#!/bin/bash

# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Script to generate stackdumps from a machine or dmp files.


SCRIPT_ROOT=$(dirname $(readlink -f "$0"))
. "${SCRIPT_ROOT}/common.sh" || exit 1
. "${SCRIPT_ROOT}/remote_access.sh" || exit 1

assert_inside_chroot

MINIDUMP_DUMP=minidump_dump
MINIDUMP_STACKWALK=minidump_stackwalk
USING_REMOTE=0

DEFINE_string board "${DEFAULT_BOARD}" \
    "The board for which you are building autotest"
DEFINE_string breakpad_root "" \
    "Path to root of breakpad symbols if pre-existing symbols should be used"
DEFINE_boolean clean ${FLAGS_FALSE} \
    "Remove crash reports from remote system after showing stacks"

usage() {
  echo "usage: $(basename $0) [--remote=<IP>] [dump...]"
  echo "Specify either a remote IP of a ChromeOS device to gather "
  echo "all crash reports from, or list crash reports"
  exit 1
}

# Clean up remote access and temp files.
cleanup() {
  [ ${USING_REMOTE} -eq 1 ] && cleanup_remote_access
  rm -rf "${TMP}"
}

# Removes single quotes around parameter
# Arguments:
#   $1 - string which optionally has surrounding quotes
# Returns:
#   None, but prints the string without quotes.
remove_quotes() {
  echo "$1" | sed -e "s/^'//; s/'$//"
}

# Echoes kind of crash (minidump or kcrash).
get_kind() {
  local kind="${1##*.}"
  if [ "${kind}" = "dmp" ]; then
    kind="minidump"
  fi
  echo ${kind}
}

# Generate symbols for the given module list.
# Args:
#   $1 - file with a "module" per line.  A module is the full target's
#   path to a DSO or executable that was loaded during a crash.
generate_symbols() {
  local modules_file="$1"
  local modules=""
  local any_missing=0
  local module_count=0
  for module in $(sort -u "${modules_file}"); do
    local text_file="/build/${FLAGS_board}/${module}"
    local debug_file="/build/${FLAGS_board}/usr/lib/debug/${module}.debug"
    if [ -f "${text_file}" ] && [ -f "${debug_file}" ]; then
      modules="${modules} ${text_file}"
      module_count=$((module_count + 1))
    else
      if [ ${any_missing} -eq 0 ]; then
        warn "Some modules are missing debug information:"
        any_missing=1
      fi
      warn "* ${text_file}"
    fi
  done
  if [ ${module_count} -gt 0 ]; then
    info "Generating breakpad symbols for ${module_count} modules"
    "${CHROMITE_BIN}/cros_generate_breakpad_symbols" \
      --board=${FLAGS_board} ${modules}
  fi
}

main() {
  FLAGS "$@" || usage
  eval set -- "${FLAGS_ARGV}"

  local basename=$(basename "$0")
  TMP=$(mktemp -d /tmp/${basename}.XXXX)
  trap cleanup EXIT INT TERM
  if [ -n "${FLAGS_remote}" ]; then
    remote_access_init
    USING_REMOTE=1
    learn_board
    local crashes=""
    # File spec of all interesting crashes.  /home/chronos... is
    # listed separately from /mnt/stateful_partition/home/chronos/...
    # because the former may be a mount point for the cryptohome.
    # This allows us to get crashes from the currently logged in
    # user as well as from non-logged in users at once.  We remove
    # duplicate crashes (in case cryptohome is not mounted) below.
    local remote_crash_dirs=(
        "/var/spool/crash"
        "/home/user/*/crash"
        "/mnt/stateful_partition/home/user/*/crash"
    )
    local remote_crash_patterns=()
    for remote_crash_dir in "${remote_crash_dirs[@]}"; do
      remote_crash_patterns+=( "${remote_crash_dir}/*.{dmp,kcrash}" )
    done
    remote_sh "ls -1 ${remote_crash_patterns[*]}" 2> /dev/null
    local crashes=${REMOTE_OUT}
    # Remove duplicates.
    local unique_crashes=""
    local crash_count=0
    for crash in ${crashes}; do
      local crash_short=$(basename ${crash})
      if echo "${unique_crashes}" | grep -v -q "${crash_short}"; then
        unique_crashes="${unique_crashes} ${crash}"
        crash_count=$((crash_count + 1))
      fi
    done
    if [ ${crash_count} -eq 0 ]; then
      info "No crashes found on device."
      exit 0
    fi
    info "Copying back ${crash_count} crashes."
    crashes="${unique_crashes}"
    local filesfrom="${TMP}/filesfrom"
    declare -a dumps
    for crash in ${crashes}; do
      echo "${crash}" >> "${filesfrom}"
      dumps+=( "${TMP}/$(basename "${crash}")" )
    done
    set -- "$@" "${dumps[@]}"
    remote_rsync_from "${filesfrom}" "${TMP}"
    if [ ${FLAGS_clean} -eq ${FLAGS_TRUE} ]; then
      remote_sh "rm -rf ${remote_crash_dirs[*]}"
    fi
  else
    [[ $# -gt 0 ]] || usage
    [ -n "${FLAGS_board}" ] || die_notrace "--board is required."
  fi

  local modules_file="${TMP}/modules"
  for dump in "$@"; do
    dump=$(remove_quotes "${dump}")
    if [ $(get_kind "${dump}") == "minidump" ]; then
      # Find all DSOs and executables listed in lines like:
      #  (code_file)       = "/usr/lib/mylib.so"
      ${MINIDUMP_DUMP} "${dump}" 2>/dev/null \
        | grep code_file \
        | sed 's/.*= "\(.*\)"/\1/' \
        >> "${modules_file}"
    fi
  done

  if [ -z "${FLAGS_breakpad_root}" ]; then
    generate_symbols "${modules_file}"
    FLAGS_breakpad_root=/build/${FLAGS_board}/usr/lib/debug/breakpad
  fi

  for dump in "$@"; do
    dump=$(remove_quotes "${dump}")
    if [ $(get_kind "${dump}") = "minidump" ]; then
      info "Dumping stack for $(basename "${dump}")" \
        "with ${FLAGS_breakpad_root}:"
      ${MINIDUMP_STACKWALK} "${dump}" "${FLAGS_breakpad_root}" 2> /dev/null
    else
      info "Dumping kcrash $(basename "${dump}"):"
      cat "${dump}"
    fi
    echo ""
  done
}

main "$@"