Personal Computer World 2007 September/PCWSEP07.iso/Software/Linux/Linux Mint 3.0 Light/LinuxMint-3.0-Light.iso/casper/filesystem.squashfs/var/lib/dpkg/info/volumeid.postinst

Text File | 2007-04-10 | 4.3 KB | 204 lines

#!/bin/sh -e
# This script can be called in the following ways:
#
# After the package was installed:
#    <postinst> configure <old-version>
#
#
# If prerm fails during upgrade or fails on failed upgrade:
#    <old-postinst> abort-upgrade <new-version>
#
# If prerm fails during deconfiguration of a package:
#    <postinst> abort-deconfigure in-favour <new-package> <version>
#               removing <old-package> <version>
#
# If prerm fails during replacement due to conflict:
#    <postinst> abort-remove in-favour <new-package> <version>


# Rewrite /etc/fstab so that filesystems are mounted by UUID
mount_by_uuid_conversion()
{
    if [ -e /etc/fstab.pre-uuid ]; then
    return
    fi

    cp -a /etc/fstab /etc/fstab.pre-uuid
    exec 9<&0 8>&1 </etc/fstab >/etc/fstab.new
    trap "rm -f /etc/fstab.new" 0

    uuids=""

    old_IFS="$IFS"
    IFS="
"
    while read LINE
    do
    IFS="$old_IFS"
    set -- $LINE
    IFS="
"
    DEV=$1 MTPT=$2 FSTYPE=$3 OPTS=$4

    # Check the device is sane for conversion
    case "$DEV" in
        ""|\#*)        # Preserve blank lines and user comments
        echo "$LINE"
        continue
        ;;
        LABEL=*|UUID=*)    # Already mounting by LABEL or UUID
            echo "$LINE"
        continue
        ;;
        /dev/disk/*)    # Already mounting by particulars
            echo "$LINE"
        continue
        ;;
        /dev/fd[0-9]*)    # Floppy devices, not mounted by filesystem
            echo "$LINE"
        continue
        ;;
        /dev/mapper/*)    # devmapper devices, already by "label"
            echo "$LINE"
        continue
        ;;
        /dev/evms/*)    # evms devices, already by "label"
            echo "$LINE"
        continue
        ;;
        /dev/md[0-9]*)    # RAID devices, broken
            echo "$LINE"
        continue
        ;;
        /dev/*)        # Ordinary devices -- we want to convert
        if [ -L "$DEV" ] && readlink "$DEV" | grep -q "^/dev/mapper/"; then
            echo "$LINE"
            continue
        elif [ ! -b "$DEV" ]; then
            echo "$LINE"
            continue
        fi
            ;;
        *)            # Anything else gets left alone
            echo "$LINE"
        continue
    esac

    # Don't convert filesystem types that don't make sense
    case "$FSTYPE" in
        auto)        # Auto detection -- implies non-fixed fs
        echo "$LINE"
        continue
        ;;
    esac

    # Check filesystem options also
    case "$OPTS" in
        noauto|*,noauto|noauto,*|*,noauto,*)    # Implies non-fixed
            echo "$LINE"
        continue
        ;;
    esac


    # If we reach this point, we think we want to move the fstab
    # entry over to mount-by-UUID.  The first check is that the
    # filesystem on the device *has* a uuid
    UUID=$(/sbin/vol_id -u "$DEV" || true)
    if [ -z "$UUID" ]; then
        # Can we generate one?
        if [ "$FSTYPE" = "swap" ]; then
        REAL_FSTYPE=$(/sbin/vol_id -t "$DEV" || true)
        case "$REAL_FSTYPE" in
            swap)    # is a swap device, add a UUID to it
            UUID=$(uuidgen)
            echo -n "$UUID" |
              perl -ne 's/-//g;chomp;print pack "H*",$_' |
              dd conv=notrunc "of=$DEV" obs=1 seek=1036 2>/dev/null
            ;;
            swsusp)    # contains a suspended image, mkswap it!
            if ! mkswap "$DEV" >/dev/null; then
                echo "Warning: unable to make swap $DEV" 1>&2
                echo "$LINE"
                continue
            fi

            UUID=$(/sbin/vol_id -u "$DEV" || true)
            if [ -z "$UUID" ]; then
                echo "Warning: unable to generate uuid for $DEV" 1>&2
                echo "$LINE"
                continue
            fi
            ;;
            *)
            echo "Warning: $DEV is not a swap partition" 1>&2
            echo "$LINE"
            continue
            ;;
        esac
        else
        echo "Warning: unable to find a UUID for $DEV" 1>&2
        echo "$LINE"
        continue
        fi
    fi

    # Check for duplicates
    case "$uuids" in
    "$UUID" | "$UUID "* | *" $UUID" | *" $UUID "*)
        echo "Error: duplicate UUID $UUID detected" 1>&2
        echo "Unable to migrate /etc/fstab to UUID-based mounting" 1>&2

        exec 0<&9 9<&- 1>&8 8>&-
        trap 0

        rm -f /etc/fstab.new
        return
        ;;
    *)
        uuids="${uuids:+$uuids }$UUID"
        ;;
    esac

    # Now write the new line out
    shift
    echo "# $DEV -- converted during upgrade to edgy"
    echo "UUID=$UUID $@"
    done
    IFS="$old_IFS"

    exec 0<&9 9<&- 1>&8 8>&-
    trap 0

    mv -f /etc/fstab.new /etc/fstab
}

# Update the initramfs
update_initramfs()
{
    update-initramfs -u
}


case "$1" in
    configure)
    # Upgrade from dapper
    if dpkg --compare-versions "$2" lt "093-0ubuntu5"; then
        mount_by_uuid_conversion
    fi

    update_initramfs
    ;;

    abort-upgrade|abort-deconfigure|abort-remove)
    ;;

    *)
    echo "$0 called with unknown argument \`$1'" 1>&2
    exit 1
    ;;
esac


exit 0