From: Tobias DiPasquale <anany@...>
Date: 2001-12-09T03:49:44+09:00
Subject: [ruby-talk:27963] stack overflow (was Ruby IDE?? What about using Eclipse??)

Hi all,

	Hearing all about this Eclipse project made me go and pull it down, until 
I realized that I had it already. So I unzipped it, and like a few 
select annoying packages that I get from time to time, it installed 
everything world-writeable. I was so mad that I wrote this Ruby script 
(below) to change all the permissions back to 755/644 depending on the 
file type. However, the following script always ends up erroring out 
(error below). Is it just because the directory is too deep, or is there 
an error in my recursion? Any help would be appreciated. Thanks in advance!

======================= Code ========================
#!/usr/bin/env ruby

def fixPermissions(filename)
   if FileTest.directory?(filename)
     File.chmod(0755, filename)
     printf "%s: changed to 0755\n", filename
   else
     if filename =~ /.sh$/ || filename =~ /.so$/
       File.chmod(0755, filename)
       printf "%s: changed to 0755\n", filename
     else
       File.chmod(0644, filename)
       printf "%s: changed to 0644\n", filename
     end
   end
end

def traverseDirectory(files)
   files.each { |aFile|
     if FileTest.directory?(aFile) && (aFile != "." || aFile != "..")
       traverseDirectory(Dir.entries(aFile))
       puts "Entering directory " + aFile
     else
       fixPermissions(aFile)
     end
   }
end

if __FILE__ == $0
   if ARGV.size != 1
     puts "Usage: permfix <directory>"
     exit
   end

   if !FileTest.exist? ARGV[0]
     puts "Error: directory " + ARGV[0] + " does not exist!"
     exit
   end

   if !FileTest.directory? ARGV[0]
     puts "Error: " + ARGV[0] + " is not a directory!"
     exit
   end

   traverseDirectory Dir.entries(ARGV[0])
end

========================= Error =========================
[root@localhost home]# ./permfix eclipse
./permfix:20:in `traverseDirectory': stack level too deep (SystemStackError)
         from ./permfix:19:in `each'
         from ./permfix:19:in `traverseDirectory'
         from ./permfix:21:in `traverseDirectory'
         from ./permfix:19:in `each'
         from ./permfix:19:in `traverseDirectory'
         from ./permfix:21:in `traverseDirectory'
         from ./permfix:19:in `each'
         from ./permfix:19:in `traverseDirectory'
          ... 3168 levels...
         from ./permfix:21:in `traverseDirectory'
         from ./permfix:19:in `each'
         from ./permfix:19:in `traverseDirectory'
         from ./permfix:45
[root@localhost home]#

-- 
Tobias DiPasquale
Solaris System Administrator
Electrical and Computer Engineering Dept.
Villanova University
mailto: anany@ece.vill.edu
tel: 610-519-5109