Send patches - preferably formatted by git format-patch - to patches at archlinux32 dot org.
summaryrefslogtreecommitdiff
path: root/archiso/hooks/archiso
blob: f446bd2347b5d86355e9397aa57ca68dbcc91d9c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
# Initialize loopback device logic (we using on-demand mode)
# args: none
_init_loop_dev() {
    loop_dev_count=99
    loop_dev_range=$(cat /sys/block/loop0/range)
    loop_dev_minor=$((loop_dev_count*loop_dev_range))
}

# Call this function before _make_loop_dev() each time.
# args: none
_next_loop_dev() {
    loop_dev_count=$((loop_dev_count+1))
    loop_dev_minor=$((loop_dev_count*loop_dev_range))
}

# Setup a loopback device for image passed as argument and echo the path to loopback device used.
# args: /path/to/image_file
_make_loop_dev() {
    local img="${1}"
    mknod /dev/loop${loop_dev_count} b 7 ${loop_dev_minor} &> /dev/null
    losetup /dev/loop${loop_dev_count} "${img}" &> /dev/null
    echo /dev/loop${loop_dev_count}
}

# args: source, mountpoint
_mnt_fs() {
    local img="${1}"
    local mnt="${2}"
    local img_fullname="${img##*/}";
    local img_name="${img_fullname%%.*}"
    local dm_snap_name="${dm_snap_prefix}_${img_name}"
    local ro_dev ro_dev_size ro_dev_fs_type rw_dev

    mkdir -p "${mnt}"

    _next_loop_dev
    ro_dev=$(_make_loop_dev "${img}")
    ro_dev_size=$(blockdev --getsz ${ro_dev})
    ro_dev_fs_type=$(blkid -o value -s TYPE -p ${ro_dev} 2> /dev/null)


    if [[ "${cow_persistent}" == "P" ]]; then
        if [[ -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" ]]; then
            msg ":: Found '/run/archiso/cowspace/${cow_directory}/${img_name}.cow', using as persistent."
        else
            msg ":: Creating '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' as persistent."
            dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${ro_dev_size} &> /dev/null
        fi
    else
        if [[ -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" ]]; then
            msg ":: Found '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' but non-persistent requested, removing."
            rm -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow"
        fi
        msg ":: Creating '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' as non-persistent."
        dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${ro_dev_size} &> /dev/null
    fi

    _next_loop_dev
    rw_dev=$(_make_loop_dev "/run/archiso/cowspace/${cow_directory}/${img_name}.cow")

    echo "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} 8" | dmsetup create ${dm_snap_name}

    msg ":: Mounting '/dev/mapper/${dm_snap_name}' (${ro_dev_fs_type}) to '${mnt}'"
    if ! mount -t "${ro_dev_fs_type}" "/dev/mapper/${dm_snap_name}" "${mnt}" ; then
        echo "ERROR: while mounting '/dev/mapper/${dm_snap_name}' to '${mnt}'"
        launch_interactive_shell
    fi
}

# args: /path/to/image_file, mountpoint
_mnt_sfs() {
    local img="${1}"
    local mnt="${2}"
    local img_fullname="${img##*/}";

    mkdir -p "${mnt}"

    if [[ "${copytoram}" == "y" ]]; then
        msg -n ":: Copying squashfs image to RAM..."
        if ! cp "${img}" "/run/archiso/copytoram/${img_fullname}" ; then
            echo "ERROR: while copy '${img}' to '/run/archiso/copytoram/${img_fullname}'"
            launch_interactive_shell
        fi
        img="/run/archiso/copytoram/${img_fullname}"
        msg "done."
    fi
    _next_loop_dev
    msg ":: Mounting '${img}' (SquashFS) to '${mnt}'"
    if ! mount -r -t squashfs $(_make_loop_dev "${img}") "${mnt}" &> /dev/null ; then
        echo "ERROR: while mounting '${img}' to '${mnt}'"
        launch_interactive_shell
    fi
}

# args: device, mountpoint, flags
_mnt_dev() {
    local dev="${1}"
    local mnt="${2}"
    local flg="${3}"

    mkdir -p "${mnt}"

    msg ":: Mounting '${dev}' to '${mnt}'"

    while ! poll_device "${dev}" 30; do
        echo "ERROR: '${dev}' device did not show up after 30 seconds..."
        echo "   Falling back to interactive prompt"
        echo "   You can try to fix the problem manually, log out when you are finished"
        launch_interactive_shell
    done

    if mount "${flg}" "${dev}" "${mnt}"; then
        msg ":: Device '${dev}' mounted successfully."
    else
        echo "ERROR; Failed to mount '${dev}'"
        echo "   Falling back to interactive prompt"
        echo "   You can try to fix the problem manually, log out when you are finished"
        launch_interactive_shell
    fi
}

