tests/misc/md5sum-parallel.sh

   1 #!/bin/sh
   2 # Ensure that md5sum prints each checksum atomically
   3 # so that concurrent md5sums don't intersperse their output
   4
   5 # Copyright (C) 2009-2019 Free Software Foundation, Inc.
   6
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19
  20 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  21 print_ver_ md5sum
  22
  23 xargs -P2 </dev/null >/dev/null 2>&1 \
  24   || skip_ 'xargs -P is required'
  25
  26 (mkdir tmp && cd tmp && seq 500 | xargs touch)
  27
  28 # This will output at least 16KiB per process
  29 # and start 3 processes, with 2 running concurrently,
  30 # which triggers often on Fedora 11 at least.
  31 (find tmp tmp tmp -type f | xargs -n500 -P2 md5sum 2>err) |
  32 sed -n '/[0-9a-f]\{32\}  /!p' |
  33 grep . > /dev/null && fail=1
  34 compare /dev/null err || fail=1
  35
  36 Exit $fail