#!/usr/bin/env perl

 

 

 #this is the root of the package users' homes

 $pkg_home_root =  "/pkg";

 

 

 if ($ARGV[0] eq "--help"){

   print <<"HERE";

 

 pkg -- create a package user.

 

 syntax:

   pkg package-name description

   pkg --help 

   

 Create a package user for the purpose of compiling

 a particular package.

 

 The user will be created with user and group both

 equal to the name you specify.

 

 You will then be put into the user's home

 directory where you may proceed with

 compiling/installing the package.

 

 If the user already exists, this is equivalent to 

   su --login package-name

 

 Written by Robert McIntyre. This software is free

 software and is released to the public domain.

   

 HERE

 exit 0;

 }

 $" = " ";

 

 $pkg_name = $ARGV[0];

 

 $pkg_desc = $ARGV[1];

 

 # Validate pkg_user as a user name.

 if (!($pkg_name =~ m/^[a-z_][a-z0-9_-]*\$?$/)){

   print "$pkg_name is not a valid user name!\n";

   exit 1;

 }

 

 # Validate description.

 if ($pkg_desc =~ m/:/){

   print "Package Description cannot contain \":\"\n";

   exit 1;

 }

 

 

 $pkg_home = "$pkg_home_root/$pkg_name";

 

 #set default for $pkg_desc.

 if (!($pkg_desc)){$pkg_desc = $pkg_name;}

 

 @pkg_switch_cmd =  ("su", "--login", $pkg_name);

 

 @pkg_create_cmd =

   ("useradd", "-c", $pkg_desc, "-d", $pkg_home, 

    "-g", $pkg_name, "-s", "/bin/bash",

    $pkg_name);

 

 @pkg_create_group_cmd =

   ("groupadd", "--force", $pkg_name);

 

 @pkg_create_home_cmd = 

   ("install", "-d", "-g", $pkg_name, "-o", $pkg_name, "-m", "700", $pkg_home);

 

 sub execute{print "\t@_\n"; system(@_) and die $!;}

 

 #determine if the user already exists:

 `id $pkg_name 2>/dev/null`;

 if (!$?){

   print "Change user.\n";

   execute(@pkg_switch_cmd); exit 0;}

 

 print "Creating package group.\n";

 execute(@pkg_create_group_cmd);

 

 print "Creating package user.\n";

 execute(@pkg_create_cmd);

 

 print "Create home directory for $pkg_name.\n";

 execute(@pkg_create_home_cmd);

 

 print "Change user.\n";

 execute(@pkg_switch_cmd);