Fix --install. Support output=append:FILE.

bin/pt-agent

@@ -6996,6 +6996,7 @@ sub run_service {
       my $task_output_file = "$tmp_dir/$prefix."
                            . $service->name
                            . ".output.$taskno";
+      my $append           = 0;
       my $output_file;
       my $join_char;
       my ($store_key, $store_key_value_tuple);
@@ -7031,6 +7032,10 @@ sub run_service {
          $store_key = $taskno;
          $output_file = $task_output_file;
       }
+      elsif ( $output =~ m/append:(\S+)/ ) {
+         $output_file = $1;
+         $append = 1;
+      }
 
       if ( !$output_file ) {
          $output_file = '/dev/null';
@@ -7106,7 +7111,7 @@ sub run_service {
          # special vars like __RUN_N_OUTPUT__, __TMPDIR__, etc.
          my $cmd = join(' ',
             $task->program,
-            '>',
+            ($append ? '>>' : '>'),
             $output_file,
          );
          $cmd = replace_special_vars(
@@ -8219,7 +8224,6 @@ sub install {
          $step_result = undef;
       }
       print "$result\n" if $stepno && !$repeat;
-      return if $done;
       while ( $skip ) {
          printf $step_fmt,
             $stepno + ($repeat ? 0 : 1),
@@ -8229,6 +8233,10 @@ sub install {
          print "SKIP\n";
          $skip--;
       }
+      if ( $done ) {
+         print "INSTALLATION COMPLETE\n";
+         return;
+      }
       # This step
       printf $step_fmt,
          $stepno + ($repeat ? 0 : 1),
@@ -8257,17 +8265,9 @@ sub install {
    if ( !$crontab ) {
       die "cron is not installed, or crontab is not in your PATH.\n";
    }
-   $next_step->();
 
    # Must have a valid API key.
    my $api_key = $o->get('api-key');
-   my $client;
-   my $entry_links;
-   if ( $flags->{offline} ) {
-      $skip++;
-   }
-   else {
-      $next_step->();
    if ( !$api_key ) {
       print "\n";
       if ( $interactive || -t STDIN ) {
@@ -8286,6 +8286,13 @@ sub install {
          die "Please specify your --api-key.\n";
       }
    }
+   my $client;
+   my $entry_links;
+   if ( $flags->{offline} ) {
+      $skip++;
+   }
+   else {
+      $next_step->();
       eval {
          ($client, $entry_links) = get_api_client(
             api_key  => $api_key,
@@ -8428,14 +8435,20 @@ sub install {
    # ########################################################################
    $next_step->(done => 1);
 
-   if ( $flags->{offline} ) {
-   }
-   else {
    my $hostname = `hostname`;
    chomp($hostname);
 
-      print "\nThe agent has been installed and started, but it is not running any services yet.  "
+   if ( $flags->{offline} ) {
-         . "Go to https://cloud.percona.com/agents#$hostname to enable services for this agent.\n\n";
+      print "The agent has been installed, but it was not started.  "
+         . "Run pt-agent --daemonize to start the agent, then go to "
+         . "https://cloud.percona.com/agents#$hostname to enable services "
+         . "for the agent.\n";
+   }
+   else {
+      print "The agent has been installed and started, but it is not "
+         . "running any services yet.  Go to "
+         . "https://cloud.percona.com/agents#$hostname to enable services"
+         . "for the agent.\n";
    }
 
    return;
@@ -8451,7 +8464,7 @@ sub create_mysql_user {
       $cxn->dbh->do($sql);
    };
    if ( $EVAL_ERROR ) {
-      die "Sorry, an error occurred while creating a MySQL user for pt-agent: "
+      die "Sorry, an error occurred while creating a MySQL user for the agent: "
          . $EVAL_ERROR;
    }
    $cxn->dbh->disconnect();