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Weird permission issue




I have a PHP app and it runs from /var/www/html/foo. It writes to a
log file in there log.txt. To do some testing I created a dir
/var/www/html/foo.new and installed the code there. To switch back and
forth I do this:

mv  /var/www/html/foo  /var/www/html/foo.old
mv /var/www/html/foo.new /var/www/html/foo

When I do that I get an error writing to the log file:

Error #2: fopen(/var/www/html/foo/log.txt): failed to open stream:
Permission denied

But if I switch back:

mv  /var/www/html/foo  /var/www/html/foo.new
mv /var/www/html/foo.old /var/www/html/foo

I do not get the error. The code is identical in foo and foo.new and
the perms and owner on log.txt is identical in too and foo.new. I have
tried restating apache and rebooting the machine, but no joy.

What could be causing the permission error?