add --version option

coverage.sh

@@ -224,6 +224,21 @@ else
 	./run_null.sh
 fi
 
+print_header "test --version"
+cat << END > shared/test.sh
+#!/bin/sh
+set -eu
+export LC_ALL=C.UTF-8
+$CMD --version | egrep --quiet '^mmdebstrap [0-9](\.[0-9])+$'
+END
+if [ "$HAVE_QEMU" = "yes" ]; then
+	./run_qemu.sh
+elif [ "$defaultmode" = "root" ]; then
+	./run_null.sh SUDO
+else
+	./run_null.sh
+fi
+
 print_header "mode=root,variant=apt: create directory"
 cat << END > shared/test.sh
 #!/bin/sh

mmdebstrap

@@ -15,6 +15,8 @@
 use strict;
 use warnings;
 
+our $VERSION = '0.3.0';
+
 use English;
 use Getopt::Long;
 use Pod::Usage;
@@ -1699,6 +1701,7 @@ sub main() {
     Getopt::Long::Configure ('default', 'bundling', 'auto_abbrev', 'ignore_case_always');
     GetOptions(
 	'h|help'   => sub { pod2usage(-exitval => 0, -verbose => 2) },
+	'version'  => sub { print STDOUT "mmdebstrap $VERSION\n"; exit 0; },
 	'components=s' => \$options->{components},
 	'variant=s' => \$options->{variant},
 	'include=s' => \$options->{include},
@@ -2445,6 +2448,10 @@ require a double dash and may be abbreviated to uniqueness.
 
 Print this help text and exit.
 
+=item B<--version>
+
+Print the B<mmdebstrap> version and exit.
+
 =item B<--variant>=I<name>
 
 Choose which package set to install. Valid variant I<name>s are B<extract>,