parallel: Allow IPv6 and _ in hostname.

src/parallel

@@ -6919,7 +6919,7 @@ sub new($$) {
     if($s =~ s/^(.*) //) { $sshcommand = $1; }
 
     #	[user:pass@]server:port
-    if($s =~ s/([^@]+)@//) {
+    if($s =~ s/^([^@]+)@//) {
 	my $userpw = $1;
 	# user[:pass]
 	if($userpw =~ s/:(.*)//) {
@@ -6932,13 +6932,40 @@ sub new($$) {
 	}
 	$user = $userpw;
     }
-
     #	[server]:port
-    if($s =~ s/([-a-z0-9.]+)//i) { $host = $1; }
+    if(not $s =~ /:.*:/
+       and
+       $s =~ s/^([-a-z0-9._]+)//i) {
+	# Not IPv6 (IPv6 has 2 or more ':')
+	$host = $1;
+    } elsif($s =~ s/^(\\[\[\]box0-9a-f.]+)//i) {
+	# RFC2673 allows for:
+	#   \[b11010000011101] \[o64072/14] \[xd074/14] \[208.116.0.0/14]
+	$host = $1;	
+    } elsif($s =~ s/^\[([0-9a-f:]+)\]//i
+	    or
+	    $s =~ s/^([0-9a-f:]+)//i) {
+	# RFC5952
+	#   [2001:db8::1]:80
+	#   2001:db8::1.80
+	#   2001:db8::1p80
+	#   2001:db8::1#80
+	#   2001:db8::1:80 - not supported
+	#   2001:db8::1 port 80 - not supported
+	$host = $1;
+    }
 
     #	[:port]
-    if($s =~ s/:(\w+)//i) { $port = $1; }
+    if($s =~ s/^:(\w+)//i) {
-
+	$port = $1;
+    } elsif($s =~ s/^[p\.\#](\w+)//i) {
+	# RFC5952
+	#   2001:db8::1.80
+	#   2001:db8::1p80
+	#   2001:db8::1#80
+	$port = $1;
+    }
+	
     if($s and $s ne ':') {
 	::die_bug("SSHLogin parser failed on '$origs' => '$s'");
     }
@@ -6949,7 +6976,7 @@ sub new($$) {
 	($user && $user."@").
 	($host && $host).
 	($port && ":$port");
-    if($s eq ':') {
+    if($host eq ':') {
 	$local = 1;
 	$string = ":";
     } else {

testsuite/tests-to-run/parallel-local-30s.sh

@@ -588,6 +588,27 @@ par_keeporder_roundrobin() {
     fi
 }
 
+par_test_ipv6_format() {
+    echo '### Host as IPv6 address'
+    (
+	ifconfig |
+            # Get IPv6 addresses of local server
+            perl -nE '/inet6 ([0-9a-f:]+) .*(host|global)/ and
+              map {say $1,$_,22; say $1,$_,"ssh"} qw(: . #  p q)' |
+            # 9999::9999:9999:22 => [9999::9999:9999]:22
+	    # 9999::9999:9999q22 => 9999::9999:9999
+            perl -pe 's/(.*):(22|ssh)$/[$1]:$2/;s/q.*//;'
+	ifconfig |
+            # Get IPv4 addresses
+            perl -nE '/inet (\S+) / and
+              map {say $1,$_,22; say $1,$_,"ssh"} qw(:  q)' |
+            # 9.9.9.9q22 => 9.9.9.9
+            perl -pe 's/q.*//;'
+    ) |
+	parallel -j30 --delay 0.1 --argsep , parallel -S {} true ::: 1 ||
+	echo Failed
+}
+
 # was -j6 before segfault circus
 export -f $(compgen -A function | grep par_)
 compgen -A function | grep par_ | sort |

testsuite/wanted-results/parallel-local-30s

@@ -1858,3 +1858,4 @@ par_test_detected_shell	test_known_shell_pipe yash	Global::shell /usr/bin/yash
 par_test_detected_shell	test_known_shell_pipe zsh	Global::shell /usr/bin/zsh
 par_test_diff_roundrobin_k	### test there is difference on -k
 par_test_diff_roundrobin_k	OK
+par_test_ipv6_format	### Host as IPv6 address