#!/bin/bash

######################################################
#                                                    #
# vrun -- run a command on one or more virtual hosts #
#         as root (default) or the administrative    #
#         user for the host (--as-admin switch)      #
#                                                    #
# --verbose Shows a banner with the host, user, and  #
#           command for each host the specified      #
#           command is applied to.                   #
#                                                    #
# --as-admin run the command as the admin user of    #
#            of the specified site(s)                #
#                                                    #
# --on Specify which host(s) to run the command on;  #
#      defaults to ALL virtual hosts on the system.  #
#      Can use shell wildcards, e.g. "foo*" or a     #
#      space-separated list .e.g "foobar.net net.com #
#                                                    #
######################################################
#
#  Examples:
#
#  List long format all files under each virtual root
#  ------------------------
#  $ vrun --verbose ls -al /
#
#  Substitute foo with bar in every hosts file on every domain
#  ------------------------
#  $ vrun perl -p -i -e 's/foo/bar' /etc/hosts
#
#  Do a less on the error log for virtual host foobar.net
#  ------------------------
#  $ vrun less /var/log/httpd/error_log --on foobar.net
#
#  Same as above for several hosts
#
#  Do a less on the error log for virtual host foobar.net
#  ------------------------
#  $ vrun less /var/log/httpd/error_log --on "foobar.net barbar.com"
#
#  vi /home/userx/.forward as admin on hostn.org
#  ------------------------
#  $ vrun --as-admin --on hostn.org vi /home/userx/.forward
#

HOSTS="$(/usr/local/bin/sitelookup -a domain)"
CMD=
VERBOSE=0
ASADMIN=0

for arg
do

    if [ "$SKIP" = "1" ]
    then
        SKIP=0
        continue
    fi

    case $arg in
        --on)
            shift
            SKIP=1
            HOSTS=$1;;
        --verbose)
            VERBOSE=1;;
        --help)
            echo \
            "$0 [--verbose] [--help] [--as-admin] [--on hostpat] CMD ARG0..ARGN"
            echo "Example: $0 --as-admin --on foobar.net less /etc/passwd"
            exit 1;;
        --as-admin)
            ASADMIN=1;;
        *)  
            CMD="$CMD $1"
        ;;
    esac

    shift
        
done


CMD=$(echo $CMD | sed -e 's/^ //')

cd /home/virtual

for host in $(echo $HOSTS)
do

    runas="root"

    if [ $ASADMIN -eq 1 ]
    then
        user=$(/usr/local/bin/sitelookup -d $host site_admin)
        if [ -z $user ]
        then
            echo "Skipping $domain, no admin found (domain alias?)"
            continue
        else
            runas="$user"
            RUN="su - $user#$host -c"
        fi
    else
        RUN="/usr/sbin/chroot /home/virtual/$host/ bash -c"
    fi

    [ $VERBOSE -eq 1 ] && {
        echo "----> $host (user: $runas) $CMD "
    }

    $RUN "$CMD"

done