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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 17721] - problem with wrapper shell script if $0 is a relative symlink
Date Tue, 25 Mar 2003 14:45:54 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=17721

problem with wrapper shell script if $0 is a relative symlink





------- Additional Comments From martin@macrospace.com  2003-03-25 14:45 -------
The version from CVS HEAD gives me the same problem.

Other parts of the script have changed, but the problematic test is the same.

The problem is with the test at line 54 in HEAD:

	expr "$link" : '.*/.*'

This is supposed to test if $link is an absolute path. However, what it
actually tests is if $link contains a '/' character (rather than if it
starts with a '/').

I also got it to work by changing this test to:

	expr "$link" : '^/.*'

This is a smaller change than my other proposed fix.

Here is an extract from the output of "sh -x ~/bin/ant" on Solaris 8 (sparc),
with the script from HEAD:

[...]
PRG=/export/home/martin/bin/ant
+ basename /export/home/martin/bin/ant 
progname=ant
+ [ -h /export/home/martin/bin/ant ] 
+ ls -ld /export/home/martin/bin/ant 
ls=lrwxrwxrwx   1 martin         22 Mar 25 14:18 /export/home/martin/bin/ant ->
../install/ant/bin/ant
+ expr lrwxrwxrwx   1 martin         22 Mar 25 14:18 /export/home/martin/bin/ant
-> ../install/ant/bin/ant : .*-> \(.*\)$ 
link=../install/ant/bin/ant
+ expr ../install/ant/bin/ant : .*/.* 
PRG=../install/ant/bin/ant
+ [ -h ../install/ant/bin/ant ] 
+ dirname ../install/ant/bin/ant 
ANT_HOME=../install/ant/bin/..
+ cd ../install/ant/bin/.. 
/export/home/martin/bin/ant: ../install/ant/bin/..: does not exist
ANT_HOME=
[...]

I've also reproduced the bug on Linux (Cobalt Linux, which I think is based
on RedHat 5 point something), again with the script from HEAD:

[...]
+ PRG=/home/sites/home/users/martin/bin/ant
++ basename /home/sites/home/users/martin/bin/ant
+ progname=ant
+ [ -h /home/sites/home/users/martin/bin/ant ]
++ ls -ld /home/sites/home/users/martin/bin/ant
+ ls=lrwxrwxrwx   1 martin   users          22 Mar 25 13:12
/home/sites/home/users/martin/bin/ant -> ../install/ant/bin/ant
++ expr lrwxrwxrwx   1 martin   users          22 Mar 25 13:12
/home/sites/home/users/martin/bin/ant -> ../install/ant/bin/ant : .*-> \(.*\)$
+ link=../install/ant/bin/ant
+ expr ../install/ant/bin/ant : .*/.*
+ PRG=../install/ant/bin/ant
+ [ -h ../install/ant/bin/ant ]
++ dirname ../install/ant/bin/ant
+ ANT_HOME=../install/ant/bin/..
++ cd ../install/ant/bin/..
/home/sites/home/users/martin/bin/ant: ../install/ant/bin/..: No such file or
directory
+ ANT_HOME=
[...]

Setting ANT_HOME before running the script does work around the problem
(because the test in question never gets run). Maybe this is why you can't
reproduce it.

Does "env - ~/bin/ant" work for you?

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