| 1 | #!/sbin/openrc-run |
| 2 | |
| 3 | # Copyright (c) Natanael Copa |
| 4 | # This code is licensed under BSD-2-Clause |
| 5 | |
| 6 | # script that will mount image with modules |
| 7 | |
| 8 | depend() { |
| 9 | after dev-mount |
| 10 | before checkfs fsck hwdrivers modules hwclock dev sysfs |
| 11 | keyword -vserver -lxc |
| 12 | } |
| 13 | |
| 14 | # read kernel options |
| 15 | init_KOPT() { |
| 16 | for opt in $(cat /proc/cmdline 2>/dev/null); do |
| 17 | case "$opt" in |
| 18 | modloop=*|modloop_verify=*) |
| 19 | eval "KOPT_${opt%%=*}='${opt#*=}'" ;; |
| 20 | esac |
| 21 | done |
| 22 | } |
| 23 | |
| 24 | mountdirs() { |
| 25 | awk '$2 !~ /^\/(sys|proc|dev|run)/ && $2 != "/" {print $2}' /proc/mounts |
| 26 | } |
| 27 | |
| 28 | find_modloop() { |
| 29 | local dir="$1" |
| 30 | local kver=$(uname -r) |
| 31 | local oifs="$IFS" |
| 32 | IFS=$'\n' |
| 33 | set -- $(blkid "$dir"/boot/* "$dir"/*) |
| 34 | IFS="$oifs" |
| 35 | for line; do |
| 36 | img=${line%%:*} |
| 37 | verify_modloop "$img" || eerror "Failed to verify signature of $img!" |
| 38 | mount "$img" -o loop,ro /.modloop || continue |
| 39 | if [ -d /.modloop/modules/$kver ]; then |
| 40 | return 0 |
| 41 | fi |
| 42 | umount /.modloop |
| 43 | done |
| 44 | return 1 |
| 45 | } |
| 46 | |
| 47 | verify_modloop() { |
| 48 | local modloop=$1 key= |
| 49 | if ! yesno "${KOPT_modloop_verify:=yes}"; then |
| 50 | return 0 |
| 51 | fi |
| 52 | for key in /etc/apk/keys/*.pub; do |
| 53 | local sig=/var/cache/misc/${modloop##*/}.SIGN.RSA.${key##*/} |
| 54 | if [ -f "$sig" ]; then |
| 55 | if ! command -v openssl > /dev/null; then |
| 56 | ewarn "Missing openssl. Modloop verification disabled!" |
| 57 | return 0 |
| 58 | fi |
| 59 | einfo "Verifying modloop" |
| 60 | openssl dgst -sha1 -verify "$key" -signature "$sig" "$modloop" \ |
| 61 | >/dev/null 2>&1 || return 1 |
| 62 | fi |
| 63 | done |
| 64 | } |
| 65 | |
| 66 | find_backing_file() { |
| 67 | local dir="$1" |
| 68 | local dev=$(df -P "$dir" | tail -1 | awk '{print $1}') |
| 69 | cat /sys/block/${dev#/dev/}/loop/backing_file 2>/dev/null |
| 70 | } |
| 71 | |
| 72 | start() { |
| 73 | local modloop= mount_opts= modloop_dldir="/lib" |
| 74 | init_KOPT |
| 75 | |
| 76 | case "$KOPT_modloop" in |
| 77 | none) return 0;; |
| 78 | http://*|https://*|ftp://*) |
| 79 | modloop=$modloop_dldir/${KOPT_modloop##*/} |
| 80 | if [ ! -f "$modloop" ]; then |
| 81 | mkdir -p "$modloop_dldir" |
| 82 | wget -P "$modloop_dldir" "$KOPT_modloop" || eend 1 |
| 83 | fi |
| 84 | ;; |
| 85 | *) |
| 86 | for dir in $(mountdirs); do |
| 87 | if [ -f "$dir"/$KOPT_modloop ]; then |
| 88 | modloop="$dir/${KOPT_modloop##/}" |
| 89 | alpine_mnt="$dir" |
