build: allow openwrt.git packages to be replaced by feeds

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/ can override the one
in package/, both in the menuconfig and during the build, by passing the
"-f" option to "./scripts/feeds install"

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@qca.qualcomm.com>

SVN-Revision: 44076

1 files changed, 17 insertions, 0 deletions

diff --git a/include/scan.awk b/include/scan.awk
new file mode 100644
index 0000000000..39b2977228
--- /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]
+	}
+}