iankelling.org Git - log-quiet/blob - logq-function

   1 #!/bin/bash
   2 # Copyright (C) 2014-2016 Ian Kelling
   3
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15 logq () {
  16   local help="Usage: logq [-h|--help] COMMAND [ARG...]
  17
  18 Log Quietly. Run COMMAND with ARGs, log to temp file. Output return code,
  19 command, and log path. Tail log if there is a failure.
  20 Follows output format of logsave."
  21
  22   if [[ $1 == --help || $1 == -h ]]; then
  23     echo "$help"
  24     return
  25   fi
  26   if [[ $# == 0 ]]; then
  27     echo "error: need 1 or more arguments
  28 $help"
  29     return 1
  30   fi
  31
  32   # deliniate arguments, so spaces aren't ambiguous
  33   local index=0
  34   local x prettycommand
  35   for x in "$@"; do
  36     prettycommand+="[$index]$x "
  37     index=$(( index+1 ))
  38   done
  39
  40   local file="$*"
  41   file="$(mktemp -d)/${file//[[:space:]\/]/_}"
  42   # give us ~20 char filename max
  43   file="${file:0:40}"
  44
  45   printf "%s\n%s\n\n" "Log of $prettycommand" "$(date)" >"$file"
  46
  47   if [[ $- != *x* ]]; then
  48     echo "log $file = $@"
  49   fi
  50
  51   # we will propagate any errors
  52   local logq_ret=$(
  53     set +e
  54     trap ERR
  55     "$@" &>> "$file"
  56     echo $?
  57         )
  58   printf "\n%s\n%s\n" "$(date)" "----------------" >> "$file"
  59
  60   if [[ $logq_ret != 0 ]]; then
  61     x="tail -n 100 $file"
  62     if [[ $- != *x* ]]; then
  63       echo "logq failure. $x :"
  64     fi
  65     $x
  66   fi
  67   return $logq_ret
  68 }