[OpenWrt-Devel] [PATCH] build: allow openwrt.git packages to be replaced by feeds

[Mathieu Olivari]

Currently, replacing a package available in openwrt.git requires
modifications in openwrt.git, or requires duplicating the package in a
feed but with a different name, which causes all kind of problems
related to dependencies (all packages selecting it would have to be
modified accordingly to select the new package).

With this change, if a package with the same name is present both in
feeds/ and package/ folders, the one in feeds/ will override the one
in package/, both in the menuconfig and during the build.

This mechanism is particularly useful for vendor tree, or in general for
application which needs to replace one particular package which exists
within openwrt.git by a custom/newer version.

Signed-off-by: Mathieu Olivari <mathieu at qca.qualcomm.com>
---
 include/scan.awk |   17 +++++++++++++++++
 include/scan.mk  |    2 +-
 scripts/feeds    |    9 ++++++---
 3 files changed, 24 insertions(+), 4 deletions(-)
 create mode 100644 include/scan.awk

diff --git a/include/scan.awk b/include/scan.awk
new file mode 100644
index 0000000..39b2977
--- /dev/null
+++ b/include/scan.awk
@@ -0,0 +1,17 @@
+BEGIN { FS="/" }
+$1 ~ /^feeds/ { FEEDS[$NF]=$0 }
+$1 !~ /^feeds/ { PKGS[$NF]=$0 }
+END {
+	# Filter-out OpenWrt packages which have a feeds equivalent
+	for (pkg in PKGS)
+		if (pkg in FEEDS)
+			delete PKGS[pkg]
+	n = asort(PKGS)
+	for (i=1; i <= n; i++) {
+		print PKGS[i]
+	}
+	n = asort(FEEDS)
+	for (i=1; i <= n; i++){
+		print FEEDS[i]
+	}
+}
diff --git a/include/scan.mk b/include/scan.mk
index 0998333..138707d 100644
--- a/include/scan.mk
+++ b/include/scan.mk
@@ -43,7 +43,7 @@ endef
 
 $(FILELIST):
 	rm -f $(TMP_DIR)/info/.files-$(SCAN_TARGET)-*
-	$(call FIND_L, $(SCAN_DIR)) $(SCAN_EXTRA) -mindepth 1 $(if $(SCAN_DEPTH),-maxdepth $(SCAN_DEPTH)) -name Makefile | xargs grep -HE 'call (Build/DefaultTargets|Build(Package|Target)|.+Package)' | sed -e 's#^$(SCAN_DIR)/##' -e 's#/Makefile:.*##' | uniq > $@
+	$(call FIND_L, $(SCAN_DIR)) $(SCAN_EXTRA) -mindepth 1 $(if $(SCAN_DEPTH),-maxdepth $(SCAN_DEPTH)) -name Makefile | xargs grep -HE 'call (Build/DefaultTargets|Build(Package|Target)|.+Package)' | sed -e 's#^$(SCAN_DIR)/##' -e 's#/Makefile:.*##' | uniq | awk -f include/scan.awk > $@
 
 $(TMP_DIR)/info/.files-$(SCAN_TARGET).mk: $(FILELIST)
 	( \
diff --git a/scripts/feeds b/scripts/feeds
index 31ad544..01d9041 100755
--- a/scripts/feeds
+++ b/scripts/feeds
@@ -384,12 +384,15 @@ sub install_package {
 
 	# previously installed packages set the runtime package
 	# newly installed packages set the source package
-	$installed{$src} and return 0;
+	$installed{$src} and !is_core_package($src) and return 0;
 
 	# check previously installed packages
-	$installed{$name} and return 0;
+	$installed{$name} and !is_core_package($name) and return 0;
 	$installed{$src} = 1;
-	warn "Installing package '$src'\n";
+
+	is_core_package($src)
+		and warn "Overriding package '$src'\n"
+		or warn "Installing package '$src'\n";
 
 	$install_method{$type} or do {
 		warn "Unknown installation method: '$type'\n";
-- 
1.7.10.4
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