support/download/dl-wrapper: add basic support for smb file download using curl

It allows to download files from smb share in buildroot packages.
Usage is specified in manual.

Signed-off-by: Guillaume Chaye <guillaume.chaye@zeetim.com>
[Peter: reword documentation]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

docs/manual/adding-packages-generic.adoc

@@ -337,6 +337,13 @@ not and can not work as people would expect it should:
      for +local+ packages, no patches are applied. If you need to
      still patch the source code, use +LIBFOO_POST_RSYNC_HOOKS+, see
      xref:hooks-rsync[].
+  ** +smb+ for retrieving source code from a SMB share. Used by
+     default when +LIBFOO_SITE+ begins with +smb://+. It uses +curl+
+     as download backend. Syntax expected:
+     +LIBFOO_SITE=smb://<server>/<share>/<path>+. This method might
+     require to define -u option in +LIBFOO_DL_OPTS+. For more
+     information, please refer to the
+     https://curl.se/docs/tutorial.html[curl documentation].
 
 * +LIBFOO_GIT_SUBMODULES+ can be set to +YES+ to create an archive
   with the git submodules in the repository.  This is only available

package/pkg-generic.mk

@@ -1260,7 +1260,7 @@ else ifeq ($$($(2)_SITE_METHOD),hg)
 DL_TOOLS_DEPENDENCIES += hg
 else ifeq ($$($(2)_SITE_METHOD),cvs)
 DL_TOOLS_DEPENDENCIES += cvs
-else ifneq ($(filter ftp ftps,$$($(2)_SITE_METHOD)),)
+else ifneq ($(filter ftp ftps smb,$$($(2)_SITE_METHOD)),)
 DL_TOOLS_DEPENDENCIES += curl
 endif # SITE_METHOD
 

support/download/dl-wrapper

@@ -96,7 +96,7 @@ main() {
         backend="${backend_urlencode%|*}"
         case "${backend}" in
             git|svn|cvs|bzr|file|scp|hg|sftp) ;;
-            ftp|ftps) backend="curl" ;;
+            ftp|ftps|smb) backend="curl" ;;
             *) backend="wget" ;;
         esac
         uri=${uri#*+}