find-first-fail: find failing file fragment.
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Ole Tange
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c445e9352f
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@ -5,12 +5,14 @@
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=head1 NAME
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find-first-fail - find the lowest argument that makes a command fail
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find-first-fail - fine function for finding first failing file fragment
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=head1 SYNOPSIS
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B<find-first-fail> [-2] [-q] [-s I<start>] I<command>
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B<find-first-fail> [-2] [-q] [-s I<start>] [-v] I<command>
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B<find-first-fail> -f I<inputfile> [-s I<start>] [-q] [-v] I<command>
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=head1 DESCRIPTION
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@ -26,24 +28,37 @@ value and the previous value.
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If the I<start> value fails, B<find-first-fail> instead searches for
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the highest value that I<command> fails for.
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If given a file with B<-f> B<find-first-fail> will find minimal
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section in the file the command fails for.
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=head1 OPTIONS
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=over 4
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=item B<-f> I<inputfile>
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Search for the bad line in I<inputfile>. Use B<-s> to tell how many
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lines should be treated as header (e.g. 1 if a normal CSV file with a
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header).
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=item B<-2>
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Instead of passing the command a single argument, give the command 2
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arguments: I<from> I<to>.
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=item B<-q>
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Quiet. Ignore output from I<command>.
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=item B<-s I<start>>
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Start searching from the value I<start>. Normally searching will start from the value 1.
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=item B<-v>
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Verbose. Show the commands being run.
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@ -66,6 +81,7 @@ This is a silly way to find the last file (namely 800):
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touch {1..800}
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find-first-fail ls
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=head2 Test a bash function
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Test how long an argument /bin/echo can take
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@ -76,6 +92,7 @@ Test how long an argument /bin/echo can take
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}
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find-first-fail singleecho
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=head2 Test a bash function that takes from and to as arguments
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Use a function that takes two arguments. It finds the line number
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@ -87,6 +104,7 @@ after HOME=.
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}
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find-first-fail -2 -q greplines
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=head2 Test complex command and show what is run
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Complex commands can also be run:
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@ -108,6 +126,24 @@ you find the limits?
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find-first-fail -s 200 myprog
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=head2 Find minimal failing CSV file
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Assume: example.csv
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MyHeader
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4
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3
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5
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100
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3
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myparser() { perl -ne 'if($_ > 10) { exit 1 }' "$@"; }
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To identify the minimal CSV file that causes myparser to fail:
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find-first-fail -f example.csv -s1 myparser
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=head1 AUTHOR
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Copyright (C) 2020 Ole Tange,
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@ -142,7 +178,6 @@ find-first-fail() {
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_find-first-fail() {
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local low=$1
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local high=$2
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# echo $low-$high
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if [ $low -gt $(($high - 2)) ]; then
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echo $low
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return
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@ -169,10 +204,8 @@ find-first-fail() {
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# _inner_run is needed if cmd is complex like:
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# perl -e 'exit( (shift) + (shift) > 10)'
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if $opt2 ; then
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$verbose && echo "${cmd[@]}" "$a" "$b"
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"${cmd[@]}" "$a" "$b"
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else
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$verbose && echo "${cmd[@]}" "$b"
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"${cmd[@]}" "$b"
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fi
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}
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@ -180,28 +213,16 @@ find-first-fail() {
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local b="$2"
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shift
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shift
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# echo "a=$a b=$b $@"
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local cmd=("$@")
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if $opt2 ; then
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$verbose && echo "$a<x<$b: ${cmd[@]}" "$a" "$b" >&2
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else
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$verbose && echo "$a<x<$b: ${cmd[@]}" "$b" >&2
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fi
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eval "$not" _inner_run "$quiet"
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}
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local opt2=false
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local quiet=""
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local start=1
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local verbose=false
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# Parse and remove options
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while getopts "2qs:v" options; do
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case "${options}" in
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(2) opt2=true;;
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(q) quiet=">/dev/null 2>/dev/null";;
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(s) start="$OPTARG";;
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(v) verbose=true;;
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(-) break;;
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esac
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done
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shift $(( OPTIND - 1))
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_find_in_arg() {
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# If function(1) = false: run 'not function()' instead
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local not
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if _run "$start" "$start" "$@" ; then
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@ -213,13 +234,13 @@ find-first-fail() {
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# exponential search for the first value that is false
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# low = previous value (function($low) == true)
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# high = low * 2 (function($high) == false)
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local high=$start
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local low
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local high=$(( $start*2 ))
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local low=$start
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while _run $start $high "$@" ; do
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low=$high
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high=$(( $high*2 ))
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if [ $high -gt 4611686018427387900 ] ; then
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echo "$0: Error: exit value does not change of '$@'" >&2
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echo "find-first-fail: Error: exit value does not change of '$@'" >&2
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return
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fi
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done
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@ -228,8 +249,132 @@ find-first-fail() {
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# high = tested fail
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# Search low..high
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# echo "low: $low high: $high not: $not"
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_find-first-fail $low $high "$@" 2>/dev/null
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unset low high start
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_find-first-fail $low $high "$@"
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unset low high start quiet
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}
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#### find-first-fail-file
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_run_file() {
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# build $tmpfile as line a..b
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# run:
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# cmd $tmpfile
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# Output is ignored if $quiet
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# Exit value is negated if $not
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_inner_run() {
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# _inner_run is needed if cmd is complex like:
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# perl -e 'exit( (shift) + (shift) > 10)'
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"${cmd[@]}" "$tmp"
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}
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local a="$1"
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local b="$2"
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shift
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shift
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local cmd=("$@")
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local tmp=`tempfile -p fff`
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$verbose && echo "$a<x<$b: ${cmd[@]}" "$tmp" >&2
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# Build file of line a..b
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perl -ne "($start and 1..$start) and print" "$inputfile" > "$tmp";
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perl -ne "$a..$b and print" "$inputfile" >> "$tmp";
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eval "$not" _inner_run "$quiet"
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# Postpone exit code
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local _exit="$?"
