在OS X Shell脚本中，如何从其inode获取文件路径？

Question

I have a list of files as :<volume name>:<directory inode>:<file name> . For example, :Foo:33103829:IMG_2837.JPG . How can I get the file path?

I found an answer here that looks to be exactly what I want, but I can't get it to work. The answer says that on OS X there is a 'magic' directory /.vol that works on inodes. ls tells me that /.vol exists, but doesn't contain anything, even when accessed by inodes:

# verify that /.vol exists:
~$ ls -ld /.vol
drwxr-xr-x@ 2 root  wheel  68 May 18  2009 /.vol/

# get inode of volume Foo
~$ ls -id /Volumes/Foo
32659974 /Volumes/Foo@

# access volume Foo by idnode
~$ ls /.vol/32659974
ls: /.vol/32659974: No such file or directory

# access volume Foo by idnode
~$ cd /.vol/32659974
cd: /.vol/32659974: No such file or directory

# access volume by inode using GetFileInfo
~$ GetFileInfo /.vol/32659974
GetFileInfo: could not refer to file (-43)

Answer 1

Turns out the problem is that I was getting the inode number of the volume from ls -i which isn't usable to access via /.vol , which needs the device ID. When I instead get the device ID of the volume using stat (as I saw in an answer here ), it works.

# ls -id returns inode as '32659974'
~$ ls -id /Volumes/Foo
32659974 /Volumes/Foo@

# stat returns device ID as '234881026' and confirms inode is '32659974'
~$ stat /Volumes/Foo
234881026 32659974 lrwxr-xr-x 1 root admin 0 1 "Sep 16 14:31:52 2014" "Sep 16 14:31:52 2014" "Sep 16 14:31:52 2014" "Sep 16 14:31:52 2014" 4096 8 0 /Volumes/Foo

# access file using ./vol/<device ID>/<inode>
~$ cd /.vol/234881026/1017800
:../Prague 2011 March$

Answer 2

You can use this script

#!/bin/sh
export PATH=/bin:/usr/bin
while IFS=: read -r vol inode name
do
    [[ -e "/Volumes/$vol" ]] || continue
    eval $(stat -s "/Volumes/$vol")
    fpath=$(GetFileInfo "/.vol/$st_dev/$inode" | perl -ne 'print "$2\n" if m/^(directory|file):\s*"(.*)"/;')
    printf "%s:%s:%s:%s" "$vol" $inode "$name" "$fpath"
    bname=$(basename "$fpath")
    [[ "$bname" == "$name" ]] && printf "\n" || printf " #DIFF NAMES\n"
done

• save it as v2p.sh
• chmod 755 v2p.sh
• use it as ./v2p.sh < your_input_file >output_file

from the input like

jhdd:60533283:aliases
jhdd:60526259:apache2
Tunnelblick Uninstaller:19:Online Documentation.webloc
jhdd:68032325:auto_smb
jhdd:60526617:bashrc

produces

jhdd:60533283:aliases:/private/etc/postfix/aliases
jhdd:60526259:apache2:/private/etc/apache2
Tunnelblick Uninstaller:19:Online Documentation.webloc:/Volumes/Tunnelblick Uninstaller/Online Documentation.webloc
jhdd:68032325:auto_smb:/private/etc/auto_smb
jhdd:60526617:bashrc:/private/etc/bashrc

eg adds the path to the end as an new colon delimited field