Fixed bug #42089: --results with arg > 256 chars.

doc/release_new_version

@@ -220,18 +220,26 @@ GNU Parallel 20140422 ('') has been released. It is available for download at: h
 
 New in this release:
 
+* GNU Parallel was cited in: Proactive System for Digital Forensic Investigation http://dspace.library.uvic.ca:8080/bitstream/handle/1828/5237/Alharbi_Soltan_PhD_2014.pdf
+
 * GNU Parallel was cited in: Beyond MAP estimation with the track-oriented multiple hypothesis tracker http://ieeexplore.ieee.org/xpl/abstractReferences.jsp?tp=&arnumber=6766651&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6766651
 
 * GNU Parallel was cited in: Prokka: rapid prokaryotic genome annotation http://bioinformatics.oxfordjournals.org/content/early/2014/03/18/bioinformatics.btu153.short
 
 * GNU Parallel was used (unfortunately with improper citation) in: Perspectives in magnetic resonance: NMR in the post-FFT era http://www.sciencedirect.com/science/article/pii/S1090780713003054
 
+* GNU Parallel is used in https://github.com/cc2qe/speedseq
+
+* Batch XML validation at the command line. http://horothesia.blogspot.dk/2014/04/batch-xml-validation-at-command-line.html
+
 * Org-mode with Parallel Babel http://draketo.de/english/emacs/parallel-babel#sec-2
 
 * Speeding Up Grep Log Queries with GNU Parallel http://www.cybersecurity.io/speeding-grep-queries-gnu-parallel/
 
 * How to run tbss_2_reg in parallel http://tadpolebrainimaging.blogspot.dk/2014/03/how-to-run-tbss2reg-in-parallel.html
 
+* GNU parallel example: blastn https://asciinema.org/a/8775
+
 * Iterative DNS Brute Forcing http://www.room362.com/blog/2014/02/19/iterative-dns-brute-forcing/
 
 * Ejecutando comandos en paralelo http://jesusmercado.com/guias/ejecutando-comandos-en-paralelo/

src/parallel

@@ -4309,7 +4309,17 @@ sub openoutputfiles {
 	my $args_as_dirname = $self->{'commandline'}->args_as_dirname();
 	# prefix/name1/val1/name2/val2/
 	my $dir = $opt::results."/".$args_as_dirname;
-	File::Path::mkpath($dir);
+	if(eval{ File::Path::mkpath($dir); }) {
+	    # OK
+	} else {
+	    # mkpath failed: Argument probably too long.
+	    # Set $Global::max_file_length
+	    max_file_name_length($opt::results);
+	    $args_as_dirname = $self->{'commandline'}->args_as_dirname();
+	    # prefix/name1/val1/name2/val2/
+	    $dir = $opt::results."/".$args_as_dirname;
+	    File::Path::mkpath($dir);
+	}
 	# prefix/name1/val1/name2/val2/stdout
 	$outname = "$dir/stdout";
 	if(not open($outfhw, "+>", $outname)) {
@@ -4399,6 +4409,36 @@ sub openoutputfiles {
     }
 }
 
+sub max_file_name_length {
+    # Figure out the max length of a subdir and the max total length
+    # Ext4 = 255,130816
+    my $testdir = shift;
+
+    my $upper = 8_000_000;
+    my $len = 8;
+    my $dir="x"x$len;
+    do {
+	rmdir($testdir."/".$dir);
+	$len *= 16;
+	$dir="x"x$len;
+    } while (mkdir $testdir."/".$dir);
+    # Then search for the actual max length between $len/16 and $len                                                              
+    my $min = $len/16;
+    my $max = $len;
+    while($max-$min > 5) {
+	my $test = int(($min+$max)/2);
+	$dir="x"x$test;
+	if(mkdir $testdir."/".$dir) {
+	    rmdir($testdir."/".$dir);
+	    $min = $test;
+	} else {
+	    $max = $test;
+	}
+    }
+    $Global::max_file_length = $min;
+    return $min;
+}
+
 sub set_fh {
     # Set file handle
     my ($self, $fd_no, $key, $fh) = @_;
@@ -5625,6 +5665,7 @@ sub args_as_dirname {
     # Returns:
     #  all unmodified arguments joined with '/' (similar to {})
     #  \t \0 \\ and / are quoted
+    # If $Global::max_file_length: Keep labels < $Global::max_file_length
     my $self = shift;
     my @res = ();
 
@@ -5637,7 +5678,11 @@ sub args_as_dirname {
 		       $s =~ s/\\/\\\\/g;
 		       $s =~ s/\t/\\t/g;
 		       $s =~ s/\0/\\0/g;
-		       $s =~ s:/:\\_:g; $s; }
+		       $s =~ s:/:\\_:g;
+		       if($Global::max_file_length) {
+			   $s = substr($s,0,$Global::max_file_length);
+		       }
+		       $s; }
 		 $rec_ref->[$n-1]->orig());
 	}
     }

src/parallel.pod

@@ -1122,12 +1122,12 @@ E.g:
 will generate the files:
 
   foo/a/I/b/III/stderr
-  foo/a/I/b/IIII/stderr
-  foo/a/II/b/III/stderr
-  foo/a/II/b/IIII/stderr
   foo/a/I/b/III/stdout
+  foo/a/I/b/IIII/stderr
   foo/a/I/b/IIII/stdout
+  foo/a/II/b/III/stderr
   foo/a/II/b/III/stdout
+  foo/a/II/b/IIII/stderr
   foo/a/II/b/IIII/stdout
 
 and
@@ -1137,12 +1137,12 @@ and
 will generate the files:
 
   foo/1/I/2/III/stderr
-  foo/1/I/2/IIII/stderr
-  foo/1/II/2/III/stderr
-  foo/1/II/2/IIII/stderr
   foo/1/I/2/III/stdout
+  foo/1/I/2/IIII/stderr
   foo/1/I/2/IIII/stdout
+  foo/1/II/2/III/stderr
   foo/1/II/2/III/stdout
+  foo/1/II/2/IIII/stderr
   foo/1/II/2/IIII/stdout
 
 See also B<--files>, B<--header>, B<--joblog>.

testsuite/tests-to-run/parallel-local-3s.sh

@@ -4,6 +4,13 @@
 # Each should be taking 3-10s and be possible to run in parallel
 # I.e.: No race conditions, no logins
 cat <<'EOF' | sed -e 's/;$/; /;s/$SERVER1/'$SERVER1'/;s/$SERVER2/'$SERVER2'/' | stdout parallel -k -j4 -L1
+echo '### bug #42089: --results with arg > 256 chars (should be 1 char shorter)'
+  parallel --results parallel_test_dir echo ::: 1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456; 
+  ls parallel_test_dir/1/
+  rm -rf parallel_test_dir
+
+echo '**'
+
 echo '### Test --halt-on-error 0'; 
   (echo "sleep 1;true"; echo "sleep 2;false";echo "sleep 3;true") | parallel -j10 --halt-on-error 0; 
   echo $?; 

testsuite/wanted-results/parallel-local-3s

@@ -1,3 +1,7 @@
+### bug #42089: --results with arg > 256 chars (should be 1 char shorter)
+1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456
+123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345
+**
 ### Test --halt-on-error 0
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