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      1 #!/system/bin/sh
      2 
      3 # Copyright (C) 2014 The Android Open Source Project
      4 #
      5 # Licensed under the Apache License, Version 2.0 (the "License");
      6 # you may not use this file except in compliance with the License.
      7 # You may obtain a copy of the License at
      8 #
      9 #      http://www.apache.org/licenses/LICENSE-2.0
     10 #
     11 # Unless required by applicable law or agreed to in writing, software
     12 # distributed under the License is distributed on an "AS IS" BASIS,
     13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 # See the License for the specific language governing permissions and
     15 # limitations under the License.
     16 
     17 # Run tasks periodically.
     18 # Usage: $0 <delay_seconds> <timeout_seconds> <task_name> <task_binary>
     19 #
     20 # Executes task <task_name> by running <task_binary> every <delay_seconds>.
     21 
     22 set -e -u
     23 
     24 SCRIPT_NAME="$(basename "$0")"
     25 CHECK_DELAY=300  # Check every 5 minutes.
     26 KILL_DELAY=10    # How long to let the job clean up after a timeout.
     27 # Let the unittests override.
     28 : ${SPOOL_DIR:=/data/misc/crash_reporter/spool/cron-lite}
     29 
     30 loginfo() {
     31   log -p i -t "${SCRIPT_NAME}" "$@"
     32 }
     33 
     34 trap "loginfo 'exiting'" EXIT
     35 
     36 check_and_fix_spool_paths() {
     37   # Avoid weird spool paths if possible.
     38   rm -f "$(dirname "${SPOOL_DIR}")" "${SPOOL_DIR}" 2>/dev/null || :
     39   mkdir -p "${SPOOL_DIR}"
     40   if [ ! -O "${SPOOL_DIR}" -o ! -d "${SPOOL_DIR}" ]; then
     41     loginfo "Spool directory is damaged. Aborting!"
     42     exit 1
     43   fi
     44 }
     45 
     46 main() {
     47   local delay="$1"
     48   local timeout="$2"
     49   local name="$3"
     50   local spool_file="${SPOOL_DIR}/${name}"
     51   shift 3
     52 
     53   [ -z "${delay}" ] && exit 1
     54   [ -z "${timeout}" ] && exit 1
     55   [ -z "${name}" ] && exit 1
     56   [ $# -eq 0 ] && exit 1
     57   check_and_fix_spool_paths
     58 
     59   while true; do
     60     # Allow the sleep to be killed manually without terminating the handler.
     61     # Send stderr to /dev/null to suppress the shell's "Terminated" message.
     62     sleep $(( CHECK_DELAY + KILL_DELAY )) 2>/dev/null || true
     63 
     64     [ ! -e "${spool_file}" ] && touch "${spool_file}"
     65 
     66     local last_rotation="$(stat -c "%Y" "${spool_file}" 2>/dev/null || echo 0)"
     67     local now="$(date +%s)"
     68     local time_diff=$((now - last_rotation))
     69 
     70     if [ ${time_diff} -gt ${delay} ]; then
     71       rm "${spool_file}" || true
     72       touch "${spool_file}"
     73       loginfo "${name}: running $*"
     74       timeout -k ${KILL_DELAY} ${timeout} "$@" || true
     75       loginfo "${name}: job completed"
     76     fi
     77   done
     78 }
     79 
     80 main "$@"
     81