tests/split/filter.sh
#!/bin/sh
# Exercise split's new --filter option.

# Copyright (C) 2011-2025 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ split
require_sparse_support_ # for 'truncate --size=$LARGE'
xz --version || skip_ 'xz required'

for total_n_lines in 5 3000 20000; do
  seq $total_n_lines > in || framework_failure_
  for i in 2 51 598; do

    # Don't create too many files/processes.
    # Starting 10k (or even "only" 1500) processes would take a long time,
    # and would provide little added benefit.
    case $i:$total_n_lines in 2:5);; *) continue;; esac

    split -l$i --filter='xz -1 > $FILE.xz' in out- || fail=1
    xz -dc out-* > out || fail=1
    compare in out || fail=1
    rm -f out*
  done
  rm -f in
done

# Show how --elide-empty-files works with --filter:
# split does not run the command (and effectively elides the file)
# only when the output to that command would have been empty.
split -e -n 10 --filter='xz > $FILE.xz' /dev/null || fail=1
returns_ 1 stat x?? 2>/dev/null || fail=1

# Ensure this invalid combination is flagged
returns_ 1 split -n 1/2 --filter='true' /dev/null 2>&1 || fail=1

# Ensure SIGPIPEs sent by the children don't propagate back
# where they would result in a non zero exit from split.
yes | head -n200K | split -b1G --filter='head -c1 >/dev/null' || fail=1

# Ensure that "endless" input is ignored when all filters finish
for mode in '' 'r/'; do
  in_file='-'
  in_cmd='yes'
  if test "$mode" = ''; then
    in_file='zero.in'
    in_cmd='true'
    truncate -s10T "$FILE" || continue
  fi
  for N in 1 2; do
    rm -f x??.n || framework_failure_
    $in_cmd |
     timeout 10 split --filter='head -c1 >$FILE.n' -n $mode$N $in_file || fail=1
    # Also ensure we get appropriate output from each filter
    seq 1 $N | tr '0-9' 1 > stat.exp
    stat -c%s x??.n > stat.out || framework_failure_
    compare stat.exp stat.out || fail=1
  done
done

# Ensure that "endless" input _is_ processed for unbounded number of filters
for buf in 1000 1000000; do
  returns_ 124 timeout .5 sh -c \
    "yes | split --filter='head -c1 >/dev/null' -b $buf" || fail=1
done

Exit $fail
