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#!/bin/sh
#
# $FreeBSD: releng/11.1/etc/autofs/special_media 318490 2017-05-18 20:37:47Z trasz $
#

# Print newline-separated list of devices available for mounting.
# If there is a filesystem label - use it, otherwise use device name.
print_available() {
        local _fstype _fstype_and_label _label _p

        for _p in ${providers}; do
                _fstype_and_label="$(fstyp -l "/dev/${_p}" 2> /dev/null)"
                if [ $? -ne 0 ]; then
                        # Ignore devices for which we were unable
                        # to determine filesystem type.
                        continue
                fi

                _fstype="${_fstype_and_label%% *}"
                if [ "${_fstype}" != "${_fstype_and_label}" ]; then
                        _label="${_fstype_and_label#* }"
                        # Replace plus signs and slashes with minuses;
                        # leading plus signs have special meaning in maps,
                        # and multi-component keys are just not supported.
                        _label="$(echo ${_label} | sed 's,[+/],-,g')"
                        echo "${_label}"
                        continue
                fi

                echo "${_p}"
        done
}

# Print a single map entry.
print_map_entry() {
        local _fstype _p

        _fstype="$1"
        _p="$2"

        case "${_fstype}" in
        "exfat")
                if [ -f "/usr/local/sbin/mount.exfat" ]; then
                        echo "-mountprog=/usr/local/sbin/mount.exfat,fstype=${_fstype},nosuid   :/dev/${_p}" 
                else
                        /usr/bin/logger -p info -t "special_media[$$]" \
                            "Cannot mount ${_fstype} formatted device /dev/${_p}: Install sysutils/fusefs-exfat first"
                        exit 1
                fi
                ;;
        "ntfs")
                if [ -f "/usr/local/bin/ntfs-3g" ]; then
                        echo "-mountprog=/usr/local/bin/ntfs-3g,fstype=${_fstype},nosuid        :/dev/${_p}" 
                else
                        /usr/bin/logger -p info -t "special_media[$$]" \
                            "Cannot mount ${_fstype} formatted device /dev/${_p}: Install sysutils/fusefs-ntfs first"
                        exit 1
                fi
                ;;
        "ext2fs" | "msdosfs")
                echo "-fstype=${_fstype},nosuid,async   :/dev/${_p}" 
                ;;
        *)
                echo "-fstype=${_fstype},nosuid :/dev/${_p}" 
                ;;
        esac
}

# Determine map entry contents for the given key and print out the entry.
print_one() {
        local _fstype _fstype_and_label _label _key _p

        _key="$1"

        _fstype="$(fstyp "/dev/${_key}" 2> /dev/null)"
        if [ $? -eq 0 ]; then
                print_map_entry "${_fstype}" "${_key}"
                return
        fi

        for _p in ${providers}; do
                _fstype_and_label="$(fstyp -l "/dev/${_p}" 2> /dev/null)"
                if [ $? -ne 0 ]; then
                        # Ignore devices for which we were unable
                        # to determine filesystem type.
                        continue
                fi

                _fstype="${_fstype_and_label%% *}"
                if [ "${_fstype}" = "${_fstype_and_label}" ]; then
                        # No label, try another device.
                        continue
                fi

                _label="${_fstype_and_label#* }"
                # Replace plus signs and slashes with minuses;
                # leading plus signs have special meaning in maps,
                # and multi-component keys are just not supported.
                _label="$(echo ${_label} | sed 's,[+/],-,g')"
                if [ "${_label}" != "${_key}" ]; then
                        # Labels don't match, try another device.
                        continue
                fi

                print_map_entry "${_fstype}" "${_p}"
        done

        # No matching device - don't print anything, autofs will handle it.
}

# Obtain a list of (geom-provider-name, access-count) pairs, turning this:
#
# z0xfffff80005085d00 [shape=hexagon,label="ada0\nr2w2e3\nerr#0\nsector=512\nstripe=0"];
#
# Into this:
#
# ada0 r2w2e3
#
# XXX: It would be easier to use kern.geom.conftxt instead, but it lacks
#      access counts.
pairs=$(sysctl kern.geom.confdot | sed -n 's/^.*hexagon,label="\([^\]*\)\\n\([^\]*\).*/\1 \2/p')

# Obtain a list of GEOM providers that are not already open - not mounted,
# and without other GEOM class, such as gpart, attached.  In other words,
# grep for "r0w0e0".  Skip providers with names containing slashes; we're
# not interested in geom_label(4) creations.
providers=$(echo "$pairs" | awk '$2 == "r0w0e0" && $1 !~ /\// { print $1 }' | grep -v 'ada[01].*')

if [ $# -eq 0 ]; then
        print_available
        exit 0
fi

print_one "$1"
exit 0