package arvados
import (
+ "errors"
+ "fmt"
+ "io"
+ "net/http"
"os"
+ "path"
+ "strings"
"sync"
+ "time"
)
+var (
+ ErrReadOnlyFile = errors.New("read-only file")
+ ErrNegativeOffset = errors.New("cannot seek to negative offset")
+ ErrFileExists = errors.New("file exists")
+ ErrInvalidOperation = errors.New("invalid operation")
+ ErrInvalidArgument = errors.New("invalid argument")
+ ErrDirectoryNotEmpty = errors.New("directory not empty")
+ ErrWriteOnlyMode = errors.New("file is O_WRONLY")
+ ErrSyncNotSupported = errors.New("O_SYNC flag is not supported")
+ ErrIsDirectory = errors.New("cannot rename file to overwrite existing directory")
+ ErrPermission = os.ErrPermission
+)
+
+// A File is an *os.File-like interface for reading and writing files
+// in a FileSystem.
+type File interface {
+ io.Reader
+ io.Writer
+ io.Closer
+ io.Seeker
+ Size() int64
+ Readdir(int) ([]os.FileInfo, error)
+ Stat() (os.FileInfo, error)
+ Truncate(int64) error
+}
+
+// A FileSystem is an http.Filesystem plus Stat() and support for
+// opening writable files. All methods are safe to call from multiple
+// goroutines.
+type FileSystem interface {
+ http.FileSystem
+
+ inode
+
+ // analogous to os.Stat()
+ Stat(name string) (os.FileInfo, error)
+
+ // analogous to os.Create(): create/truncate a file and open it O_RDWR.
+ Create(name string) (File, error)
+
+ // Like os.OpenFile(): create or open a file or directory.
+ //
+ // If flag&os.O_EXCL==0, it opens an existing file or
+ // directory if one exists. If flag&os.O_CREATE!=0, it creates
+ // a new empty file or directory if one does not already
+ // exist.
+ //
+ // When creating a new item, perm&os.ModeDir determines
+ // whether it is a file or a directory.
+ //
+ // A file can be opened multiple times and used concurrently
+ // from multiple goroutines. However, each File object should
+ // be used by only one goroutine at a time.
+ OpenFile(name string, flag int, perm os.FileMode) (File, error)
+
+ Mkdir(name string, perm os.FileMode) error
+ Remove(name string) error
+ RemoveAll(name string) error
+ Rename(oldname, newname string) error
+}
+
+type inode interface {
+ Parent() inode
+ Read([]byte, filenodePtr) (int, filenodePtr, error)
+ Write([]byte, filenodePtr) (int, filenodePtr, error)
+ Truncate(int64) error
+ IsDir() bool
+ Readdir() []os.FileInfo
+ Size() int64
+ FileInfo() os.FileInfo
+
+ // Child() performs lookups and updates of named child nodes.
+ //
+ // If replace is non-nil, Child calls replace(x) where x is
+ // the current child inode with the given name. If possible,
+ // the child inode is replaced with the one returned by
+ // replace().
+ //
+ // Nil represents "no child". replace(nil) signifies that no
+ // child with this name exists yet. If replace() returns nil,
+ // the existing child should be deleted if possible.
+ //
+ // An implementation of Child() is permitted to ignore
+ // replace() or its return value. For example, a regular file
+ // inode does not have children, so Child() always returns
+ // nil.
+ //
+ // Child() returns the child, if any, with the given name: if
+ // a child was added or changed, the new child is returned.
+ //
+ // Caller must have lock (or rlock if replace is nil).
+ Child(name string, replace func(inode) inode) inode
+
+ sync.Locker
+ RLock()
+ RUnlock()
+}
+
+type fileinfo struct {
+ name string
+ mode os.FileMode
+ size int64
+ modTime time.Time
+}
+
+// Name implements os.FileInfo.
+func (fi fileinfo) Name() string {
+ return fi.name
+}
+
+// ModTime implements os.FileInfo.
+func (fi fileinfo) ModTime() time.Time {
+ return fi.modTime
+}
+
+// Mode implements os.FileInfo.
+func (fi fileinfo) Mode() os.FileMode {
+ return fi.mode
+}
+
+// IsDir implements os.FileInfo.
+func (fi fileinfo) IsDir() bool {
+ return fi.mode&os.ModeDir != 0
+}
+
+// Size implements os.FileInfo.
