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Subject: RE: a possible bug in Exec ?
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Date: Thu, 12 Oct 2000 12:11:49 -0700
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Thread-Topic: a possible bug in Exec ?
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From: "Mahlen Morris" <mmorris@yaltacomm.com>
To: <ant-user@jakarta.apache.org>
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Also, while I haven't tried it, past experience indicates that an exec
on 'cmd /c dir' would be equivalent to doing dir in the command line.
'cmd' is the name of the NT command shell, and '/C' means "Carries out
the command specified by string and then terminates" (from 'help cmd').
=20
mahlen
=20
The horror of the Twentieth Century is the size of each event and the
paucity of its reverberation.
        --Norman Mailer

-----Original Message-----
From: rwaldhof@us.britannica.com [mailto:rwaldhof@us.britannica.com]
Sent: Thursday, October 12, 2000 12:06 PM
To: ant-user@jakarta.apache.org
Subject: RE: a possible bug in Exec ?



"dir" is a command of the DOS shell (just like "ls" is usually defined
within your Unix shell), not of the operating system itself.  If you
want to do a "dir", one way to do it is to create a batch file than runs
it:

_file: foo.bat_=20
dir=20

and run=20

<exec dir=3D"." command=3D"foo.bat" os=3D"Windows NT" output=3D"dir.txt" =
/>=20

You could also create a generic batch shell, like:=20

_file: dynamic.bat_=20
%1 %2 %3 %4 %5 %6 %7 %8 %9=20

and use it for arbitrary DOS commands:=20

<exec dir=3D"." command=3D"dynamic.bat dir /w" os=3D"Windows NT"
output=3D"dir.txt" />=20

This isn't a bug in Ant, or even java.lang.Runtime.exec(), but rather a
"feature" of the relation between operating systems and shells.


-----Original Message-----=20
From: Andy XueWen Qin [ mailto:aqin@cisco.com <mailto:aqin@cisco.com> ]=20
Sent: Thursday, October 12, 2000 12:34 PM=20
To: ant-user@jakarta.apache.org=20
Subject: a possible bug in Exec ?=20


I'm trying to use exec task on Windows NT, it's very simple=20
test build.xml file, but giving out a strange error. When I=20
change the dir=3D"." to dir=3D"..", it works fine, any ideas ?=20
The ant version I'm using is Ant1.1.=20
-----------=20
build.xml=20
------------=20
<?xml version=3D"1.0" ?>=20
<project name=3D"test" default=3D"dist" basedir=3D".">=20
  <target name=3D"dist" >=20
    <exec dir=3D"." command=3D"dir" os=3D"Windows NT" output=3D"dir.txt" =
/>=20
  </target>=20
</project>=20
------------=20
error message:=20
-----------=20
build.xml:4: Error exec: dir=20
java.io.IOException: CreateProcess: dir error=3D2=20
        at java.lang.Win32Process.<init>(Compiled Code)=20
        at java.lang.Runtime.exec(Compiled Code)=20
        at java.lang.Runtime.exec(Runtime.java:137)=20
        at org.apache.tools.ant.taskdefs.Exec.run(Exec.java:124)=20
        at org.apache.tools.ant.taskdefs.Exec.execute(Exec.java:77)=20
        at org.apache.tools.ant.Target.execute(Compiled Code)=20
        at org.apache.tools.ant.Project.runTarget(Project.java:717)=20
        at org.apache.tools.ant.Project.executeTarget(Compiled Code)=20
        at org.apache.tools.ant.Project.executeTargets(Compiled Code)=20
        at org.apache.tools.ant.Main.runBuild(Compiled Code)=20
        at org.apache.tools.ant.Main.main(Main.java:107)=20

Total time: 0 seconds=20
------------------------=20

Thanks=20
/andy=20