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rm "$tmp"
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return "$_exit"
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}
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_find-low-file() {
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local low=$1
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local high=$2
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if [ $low -gt $(($high - 2)) ]; then
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global_low=$low
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return
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fi
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shift
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shift
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local middle=$(( ( $low + $high ) / 2 ))
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if _run_file $middle $global_high "$@" ; then
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low=$middle
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else
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high=$middle
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fi
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_find-low-file $low $high "$@"
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}
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_find-high-file() {
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local low=$1
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local high=$2
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if [ $low -gt $(($high - 2)) ]; then
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global_high=$high
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return
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fi
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shift
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shift
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local middle=$(( ( $low + $high ) / 2 ))
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if _run_file $global_low $middle "$@" ; then
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high=$middle
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else
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low=$middle
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fi
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_find-high-file $low $high "$@"
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}
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_find_in_file() {
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# If function(1) = false: run 'not function()' instead
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local not
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local global_low=$(($start+1))
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if [ ! -e "$inputfile" ] ; then
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echo "find-first-fail: Error: File not found '$inputfile'" >&2
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return 1
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fi
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local global_high=$(wc -l < $inputfile)
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if _run_file "$global_low" "$global_high" "$@" ; then
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not=''
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else
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not='!'
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fi
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# Binary search for $global_low
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_find-low-file $global_low $global_high "$@"
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_find-high-file $global_low $global_high "$@"
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perl -ne "($start and 1..$start) and print" "$inputfile"
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perl -ne "$global_low..$global_high and print" "$inputfile"
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unset low high start quiet
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}
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local opt2=false
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local optf=false
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local inputfile
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local quiet=""
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local start
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local verbose=false
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unset OPTIND
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# Parse and remove options
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while getopts "2f:qs:v" options; do
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case "${options}" in
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(2) opt2=true;;
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(f) optf=true; inputfile="$OPTARG";;
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(q) quiet=">/dev/null 2>/dev/null";;
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(s) start="$OPTARG";;
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(v) verbose=true;;
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(-) break;;
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esac
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done
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shift $(( OPTIND - 1))
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unset OPTIND
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if $optf; then
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if [ -z "$start" ] ; then
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start=0
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fi
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_find_in_file "$@";
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else
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if [ -z "$start" ] ; then
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start=1
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fi
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_find_in_arg "$@";
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fi
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}
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if [ -z "$*" ] ; then
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@ -240,3 +385,4 @@ else
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# find-first-fail command
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find-first-fail "$@"
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fi
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@ -4,6 +4,7 @@ test_unexported_function() {
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myprog() { perl -e 'exit (shift > 12345678)' "$@"; }
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# myprog is a function, so source find-first-fail first
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. `which find-first-fail`
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echo Find 12345678 in unexported function
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find-first-fail myprog
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}
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@ -11,6 +12,7 @@ test_exported_function() {
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myprog() { perl -e 'exit (shift > 12345678)' "$@"; }
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# myprog is an exported function
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export -f myprog
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echo Find 12345678
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find-first-fail myprog
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}
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@ -19,9 +21,9 @@ test_startvalue() {
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myprog() { perl -e '$a=shift;if($a <= 123) { exit 0; }
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else { exit ($a <= 12345678) }' "$@"; }
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export -f myprog
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# Finds 123
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echo Find 123
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find-first-fail myprog
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# Finds 12345678
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echo Find 12345678
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find-first-fail -s 200 myprog
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}
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@ -29,10 +31,40 @@ test_s_v_12() {
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# Multiple options
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myprog() { perl -e 'exit (shift > 12)' "$@"; }
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export -f myprog
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echo Find 12 with progress
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find-first-fail -v -s 10 myprog
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echo Find 12 with progress quiet
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find-first-fail -v -q -s 10 myprog
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}
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test_file() {
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tmp=`tempfile`
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echo Header > $tmp
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seq 100 >> $tmp
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10_to_15() { grep ^10$ $1 && grep ^15$ $1; }
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export -f 10_to_15
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echo 10..15
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find-first-fail -s1 -qf $tmp 10_to_15
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echo not 10..15
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find-first-fail -s1 -qf $tmp not 10_to_15
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rm $tmp
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}
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test_header() {
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tmp=`tempfile`
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echo Header > $tmp
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seq 10 >> $tmp
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echo 1000 >> $tmp
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seq 10 >> $tmp
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myparser() { perl -ne 'if($_ > 100) { exit 1 }' "$@"; }
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export -f myparser
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echo Should give:
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echo Header
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echo 1000
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find-first-fail -s1 -f $tmp myparser
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}
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export -f $(compgen -A function | grep test_)
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compgen -A function | grep test_ | LC_ALL=C sort |
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parallel --timeout 1000% --tag -k --joblog /tmp/jl-`basename $0` '{} 2>&1'
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