+func (fi fileinfo) Size() int64 {
+ return fi.size
+}
+
+// Sys implements os.FileInfo.
+func (fi fileinfo) Sys() interface{} {
+ return nil
+}
+
type nullnode struct{}
func (*nullnode) Mkdir(string, os.FileMode) error {
}
return
}
+
+type fileSystem struct {
+ inode
+}
+
+// OpenFile is analogous to os.OpenFile().
+func (fs *fileSystem) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
+ return fs.openFile(name, flag, perm)
+}
+
+func (fs *fileSystem) openFile(name string, flag int, perm os.FileMode) (*filehandle, error) {
+ var dn inode = fs.inode
+ if flag&os.O_SYNC != 0 {
+ return nil, ErrSyncNotSupported
+ }
+ dirname, name := path.Split(name)
+ parent := rlookup(dn, dirname)
+ if parent == nil {
+ return nil, os.ErrNotExist
+ }
+ var readable, writable bool
+ switch flag & (os.O_RDWR | os.O_RDONLY | os.O_WRONLY) {
+ case os.O_RDWR:
+ readable = true
+ writable = true
+ case os.O_RDONLY:
+ readable = true
+ case os.O_WRONLY:
+ writable = true
+ default:
+ return nil, fmt.Errorf("invalid flags 0x%x", flag)
+ }
+ if !writable && parent.IsDir() {
+ // A directory can be opened via "foo/", "foo/.", or
+ // "foo/..".
+ switch name {
+ case ".", "":
+ return &filehandle{inode: parent}, nil
+ case "..":
+ return &filehandle{inode: parent.Parent()}, nil
+ }
+ }
+ createMode := flag&os.O_CREATE != 0
+ if createMode {
+ parent.Lock()
+ defer parent.Unlock()
+ } else {
+ parent.RLock()
+ defer parent.RUnlock()
+ }
+ n := parent.Child(name, nil)
+ if n == nil {
+ if !createMode {
+ return nil, os.ErrNotExist
+ }
+ var err error
+ n = parent.Child(name, func(inode) inode {
+ var dn *dirnode
+ switch parent := parent.(type) {
+ case *dirnode:
+ dn = parent
+ case *collectionFileSystem:
+ dn = parent.inode.(*dirnode)
+ default:
+ err = ErrInvalidArgument
+ return nil
+ }
+ if perm.IsDir() {
+ n, err = dn.newDirnode(dn, name, perm|0755, time.Now())
+ } else {
+ n, err = dn.newFilenode(dn, name, perm|0755, time.Now())
+ }
+ return n
+ })
+ if err != nil {
+ return nil, err
+ } else if n == nil {
+ // parent rejected new child
+ return nil, ErrInvalidOperation
+ }
+ } else if flag&os.O_EXCL != 0 {
+ return nil, ErrFileExists
+ } else if flag&os.O_TRUNC != 0 {
+ if !writable {
+ return nil, fmt.Errorf("invalid flag O_TRUNC in read-only mode")
+ } else if fn, ok := n.(*filenode); !ok {
+ return nil, fmt.Errorf("invalid flag O_TRUNC when opening directory")
+ } else {
+ fn.Truncate(0)
+ }
+ }
+ return &filehandle{
+ inode: n,
+ append: flag&os.O_APPEND != 0,
+ readable: readable,
+ writable: writable,
+ }, nil
+}
+
+func (fs *fileSystem) Open(name string) (http.File, error) {
+ return fs.OpenFile(name, os.O_RDONLY, 0)
+}
+
+func (fs *fileSystem) Create(name string) (File, error) {
+ return fs.OpenFile(name, os.O_CREATE|os.O_RDWR|os.O_TRUNC, 0)
+}
+
+func (fs *fileSystem) Mkdir(name string, perm os.FileMode) (err error) {
+ dirname, name := path.Split(name)
+ n := rlookup(fs.inode, dirname)
+ if n == nil {
+ return os.ErrNotExist
+ }
+ n.Lock()
+ defer n.Unlock()
+ if n.Child(name, nil) != nil {
+ return os.ErrExist
+ }
+ dn, ok := n.(*dirnode)
+ if !ok {
+ return ErrInvalidArgument
+ }
+ child := n.Child(name, func(inode) (child inode) {
+ child, err = dn.newDirnode(dn, name, perm, time.Now())
+ return
+ })
+ if err != nil {
+ return err
+ } else if child == nil {
+ return ErrInvalidArgument
+ }
+ return nil
+}
+
+func (fs *fileSystem) Stat(name string) (fi os.FileInfo, err error) {
+ node := rlookup(fs.inode, name)
+ if node == nil {
+ err = os.ErrNotExist
+ } else {
+ fi = node.FileInfo()
+ }
+ return
+}
+
+func (fs *fileSystem) Rename(oldname, newname string) error {
+ olddir, oldname := path.Split(oldname)
+ if oldname == "" || oldname == "." || oldname == ".." {
+ return ErrInvalidArgument
+ }
