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#!/usr/bin/tclsh
# Copyright (c) 1996 Wolfram Schneider <wosch@FreeBSD.org>. Berlin.
# All rights reserved.
#
# addgroup - add a group or add users to a group
#
# addgroup [-g gid] group [user[,user,...]]
#
#
# addgroup -g 2000 foobar
#
# Add group `foobar' to group database. Group id is 2000 if
# possible or higher. Don't add group `foobar' if `foobar' is
# already in group database.
#
#
# addgroup foo blech,bar
#
# Add user `blech' and user `bar' to group `foo'. Create group
# `foo' with default gid if not exists.
#
#
# The option [-g gid] is only for new groups.
#
# see group(5)
#
# TODO:
# file locking
# signal handling
# add only users who exist
#
# $FreeBSD$
# set global variables
set etc_group "/etc/group"; #set etc_group "/usr/tmp/group"
set gid_start 1000
set gid_max 65500
proc putsErr {string} {
if {[catch {open "/dev/stderr" w} stderr]} {
puts $stderr
} else {
puts $stderr $string
close $stderr
}
}
proc usage {} {
putsErr {usage: addgroup group [user]}
putsErr { addgroup [-g gid] group [user[,user,...]]}
exit 1
}
# check double user names: foo,bla,foo
proc double_name {groupmembers} {
set l [split $groupmembers ","]
if {[llength $l] > 1} {
for {set i 0} {$i < [llength $l]} {incr i} {
if {[lsearch [lrange $l [expr $i + 1] end] \
[lindex $l $i]] != -1} {
putsErr "Double user name: [lindex $l $i]"
return 1
}
}
}
return 0
}
# cleanup and die
proc Err {string} {
upvar etc_group_new new
putsErr "$string"
exec rm -f $new
exit 1
}
if {$argc < 1} { usage }
# check options
switch -glob -- [lindex $argv 0] {
-g* {
if {$argc < 2} {
putsErr "Missing group id"
usage
}
set g [lindex $argv 1]
if {$g < 100 || $g >= $gid_max} {
putsErr "Group id out of range 100 < $g < $gid_max"
usage
}
set gid_start $g
incr argc -2
set argv [lrange $argv 2 end]
}
-* { usage }
}
if {$argc < 1} { usage }
# read group name
set groupname [lindex $argv 0]
if {[string match "*:*" $groupname] != 0} {
putsErr "Colon are not allowed in group name: ``$groupname''"
usage
}
# read optional group members
if {$argc == 2} {
set groupmembers [lindex $argv 1]
if {[string match "*:*" $groupmembers] != 0} {
putsErr "Colon are not allowed in user names: ``$groupmembers''"
usage
}
if {[double_name $groupmembers] != 0} {
usage
}
} else {
set groupmembers ""
}
# open /etc/group database
if {[catch {open $etc_group r} db]} {
Err $db
}
# open temporary database
set etc_group_new "$etc_group.new";
if {[catch {open $etc_group_new w} db_new]} {
Err $db_new
}
set done 0
while {[gets $db line] >= 0 } {
if {$done > 0} {
puts $db_new $line
continue
}
# ``group:passwd:gid:member''
# 0 1 2 3
set l [split $line ":"]
set group([lindex $l 0]) [lindex $l 2]
set gid([lindex $l 2]) [lindex $l 0]
set member([lindex $l 0]) [lindex $l 3]
# found existing group
if {[string compare [lindex $l 0] $groupname] == 0} {
if {[string compare $groupmembers ""] == 0} {
Err "Group exists: ``$groupname''"
}
# add new group members
set y [lindex $l 3]
# group with no group members?
if {[string compare $y ""] == 0} {
puts $db_new "$line$groupmembers"
} else {
if {[double_name "$y,$groupmembers"] != 0} {
Err "\t$line,$groupmembers"
} else {
puts $db_new "$line,$groupmembers"
}
}
set done 1
} else {
puts $db_new $line
}
}
# add a new group
if {$done == 0} {
for {set i $gid_start} {$i < $gid_max} {incr i} {
if {[info exists gid($i)] == 0} {
puts $db_new "$groupname:*:$i:$groupmembers"
set done 1
break
}
}
# no free group id
if {$done == 0} {
Err "Cannot find free group id: ``$groupname''"
}
}
close $db_new
close $db
exec cp -pf $etc_group "$etc_group.bak"
exec mv -f $etc_group_new $etc_group
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