if the SITE URL includes '+', the SITE_MOTHOD will be prefixed to the download url of the main package, but the extra download url would not be. If the SITE URL accidentally include the sign of '+', url link before '+' would be parsed as SITE MOTHOD by dl-wrapper, and the url broken.

Take android-tools package for example:

ANDROID_TOOLS_SITE = https://launchpad.net/ubuntu/+archive/primary/+files
ANDROID_TOOLS_EXTRA_DOWNLOADS = android-tools_$(ANDROID_TOOLS_VERSION)-3ubuntu41.debian.tar.gz


while build the android-tools package, ALL_DOWNLOADS will be expended as:


for p in https+https://launchpad.net/ubuntu/+archive/primary/+files/android-tools_4.2.2+git20130218.orig.tar.xz   https://launchpad.ne
t/ubuntu/+archive/primary/+files/android-tools_4.2.2+git20130218-3ubuntu41.debian.tar.gz; do \
        if test ! -e /mnt/fileroot/jun.zhang/buildroot-git/buildroot/dl/android-tools/`basename $p` ; then \
                echo ">>> android-tools 4.2.2+git20130218 Downloading" ; \
                break ; \
        fi ; \
done


there's no 'https+' prefixed to the url, SITE_MOTHOD missing.

and while downloading package, url corrupted:

--2019-11-05 14:10:29--  http://archive/primary/+files/android-tools_4.2.2+git20130218-3ubuntu41.debian.tar.gz


with the following patch, problem resolved:


diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
index 893faba22a..63b6b25a7f 100644
--- a/package/pkg-generic.mk
+++ b/package/pkg-generic.mk
@@ -523,8 +523,7 @@ endif
 $(2)_ALL_DOWNLOADS = \
        $$(if $$($(2)_SOURCE),$$($(2)_SITE_METHOD)+$$($(2)_SITE)/$$($(2)_SOURCE)) \
        $$(foreach p,$$($(2)_PATCH) $$($(2)_EXTRA_DOWNLOADS),\
-               $$(if $$(findstring ://,$$(p)),$$(p),\
-                       $$($(2)_SITE)/$$(p)))
+               $$($(2)_SITE_METHOD)+$$(if $$(findstring ://,$$(p)),$$(p),$$($(2)_SITE)/$$(p)))
 
 ifndef $(2)_SITE
  ifdef $(3)_SITE