#!/bin/bash

#Preupgrade assistant performs system upgradability assessment
#and gathers information required for successful operating system upgrade.
#Copyright (C) 2013 Red Hat Inc.
#Ondrej Vasik <ovasik@redhat.com>
#
#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.
#
#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with this program.  If not, see <http://www.gnu.org/licenses/>.
. /usr/share/preupgrade/common.sh
check_rpm_to "" ""
COMPONENT="distribution"
#END GENERATED SECTION

write_file()
{
log_warning "setup" "$1"
echo "$1" >>solution.txt
echo "$2" >>solution.txt
founderror=1
}


[ ! -r uidgid ] && log_error generic Part of the content is missing! && \
  exit $RESULT_ERROR

founderror=0
rm solution.txt
echo \
"Packages may create system accounts with static ids based on the reservation
in /usr/share/doc/setup-*/uidgid file. If you have some violations against the
uidgid file reservation, applications might not work properly or it may cause
some unexpected behaviour. As the reservations between releases of CentOS
might differ, please check carefully findings bellow.

Especially cases when id reserved by some application is used by different
account are really important. Using different account then reserved might
cause interoperability issues.

" > solution.txt

#check the reserved ids
for line in `cat uidgid`
do
myname=`echo "$line" | cut -d'|' -f1`
myuid=`echo "$line" | cut -d'|' -f2`
mygid=`echo "$line" | cut -d'|' -f3`
myhome=`echo "$line" | cut -d'|' -f4`
myshell=`echo "$line" | cut -d'|' -f5`
mypackages=`echo "$line" | cut -d'|' -f6`
#every entry should be just once - but to be on safe side, using m1
reserveduid=`cat "$VALUE_PASSWD" | grep -m1 ":x:$myuid:"`
reservedgid=`cat "$VALUE_GROUP" | grep -m1 ":x:$mygid:"`
nameline=`grep "^$myname:" "$VALUE_PASSWD"`


#reserved uid and gid not detected, no issue with this reservation
[ -z "$reserveduid" ] && [ -z "$reservedgid" ] && [ -z "$nameline" ] && continue

if [ -n "$nameline" ];
then
#check uid
[ -n "$myuid" ] && ([ x`echo $nameline | cut -d':' -f3` == x"$myuid" ] || \
 write_file "Invalid uid used for $myname account - now `echo $nameline | cut -d':' -f3`, should be $myuid". "This may cause troubles when exact static user id is expected by some application.")
#check gid
[ -n "$mygid" ] && ([ x`echo $nameline | cut -d':' -f4` == x"$mygid" ] || \
 write_file "Invalid gid used for $myname account - now `echo $nameline | cut -d':' -f4`, should be $mygid". "This may cause troubles when exact static user id is expected by some application.")
#check homedir (FIXME: Should we warn about this in preupgrade?)
[ -n "$myhome" ] && ([ x`echo $nameline | cut -d':' -f6` == x"$myhome" ] || \
 log_info setup "Incorrect homedir used for $myname account - now `echo $nameline | cut -d':' -f6`, should be $myhome based on reservation data")
#check loginshell (FIXME: Should we warn about this in preupgrade?)
[ -n "$myshell" ] && ([ x`echo $nameline | cut -d':' -f7` == x"$myshell" ] || \
 log_info setup "Incorrect shell used for $myname account - now `echo $nameline | cut -d':' -f7`, should be $myshell based on reservation data")
fi

#check for invalid reserveduid usage
if [ -n "$reserveduid" ];
then
  [ x`echo $reserveduid | cut -d':' -f1` == x"$myname" ] || write_file "Id `echo $reserveduid | cut -d':' -f3` reserved for $myname is used by `echo $reserveduid | cut -d':' -f1`" "Account $myname should be created by the package(s) $mypackages. If you plan to use them on system, it may cause troubles as the account $myname might not be created properly."
fi

#check for invalid reservedgid usage
if [ -n "$reservedgid" ];
then
  [ x`echo $reservedgid | cut -d':' -f1` == x"$myname" ] || write_file "Id `echo $reservedgid | cut -d':' -f3` reserved for $myname is used by `echo $reservedgid | cut -d':' -f1`" "Account $myname should be created by the package(s) $mypackages. If you plan to use them on system, it may cause troubles as the account $myname might not be created properly."
fi
done
echo \
"
These issues usually don't cause critical failures, but in rare cases can
contribute to some hard to analyze failures in the case that the system id
values are hard-coded in the application.
" >> solution.txt

[ $founderror -eq 1 ] && exit $RESULT_FAIL

#no issues found, so remake solution text
rm solution.txt
echo \
"Packages may create system accounts with static ids based on the reservation
in /usr/share/doc/setup-*/uidgid file. If you have some violations against the
uidgid file reservation, applications might not work properly or it may cause
some unexpected behavior. In your case, no important divergence from the
reservations was found. Even the smaller findings - like different login
shells and application home directories - may be worth to check - you can
find these in warnings.
Flaws in reserved ids were not found on your system, so this check passed
even the warnings may exist.
" >solution.txt
exit $RESULT_PASS
