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Personal Computer World 2009 February
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sudo.postinst
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2008-09-01
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#!/usr/bin/perl
# remove old link
unlink ("/etc/alternatives/sudo") if ( -l "/etc/alternatives/sudo");
# make sure we have a sudoers file
if ( ! -f "/etc/sudoers") {
print "No /etc/sudoers found... creating one for you.\n";
open (SUDOERS, "> /etc/sudoers");
print SUDOERS "# /etc/sudoers\n",
"#\n",
"# This file MUST be edited with the 'visudo' command as root.\n",
"#\n",
"# See the man page for details on how to write a sudoers file.\n",
"#\n\nDefaults\tenv_reset\n\n",
"# Host alias specification\n\n",
"# User alias specification\n\n",
"# Cmnd alias specification\n\n",
"# User privilege specification\nroot\tALL=(ALL) ALL\n\n",
"# Uncomment to allow members of group sudo to not need a password\n",
"# (Note that later entries override this, so you might need to move\n",
"# it further down)\n",
"# %sudo ALL=NOPASSWD: ALL\n";
close SUDOERS;
}
# make sure sudoers has the correct permissions and owner/group
system ('chown root:root /etc/sudoers');
system ('chmod 440 /etc/sudoers');
# must do a remove first to un-do the "bad" links created by previous version
system ('update-rc.d -f sudo remove >/dev/null 2>&1');
#system ('update-rc.d sudo start 75 S . >/dev/null');
# make sure we have a sudo group
exit 0 if getgrnam("sudo"); # we're finished if there is a group sudo
$gid = 27; # start searcg with gid 27
setgrent;
while (getgrgid($gid)) {
++$gid;
}
endgrent;
if ($gid != 27) {
print "On Debian we normally use gid 27 for 'sudo'.\n";
$gname = getgrgid(27);
print "However, on your system gid 27 is group '$gname'.\n\n";
print "Would you like me to stop configuring sudo so that you can change this? [n] ";
$ans = <STDIN>;
if ($ans =~ m/^[yY].*/) {
print "'dpkg --pending --configure' will restart the configuration.\n\n\n";
exit 1;
}
}
print "Creating group 'sudo' with gid = $gid\n";
system("groupadd -g $gid sudo");
print "";