| 90 | break |
| 91 | fi |
| 92 | done |
| 93 | ;; |
| 94 | esac |
| 95 | |
| 96 | ebegin "Mounting modloop $modloop" |
| 97 | mkdir -p /.modloop |
| 98 | if [ -n "$modloop" ]; then |
| 99 | verify_modloop "$modloop" || eerror "Failed to verify signature of $modloop!" |
| 100 | mount -o loop,ro $modloop /.modloop |
| 101 | eend $? || return 1 |
| 102 | else |
| 103 | for dir in $(mountdirs); do |
| 104 | if find_modloop "$dir"; then |
| 105 | alpine_mnt="$dir" |
| 106 | break |
| 107 | fi |
| 108 | done |
| 109 | if [ -d /.modloop/modules/$(uname -r) ]; then |
| 110 | eend 0 |
| 111 | else |
| 112 | eend 1 || return 1 |
| 113 | fi |
| 114 | fi |
| 115 | |
| 116 | #use overlayfs if available and configured |
| 117 | if grep -q -w "overlay$" /proc/filesystems && [ ! -z ${unionfs_size+x} ]; then |
| 118 | ewarn "Use of unionfs_size is deprecated use overlay_size instead" |
| 119 | overlay_size="$unionfs_size" |
| 120 | fi |
| 121 | if grep -q -w "overlay$" /proc/filesystems && [ -n "$overlay_size" ]; then |
| 122 | ebegin "OverlayFS detected, mounting modloop rw" |
| 123 | [ "$overlay_size" != 0 ] && mount_ops="-o size=$overlay_size" |
| 124 | mkdir -p /.modoverlayfs /lib/modules |
| 125 | mount -t tmpfs $mount_ops tmpfs /.modoverlayfs |
| 126 | mkdir -p /.modoverlayfs/modules /.modoverlayfs/work |
| 127 | mount -t overlay -o upperdir=/.modoverlayfs/modules,lowerdir=/lib/modules:/.modloop/modules,workdir=/.modoverlayfs/work overlay /lib/modules |
| 128 | depmod -A |
| 129 | eend $? || return 1 |
| 130 | else |
| 131 | rm -rf /lib/modules && ln -sf /.modloop/modules /lib/ |
| 132 | fi |
| 133 | |
| 134 | # symlink firmware files |
| 135 | mkdir -p /lib/firmware |
| 136 | [ -z "$(ls -A /lib/firmware)" ] && [ -d /lib/modules/firmware ] && ln -s /lib/modules/firmware/* /lib/firmware/ 2>/dev/null |
| 137 | if [ -d $alpine_mnt/firmware ]; then |
| 138 | ebegin "Linking firmware from $alpine_mnt/firmware on top" |
| 139 | ln -sf $alpine_mnt/firmware/* /lib/firmware/ 2>/dev/null |
| 140 | eend $? |
| 141 | fi |
| 142 | return 0 |
| 143 | } |
| 144 | |
| 145 | stop() { |
| 146 | local ret=0 |
| 147 | local mnt; for mnt in /lib/modules /.modoverlayfs /.modloop; do |
| 148 | if mountinfo --quiet "$mnt"; then |
| 149 | ebegin "Unmounting $mnt" |
| 150 | umount -d "$mnt" || ret=1 |
| 151 | fi |
| 152 | done |
| 153 | |
| 154 | # cleanup orphaned symlinks from modloop |
| 155 | find /lib/firmware -maxdepth 1 -type l -exec sh -c 'readlink "$0" | grep -q "^/lib/modules/firmware" && rm "$0"' {} \; |
| 156 | [ "$( readlink /lib/modules )" = "/.modloop/modules" ] && rm /lib/modules |
| 157 | |
| 158 | eend $ret || return 1 |
| 159 | } |
| 160 | |