_verify_checksum() {
    local _status
    cd "/run/archiso/bootmnt/${archisobasedir}"
    md5sum -c checksum.md5 > /checksum.log 2>&1
    _status=$?
    cd "${OLDPWD}"
    return ${_status}
}

run_hook() {
    modprobe loop

    [[ -z "${arch}" ]] && arch="$(uname -m)"
    [[ -z "${cowspace_size}" ]] && cowspace_size="75%"
    [[ -z "${copytoram_size}" ]] && copytoram_size="75%"
    [[ -z "${archisobasedir}" ]] && archisobasedir="arch"
    [[ -z "${dm_snap_prefix}" ]] && dm_snap_prefix="arch"
    [[ -z "${archisodevice}" ]] && archisodevice="/dev/disk/by-label/${archisolabel}"

    if [[ -z "${aitab}" ]]; then
        aitab="/run/archiso/bootmnt/${archisobasedir}/aitab"
    else
        aitab="/run/archiso/bootmnt/${aitab}"
    fi

    if [[ -n "${cow_label}" ]]; then
        cow_device="/dev/disk/by-label/${cow_label}"
        [[ -z "${cow_persistent}" ]] && cow_persistent="P"
    elif [[ -n "${cow_device}" ]]; then
        [[ -z "${cow_persistent}" ]] && cow_persistent="P"
    else
        cow_persistent="N"
    fi

    [[ -z "${cow_directory}" ]] && cow_directory="persistent_${archisolabel}/${arch}"

    # set mount handler for archiso
    mount_handler="archiso_mount_handler"
}

# This function is called normally from init script, but it can be called
# as chain from other mount handlers.
# args: /path/to/newroot
archiso_mount_handler() {
    local newroot="${1}"

    _init_loop_dev

    _mnt_dev "${archisodevice}" "/run/archiso/bootmnt" "-r"

    if [[ ! -f "${aitab}" ]]; then
        echo "ERROR: '${aitab}' file does not exist."
        echo "   Falling back to interactive prompt"
        echo "   You can try to fix the problem manually, log out when you are finished"
        launch_interactive_shell
    fi

    if [[ "${checksum}" == "y" ]]; then
        if [[ -f "/run/archiso/bootmnt/${archisobasedir}/checksum.md5" ]]; then
            msg -n ":: Self-test requested, please wait..."
            if _verify_checksum; then
                msg "done. Checksum is OK, continue booting."
            else
                echo "ERROR: one or more files are corrupted"
                echo "see /checksum.log for details"
                launch_interactive_shell
            fi
        else
            echo "ERROR: checksum=y option specified but checksum.md5 not found"
            launch_interactive_shell
        fi
    fi

    if [[ "${copytoram}" == "y" ]]; then
        msg ":: Mounting /run/archiso/copytoram (tmpfs) filesystem, size=${copytoram_size}"
        mkdir -p /run/archiso/copytoram
        mount -t tmpfs -o "size=${copytoram_size}",mode=0755 copytoram /run/archiso/copytoram
    fi

    if [[ -n "${cow_device}" ]]; then
        _mnt_dev "${cow_device}" "/run/archiso/cowspace" "-r"
        mount -o remount,rw "/run/archiso/cowspace"
    else
        msg ":: Mounting /run/archiso/cowspace (tmpfs) filesystem, size=${cowspace_size}..."
        mkdir -p /run/archiso/cowspace
        mount -t tmpfs -o "size=${cowspace_size}",mode=0755 cowspace /run/archiso/cowspace
    fi
    mkdir -p "/run/archiso/cowspace/${cow_directory}"

    local aitab_img aitab_mnt aitab_arch aitab_sfs_comp aitab_fs_type aitab_fs_size
    while read aitab_img aitab_mnt aitab_arch aitab_sfs_comp aitab_fs_type aitab_fs_size; do
        [[ "${aitab_img#\#}" != "${aitab_img}" ]] && continue
        [[ "${aitab_arch}" != "any" && "${aitab_arch}" != "${arch}" ]] && continue
        if [[ "${aitab_fs_type}" != "none" ]]; then
            if [[ "${aitab_sfs_comp}" != "none" ]]; then
                _mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.fs.sfs" "/run/archiso/sfs/${aitab_img}"
                _mnt_fs "/run/archiso/sfs/${aitab_img}/${aitab_img}.fs" "${newroot}${aitab_mnt}"
            else
                _mnt_fs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.fs" "${newroot}${aitab_mnt}"
            fi
        else
            _mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.sfs" "${newroot}${aitab_mnt}"
        fi
    done < "${aitab}"

    if [[ "${copytoram}" == "y" ]]; then
        umount /run/archiso/bootmnt
    fi
}

# vim:ft=sh:ts=4:sw=4:et: