From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Tue, 9 Feb 2016 13:49:01 +0100
Subject: build: add support for choosing a different url filename part than the output file

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

Backport of r47591 and r48427

diff --git a/include/download.mk b/include/download.mk
index 937b5d3..e518cce 100644
--- a/include/download.mk
+++ b/include/download.mk
@@ -44,11 +44,11 @@ define DownloadMethod/unknown
 endef
 
 define DownloadMethod/default
-	$(SCRIPT_DIR)/download.pl "$(DL_DIR)" "$(FILE)" "$(MD5SUM)" $(foreach url,$(URL),"$(url)")
+	$(SCRIPT_DIR)/download.pl "$(DL_DIR)" "$(FILE)" "$(MD5SUM)" "$(URL_FILE)" $(foreach url,$(URL),"$(url)")
 endef
 
 define wrap_mirror
-	$(if $(if $(MIRROR),$(filter-out x,$(MIRROR_MD5SUM))),@$(SCRIPT_DIR)/download.pl "$(DL_DIR)" "$(FILE)" "$(MIRROR_MD5SUM)" || ( $(1) ),$(1))
+	$(if $(if $(MIRROR),$(filter-out x,$(MIRROR_MD5SUM))),@$(SCRIPT_DIR)/download.pl "$(DL_DIR)" "$(FILE)" "$(MIRROR_MD5SUM)" "" || ( $(1) ),$(1))
 endef
 
 define DownloadMethod/cvs
@@ -157,6 +157,7 @@ Validate/darcs=VERSION SUBDIR
 define Download/Defaults
   URL:=
   FILE:=
+  URL_FILE:=
   PROTO:=
   MD5SUM:=
   SUBDIR:=
diff --git a/scripts/download.pl b/scripts/download.pl
index cd68a7b..111d03c 100755
--- a/scripts/download.pl
+++ b/scripts/download.pl
@@ -11,15 +11,19 @@ use warnings;
 use File::Basename;
 use File::Copy;
 
-@ARGV > 2 or die "Syntax: $0 <target dir> <filename> <md5sum> [<mirror> ...]\n";
+@ARGV > 2 or die "Syntax: $0 <target dir> <filename> <md5sum> <url filename> [<mirror> ...]\n";
 
+my $url_filename;
 my $target = shift @ARGV;
 my $filename = shift @ARGV;
 my $md5sum = shift @ARGV;
+$url_filename = shift @ARGV unless $ARGV[0] =~ /:\/\//;
 my $scriptdir = dirname($0);
 my @mirrors;
 my $ok;
 
+$url_filename or $url_filename = $filename;
+
 sub localmirrors {
 	my @mlist;
 	open LM, "$scriptdir/localmirrors" and do {
@@ -106,7 +110,7 @@ sub download
 			return;
 		}
 	} else {
-		open WGET, "wget -t5 --timeout=20 --no-check-certificate $options -O- '$mirror/$filename' |" or die "Cannot launch wget.\n";
+		open WGET, "wget -t5 --timeout=20 --no-check-certificate $options -O- '$mirror/$url_filename' |" or die "Cannot launch wget.\n";
 		open MD5SUM, "| $md5cmd > '$target/$filename.md5sum'" or die "Cannot launch md5sum.\n";
 		open OUTPUT, "> $target/$filename.dl" or die "Cannot create file $target/$filename.dl: $!\n";
 		my $buffer;