Synnefo » snf-image

# Copyright 2011 GRNET S.A. All rights reserved.

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RESULT=/dev/ttyS1

FLOPPY_DEV=/dev/fd0

PROGNAME=$(basename $0)

PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin

# Programs

XMLSTARLET=xmlstarlet

RESIZE2FS=resize2fs

PARTED=parted

CLEANUP=( )

add_cleanup() {

    local cmd=""

    for arg; do cmd+=$(printf "%q " "$arg"); done

    CLEANUP+=("$cmd")

}

log_error() {

    echo "ERROR: $@" | tee $RESULT >&2

    exit 1

}

warn() {

    echo "Warning: $@" >&2

}

get_base_distro() {

    local root_dir=$1

    if [ -e "$root_dir/etc/debian_version" ]; then

        echo "debian"

    elif [ -e "$root_dir/etc/redhat-release" ]; then

        echo "redhat"

    elif [ -e "$root_dir/etc/slackware-version" ]; then

        echo "slackware"

    elif [ -e "$root_dir/SuSE-release" ]; then

        echo "suse"

    elif [ -e "$root_dir/gentoo-release" ]; then

        echo "gentoo"

    fi

}

get_distro() {

    local root_dir=$1

    if [ -e "$root_dir/etc/debian_version" ]; then

        distro="debian"

        if [ -e ${root_dir}/etc/lsb-release ]; then

            ID=$(grep ^DISTRIB_ID= ${root_dir}/etc/lsb-release | cut -d= -f2)

            if [ "x$ID" = "xUbuntu" ]; then

                distro="ubuntu"

            fi

        fi

        echo "$distro"

    elif [ -e "$root_dir/etc/fedora-release" ]; then

        echo "fedora"

    elif [ -e "$root_dir/etc/centos-release" ]; then

        echo "centos"

    elif [ -e "$root_dir/etc/redhat-release" ]; then

        echo "redhat"

    elif [ -e "$root_dir/etc/slackware-version" ]; then

        echo "slackware"

    elif [ -e "$root_dir/SuSE-release" ]; then

        echo "suse"

    elif [ -e "$root_dir/gentoo-release" ]; then

        echo "gentoo"

    fi

}

get_last_partition() {

    local dev="$1"

    "$PARTED" -s -m "$dev" unit s print | tail -1

}

get_partition() {

    local dev="$1"

    local id="$2"

    "$PARTED" -s -m "$dev" unit s print | grep "^$id" 

}

get_partition_count() {

    local dev="$1"

     expr $("$PARTED" -s -m "$dev" unit s print | wc -l) - 2

}

get_last_free_sector() {

    local dev="$1"

    local last_line=$("$PARTED" -s -m "$dev" unit s print free | tail -1)

    local type=$(echo "$last_line" | cut -d: -f 5)

    if [ "$type" = "free;" ]; then

        echo "$last_line" | cut -d: -f 3

    fi

}

cleanup() {

    # if something fails here, it shouldn't call cleanup again...

    trap - EXIT

    if [ ${#CLEANUP[*]} -gt 0 ]; then

        LAST_ELEMENT=$((${#CLEANUP[*]}-1))

        REVERSE_INDEXES=$(seq ${LAST_ELEMENT} -1 0)

        for i in $REVERSE_INDEXES; do

            # If something fails here, it's better to retry it for a few times

            # before we give up with an error. This is needed for kpartx when

            # dealing with ntfs partitions mounted through fuse. umount is not

            # synchronous and may return while the partition is still busy. A

            # premature attempt to delete partition mappings through kpartx on a

            # device that hosts previously mounted ntfs partition may fail with

            # a `device-mapper: remove ioctl failed: Device or resource busy'

            # error. A sensible workaround for this is to wait for a while and

            # then try again.

            local cmd=${CLEANUP[$i]}

            $cmd || for interval in 0.25 0.5 1 2 4; do

            echo "Command $cmd failed!"

            echo "I'll wait for $interval secs and will retry..."

            sleep $interval

            $cmd && break

        done

	if [ "$?" != "0" ]; then

            echo "Giving Up..."

            exit 1;

        fi

    done

  fi

}

check_if_excluded() {

    test "$PROGNAME" = "snf-image-helper" && return 0

    eval local do_exclude=\$SNF_IMAGE_PROPERTY_EXCLUDE_${PROGNAME:2}_TASK

    if [ -n "$do_exclude" ]; then

        warn "Task $PROGNAME was excluded and will not run."

        exit 0

    fi

    return 0

}

trap cleanup EXIT

# Check if the execution of a task should be ommited

check_if_excluded

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