Is there a namei utility in FreeBSD?

[Trond Endrestøl]

On Mon, 6 Mar 2017 11:43-0500, James E Keenan wrote:

> On 03/06/2017 11:02 AM, Anton Yuzhaninov wrote:
> > On 03/06/17 09:12, James E Keenan wrote:
> > > In Linux, there is a userland utility 'namei' which enables a user to
> > > "follow a pathname until a terminal point is found".  Invoking it on,
> > > say, a symlink produces output like this:
> > 
> > If you need to find a target of symlink (or symlink chain) you can use
> > realpath(1).
> 
> Thanks for mentioning that.  However, while the example I gave was that of a
> symlink, and while both namei and realpath are good for displaying information
> about symlinks, my central question was whether there was an equivalent to
> namei in FreeBSD.  namei identifies the nature of each component in the
> resolved path; realpath does not.

I couldn't resist creating my own version of namei(1). This one is BSD 
two-clause licensed, and I swear I only looked at the two URLs 
mentioned in the comments and the many man pages of FreeBSD.

http://ximalas.info/~trond/namei/c/namei.c

The code is a mess and I don't know if the output matches the original 
beyond what was presented in this thread. Bugs are probably in 
abundance, and the -v flag isn't implemented yet.

The code does work to some extent:

$ namei /etc/rc.d/local_unbound
f: = /etc/rc.d/local_unbound
 d /
 d etc
 d rc.d
 - local_unbound

$ namei /sys/amd64/conf/GENERIC
f: = /sys/amd64/conf/GENERIC
 d /
 l sys -> usr/src/sys
   d usr
   d src
   d sys
   d amd64
   d conf
   - GENERIC

$ namei -l /sys/i386/conf/GENERIC
f: = /sys/i386/conf/GENERIC
 drwxr-xr-x root wheel /
 lrwxr-xr-x root wheel sys -> usr/src/sys
            drwxr-xr-x root wheel usr
            drwxr-xr-x root wheel src
            drwxr-xr-x root wheel sys
            drwxr-xr-x root wheel i386
            drwxr-xr-x root wheel conf
            -rw-r--r-- root wheel GENERIC

Happy hacking.

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