Date: Thu, 12 May 2005 16:05:05 +0200 (CEST) From: Svein Halvor Halvorsen <svein-freebsd-questions@theloosingend.net> To: Chuck Swiger <cswiger@mac.com> Cc: questions@freebsd.org Subject: Re: user owned groups Message-ID: <20050512155122.U82794@maren.thelosingend.net> In-Reply-To: <42824FFA.4080603@mac.com> References: <20050511165506.GC10213@asu.edu> <428242D7.6040103@mac.com> <20050511174702.GA23222@noisy.compsoc.man.ac.uk> <42824FFA.4080603@mac.com>
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* Chuck Swiger [2005-05-11 14:33 -0400]
> Otherwise, you only have one default umask. I'm not sure there is a sane way
> of changing it depending on which directory you are currently in, but you
> might try setting up an alias ("cd77", "cd22"?) which combines setting the
> umask and cd'ing.
On my system, I keep .umask files lying around which has a umask number in
it. Then in the systemwide bashrc file, I have [1; see below]. I have a
/.umask file with a 0022 in it, and a 0077 in /home/.umask
The function below will traverse the directory tree and try to find a
.umask file in any directory in "this" or any higher level. Then it will
read the value from the file and apply it to the umask command. If the
umask is changing as a result of this, it will print a message stating the
current umask, as well as which file was used to decide the current umask.
If the umask is either group- or world-writable, a warning is issued.
For non-bash users, I have not made an equivalent, and the umask is just
set to 0077. I don't think I have any such users though (it's basically
just me and my closest family who has access to my server). I think this
will work in old style Bourne shells as well, though.
[1]
DEFUMASK=`umask`
cd(){
builtin cd "$@"
oldumask=$(printf "%04.0f" `umask`)
dir=$PWD
found=false
while [[ "$dir" != "/" ]] && [[ "$found" != "true" ]] ; do
if [ -f "$dir/.umask" ]; then
umask `cat $dir/.umask 2>/dev/null`
found=true
else
dir=`dirname "$dir"`
fi
done
[[ "$found" != "true" ]] && umask $DEFUMASK
newumask=$(printf "%04.0f" `umask`)
if [ "$PS1" != "" ]; then
if [[ "$oldumask" -ne "$newumask" ]]; then
[[ "$found" == "true" ]] && echo "Using .umask from $dir"
echo "umask is `umask` (`umask -S`)"
fi
[[ "`echo $newumask|cut -c3`" -lt "2" ]] && echo "WARNING: Insecure umask (group-writeable)"
[[ "`echo $newumask|cut -c4`" -lt "2" ]] && echo "WARNING: Insecure umask (world-writeable)"
fi
unset oldumask newumask dir found
}
pushd(){
builtin pushd "$@"
cd "$PWD"
}
popd(){
builtin popd "$@"
cd "$PWD"
}
cd "$PWD" >/dev/null 2>&1
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