+ olddirf, err := fs.openFile(olddir+".", os.O_RDONLY, 0)
+ if err != nil {
+ return fmt.Errorf("%q: %s", olddir, err)
+ }
+ defer olddirf.Close()
+
+ newdir, newname := path.Split(newname)
+ if newname == "." || newname == ".." {
+ return ErrInvalidArgument
+ } else if newname == "" {
+ // Rename("a/b", "c/") means Rename("a/b", "c/b")
+ newname = oldname
+ }
+ newdirf, err := fs.openFile(newdir+".", os.O_RDONLY, 0)
+ if err != nil {
+ return fmt.Errorf("%q: %s", newdir, err)
+ }
+ defer newdirf.Close()
+
+ // When acquiring locks on multiple nodes, all common
+ // ancestors must be locked first in order to avoid
+ // deadlock. This is assured by locking the path from root to
+ // newdir, then locking the path from root to olddir, skipping
+ // any already-locked nodes.
+ needLock := []sync.Locker{}
+ for _, f := range []*filehandle{olddirf, newdirf} {
+ node := f.inode
+ needLock = append(needLock, node)
+ for node.Parent() != node {
+ node = node.Parent()
+ needLock = append(needLock, node)
+ }
+ }
+ locked := map[sync.Locker]bool{}
+ for i := len(needLock) - 1; i >= 0; i-- {
+ if n := needLock[i]; !locked[n] {
+ n.Lock()
+ defer n.Unlock()
+ locked[n] = true
+ }
+ }
+
+ if _, ok := newdirf.inode.(*dirnode); !ok {
+ return ErrInvalidOperation
+ }
+
+ err = nil
+ olddirf.inode.Child(oldname, func(oldinode inode) inode {
+ if oldinode == nil {
+ err = os.ErrNotExist
+ return nil
+ }
+ newdirf.inode.Child(newname, func(existing inode) inode {
+ if existing != nil && existing.IsDir() {
+ err = ErrIsDirectory
+ return existing
+ }
+ return oldinode
+ })
+ if err != nil {
+ return oldinode
+ }
+ oldinode.Lock()
+ defer oldinode.Unlock()
+ olddn := olddirf.inode.(*dirnode)
+ newdn := newdirf.inode.(*dirnode)
+ switch n := oldinode.(type) {
+ case *dirnode:
+ n.parent = newdirf.inode
+ n.treenode.fileinfo.name = newname
+ case *filenode:
+ n.parent = newdn
+ n.fileinfo.name = newname
+ default:
+ panic(fmt.Sprintf("bad inode type %T", n))
+ }
+ olddn.treenode.fileinfo.modTime = time.Now()
+ newdn.treenode.fileinfo.modTime = time.Now()
+ return nil
+ })
+ return err
+}
+
+func (fs *fileSystem) Remove(name string) error {
+ return fs.remove(strings.TrimRight(name, "/"), false)
+}
+
+func (fs *fileSystem) RemoveAll(name string) error {
+ err := fs.remove(strings.TrimRight(name, "/"), true)
+ if os.IsNotExist(err) {
+ // "If the path does not exist, RemoveAll returns
+ // nil." (see "os" pkg)
+ err = nil
+ }
+ return err
+}
+
+func (fs *fileSystem) remove(name string, recursive bool) (err error) {
+ dirname, name := path.Split(name)
+ if name == "" || name == "." || name == ".." {
+ return ErrInvalidArgument
+ }
+ dir := rlookup(fs, dirname)
+ if dir == nil {
+ return os.ErrNotExist
+ }
+ dir.Lock()
+ defer dir.Unlock()
+ dir.Child(name, func(node inode) inode {
+ if node == nil {
+ err = os.ErrNotExist
+ return nil
+ }
+ if !recursive && node.IsDir() && node.Size() > 0 {
+ err = ErrDirectoryNotEmpty
+ return node
+ }
+ return nil
+ })
+ return err
+}
import (
"encoding/json"
- "errors"
"fmt"
"io"
- "net/http"
"os"
"path"
"regexp"
"time"
)
-var (
- ErrReadOnlyFile = errors.New("read-only file")
- ErrNegativeOffset = errors.New("cannot seek to negative offset")
- ErrFileExists = errors.New("file exists")
- ErrInvalidOperation = errors.New("invalid operation")
- ErrInvalidArgument = errors.New("invalid argument")
- ErrDirectoryNotEmpty = errors.New("directory not empty")
- ErrWriteOnlyMode = errors.New("file is O_WRONLY")
- ErrSyncNotSupported = errors.New("O_SYNC flag is not supported")
- ErrIsDirectory = errors.New("cannot rename file to overwrite existing directory")
- ErrPermission = os.ErrPermission
-
- maxBlockSize = 1 << 26
-)
-
-// A File is an *os.File-like interface for reading and writing files
-// in a CollectionFileSystem.
