1#!/bin/sh
2
3command -v getarg >/dev/null || . /lib/dracut-lib.sh
4command -v getargbool >/dev/null || {
5    # Compatibility with older Dracut versions.
6    # With apologies to the Dracut developers.
7    getargbool() {
8        _default="$1"; shift
9        ! _b=$(getarg "$@") && [ -z "$_b" ] && _b="$_default"
10        if [ -n "$_b" ]; then
11            [ "$_b" = "0" ] && return 1
12            [ "$_b" = "no" ] && return 1
13            [ "$_b" = "off" ] && return 1
14        fi
15        return 0
16    }
17}
18
19OLDIFS="${IFS}"
20NEWLINE="
21"
22TAB="	"
23
24ZPOOL_IMPORT_OPTS=""
25if getargbool 0 zfs_force -y zfs.force -y zfsforce ; then
26    warn "ZFS: Will force-import pools if necessary."
27    ZPOOL_IMPORT_OPTS="${ZPOOL_IMPORT_OPTS} -f"
28fi
29
30# find_bootfs
31#   returns the first dataset with the bootfs attribute.
32find_bootfs() {
33    IFS="${NEWLINE}"
34    for dataset in $(zpool list -H -o bootfs); do
35        case "${dataset}" in
36            "" | "-")
37                continue
38                ;;
39            "no pools available")
40                IFS="${OLDIFS}"
41                return 1
42                ;;
43            *)
44                IFS="${OLDIFS}"
45                echo "${dataset}"
46                return 0
47                ;;
48        esac
49    done
50
51    IFS="${OLDIFS}"
52    return 1
53}
54
55# import_pool POOL
56#   imports the given zfs pool if it isn't imported already.
57import_pool() {
58    pool="${1}"
59
60    if ! zpool list -H "${pool}" > /dev/null 2>&1; then
61        info "ZFS: Importing pool ${pool}..."
62        # shellcheck disable=SC2086
63        if ! zpool import -N ${ZPOOL_IMPORT_OPTS} "${pool}" ; then
64            warn "ZFS: Unable to import pool ${pool}"
65            return 1
66        fi
67    fi
68
69    return 0
70}
71
72_mount_dataset_cb() {
73    # shellcheck disable=SC2154
74    mount -o zfsutil -t zfs "${1}" "${NEWROOT}${2}"
75}
76
77# mount_dataset DATASET
78#   mounts the given zfs dataset.
79mount_dataset() {
80    dataset="${1}"
81    mountpoint="$(zfs get -H -o value mountpoint "${dataset}")"
82    ret=0
83
84    # We need zfsutil for non-legacy mounts and not for legacy mounts.
85    if [ "${mountpoint}" = "legacy" ] ; then
86        mount -t zfs "${dataset}" "${NEWROOT}" || ret=$?
87    else
88        mount -o zfsutil -t zfs "${dataset}" "${NEWROOT}" || ret=$?
89
90        if [ "$ret" = "0" ]; then
91            for_relevant_root_children "${dataset}" _mount_dataset_cb || ret=$?
92        fi
93    fi
94
95    return "${ret}"
96}
97
98# for_relevant_root_children DATASET EXEC
99#   Runs "EXEC dataset mountpoint" for all children of DATASET that are needed for system bringup
100#   Used by zfs-generator.sh and friends, too!
101for_relevant_root_children() {
102    dataset="${1}"
103    exec="${2}"
104
105    zfs list -t filesystem -Ho name,mountpoint,canmount -r "${dataset}" |
106        (
107            _ret=0
108            while IFS="${TAB}" read -r dataset mountpoint canmount; do
109                [ "$canmount" != "on" ] && continue
110
111                case "$mountpoint" in
112                    /etc|/bin|/lib|/lib??|/libx32|/usr)
113                        # If these aren't mounted we may not be able to get to the real init at all, or pollute the dataset holding the rootfs
114                        "${exec}" "${dataset}" "${mountpoint}" || _ret=$?
115                        ;;
116                    *)
117                        # Up to the real init to remount everything else it might need
118                        ;;
119                esac
120            done
121            exit "${_ret}"
122        )
123}
124
125# ask_for_password
126#
127# Wraps around plymouth ask-for-password and adds fallback to tty password ask
128# if plymouth is not present.
129#
130# --cmd command
131#   Command to execute. Required.
132# --prompt prompt
133#   Password prompt. Note that function already adds ':' at the end.
134#   Recommended.
135# --tries n
136#   How many times repeat command on its failure.  Default is 3.
137# --ply-[cmd|prompt|tries]
138#   Command/prompt/tries specific for plymouth password ask only.
139# --tty-[cmd|prompt|tries]
140#   Command/prompt/tries specific for tty password ask only.
141# --tty-echo-off
142#   Turn off input echo before tty command is executed and turn on after.
143#   It's useful when password is read from stdin.
144ask_for_password() {
145    ply_tries=3
146    tty_tries=3
147    while [ "$#" -gt 0 ]; do
148        case "$1" in
149            --cmd) ply_cmd="$2"; tty_cmd="$2"; shift;;
150            --ply-cmd) ply_cmd="$2"; shift;;
151            --tty-cmd) tty_cmd="$2"; shift;;
152            --prompt) ply_prompt="$2"; tty_prompt="$2"; shift;;
153            --ply-prompt) ply_prompt="$2"; shift;;
154            --tty-prompt) tty_prompt="$2"; shift;;
155            --tries) ply_tries="$2"; tty_tries="$2"; shift;;
156            --ply-tries) ply_tries="$2"; shift;;
157            --tty-tries) tty_tries="$2"; shift;;
158            --tty-echo-off) tty_echo_off=yes;;
159            *) echo "ask_for_password(): wrong opt '$1'" >&2;;
160        esac
161        shift
162    done
163
164    { flock -s 9;
165        # Prompt for password with plymouth, if installed and running.
166        if plymouth --ping 2>/dev/null; then
167            plymouth ask-for-password \
168                --prompt "$ply_prompt" --number-of-tries="$ply_tries" | \
169                eval "$ply_cmd"
170            ret=$?
171        else
172            if [ "$tty_echo_off" = yes ]; then
173                stty_orig="$(stty -g)"
174                stty -echo
175            fi
176
177            i=1
178            while [ "$i" -le "$tty_tries" ]; do
179                [ -n "$tty_prompt" ] && \
180                    printf "%s [%i/%i]:" "$tty_prompt" "$i" "$tty_tries" >&2
181                eval "$tty_cmd" && ret=0 && break
182                ret=$?
183                i=$((i+1))
184                [ -n "$tty_prompt" ] && printf '\n' >&2
185            done
186            unset i
187            [ "$tty_echo_off" = yes ] && stty "$stty_orig"
188        fi
189    } 9>/.console_lock
190
191    [ "$ret" -ne 0 ] && echo "Wrong password" >&2
192    return "$ret"
193}
194