1#!/bin/sh
2
3mmc_init() {
4  base_dir="/media/hostfw"
5  ro_dir="${base_dir}/running-ro"
6  running_dir="${base_dir}/running"
7  prsv_dir="${base_dir}/prsv"
8  staging_dir="${base_dir}/staging"
9
10  if [ ! -d "${ro_dir}" ]; then
11    mkdir -p "${ro_dir}"
12  fi
13  if [ ! -d "${running_dir}" ]; then
14    mkdir -p ${running_dir}
15  fi
16  if [ ! -d "${prsv_dir}" ]; then
17    mkdir -p "${prsv_dir}"
18  fi
19  if [ ! -d "${staging_dir}" ]; then
20    mkdir -p "${staging_dir}"
21  fi
22
23  # Mount the image that corresponds to the boot label as read-only to be used
24  # to populate the running directory.
25  boot_label="$(fw_printenv -n bootside)"
26  if ! grep -q "${ro_dir}" /proc/mounts; then
27    mount ${base_dir}/hostfw-"${boot_label}" ${ro_dir} -o ro
28  fi
29
30  # Determine if the running dir contains the running version
31  running_label=""
32  running_label_file="${running_dir}/partlabel"
33  if [ -f "${running_label_file}" ]; then
34    running_label=$(cat ${running_label_file})
35  fi
36  if [ "${running_label}" != "${boot_label}" ]; then
37    # Copy off the preserved partitions
38    # A line in the pnor.toc looks like this:
39    # partition05=SECBOOT,0x00381000,0x003a5000,00,ECC,PRESERVED
40    rm -f ${prsv_dir}/*
41    if [ -f ${running_dir}/pnor.toc ]; then
42      prsvs=$(grep PRESERVED ${running_dir}/pnor.toc)
43      for prsv in ${prsvs}; do
44        prsv=${prsv##partition*=}
45        prsv=$(echo "${prsv}" | cut -d "," -f 1)
46        cp -p ${running_dir}/"${prsv}" ${prsv_dir}
47      done
48    fi
49
50    # Copy contents of running image to running dir
51    rm -f ${running_dir}/*
52    cp -p ${ro_dir}/* ${running_dir}/
53
54    # Restore the preserved partitions. Ignore error, there may be none.
55    cp -p ${prsv_dir}/* ${running_dir}/ 2>/dev/null || true
56    rm -f "${prsv_dir:?}/"*
57
58    # Clean up the staging dir in case of a failed update
59    rm -rf "${staging_dir:?}/"*
60
61    # Save the label
62    echo "${boot_label}" > "${running_label_file}"
63
64  fi
65
66  # Mount alternate dir
67  if [ "${boot_label}" = "a" ]; then
68    alternate_label="b"
69  else
70    alternate_label="a"
71  fi
72  alternate_dir="${base_dir}/alternate"
73  if [ ! -d "${alternate_dir}" ]; then
74    mkdir -p ${alternate_dir}
75  fi
76  if ! grep -q "${alternate_dir}" /proc/mounts; then
77    mount ${base_dir}/hostfw-${alternate_label} ${alternate_dir} -o ro
78  fi
79}
80
81mmc_patch() {
82  # Patching is disabled if field mode is set
83  if [ "$(fw_printenv fieldmode 2>/dev/null)" = "fieldmode=true" ]; then
84    return 0
85  fi
86
87  boot_label="$(fw_printenv -n bootside)"
88  if [ "${boot_label}" = "a" ]; then
89    alternate_label="b"
90  else
91    alternate_label="a"
92  fi
93
94  # Create patch directories
95  patch_dir="/media/hostfw/patch-"
96  running_patch_dir="${patch_dir}${boot_label}"
97  if [ ! -d "${running_patch_dir}" ]; then
98    mkdir -p "${running_patch_dir}"
99  fi
100  alternate_patch_dir="${patch_dir}${alternate_label}"
101  if [ ! -d "${alternate_patch_dir}" ]; then
102    mkdir -p "${alternate_patch_dir}"
103  fi
104
105  # Create patch symlinks
106  symlink_base="/usr/local/share"
107  if [ ! -d "${symlink_base}" ]; then
108    mkdir -p "${symlink_base}"
109  fi
110  hostfw_symlink_base="${symlink_base}/hostfw"
111  if [ ! -d "${hostfw_symlink_base}" ]; then
112    mkdir -p "${hostfw_symlink_base}"
113  fi
114
115  if [ "$(readlink -f "${symlink_base}/pnor")" != "${running_patch_dir}" ]; then
116    ln -s "${running_patch_dir}" "${symlink_base}/pnor"
117  fi
118  if [ "$(readlink -f "${hostfw_symlink_base}/running")" != "${running_patch_dir}" ]; then
119    ln -s "${running_patch_dir}" "${hostfw_symlink_base}/running"
120  fi
121  if [ "$(readlink -f "${hostfw_symlink_base}/alternate")" != "${alternate_patch_dir}" ]; then
122    ln -s "${alternate_patch_dir}" "${hostfw_symlink_base}/alternate"
123  fi
124}
125
126case "$1" in
127  mmc-init)
128    mmc_init
129    ;;
130  mmc-patch)
131    mmc_patch
132    ;;
133  *)
134    echo "Invalid argument"
135    exit 1
136    ;;
137esac
138