-type File interface {
- io.Reader
- io.Writer
- io.Closer
- io.Seeker
- Size() int64
- Readdir(int) ([]os.FileInfo, error)
- Stat() (os.FileInfo, error)
- Truncate(int64) error
-}
+var maxBlockSize = 1 << 26
type keepClient interface {
ReadAt(locator string, p []byte, off int) (int, error)
PutB(p []byte) (string, int, error)
}
-type fileinfo struct {
- name string
- mode os.FileMode
- size int64
- modTime time.Time
-}
-
-// Name implements os.FileInfo.
-func (fi fileinfo) Name() string {
- return fi.name
-}
-
-// ModTime implements os.FileInfo.
-func (fi fileinfo) ModTime() time.Time {
- return fi.modTime
-}
-
-// Mode implements os.FileInfo.
-func (fi fileinfo) Mode() os.FileMode {
- return fi.mode
-}
-
-// IsDir implements os.FileInfo.
-func (fi fileinfo) IsDir() bool {
- return fi.mode&os.ModeDir != 0
-}
-
-// Size implements os.FileInfo.
-func (fi fileinfo) Size() int64 {
- return fi.size
-}
-
-// Sys implements os.FileInfo.
-func (fi fileinfo) Sys() interface{} {
- return nil
-}
-
-// A FileSystem is an http.Filesystem plus Stat() and support for
-// opening writable files. All methods are safe to call from multiple
-// goroutines.
-type FileSystem interface {
- http.FileSystem
-
- inode
-
- // analogous to os.Stat()
- Stat(name string) (os.FileInfo, error)
-
- // analogous to os.Create(): create/truncate a file and open it O_RDWR.
- Create(name string) (File, error)
-
- // Like os.OpenFile(): create or open a file or directory.
- //
- // If flag&os.O_EXCL==0, it opens an existing file or
- // directory if one exists. If flag&os.O_CREATE!=0, it creates
- // a new empty file or directory if one does not already
- // exist.
- //
- // When creating a new item, perm&os.ModeDir determines
- // whether it is a file or a directory.
- //
- // A file can be opened multiple times and used concurrently
- // from multiple goroutines. However, each File object should
- // be used by only one goroutine at a time.
- OpenFile(name string, flag int, perm os.FileMode) (File, error)
-
- Mkdir(name string, perm os.FileMode) error
- Remove(name string) error
- RemoveAll(name string) error
- Rename(oldname, newname string) error
-}
-
// A CollectionFileSystem is a FileSystem that can be serialized as a
// manifest and stored as a collection.
type CollectionFileSystem interface {
MarshalManifest(prefix string) (string, error)
}
-type fileSystem struct {
- inode
+// FileSystem returns a CollectionFileSystem for the collection.
+func (c *Collection) FileSystem(client *Client, kc keepClient) (CollectionFileSystem, error) {
+ var modTime time.Time
+ if c.ModifiedAt == nil {
+ modTime = time.Now()
+ } else {
+ modTime = *c.ModifiedAt
+ }
+ dn := &dirnode{
+ client: client,
+ kc: kc,
+ treenode: treenode{
+ fileinfo: fileinfo{
+ name: ".",
+ mode: os.ModeDir | 0755,
+ modTime: modTime,
+ },
+ parent: nil,
+ inodes: make(map[string]inode),
+ },
+ }
+ dn.parent = dn
+ fs := &collectionFileSystem{fileSystem: fileSystem{inode: dn}}
+ if err := dn.loadManifest(c.ManifestText); err != nil {
+ return nil, err
+ }
+ return fs, nil
}
type collectionFileSystem struct {
return fs.fileSystem.inode.(*dirnode).marshalManifest(prefix)
}
-// OpenFile is analogous to os.OpenFile().
-func (fs *fileSystem) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
- return fs.openFile(name, flag, perm)
-}
-
-func (fs *fileSystem) openFile(name string, flag int, perm os.FileMode) (*filehandle, error) {
- var dn inode = fs.inode
- if flag&os.O_SYNC != 0 {
- return nil, ErrSyncNotSupported
- }
- dirname, name := path.Split(name)
- parent := rlookup(dn, dirname)
- if parent == nil {
- return nil, os.ErrNotExist
- }
- var readable, writable bool
- switch flag & (os.O_RDWR | os.O_RDONLY | os.O_WRONLY) {
- case os.O_RDWR:
- readable = true
- writable = true
- case os.O_RDONLY:
- readable = true
- case os.O_WRONLY:
- writable = true
- default:
- return nil, fmt.Errorf("invalid flags 0x%x", flag)
- }
- if !writable && parent.IsDir() {
- // A directory can be opened via "foo/", "foo/.", or
- // "foo/..".
- switch name {
- case ".", "":
- return &filehandle{inode: parent}, nil
- case "..":
- return &filehandle{inode: parent.Parent()}, nil
- }
- }
- createMode := flag&os.O_CREATE != 0
- if createMode {
- parent.Lock()
- defer parent.Unlock()
- } else {
- parent.RLock()
- defer parent.RUnlock()
- }
- n := parent.Child(name, nil)
- if n == nil {
- if !createMode {
- return nil, os.ErrNotExist
- }
- var err error
- n = parent.Child(name, func(inode) inode {
- var dn *dirnode
- switch parent := parent.(type) {
- case *dirnode:
- dn = parent
- case *collectionFileSystem:
- dn = parent.inode.(*dirnode)
- default:
- err = ErrInvalidArgument
- return nil
- }
- if perm.IsDir() {
- n, err = dn.newDirnode(dn, name, perm|0755, time.Now())
- } else {
- n, err = dn.newFilenode(dn, name, perm|0755, time.Now())
- }
- return n
- })
- if err != nil {
- return nil, err
- } else if n == nil {
- // parent rejected new child
- return nil, ErrInvalidOperation
- }
- } else if flag&os.O_EXCL != 0 {
- return nil, ErrFileExists
- } else if flag&os.O_TRUNC != 0 {
- if !writable {
- return nil, fmt.Errorf("invalid flag O_TRUNC in read-only mode")
- } else if fn, ok := n.(*filenode); !ok {
- return nil, fmt.Errorf("invalid flag O_TRUNC when opening directory")
- } else {
- fn.Truncate(0)
- }
- }
- return &filehandle{
- inode: n,
- append: flag&os.O_APPEND != 0,
- readable: readable,
- writable: writable,
- }, nil
-}
-
-func (fs *fileSystem) Open(name string) (http.File, error) {
- return fs.OpenFile(name, os.O_RDONLY, 0)
-}
-
-func (fs *fileSystem) Create(name string) (File, error) {
- return fs.OpenFile(name, os.O_CREATE|os.O_RDWR|os.O_TRUNC, 0)
-}
-
-func (fs *fileSystem) Mkdir(name string, perm os.FileMode) (err error) {
- dirname, name := path.Split(name)
- n := rlookup(fs.inode, dirname)
- if n == nil {
- return os.ErrNotExist
- }
- n.Lock()
- defer n.Unlock()
- if n.Child(name, nil) != nil {
- return os.ErrExist
- }
- dn, ok := n.(*dirnode)
- if !ok {
- return ErrInvalidArgument
- }
- child := n.Child(name, func(inode) (child inode) {
- child, err = dn.newDirnode(dn, name, perm, time.Now())
- return
- })
- if err != nil {
- return err
- } else if child == nil {
- return ErrInvalidArgument
- }
- return nil
-}
-
-func (fs *fileSystem) Stat(name string) (fi os.FileInfo, err error) {
- node := rlookup(fs.inode, name)
- if node == nil {
- err = os.ErrNotExist
- } else {
- fi = node.FileInfo()
- }
- return
-}
-
-func (fs *fileSystem) Rename(oldname, newname string) error {
- olddir, oldname := path.Split(oldname)
- if oldname == "" || oldname == "." || oldname == ".." {
- return ErrInvalidArgument
- }
- olddirf, err := fs.openFile(olddir+".", os.O_RDONLY, 0)
- if err != nil {
- return fmt.Errorf("%q: %s", olddir, err)
- }
- defer olddirf.Close()
-
- newdir, newname := path.Split(newname)
- if newname == "." || newname == ".." {
- return ErrInvalidArgument
- } else if newname == "" {
- // Rename("a/b", "c/") means Rename("a/b", "c/b")
- newname = oldname
- }
- newdirf, err := fs.openFile(newdir+".", os.O_RDONLY, 0)
- if err != nil {
- return fmt.Errorf("%q: %s", newdir, err)
- }
- defer newdirf.Close()
-
- // When acquiring locks on multiple nodes, all common
- // ancestors must be locked first in order to avoid
- // deadlock. This is assured by locking the path from root to
- // newdir, then locking the path from root to olddir, skipping
- // any already-locked nodes.
