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list.go
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list.go
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package filesystem
import (
"fmt"
"io"
"path"
"runtime"
"syscall"
"time"
"github.com/Cloud-Foundations/Dominator/lib/filter"
)
const (
timeFormat string = "02 Jan 2006 15:04:05 MST"
symlinkMode = syscall.S_IFLNK | syscall.S_IRWXU | syscall.S_IRWXG |
syscall.S_IRWXO
)
func (fs *FileSystem) list(w io.Writer, listSelector ListSelector,
filter *filter.Filter) error {
defer runtime.GC()
numLinksTable := buildNumLinksTable(fs)
return fs.DirectoryInode.list(w, "/", numLinksTable, 1, listSelector,
filter)
}
func buildNumLinksTable(fs *FileSystem) NumLinksTable {
numLinksTable := make(NumLinksTable)
fs.DirectoryInode.scanDirectory(fs, numLinksTable)
return numLinksTable
}
func (inode *DirectoryInode) scanDirectory(fs *FileSystem,
numLinksTable NumLinksTable) {
for _, dirent := range inode.EntryList {
numLinksTable[dirent.InodeNumber]++
if inode, ok := dirent.Inode().(*DirectoryInode); ok {
inode.scanDirectory(fs, numLinksTable)
}
}
}
func (inode *DirectoryInode) list(w io.Writer, name string,
numLinksTable NumLinksTable, numLinks int,
listSelector ListSelector, filter *filter.Filter) error {
if err := listUntilName(w, inode.Mode, numLinks, inode.Uid, inode.Gid,
0, -1, -1, name, true, listSelector); err != nil {
return err
}
for _, dirent := range inode.EntryList {
pathname := path.Join(name, dirent.Name)
if filter != nil && filter.Match(pathname) {
continue
}
err := dirent.inode.List(w, pathname, numLinksTable,
numLinksTable[dirent.InodeNumber], listSelector, filter)
if err != nil {
return err
}
}
return nil
}
func (inode *RegularInode) list(w io.Writer, name string,
numLinksTable NumLinksTable, numLinks int,
listSelector ListSelector) error {
if err := listUntilName(w, inode.Mode, numLinks, inode.Uid, inode.Gid,
inode.Size, inode.MtimeSeconds, inode.MtimeNanoSeconds, name, false,
listSelector); err != nil {
return err
}
var err error
if inode.Size > 0 && listSelector&ListSelectSkipData == 0 {
_, err = fmt.Fprintf(w, " %x\n", inode.Hash)
} else {
_, err = io.WriteString(w, "\n")
}
return err
}
func (inode *ComputedRegularInode) list(w io.Writer, name string,
numLinksTable NumLinksTable, numLinks int,
listSelector ListSelector) error {
if err := listUntilName(w, inode.Mode, numLinks, inode.Uid, inode.Gid,
0, -1, -1, name, false, listSelector); err != nil {
return err
}
var err error
if listSelector&ListSelectSkipData == 0 {
_, err = fmt.Fprintf(w, " <- %s\n", inode.Source)
} else {
_, err = io.WriteString(w, "\n")
}
return err
}
func (inode *SymlinkInode) list(w io.Writer, name string,
numLinksTable NumLinksTable, numLinks int,
listSelector ListSelector) error {
if err := listUntilName(w, symlinkMode, numLinks, inode.Uid, inode.Gid,
0, -1, -1, name, false, listSelector); err != nil {
return err
}
var err error
if listSelector&ListSelectSkipData == 0 {
_, err = fmt.Fprintf(w, " -> %s\n", inode.Symlink)
} else {
_, err = io.WriteString(w, "\n")
}
return err
}
func (inode *SpecialInode) list(w io.Writer, name string,
numLinksTable NumLinksTable, numLinks int,
listSelector ListSelector) error {
return listUntilName(w, inode.Mode, numLinks, inode.Uid, inode.Gid,
inode.Rdev, inode.MtimeSeconds, inode.MtimeNanoSeconds, name, true,
listSelector)
}
func listUntilName(w io.Writer, mode FileMode, numLinks int, uid uint32,
gid uint32, data uint64, seconds int64, nanoSeconds int32, name string,
newline bool, listSelector ListSelector) error {
if listSelector&ListSelectSkipMode == 0 {
if _, err := io.WriteString(w, mode.String()+" "); err != nil {
return err
}
}
if listSelector&ListSelectSkipNumLinks == 0 {
if _, err := fmt.Fprintf(w, "%3d ", numLinks); err != nil {
return err
}
}
if listSelector&ListSelectSkipUid == 0 {
if _, err := fmt.Fprintf(w, "%5d ", uid); err != nil {
return err
}
}
if listSelector&ListSelectSkipGid == 0 {
if _, err := fmt.Fprintf(w, "%5d ", gid); err != nil {
return err
}
}
if listSelector&ListSelectSkipSizeDevnum == 0 {
var err error
switch mode & syscall.S_IFMT {
case syscall.S_IFREG:
if data == 0 && seconds < 0 && nanoSeconds < 0 {
_, err = fmt.Fprintf(w, "%10s ", "computed")
} else {
_, err = fmt.Fprintf(w, "%10d ", data)
}
case syscall.S_IFBLK, syscall.S_IFCHR:
_, err = fmt.Fprintf(w, "%#10x ", data)
default:
_, err = fmt.Fprintf(w, "%11s", "")
}
if err != nil {
return err
}
}
if listSelector&ListSelectSkipMtime == 0 {
var err error
if seconds == -1 && nanoSeconds == -1 {
_, err = fmt.Fprintf(w, "%25s", "")
} else {
t := time.Unix(seconds, int64(nanoSeconds))
_, err = io.WriteString(w, t.Format(timeFormat)+" ")
}
if err != nil {
return err
}
}
if listSelector&ListSelectSkipName == 0 {
if _, err := io.WriteString(w, name); err != nil {
return err
}
}
if newline {
_, err := io.WriteString(w, "\n")
return err
}
return nil
}
func (mode FileMode) string() string {
var buf [10]byte
w := 1
const rwx = "rwxrwxrwx"
for i, c := range rwx {
if mode&(1<<uint(9-1-i)) != 0 {
buf[w] = byte(c)
} else {
buf[w] = '-'
}
w++
}
switch mode & syscall.S_IFMT {
case syscall.S_IFSOCK:
buf[0] = 's'
case syscall.S_IFLNK:
buf[0] = 'l'
case syscall.S_IFREG:
buf[0] = '-'
case syscall.S_IFBLK:
buf[0] = 'b'
case syscall.S_IFDIR:
buf[0] = 'd'
case syscall.S_IFCHR:
buf[0] = 'c'
case syscall.S_IFIFO:
buf[0] = 'p'
default:
buf[0] = '?'
}
if mode&syscall.S_ISUID != 0 {
if mode&syscall.S_IXUSR == 0 {
buf[3] = 'S'
} else {
buf[3] = 's'
}
}
if mode&syscall.S_ISGID != 0 {
if mode&syscall.S_IXGRP == 0 {
buf[6] = 'S'
} else {
buf[6] = 's'
}
}
if mode&syscall.S_ISVTX != 0 {
if mode&syscall.S_IXOTH == 0 {
buf[9] = 'T'
} else {
buf[9] = 't'
}
}
return string(buf[:])
}