#!/bin/bash
# back up an IMAP mail tree
# $Id$

OIFS="$IFS"
IFS=" 	
"

if test -f "$HOME/bin/functions"
then
    . "$HOME/bin/functions"
else
    echo "Cannot open functions library $HOME/bin/functions" 1>&2
    exit 1
fi

abort()
{
	notice "Aborted"
}

cleanup()
{
    info "Cleaning up"

    if test -f "$dfout"
    then
        run rm -rf -- "$dfout"
    fi

    if test -d "$snapshot"
    then
        run rm -rf -- "$snapshot"
    fi
}

#
# default configuration
#
debug=
quiet=true
simulate=
src=/home/michael/mail
#dst=voot:/home/kadmos/mail
dst=dreamhost:/home/mikelward/mail
logfile=/home/michael/log/mailbackup.log
dateformat='%-e %B %Y'
timeformat='%H:%M:%S'

#
# start
#
trap 'cleanup' EXIT
trap 'abort' INT TERM

info "Starting backup of $src on "$(date +"$dateformat")" at "$(date +"$timeformat")


#
# ensure required programs are available
#
if ! silent type rsync
then
    error "Cannot find rsync in PATH"
    exit 1
fi

#
# check disk space requirements
#
size=$(get_size_of_file_or_directory "$src")
if test $? -ne 0
then
    error "Cannot determine disk usage of $src"
    exit 1
fi

tmpdir=$(get_temporary_directory)
if test $? -ne 0
then
    error "Cannot determine temporary directory"
    exit 1
fi

available=$(get_free_space_on_filesystem "$tmpdir")
if test $? -ne 0
then
    error "Cannot determine free space on $tmpdir"
    exit 1
fi

if test $available -lt $size
then
    error "Need at least $size kilobytes free on $tmpdir"
    exit 1
fi

#
# take a snapshot of the repository
#
src=${src%/}
dirname=$(get_filename_part "$src")
if test -z "$dirname"
then
    dirname="root"
fi
snapshot="$tmpdir"/"$dirname".$$
if test -d "$snapshot"
then
    error "Snapshot directory $snapshot already exists"
    exit 1
fi

info "Creating a hot copy of $src"
run cp -a "$src" "$snapshot"
if test $? -ne 0
then
    error "Cannot create hot copy of $src"
    exit 1
fi

#
# copy the hot copy to the backup directory
#
if is_remote "$dst"
then
    debug "Remote destination"

    #dsthost=$(get_hostname_part "$dst")
    #dstdir=$(get_location_part "$dst")

    #notice "Removing $dstdir on $dsthost"
    #ssh "$dsthost" "test -d \"$dstdir\" && rm -rf -- \"$dstdir\""

    #info "Copying $snapshot to $dst"
    info "Synchronizing $snapshot to $dst"
    flags=
    if test "$debug"
    then
        flags="$flags -v"
    fi
    if test "$quiet"
    then
        flags="$flags -q"
    fi
    #scp -C -r $flags "$snapshot" "$dst"
    # ensure source has a trailing slash so we only copy the directory contents
    # (local:~/svn.12345/ -> remote:~/svn rather than
    #  local:~/svn.12345/ -> remote:~/svn/svn.12345)
    snapshot=${snapshot%/}/
    run rsync -a --delete $flags "$snapshot" "$dst"
else
    debug "Local destination, using cp"
    error "Local files are currently unsupported"
    exit 1
fi

info "Finished backup of $src on "$(date +"$dateformat")" at "$(date +"$timeformat")