How can I report on all home directory use?

If you are a system administrator, you can get a CSV listing of all home directory use, including status of the owners of home directories with the following script:

#!/bin/bash

# Read a list of usernames (or directory names)
# and run quota on them.
#
# Falls back to (slow) 'du' if a quota is not set on the user
# or the user id is non-existent.
#
# This is used to get the size of home directories
# of current users, as well as those users who are no longer present.

SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )

USERNAMES=$SCRIPT_DIR/usernames.txt
QUOTA_CMD="quota"
TARGET_DIR="/mnt/nfs/home"
TARGET_MNT="nfs01-ib:/home"

echo "Username,User_Active,Directory_Present,Directory_Owner,Directory_Group,Space_Calculation_Type,Space_Used,Directory,Dir_Perms"
cat $USERNAMES | while read U
do
        # Is this an active username
        uid=`id -u $U 2>/dev/null`
        if [ "$?" == "0" ]
        then
                user_status="Yes"
        else
                user_status="No"
        fi
        
        # Look up home directory space utilisation
        if [ -d "$TARGET_DIR/$U" ]
        then
                # Get owner and group of home directory
                L=`ls -ld $TARGET_DIR/$U`
                user_owner=`echo $L | awk '{print $3}'`
                user_group=`echo $L | awk '{print $4}'`
                dir_perms=`echo $L | awk '{print $1}'`

                quota_size=`$QUOTA_CMD -u $U 2>/dev/null | grep $TARGET_MNT | awk '{print $2}'`
                if [ "$quota_size" == "" ]
                then
                        # No quota set ... try again with the UID
                        quota_size=`$QUOTA_CMD -u $user_owner 2>/dev/null | grep $TARGET_MNT | awk '{print $2}'`
                        if [ "$quota_size" == "" ]
                        then
                                # no quota set ... should we fall back to 'du' ???
                                quota_size=`du -s "$TARGET_DIR/$U" | awk '{print $1}'`
                                echo "$U,$user_status,Found,$user_owner,$user_group,du,$quota_size,$TARGET_DIR/$U,$dir_perms"
                        else
                                # Found quota by UID
                                quota_size=`echo $quota_size | sed 's/\*//g'`
                                echo "$U,$user_status,Found,$user_owner,$user_group,quota_uid,$quota_size,$TARGET_DIR/$U,$dir_perms"
                        fi
                else
                        # Found quota by username
                        quota_size=`echo $quota_size | sed 's/\*//g'`
                        echo "$U,$user_status,Found,$user_owner,$user_group,quota_username,$quota_size,$TARGET_DIR/$U,$dir_perms"
                fi
        else
                # Unable to find user home directory
                echo "$U,$user_status,Missing,NA,NA,NA,0,$TARGET_DIR/$U,NA"
        fi
done

You will need to set the following variables:

• QUOTA_CMD - The command to run to get a disk quota report. This may need to be quota for normal Linux filesystems/mounts, and lfs quota for Lustre filesystem mounts.
• TARGET_DIR - Where your home directories are located in your filesystem; e.g. /mnt/home, /home or similar.
• TARGET_MNT - The hostname and export on which your home directory filesystem is mounted and on which quotas are enabled; e.g. server:/home

You will need to supply a file usernames.txt which has a list of usernames/home directory names, one per line, e.g.

bob
john
emma
testuser

These will be assumed to be the directories under TARGET_DIR which are then checked, i.e. $TARGET_DIR/bob, $TARGET_DIR/testuser, etc.

• To determine if a user is active, we try to use id to return their UID. If it is found, then we assume the account is valid.
• If we have an active username then we pass that username to $QUOTA_CMD -u.
• If a username is not active, then we try to call $QUOTA_CMD -u using the leftover UID which the directory belongs to.
• If that still fails, then we finally resort to calculating directory size using du. This is the slowest method and we only use it in the last case.

This script will not run as a normal user - the calls to quota, lfs quota and du will fail.

The output from the script will be a single line per username/home directory named in usernames.txt, with the following fields:

• Username
• Is user active? - If not, then it shows the user account has expired
• Is home directory present?
• Username or UID of the home directory owner - If this doesn't match username, then we have a mismatch in home directory name and assigned owner
• Group name or GID of the home directory group
• Method used to calculate space (quota, quota using UID only, or du)
• Space used, in Kilobytes
• Directory path
• Directory permissions

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