get submodules in cmake and package build

If the target directory src/cc/libbpf/ does not exist,
the top level CMakeLists.txt is changed to fetch
submodules with the following command
  git submodule update --init --recursive

The dev/rpm build scripts are also changed
to do git submodule update.
Signed-off-by: Yonghong Song <yhs@fb.com>

CMakeLists.txt

@@ -9,6 +9,12 @@ endif()
 
 enable_testing()
 
+# populate submodules (libbpf)
+if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/src/cc/libbpf/src)
+  execute_process(COMMAND git submodule update --init --recursive
+                  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+endif()
+
 include(cmake/GetGitRevisionDescription.cmake)
 include(cmake/version.cmake)
 include(CMakeDependentOption)

scripts/build-deb.sh

@@ -16,11 +16,24 @@ function cleanup() {
 }
 trap cleanup EXIT
 
+# populate submodules
+git submodule update --init --recursive
+
 . scripts/git-tag.sh
 
-git archive HEAD --prefix=bcc/ --format=tar.gz -o $TMP/bcc_$revision.orig.tar.gz
+git archive HEAD --prefix=bcc/ --format=tar -o $TMP/bcc_$revision.orig.tar
+
+# archive submodules
+pushd src/cc/libbpf
+git archive HEAD --prefix=bcc/src/cc/libbpf/ --format=tar -o $TMP/bcc_libbpf_$revision.orig.tar
+popd
 
 pushd $TMP
+
+# merge all archives into bcc_$revision.orig.tar.gz
+tar -A -f bcc_$revision.orig.tar bcc_libbpf_$revision.orig.tar
+gzip bcc_$revision.orig.tar
+
 tar xf bcc_$revision.orig.tar.gz
 cd bcc
 

scripts/build-release-rpm.sh

@@ -14,9 +14,24 @@ mkdir $TMP/{BUILD,RPMS,SOURCES,SPECS,SRPMS}
 
 llvmver=3.7.1
 
+# populate submodules
+git submodule update --init --recursive
+
 . scripts/git-tag.sh
 
-git archive HEAD --prefix=bcc/ --format=tar.gz -o $TMP/SOURCES/$git_tag_latest.tar.gz
+git archive HEAD --prefix=bcc/ --format=tar -o $TMP/SOURCES/bcc.tar
+
+# archive submodules
+pushd src/cc/libbpf
+git archive HEAD --prefix=bcc/src/cc/libbpf/ --format=tar -o $TMP/SOURCES/bcc_libbpf.tar
+popd
+
+# merge all archives into $git_tag_latest.tar.gz
+pushd $TMP/SOURCES
+tar -A -f bcc.tar bcc_libbpf.tar
+gzip -c bcc.tar > $git_tag_latest.tar.gz
+popd
+
 wget -P $TMP/SOURCES http://llvm.org/releases/$llvmver/{cfe,llvm}-$llvmver.src.tar.xz
 
 sed \

scripts/build-rpm.sh

@@ -14,9 +14,23 @@ mkdir $TMP/{BUILD,RPMS,SOURCES,SPECS,SRPMS}
 
 llvmver=3.7.1
 
+# populate submodules
+git submodule update --init --recursive
+
 . scripts/git-tag.sh
 
-git archive HEAD --prefix=bcc/ --format=tar.gz -o $TMP/SOURCES/bcc.tar.gz
+git archive HEAD --prefix=bcc/ --format=tar -o $TMP/SOURCES/bcc.tar
+
+# archive submodules
+pushd src/cc/libbpf
+git archive HEAD --prefix=bcc/src/cc/libbpf/ --format=tar -o $TMP/SOURCES/bcc_libbpf.tar
+popd
+
+# merge all archives into bcc.tar.gz
+pushd $TMP/SOURCES
+tar -A -f bcc.tar bcc_libbpf.tar
+gzip bcc.tar
+popd
 
 sed \
   -e "s/^\(Version:\s*\)@REVISION@/\1$revision/" \