scripts/download.pl: fix support for aria2c download tool on macos

Currently we use /dev/shm to place aria2c tmp file. This is not present
on macos. Use the openwrt tmp directory instead of the linux-only
/dev/shm to save compatibility with more os.

Fixes: d391236 ("download.pl: add aria2c support")
Signed-off-by: Christian Marangi <[email protected]>

Author: Ansuel

scripts/download.pl

@@ -80,7 +80,7 @@ sub download_cmd {
 	my $additional_mirrors = join(" ", map "$_/$filename", @_);
 
 	my @chArray = ('a'..'z', 'A'..'Z', 0..9);
-	my $rfn = join '', map{ $chArray[int rand @chArray] } 0..9;
+	my $rfn = join '', "${filename}_", map{ $chArray[int rand @chArray] } 0..9;
 	if (open CURL, '-|', 'curl', '--version') {
 		if (defined(my $line = readline CURL)) {
 			$have_curl = 1 if $line =~ /^curl /;
@@ -96,13 +96,15 @@ sub download_cmd {
 
 	if ($have_aria2c) {
 		@mirrors=();
-		return join(" ", "touch /dev/shm/${rfn}_spp;",
+		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,
 			$check_certificate ? () : '--check-certificate=false',
-			"--server-stat-of=/dev/shm/${rfn}_spp",
-			"--server-stat-if=/dev/shm/${rfn}_spp",
-			"-d /dev/shm -o $rfn;",
-			"cat /dev/shm/$rfn;", "rm /dev/shm/$rfn /dev/shm/${rfn}_spp");
+			"--server-stat-of=$ENV{'TMPDIR'}/aria2c/${rfn}_spp",
+			"--server-stat-if=$ENV{'TMPDIR'}/aria2c/${rfn}_spp",
+			"-d $ENV{'TMPDIR'}/aria2c -o $rfn;",
+			"cat $ENV{'TMPDIR'}/aria2c/$rfn;",
+			"rm $ENV{'TMPDIR'}/aria2c/$rfn $ENV{'TMPDIR'}/aria2c/${rfn}_spp");
 	} elsif ($have_curl) {
 		return (qw(curl -f --connect-timeout 20 --retry 5 --location),
 			$check_certificate ? () : '--insecure',