vfs/node.go

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/*
* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
* Author: Alex Yatskov <alex@foosoft.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package main
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import (
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"bazil.org/fuse"
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"fmt"
"os"
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"syscall"
"time"
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)
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type versionedNode struct {
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path string
info os.FileInfo
ver *version
shadow *versionedNode
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}
type versionedNodeMap map[string]*versionedNode
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func newVersionedNode(path string, ver *version) (*versionedNode, error) {
info, err := os.Stat(ver.rebasePath(path))
if err != nil {
return nil, err
}
return newVersionedNodeStat(path, ver, info), nil
}
func newVersionedNodeStat(path string, ver *version, info os.FileInfo) *versionedNode {
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return &versionedNode{path, info, ver, nil}
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}
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func (this *versionedNode) setAttr(req *fuse.SetattrRequest, resp *fuse.SetattrResponse) error {
if req.Valid&fuse.SetattrMode != 0 {
if err := os.Chmod(this.rebasedPath(), req.Mode); err != nil {
return err
}
}
if setGid, setUid := req.Valid&fuse.SetattrGid != 0, req.Valid&fuse.SetattrUid != 0; setGid || setUid {
gid, uid := this.owner()
if setGid {
gid = req.Gid
}
if setUid {
uid = req.Uid
}
if err := os.Chown(this.rebasedPath(), int(uid), int(gid)); err != nil {
return err
}
}
if setAtime, setMtime := req.Valid&fuse.SetattrAtime != 0, req.Valid&fuse.SetattrMtime != 0; setAtime || setMtime {
atime, mtime, _ := this.times()
if setAtime {
atime = req.Atime
}
if setMtime {
mtime = req.Mtime
}
if err := os.Chtimes(this.rebasedPath(), atime, mtime); err != nil {
return err
}
}
if err := this.updateInfo(); err != nil {
return err
}
this.attr(&resp.Attr)
return nil
}
func (this *versionedNode) updateInfo() error {
info, err := os.Stat(this.rebasedPath())
if err != nil {
return err
}
this.info = info
return nil
}
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func (this *versionedNode) rebasedPath() string {
return this.ver.rebasePath(this.path)
}
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func (this *versionedNode) owner() (gid, uid uint32) {
stat := this.info.Sys().(*syscall.Stat_t)
gid = stat.Gid
uid = stat.Uid
return
}
func (this *versionedNode) times() (atime, mtime, ctime time.Time) {
stat := this.info.Sys().(*syscall.Stat_t)
atime = time.Unix(int64(stat.Atim.Sec), int64(stat.Atim.Nsec))
mtime = this.info.ModTime()
ctime = time.Unix(int64(stat.Ctim.Sec), int64(stat.Ctim.Nsec))
return
}
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func (this *versionedNode) attr(attr *fuse.Attr) {
stat := this.info.Sys().(*syscall.Stat_t)
attr.Size = uint64(this.info.Size())
attr.Blocks = uint64(stat.Blocks)
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attr.Atime, attr.Mtime, attr.Ctime = this.times()
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attr.Mode = this.info.Mode()
attr.Nlink = uint32(stat.Nlink)
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attr.Gid, attr.Uid = this.owner()
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attr.Rdev = uint32(stat.Rdev)
}
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func (this *versionedNode) String() string {
return fmt.Sprintf("%s (%s)", this.path, this.rebasedPath())
}