+ # No tool found, fallback to wget
+ return "wget";
+}
+
+sub download_cmd {
+ my $url = shift;
+ my $filename = shift;
+
+ if ($download_tool eq "curl") {
+ return (qw(curl -f --connect-timeout 20 --retry 5 --location),
+ $check_certificate ? () : '--insecure',
+ shellwords($ENV{CURL_OPTIONS} || ''),
+ $url);
+ } elsif ($download_tool eq "wget") {
+ return (qw(wget --tries=5 --timeout=20 --output-document=-),
+ $check_certificate ? () : '--no-check-certificate',
+ shellwords($ENV{WGET_OPTIONS} || ''),
+ $url);
+ } elsif ($download_tool eq "aria2c") {
+ my $additional_mirrors = join(" ", map "$_/$filename", @_);
+ my @chArray = ('a'..'z', 'A'..'Z', 0..9);
+ my $rfn = join '', "${filename}_", map{ $chArray[int rand @chArray] } 0..9;
+
+ @mirrors=();
+
+ return join(" ", "[ -d $ENV{'TMPDIR'}/aria2c ] || mkdir $ENV{'TMPDIR'}/aria2c;",
+ "touch $ENV{'TMPDIR'}/aria2c/${rfn}_spp;",
+ qw(aria2c --stderr -c -x2 -s10 -j10 -k1M), $url, $additional_mirrors,
+ $check_certificate ? () : '--check-certificate=false',
+ "--server-stat-of=$ENV{'TMPDIR'}/aria2c/${rfn}_spp",
+ "--server-stat-if=$ENV{'TMPDIR'}/aria2c/${rfn}_spp",
+ "--daemon=false --no-conf", shellwords($ENV{ARIA2C_OPTIONS} || ''),
+ "-d $ENV{'TMPDIR'}/aria2c -o $rfn;",
+ "cat $ENV{'TMPDIR'}/aria2c/$rfn;",
+ "rm $ENV{'TMPDIR'}/aria2c/$rfn $ENV{'TMPDIR'}/aria2c/${rfn}_spp");
+ } else {
+ return join(" ", $download_tool, $url);
+ }