%pre --erroronfail

# Get the FD used by subshells to log output
exec {stdout}>&1

# Source common functions
. /tmp/ks-functions.sh

wlog "pre prestaging install check"

# First, parse /proc/cmdline to find the boot args
set -- `cat /proc/cmdline`
for I in $*; do case "$I" in *=*) eval $I 2>/dev/null;; esac; done
for J in $*; do case "$J" in force_install) force_install=${J};; esac; done

if [ -e /run/install/repo/ks-setup.cfg ]; then
    source /run/install/repo/ks-setup.cfg
fi

# if force_install is set, install anyway. Ignore the remainder of this section.
if [ -z ${force_install} ]; then
    if [ -z "$rootfs_device" ]; then
        rootfs_device=$(get_disk_dev)
    fi
    
    orig_rootfs_device=$rootfs_device
    by_path_rootfs_device=$(get_by_path $rootfs_device)
    rootfs_device=$(get_disk $by_path_rootfs_device)
    wlog "Found rootfs $orig_rootfs_device on: $by_path_rootfs_device->$rootfs_device."
    
    part_numbers=( $(parted -s ${rootfs_device} print | awk '$1 == "Number" {i=1; next}; i {print $1}') )
    # print the partnumber info for informational purposes
    for i in ${part_numbers[@]}; do
        wlog "partnumber: ${i}"
    done
    
    # Get the correct rootfs prefix
    ROOTFS_PART_PREFIX=${rootfs_device}
    # check if rootfs part is nvme (eg. /dev/nvme0n1). The partitions have a "p" in the part prefix.
    # for example, /dev/nvme0n1p1
    # so we need to add the letter "p" to get the prefix.
    # The part numbers will be used later in the code.
    case $rootfs_device in
        *"nvme"*)
            ROOTFS_PART_PREFIX=${ROOTFS_PART_PREFIX}p
        ;;
    esac
    
    # temporary mount directory
    temp_mount=/mnt
    
    wlog "Searching for existing installation..."
    for part in "${part_numbers[@]}"; do
        device=${ROOTFS_PART_PREFIX}${part}
        wlog "Searching on ${device}"
        # mount this part at a temporary mount point
        mount ${device} ${temp_mount}
        if [ $? -ne 0 ]; then
            wlog "unable to mount ${device}"
            continue
        fi
        # Check for the presence of install_uuid in one of the partitions on
        # the root device
        if [ -e ${temp_mount}/var/www/pages/feed/rel-xxxPLATFORM_RELEASExxx/install_uuid ]; then
            wlog "Found valid installation on ${device}"
            umount ${temp_mount}
            # do not modify the system in any way
            report_pre_failure_with_msg "Prestage rejected. Existing installation detected. Please eject the media before rebooting."
        fi
        umount ${temp_mount}
    done
    wlog "Installing Prestaged content. No existing installation found."
else
    # force install inspite of existing installation
    wlog "Force install the prestage content"
    wlog "Installing Prestaged content. All existing installations will be lost."
fi
%end