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