
}
if opts.Flush {
err := final.Flush()
if err != nil {
return err
}
}
return nil
}
func Lookup(r *Root, path string) (FSNode, error) {
dir, ok := r.GetValue().(*Directory)
if !ok {
log.Errorf("root not a dir: %#v", r.GetValue())
return nil, errors.New("root was not a directory")
}
return DirLookup(dir, path)
}
// DirLookup will look up a file or directory at the given path
// under the directory 'd'
func DirLookup(d *Directory, pth string) (FSNode, error) {
pth = strings.Trim(pth, "/")
parts := path.SplitList(pth)
if len(parts) == 1 && parts[0] == "" {
return d, nil
}
var cur FSNode
cur = d
for i, p := range parts {
chdir, ok := cur.(*Directory)
if !ok {
return nil, fmt.Errorf("cannot access %s: Not a directory", path.Join(parts[:i+1]))
}
child, err := chdir.Child(p)
if err != nil {
return nil, err
}
cur = child
}
return cur, nil
}
func FlushPath(rt *Root, pth string) error {
nd, err := Lookup(rt, pth)
if err != nil {
return err
}
err = nd.Flush()
if err != nil {
return err
}
rt.repub.WaitPub()
return nil
}