- needLock := []sync.Locker{}
- for _, f := range []*filehandle{olddirf, newdirf} {
- node := f.inode
- needLock = append(needLock, node)
- for node.Parent() != node {
- node = node.Parent()
- needLock = append(needLock, node)
- }
- }
- locked := map[sync.Locker]bool{}
- for i := len(needLock) - 1; i >= 0; i-- {
- if n := needLock[i]; !locked[n] {
- n.Lock()
- defer n.Unlock()
- locked[n] = true
- }
- }
-
- if _, ok := newdirf.inode.(*dirnode); !ok {
- return ErrInvalidOperation
- }
-
- err = nil
- olddirf.inode.Child(oldname, func(oldinode inode) inode {
- if oldinode == nil {
- err = os.ErrNotExist
- return nil
- }
- newdirf.inode.Child(newname, func(existing inode) inode {
- if existing != nil && existing.IsDir() {
- err = ErrIsDirectory
- return existing
- }
- return oldinode
- })
- if err != nil {
- return oldinode
- }
- oldinode.Lock()
- defer oldinode.Unlock()
- olddn := olddirf.inode.(*dirnode)
- newdn := newdirf.inode.(*dirnode)
- switch n := oldinode.(type) {
- case *dirnode:
- n.parent = newdirf.inode
- n.treenode.fileinfo.name = newname
- case *filenode:
- n.parent = newdn
- n.fileinfo.name = newname
- default:
- panic(fmt.Sprintf("bad inode type %T", n))
- }
- olddn.treenode.fileinfo.modTime = time.Now()
- newdn.treenode.fileinfo.modTime = time.Now()
- return nil
- })
- return err
-}
-
-func (fs *fileSystem) Remove(name string) error {
- return fs.remove(strings.TrimRight(name, "/"), false)
-}
-
-func (fs *fileSystem) RemoveAll(name string) error {
- err := fs.remove(strings.TrimRight(name, "/"), true)
- if os.IsNotExist(err) {
- // "If the path does not exist, RemoveAll returns
- // nil." (see "os" pkg)
- err = nil
- }
- return err
-}
-
-func (fs *fileSystem) remove(name string, recursive bool) (err error) {
- dirname, name := path.Split(name)
- if name == "" || name == "." || name == ".." {
- return ErrInvalidArgument
- }
- dir := rlookup(fs, dirname)
- if dir == nil {
- return os.ErrNotExist
- }
- dir.Lock()
- defer dir.Unlock()
- dir.Child(name, func(node inode) inode {
- if node == nil {
- err = os.ErrNotExist
- return nil
- }
- if !recursive && node.IsDir() && node.Size() > 0 {
- err = ErrDirectoryNotEmpty
- return node
- }
- return nil
- })
- return err
-}
-
-type inode interface {
- Parent() inode
- Read([]byte, filenodePtr) (int, filenodePtr, error)
- Write([]byte, filenodePtr) (int, filenodePtr, error)
- Truncate(int64) error
- IsDir() bool
- Readdir() []os.FileInfo
- Size() int64
- FileInfo() os.FileInfo
- // Caller must have lock (or rlock if func is nil)
- Child(string, func(inode) inode) inode
- sync.Locker
- RLock()
- RUnlock()
-}
-
-// filenode implements inode.
