On Monday 08 June 2009 05:15:26 Denys Vlasenko wrote:
> On Mon, Jun 8, 2009 at 4:02 AM, Barney Barumba<[email protected]> wrote:
> > On Fri, 5 Jun 2009, Denys Vlasenko wrote:
> >> Pretty sure I met this problem ages ago.
> >>
> >> The PATH is not exported. God alone knows why not, but it isn't.
> >>
> >> Add the line
> >>
> >> export PATH
> >>
> >> to /etc/profile and you might be in luck.
> >
> > Still not sure what was causing it, but the problem only occurred when
> > I executed a shell directly from the /init script. When I link /init to
> > /bin/busybox and launch a shell from /etc/inittab everything works fine.
> >
> > I was only using the /init shell for testing while building the system,
> > so for me this is not really a problem any more. I'll try exporting the
> > path though just to see if that works, and let you know.
>
> My theory is with PATH unset, a default PATH is used by libc,
> and was finding run-parts.
Close. If PATH is unset, a default PATH is supplied by your command shell.
(And lots of things exec stuff through system() which bounces off a shell.)
In busybox's case (for ash, anyway), it's a hidden and torturous code path
that eventually winds up in libbb/messages.c with:
const char bb_PATH_root_path[] ALIGN1 =
"PATH=/sbin:/usr/sbin:/bin:/usr/bin" BB_ADDITIONAL_PATH;
I thought the original reason for "messages.c" was to contralize strings that
might be translated into foreign languages, which doesn't seem like something
you'd want to do to a search path. Expecially not one that has a standard
definition we're not using: I have no idea why we're not just #including
/usr/include/paths.h out of the standard headers and using _PATH_STDPATH, but
oh well. Could be worse. I have the bash 2.05b sources here and _they_ have
(in config-top.h):
/* The default value of the PATH variable. */
#ifndef DEFAULT_PATH_VALUE
#define DEFAULT_PATH_VALUE \
"/usr/gnu/bin:/usr/local/bin:/usr/ucb:/bin:/usr/bin:."
#endif
Which is _hilariously_ bad, but very FSF. (I don't even what to _know_ what
bash 3.x is doing...)
Rob
--
Latency is more important than throughput. It's that simple. - Linus Torvalds
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