[PATCH] buildroot: improve git submodule handling for packages

[Darik Horn]

Move the `--recursive` switch from `git clone` to `git submodule`
so that submodules are cloned for upstream branches where the
PKG_SOURCE_VERSION commit-ish has a different .gitmodules
configuration than the repository default.

This is, for example, required when the master branch for a source
package does not use submodules, but its topic branch for OpenWRT
does.

This changes the buildroot dependency from git-1.6.2 to git 1.7.12.2,
which was released September 2012.

Signed-off-by: Darik Horn <dajhorn at vanadac.com>
---
 include/download.mk     | 5 +++--
 include/prereq-build.mk | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/download.mk b/include/download.mk
index adaa2e6..d593344 100644
--- a/include/download.mk
+++ b/include/download.mk
@@ -88,8 +88,9 @@ define DownloadMethod/git
 		cd $(TMP_DIR)/dl && \
 		rm -rf $(SUBDIR) && \
 		[ \! -d $(SUBDIR) ] && \
-		git clone $(URL) $(SUBDIR) --recursive && \
-		(cd $(SUBDIR) && git checkout $(VERSION) && git submodule
update) && \
+		git clone $(URL) $(SUBDIR) && \
+		(cd $(SUBDIR) && git checkout $(VERSION) && \
+		  git submodule update --init --recursive) && \
 		echo "Packing checkout..." && \
 		rm -rf $(SUBDIR)/.git && \
 		$(call dl_pack,$(TMP_DIR)/dl/$(FILE),$(SUBDIR)) && \
diff --git a/include/prereq-build.mk b/include/prereq-build.mk
index 211201a..c06adaf 100644
--- a/include/prereq-build.mk
+++ b/include/prereq-build.mk
@@ -144,8 +144,8 @@ $(eval $(call SetupHostCommand,python,Please install
Python 2.x, \
 $(eval $(call SetupHostCommand,svn,Please install the Subversion client, \
 	svn --version | grep Subversion))
 
-$(eval $(call SetupHostCommand,git,Please install Git (git-core) >= 1.6.5,
\
-	git clone 2>&1 | grep -- --recursive))
+$(eval $(call SetupHostCommand,git,Please install Git (git-core) >=
1.7.12.2, \
+	git submodule update --help 2>&1 | grep -- --recursive))
 
 $(eval $(call SetupHostCommand,file,Please install the 'file' package, \
 	file --version 2>&1 | grep file))
-- 
1.9.1

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