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Full Discussion: help on umask
Operating Systems Linux help on umask Post 302184247 by era on Friday 11th of April 2008 03:25:51 AM
Old 04-11-2008
If you were not allowed to change it under any circumstances, it ought to be impossible. But you can. However, you should be aware of the security implications. If you set it too loose, people will be creating private files in their home directories which are readable by anyone -- if that's acceptable then go ahead. (Setting it tighter than the default is usually not a problem.)

Sounds like you might be barking up the wrong tree, though. Could you describe what problem you are trying to solve? If you want files in a shared directory to be created with specific permissions, maybe your platform would offer a facility for this by other means (for example, by using the setgid bit on the directory, on some platforms).
 

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DH_FIXPERMS(1)							     Debhelper							    DH_FIXPERMS(1)

NAME
dh_fixperms - fix permissions of files in package build directories SYNOPSIS
dh_fixperms [debhelperoptions] [-Xitem] DESCRIPTION
dh_fixperms is a debhelper program that is responsible for setting the permissions of files and directories in package build directories to a sane state -- a state that complies with Debian policy. dh_fixperms makes all files in usr/share/doc in the package build directory (excluding files in the examples/ directory) be mode 644. It also changes the permissions of all man pages to mode 644. It makes all files be owned by root, and it removes group and other write permission from all files. It removes execute permissions from any libraries, headers, Perl modules, or desktop files that have it set. It makes all files in the standard bin and sbin directories, usr/games/ and etc/init.d executable (since v4). Finally, it removes the setuid and setgid bits from all files in the package. OPTIONS
-Xitem, --exclude item Exclude files that contain item anywhere in their filename from having their permissions changed. You may use this option multiple times to build up a list of things to exclude. SEE ALSO
debhelper(7) This program is a part of debhelper. AUTHOR
Joey Hess <joeyh@debian.org> 9.20120909 2012-05-19 DH_FIXPERMS(1)
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