source: client/shared/lib/os-probes/50mounted-tests @ 1d1e06d

#!/bin/sh
# Sub-tests that require a mounted partition.
set -e
partition="$1"

. /usr/share/os-prober/common.sh

types="$(fs_type "$partition")" || types=NOT-DETECTED
if [ "$types" = NOT-DETECTED ] || [ -z "$types" ]; then
        debug "$1 type not recognised; skipping"
        exit 0
elif [ "$types" = swap ]; then
        debug "$1 is a swap partition; skipping"
        exit 0
elif [ "$types" = LVM2_member ]; then
        debug "$1 is a LVM member partition; skipping"
        exit 0
elif [ "$types" = crypto_LUKS ]; then
        debug "$1 is a LUKS partition; skipping"
        exit 0
elif [ "$types" = ntfs ]; then
        if type ntfs-3g >/dev/null 2>&1; then
                types='ntfs-3g ntfs'
        fi
elif [ -z "$types" ]; then
        if type cryptsetup >/dev/null 2>&1 && \
           cryptsetup luksDump "$partition" >/dev/null 2>&1; then
                debug "$1 is a LUKS partition; skipping"
                exit 0
        fi
        for type in $(grep -v nodev /proc/filesystems); do
                # hfsplus filesystems are mountable as hfs. Try hfs last so
                # that we can tell the difference.
                if [ "$type" = hfs ]; then
                        delaytypes="${delaytypes:+$delaytypes }$type"
                elif [ "$type" = fuseblk ]; then
                        if type ntfs-3g >/dev/null 2>&1; then
                                types="${types:+$types }ntfs-3g"
                        fi
                else
                        types="${types:+$types }$type"
                fi
        done
fi

tmpmnt=/var/lib/os-prober/mount
if [ ! -d "$tmpmnt" ]; then
        mkdir "$tmpmnt"
fi

mounted=
if type grub-mount >/dev/null 2>&1 && \
   type grub-probe >/dev/null 2>&1 && \
   grub-mount "$partition" "$tmpmnt" 2>/dev/null; then
        mounted=1
        type="$(grub-probe -d "$partition" -t fs)" || true
        if [ "$type" ]; then
                debug "mounted using GRUB $type filesystem driver"
        else
                debug "mounted using GRUB, but unknown filesystem?"
                type=fuseblk
        fi
else
        echo "Failed to probe $partition for filesystem type" >&2
        exit 1
fi

if [ "$mounted" ]; then
        for test in /usr/lib/os-probes/mounted/*; do
                debug "running subtest $test"
                if [ -f "$test" ] && [ -x "$test" ]; then
                        if "$test" "$partition" "$tmpmnt" "$type"; then
                                debug "os found by subtest $test"
                                if ! umount "$tmpmnt"; then
                                        warn "failed to umount $tmpmnt"
                                fi
                                case "$type" in
                                    btrfs)
                                        # umount to account for the bind-mount
                                        if [ -x "$tmpmnt/@/lib" ] && \
                                           ! umount $tmpmnt; then
                                                warn "failed to umount $tmpmnt"
                                        fi
                                        ;;
                                esac
                                rmdir "$tmpmnt" || true
                                exit 0
                        fi
                fi
        done
        if ! umount "$tmpmnt"; then
                warn "failed to umount $tmpmnt"
        fi
fi

rmdir "$tmpmnt" || true

# No tests found anything.
exit 1