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From: Bertrand Delacretaz <bdelacretaz@apache.org>
Subject: Use of the what command with java code (was: Including source files
 in jars)
Date: Tue, 8 Jun 2004 09:01:50 +0200
To: dev@cocoon.apache.org

Le 8 juin 04, =E0 08:32, Sylvain Wallez a =E9crit :
> ...You can know when the build was done by looking at the class files=20=

> creation date in the jars, but you cannot know what sources were used=20=

> to produce them, except that they're older than the build. But how=20
> much older? Was the checkout done a day before or a week? Also, was it=20=

> a full cvs update or only a partial one (e.g. on a particular=20
> block)?...

In the Good Old Times (C++ programming under unix) we were using the=20
"what" command to tell us from which versions of source files our=20
binaries were built (see "man what" for more info if you're running a=20
decent platform) (I know I'll get flamed for saying "decent" ;-)

A quick test shows that this works with java as well, using unzip -p to=20=

decompress jars before letting "what" process their content.

g4:/tmp> cat A.java
class A {
         public static final String WHAT_ID =3D "@(#)$Id: A.java,v 1.3=20=

1999/07/08 14:16:07 sylvain Exp $";
         public static void main(String args[]) {
                 System.out.println(WHAT_ID);
         }
}

g4:/tmp> javac A.java
g4:/tmp> what A.class
A.class
         $Id: A.java,v 1.3 1999/07/08 14:16:07 sylvain Exp $

g4:/tmp> jar cvf a.jar A.class
. . .
g4:/tmp> unzip -p a.jar | what
         $Id: A.java,v 1.3 1999/07/08 14:16:07 sylvain Exp $

So I think, by simply adding WHAT_ID strings to our source files we=20
could have this info without having to include source code in jars (but=20=

of course, your solution works *now* ;-)

-Bertrand