Useful tools missing from /rescue

[Yar Tikhiy]

On Mon, Sep 03, 2007 at 03:18:03AM +0300, Giorgos Keramidas wrote:
> On 2007-09-02 11:18, Tim Kientzle <kientzle at freebsd.org> wrote:
> > Yar Tikhiy wrote:
> >> In addition, there are chflags and chmod in /rescue, but there's no
> >> chown in it, so the toolset is a bit incomplete.
> >
> > Oh, my.  chown was definitely an oversight.  That
> > should have been in there.
> 
> Probably because chown is a relatively big binary.  If build as a static
> binary here, it ends up being:
> 
> $ pwd
> /home/keramida/bsd/src/usr.sbin/chown
> $ make DEBUG_FLAGS='' NO_SHARED=yes all
> [...]
> $ ls -ld chown
> -rwxrwxr-x    1 keramida  users  - 2297013 Sep  3 03:06 chown
> $ strip -s chown
> $ ls -ld chown
> -rwxrwxr-x    1 keramida  users  - 550624 Sep  3 03:06 chown
> $
> 
> This will get smaller when crunched, but it's still almost 4x the size
> of chmod:
> 
> $ pwd
> /home/keramida/bsd/src/bin/chmod
> $ make DEBUG_FLAGS='' NO_SHARED=yes all
> [...]
> $ ls -ld chmod
> -rwxrwxr-x  1 keramida  users  - 662678 Sep  3 03:08 chmod
> $ strip -s chmod
> $ ls -ld chmod
> -rwxrwxr-x  1 keramida  users  - 165884 Sep  3 03:08 chmod
> $
> 
> Running nm(1) on the binaries, I see that they have the same symbols
> though:
> 
> $ nm -S chmod | awk '{print $2,$3,$4}' | sort > /tmp/symbols.chmod
> $ nm -S chown | awk '{print $2,$3,$4}' | sort > /tmp/symbols.chown
> $ diff -u /tmp/symbols.chmod /tmp/symbols.chown
> $
> 
> Does this mean that adding chown to the already crunched binary will not
> cause a lot of bloat because of symbols/functions private to chown?

The difference in the static binary sizes is weird, but I don't
have time now to dig the issue deeper, sorry.  The rescue binary
grows just slightly when chown is added to it:

-r-xr-xr-x  121 root  wheel  3715096  1 сен 10:22 /rescue.old/rescue
-r-xr-xr-x  122 root  wheel  3718192  3 сен 17:17 /rescue/rescue

-- 
Yar