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Bug#270285: dosemu: unix.com -s fails to import env vars with an underscore

Ryan Underwood <nemesis@icequake.net> writes:

> On Mon, Sep 06, 2004 at 03:25:39PM +0100, Roger Leigh wrote:
>> Package: dosemu
>> Version: 1.2.1-3
>> Severity: normal
>> 
>> If I want to import environment variables from the Linux environment
>> into the dosemu session using "unix -s varname", only variables without
>> an underscore are imported.
>
> I did the exactly same thing as you, and here are my results:
[snip working results]

Hmm, that's interesting!

> But, these environment vars are not set in the parent shell, because a
> new shell is spawned to run the .bat file and then destroyed when it
> exits.

That's not a problem--they weren't even set within the current shell.

> The only other thing I can think of is that empty environment variables
> are automatically reaped under DOS.  So if you try to import a variable
> that exists on the unix side but is empty, nothing will appear to
> happen, because it has the same effect as SET FOO= on the DOS side.

That's what I see, but if the variable /is/ set, the behaviour of
"unix -s" is different whether it's run from (autoexec.bat or a
command specified on the dosemu command line) compared with being run
from the command prompt by hand (which works perfectly).

>> I've also found problems if DOSCOMMAND has arguments to the command e.g.
>> "command arg1 arg2".  The args seem to be dropped, though I need to
>> investigate this one further.  This also applies to running "dosemu
>> command arg1 arg2" with the appropriate unix command in autoexec.bat.
>
> Hmm, this definitely doesn't happen here (or else it would be impossible
> to invoke the permanent shell option).  However, I am using a FreeCOM
> from here:
> http://freedos.sourceforge.net/freecom/FreeCOM.html#-download
> instead of the classic dosemu comcom, which you probably use because it
> is the default command interpreter in dosemu 1.2.

Yes--it's the stock dosemu and dosemu-freedos from unstable.  I can't
say I like it (it says "out of memory" when it can't find a command!).

> Just take the
> command.com from the distribution and replace the command.com link in
> /usr/lib/freedos with it.

I tried this.  I renamed command.com to command.swp and vspawn.com to
command.com.  It won't work unless command.swp is read-write!  When I
do start it, either from config.sys or from the comcom.com shell,
"unix -s" fails to work (and I lose the shell history), so something's
not quite right there!

Update: not using vspawn, and making command.com writable lets it run
normally and "unix -s" does then work as expected, but it's still not
quite right:

$ export
declare -x BAR="bar"
declare -x BAZ="baz"
declare -x CSL_ACC="3453"
declare -x CSL_COMMAND="dsfs  dfdfdfdfdfdfd /dfdfd"
declare -x CSL_CSBIG="dskf dskf sdf dsf dsfdf dsf dsf"
declare -x CSL_CSNRM="dskf dskf sdf dsf dsfdf dsf dsf"
declare -x FOO="foo"
declare -x FOO_BAR="foobar"
declare -x FOO_BAZ="foobaz"

$ cat test2.bat
UNIX -S FOO
UNIX -S FOO
UNIX -S BAR
UNIX -S BAZ
UNIX -S FOO_BAR
UNIX -S FOO_BAZ
UNIX -S CSL_ACC
UNIX -S CSL_CSNRM
UNIX -S CSL_CSBIG
UNIX -S CSL_COMMAND
SET
PAUSE

$ dosemu
C:\>d:\test2
D:\>UNIX -S FOO
D:\>UNIX -S FOO
D:\>UNIX -S BAR
D:\>UNIX -S BAZ
D:\>UNIX -S FOO_BAR
D:\>UNIX -S FOO_BAZ
D:\>UNIX -S CSL_ACC
D:\>UNIX -S CSL_CSNRM
D:\>UNIX -S CSL_CSBIG
D:\>UNIX -S CSL_COMMAND
D:\>SET
PATH=c:\bin;c:\gnu;c:\dosemu
COMSPEC=C:\FREECOM\COMMAND.COM
HELPPATH=c:\help
PROMPT=$P$G
DOSTMP=/tmp/dosemu.vapgkb/tmp
DOSDRIVE_D=/home/roger
DOSEMU_VERSION=1.2.1.0
FOO=foo
BAR=bar
BAZ=baz
FOO_BAR=foobar
FOO_BAZ=foobaz
CSL_ACC=3453
CSL_CSNRM=dskf dskf sdf dsf dsfdf dsf dsf
CSL_CSBIG=dskf dskf sdf dsf dsfdf dsf dsf
CSL_COMMAND=dsfs  dfdfdfdfdfdfd /dfdfd

All of the env vars are there.  Now:

$ dosemu d:\\test2
C:\>SET
[same commands as before]
PATH=c:\bin;c:\gnu;c:\dosemu
COMSPEC=C:\FREECOM\COMMAND.COM
HELPPATH=c:\help
PROMPT=$P$G
DOSTMP=/tmp/dosemu.jsddnx/tmp
DOSDRIVE_D=/home/roger
DOSEMU_VERSION=1.2.1.0
FOO=foo
BAR=bar
BAZ=baz
FOO_BAR=foobar
FOO_BAZ=foobaz
CSL_ACC=3453

Notice that the CSL_CSNRM, CSL_CSBIG and CSL_COMMAND vars are now
missing.  test2.bat was invoked by this line in autoexec.bat:

unix -e

> so eventually it will be necessary to add FreeCOM to the dosemu-freedos
> package.

That sounds great.


Regards,
Roger

-- 
Roger Leigh

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