-type filenode struct {
- fileinfo fileinfo
- parent *dirnode
- segments []segment
- // number of times `segments` has changed in a
- // way that might invalidate a filenodePtr
- repacked int64
- memsize int64 // bytes in memSegments
- sync.RWMutex
- nullnode
-}
-
// filenodePtr is an offset into a file that is (usually) efficient to
// seek to. Specifically, if filenode.repacked==filenodePtr.repacked
// then
return
}
+// filenode implements inode.
+type filenode struct {
+ fileinfo fileinfo
+ parent *dirnode
+ segments []segment
+ // number of times `segments` has changed in a
+ // way that might invalidate a filenodePtr
+ repacked int64
+ memsize int64 // bytes in memSegments
+ sync.RWMutex
+ nullnode
+}
+
// caller must have lock
func (fn *filenode) appendSegment(e segment) {
fn.segments = append(fn.segments, e)
}
}
-// FileSystem returns a CollectionFileSystem for the collection.
-func (c *Collection) FileSystem(client *Client, kc keepClient) (CollectionFileSystem, error) {
- var modTime time.Time
- if c.ModifiedAt == nil {
- modTime = time.Now()
- } else {
- modTime = *c.ModifiedAt
- }
- dn := &dirnode{
- client: client,
- kc: kc,
- treenode: treenode{
- fileinfo: fileinfo{
- name: ".",
- mode: os.ModeDir | 0755,
- modTime: modTime,
- },
- parent: nil,
- inodes: make(map[string]inode),
- },
- }
- dn.parent = dn
- fs := &collectionFileSystem{fileSystem: fileSystem{inode: dn}}
- if err := dn.loadManifest(c.ManifestText); err != nil {
- return nil, err
- }
- return fs, nil
-}
-
-type filehandle struct {
- inode
- ptr filenodePtr
- append bool
- readable bool
- writable bool
- unreaddirs []os.FileInfo
-}
-
-func (f *filehandle) Read(p []byte) (n int, err error) {
- if !f.readable {
- return 0, ErrWriteOnlyMode
- }
- f.inode.RLock()
- defer f.inode.RUnlock()
- n, f.ptr, err = f.inode.Read(p, f.ptr)
- return
-}
-
-func (f *filehandle) Seek(off int64, whence int) (pos int64, err error) {
- size := f.inode.Size()
- ptr := f.ptr
- switch whence {
- case io.SeekStart:
- ptr.off = off
- case io.SeekCurrent:
- ptr.off += off
- case io.SeekEnd:
- ptr.off = size + off
- }
- if ptr.off < 0 {
- return f.ptr.off, ErrNegativeOffset
- }
- if ptr.off != f.ptr.off {
- f.ptr = ptr
- // force filenode to recompute f.ptr fields on next
- // use
- f.ptr.repacked = -1
- }
- return f.ptr.off, nil
-}
-
-func (f *filehandle) Truncate(size int64) error {
- return f.inode.Truncate(size)
-}
-
-func (f *filehandle) Write(p []byte) (n int, err error) {
- if !f.writable {
- return 0, ErrReadOnlyFile
- }
- f.inode.Lock()
- defer f.inode.Unlock()
- if fn, ok := f.inode.(*filenode); ok && f.append {
- f.ptr = filenodePtr{
- off: fn.fileinfo.size,
- segmentIdx: len(fn.segments),
- segmentOff: 0,
- repacked: fn.repacked,
- }
- }
- n, f.ptr, err = f.inode.Write(p, f.ptr)
- return
-}
-
-func (f *filehandle) Readdir(count int) ([]os.FileInfo, error) {
- if !f.inode.IsDir() {
- return nil, ErrInvalidOperation
- }
- if count <= 0 {
- return f.inode.Readdir(), nil
- }
- if f.unreaddirs == nil {
- f.unreaddirs = f.inode.Readdir()
- }
- if len(f.unreaddirs) == 0 {
- return nil, io.EOF
- }
- if count > len(f.unreaddirs) {
- count = len(f.unreaddirs)
- }
- ret := f.unreaddirs[:count]
- f.unreaddirs = f.unreaddirs[count:]
- return ret, nil
-}
-
-func (f *filehandle) Stat() (os.FileInfo, error) {
- return f.inode.FileInfo(), nil
-}
-
-func (f *filehandle) Close() error {
- return nil
-}
-
type dirnode struct {
treenode
client *Client
projects / arvados.git / commitdiff