[Buildroot] [PATCH 1/1] package: add support for <pkg>_SITE_ONLY

[James Knight <git@jdknight.me>]

This will allow individual packages to hint that sources for the package
should only ever be downloaded from the specified `<pkg>_SITE` location.
Can be useful to avoid hitting configured cache sites when it is known
that a package would only ever be available from the package's site.

Signed-off-by: James Knight <git@jdknight.me>
---
 docs/manual/adding-packages-generic.adoc |  6 ++++++
 package/pkg-download.mk                  | 17 ++++++++++++++---
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/docs/manual/adding-packages-generic.adoc b/docs/manual/adding-packages-generic.adoc
index f0b0508f537d4a0329b48e2f8696ca43b098f1f2..35bd05e790520b92462e7acfb47472d44f5de792 100644
--- a/docs/manual/adding-packages-generic.adoc
+++ b/docs/manual/adding-packages-generic.adoc
@@ -336,6 +336,12 @@ not and can not work as people would expect it should:
      still patch the source code, use +LIBFOO_POST_RSYNC_HOOKS+, see
      xref:hooks-rsync[].
 
+* +LIBFOO_SITE_ONLY+ can be set to +YES+ to indicate that the package
+  should only be attempted to be downloaded from the configured site
+  defined by +LIBFOO_SITE+. Useful to avoid hitting configured cache
+  sites when it is known that the package would only ever be available
+  from the package's site.
+
 * +LIBFOO_GIT_SUBMODULES+ can be set to +YES+ to create an archive
   with the git submodules in the repository.  This is only available
   for packages downloaded with git (i.e. when
diff --git a/package/pkg-download.mk b/package/pkg-download.mk
index cf5959ea95549c896fd0837faf43f8e09f88b167..9b8ed92e9d3fb036aae6b84825cd2410337bf34d 100644
--- a/package/pkg-download.mk
+++ b/package/pkg-download.mk
@@ -59,6 +59,15 @@ gitlab = https://gitlab.com/$(1)/$(2)/-/archive/$(3)
 # Expressly do not check hashes for those files
 BR_NO_CHECK_HASH_FOR =
 
+################################################################################
+# DOWNLOAD_DEFAULT_URI - Default download site to get a package from.
+#
+# Argument 1 is the source location
+#
+################################################################################
+
+DOWNLOAD_DEFAULT_URI = $(patsubst %/,%,$(dir $(call qstrip,$(1))))
+
 ################################################################################
 # DOWNLOAD_URIS - List the candidates URIs where to get the package from:
 # 1) BR2_PRIMARY_SITE if enabled
@@ -77,8 +86,7 @@ DOWNLOAD_URIS += \
 endif
 
 ifeq ($(BR2_PRIMARY_SITE_ONLY),)
-DOWNLOAD_URIS += \
-	$(patsubst %/,%,$(dir $(call qstrip,$(1))))
+DOWNLOAD_URIS += $(DOWNLOAD_DEFAULT_URI)
 ifneq ($(call qstrip,$(BR2_BACKUP_SITE)),)
 DOWNLOAD_URIS += \
 	$(call getschemeplusuri,$(call qstrip,$(BR2_BACKUP_SITE)/$($(2)_DL_SUBDIR)),urlencode) \
@@ -129,7 +137,10 @@ define DOWNLOAD
 		$(if $(filter YES,$($(PKG)_SVN_EXTERNALS)),-r) \
 		$(if $($(PKG)_GIT_SUBMODULES),-r) \
 		$(if $($(PKG)_GIT_LFS),-l) \
-		$(foreach uri,$(call DOWNLOAD_URIS,$(1),$(PKG)),-u $(uri)) \
+		$(if $($(PKG)_SITE_ONLY), \
+			$(DOWNLOAD_DEFAULT_URI), \
+			$(foreach uri,$(call DOWNLOAD_URIS,$(1),$(PKG)),-u $(uri)) \
+		) \
 		$(2) \
 		$(QUIET) \
 		-- \
-- 
2.48.1.windows.1

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