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/usr/bin/msb is in mysql-sandbox 3.1.04-1.

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The actual contents of the file can be viewed below.

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#!/usr/bin/perl
# msb
#    The MySQL Sandbox
#    Copyright (C) 2006-2015 Giuseppe Maxia
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.

use strict;
use warnings;
use MySQL::Sandbox qw(runs_as_root);

my $DEBUG = $MySQL::Sandbox::DEBUG;

runs_as_root();

my $msb = MySQL::Sandbox->new();

my $version = shift
    or get_help();

my $group_prefix = '';
my $tarball = '';

if ( $version =~ /^[rm]$/) {
    $group_prefix = $version;
    $version = shift
        or get_help();
}

$ENV{SANDBOX_HOME} = $ENV{SANDBOX_HOME} || "$ENV{HOME}/sandboxes";
#unless ( -d $ENV{SANDBOX_HOME} ) {
#    die "\$SANDBOX_HOME not found at $ENV{SANDBOX_HOME}\n";
#}

$version =~ s/\s*//g;

if ($version =~ /(\d)\.(\d)\.(\d+).*tar\.gz$/) {
    $tarball = $version;
    $version = "$group_prefix$1.$2.$3";    
    unless (-f $tarball) {
        die "file not found $tarball\n";
    }
}

if ( $version =~ /^(\d)\.(\d)\.(\d+)$/ ) { # install single
    install_and_restart('single', $version, "$1$2$3");
}
elsif ( $version =~ /^(r|m)(\d)\.(\d)\.(\d+)$/ ) { # install group
    my $group = $1;
    my $simple_version = "$2$3$4";
    my %groupsb = (
        r   => 'replication',
        m   => 'multiple',
    );
    install_and_restart( $groupsb{$group}, $version, $simple_version);
}

if ($version =~ /^r(\d+)$/i) { # replication
    open_replication($1);
}
elsif ($version =~ /^m(\d+)$/i) { # multiple
    open_multi($1);
}
elsif ($version =~ /^\d+$/) { #
    open_single($version);
}
elsif (-d "$ENV{SANDBOX_HOME}/$version") {
    open_single($version, "nosearch");
}
else {
    # this should fail when the directory is not found
}

sub find_sb {
    my ($prefix, $version) = @_;
    my @dirs = glob ("$ENV{SANDBOX_HOME}/$prefix*");
    $prefix =~ s/_//g;
    for my $dir (@dirs) {
        my $simple_dir = $dir;
        $simple_dir =~ s{.*/}{};
        $simple_dir =~ s/_//g;
        if ("$prefix$version" eq $simple_dir) {
            return $dir;
        }
    }
    return;
}

sub open_single {
    my ($version, $nosearch) = @_;
    my $sb_dir = find_sb('msb', $version);
    if ($nosearch) {
        $sb_dir= "$ENV{SANDBOX_HOME}/$version";
    }
    else {
        $sb_dir = find_sb('msb', $version);
    }
    if ($sb_dir) {
        my ($pid) = glob("$sb_dir/data/*.pid");
        unless ($pid) {
            system "$sb_dir/start";
        }
        exec "$sb_dir/use", @ARGV;
    }
    else {
        die "can't find a matching sandbox for $version\n";
    }    
}

sub open_replication {
    my ($version) = @_;
    my $sb_dir = find_sb('rsandbox', $version);
    # print "replication ($sb_dir)\n";
    if ($sb_dir) {
        my ($pid) = glob("$sb_dir/master/data/*.pid");
        unless ($pid) {
           system  "$sb_dir/start_all";
        }
        my $item = 'm';
        if ($ARGV[0] =~ /^\d+$/ ) {
            my $node = shift @ARGV;
            $item = "s$node";
        }
        exec "$sb_dir/$item", @ARGV;
    }
    else {
        die "can't find a matching sandbox for $version\n";
    }    
}

sub open_multi {
    my ($version) = @_;
    my $sb_dir = find_sb('multi_msb', $version);
    if ($sb_dir) {
        my ($pid) = glob("$sb_dir/node1/data/*.pid");
        unless ($pid) {
            system "$sb_dir/start_all";
        }
        my $node = 1;
        if ($ARGV[0] =~ /^\d+$/ ) {
            $node = shift @ARGV;
        }
        exec "$sb_dir/n$node", @ARGV;
    }
    else {
        die "can't find a matching sandbox for $version\n";
    }    
}

sub get_help {
    my ($msg) = @_;
    if ($msg) {
        print "**** $msg\n";
    } 
    print $msb->credits(); 
    print "MySQL Sandbox shortcut\n",
          "Invokes a single or group sandbox easily.\n",
          "(It will start the sandbox if it is not active).\n",
          "\n",
          "Usage: msb [r|m]version [node] [options]\n",
          #"\n",
          "\tr -> replication\tm -> multiple\n",
          "version could be a plain number to open a sandbox\n",
          "or a dotted number, to install it if it doesn't exist\n",
          "or the full path to a tarball\n",
          "\t[node] is used for r|m\n",
          "\t[options] are what you would pass to the sandbox app\n";
    print "Examples:\n",
          "msb 5135\n",
          "# runs \$SANDBOX_HOME/msb_5_1_35/use\n",
          "\n",
          "msb 5.1.35\n",
          "# runs make_sandbox 5.1.35 and \$SANDBOX_HOME/msb_5_1_35/use\n",
          "\n",
          "msb r5135\n",
          "# runs \$SANDBOX_HOME/rsandbox_5_1_35/m\n",
          "\n",
          "msb r5.1.35\n",
          "# runs make_replication_sandbox 5.1.35 and \$SANDBOX_HOME/msb_5_1_35/use\n",
          "\n";
    exit 1;
}

sub install_and_restart {
    my ($application, $version, $simple_version) = @_;
    my $cmd;
    my $prefix = '';
    if ($version =~ /^([rm])/) {
        $prefix = $1;
        $version =~ s/^[rm]//;
    }
    my $uversion = $version;
    $uversion =~ s/\./_/g;
    my $run_installer = 1;
    if ($application eq 'single') {
        $cmd =  'make_sandbox ' . ($tarball || $version) . ' -- --no_confirm';
        if ( -d "$ENV{SANDBOX_HOME}/msb_$uversion") {
            $run_installer = 0;
        }
    }
    elsif ($application eq 'replication') {
        $cmd =  'make_replication_sandbox ' . ($tarball || $version);
        if ( -d "$ENV{SANDBOX_HOME}/rsandbox_$uversion") {
            $run_installer = 0;
        }
    }
    elsif ($application eq 'multiple') {
        $cmd =  'make_multiple_sandbox ' . ($tarball || $version);
        if ( -d "$ENV{SANDBOX_HOME}/multi_msb_$uversion") {
            $run_installer = 0;
        }
    }
    else {
        die "unknown applicationn $application\n";
    }
    if ($run_installer) {
        print "EXECUTING $cmd\n" if $DEBUG;
        my $result = system($cmd);
        if ($result) {
            die "installation error ($!)\n";
        }
    }
    exec $0, "$prefix$simple_version", @ARGV; 
}