Set correct permissions on html/cache, without needing umask [patch]

[Nicolas]

When trying to run the upgrade script on my recently-installed project, or manually delete the html/cache directory, it errors with Permission denied. The cache directory is owned by user www-data, group www-data, permissions 0740 (drwxr-x---, note no group write). Both 'www-data' and 'boincadm' belong to group 'boinc'. Looking at cache.inc, it seems it's creating the directories with permissions 0770 (with group write), but with the umask at its default 0022, it ends up being 0740.

ServerIntro#permissions mentions setting umasks on both boincadm and apache users to allow group write (but there is no further instructions on how to do that). The old GroupPermissions page mentions umasks as part of an alternative and non-recommended permission configuration. Additionally, the server admin said:

I've been reading a few bits about setting umask for apache and it's not at all straight-forward - really not recommended

I attach a patch for cache.inc that chmods the directory after creation, forcing it to have the correct permissions. That makes it work without the need for umask. I will have a look later for other PHP-created files or directories that may need similar handling.

[Nicolas]

Patch to cache.inc to make it set correct permissions

[Nicolas]

Add patch availability to ticket title.

[davea]

(In [14435]) - user web: when creating cache dir, chmod() so that

protections are right regardless of umask. From Nicolas Alvarez; fixes #344