Re: bash bug?: nested "bash --login -i" doesn't run /etc/profile (still runs ~/.bash_profile)

[Daniel Barclay <daniel at fgm dot com>]

Larry Hall (Cygwin) wrote:
> On 10/5/2010 10:12 AM, Daniel Barclay wrote:
> > Larry Hall (Cygwin) wrote:
> > > On 10/4/2010 12:19 PM, Daniel Barclay wrote:
...
> > > > Can anyone confirm (or "anti-confirm") this behavior?:
...
> > > > > When bash is started using the Cygwin shortcut (which runs cygwin.bat,
> > > > > which executes "bash --login -i"), bash reads files /etc/profile and
> > > > > ~/.bash_profile. (Running "bash --login -i" from an interactive
> > > > > "cmd" shell does the same.)
> > > > >
> > > > > However, when in that first bash process, another bash is started with
> > > > > that same "bash --login -i" command, bash does _not_ read
> > > > > /etc/profile.
> > >
> > > Works for me.
> >
> > How did you detect that that second bash runs /etc/profile?
>
> I added "set -x" to the file so it would show me when it was running.

Thanks.  Hey, did you do that in addition to all my "steps to reproduce"
(re-quoted below) or instead of some of them (in particular, setting
SHELLOPTS)?

I ask because I wonder if the problem is somewhere in or nears bash's
startup code that reads SHELLOPTS, because we both turned on the
"set -x"/"xtrace" tracing, but got different results--and there might
be a difference in how we turned on that tracing.

(I'll also check with just "set -x" and without setting SHELLOPTS.


For your convenience, here's a "requote" of the SHELLOPTS behavior I
saw and my "Steps to reproduce" paragraph:

---------------------------------------------
A root invocation notices "igncr", "verbose", and "xtrace" in the
SHELLOPTS value from its invocation environment (the Windows/cmd
environment variable) as specified--it ends up setting SHELLOPTS in
itself to a value that includes those options.

On the other hand, a nested invocation seems to ignore the SHELLOPTS
from its invocation environment (the environment variable from the
first bash shell/process)--it sets its SHELLOPTS to a value that does
_not_ include those options.)


Steps to reproduce (and easily see difference):

1. Set Windows environment variable SHELLOPTS to
   "igncr:verbose:xtrace".
2. Start bash using the installer-created Cygwin shortcut.
3. Notice (from the output from the "verbose" and "xtrace" options)
   that bash runs /etc/profile and then ~/.bash_profile.
4. Notice (from "set") that SHELLOPTS in bash includes "igncr",
   "verbose" and "xtrace" (among other options).
5. Execute "bash --login -i".
6. Notice (again, from the verbose/xtrace output) that bash does
   _not_ run /etc/profile, but still runs ~/.bash_profile.
7. Notice that SHELLOPTS in that invocation of bash does not include
   "igncr", "verbose" or "xtrace". ---

---------------------------------------------


Thanks.

Daniel

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