common.sh: build/clone optimizations for kernel builds

Currently kernel source repo is cloned twice; once for guest and once
for host. Instead, clone guest repo, then copy the directory to use
as host repo.

Also add support for doing building latest commits from stable-commits
without needing to remove/re-clone the kernel repo.

Also remove existing linux deb/rpm packages prior to build so they don't
end up in package tarball for new builds.

1 files changed, 27 insertions, 9 deletions

diff --git a/common.sh b/common.sh
index 83b3e82..afa141b 100755
--- a/common.sh
+++ b/common.sh
@@ -18,6 +18,18 @@ build_kernel()
 	mkdir -p linux
 	pushd linux >/dev/null
 
+	if [ ! -d guest ]; then
+		run_cmd git clone ${KERNEL_GIT_URL} guest
+		pushd guest >/dev/null
+		run_cmd git remote add current ${KERNEL_GIT_URL}
+		popd
+	fi
+
+	if [ ! -d host ]; then
+		# use a copy of guest repo as the host repo
+		run_cmd cp -r guest host
+	fi
+
 	for V in guest host; do
 		# Check if only a "guest" or "host" or kernel build is requested
 		if [ "$kernel_type" != "" ]; then
@@ -26,15 +38,15 @@ build_kernel()
 			fi
 		fi
 
-		[ -d ${V} ] || {
-			if [ "${V}" = "guest" ]; then
-				BRANCH="${KERNEL_GUEST_BRANCH}"
-			else
-				BRANCH="${KERNEL_HOST_BRANCH}"
-			fi
+		if [ "${V}" = "guest" ]; then
+			BRANCH="${KERNEL_GUEST_BRANCH}"
+		else
+			BRANCH="${KERNEL_HOST_BRANCH}"
+		fi
 
-			run_cmd git clone --single-branch -b ${BRANCH} ${KERNEL_GIT_URL} ${V}
-		}
+		# Nuke any previously built packages so they don't end up in new tarballs
+		# when ./build.sh --package is specified
+		rm -f linux-*-snp-${V}*
 
 		VER="-snp-${V}"
 
@@ -43,7 +55,13 @@ build_kernel()
 		run_cmd $MAKE distclean
 
 		pushd ${V} >/dev/null
-			COMMIT=$(git log --format="%h" HEAD~1..HEAD)
+			# If ${KERNEL_GIT_URL} is ever changed, 'current' remote will be out
+			# of date, so always update the remote URL first
+			run_cmd git remote set-url current ${KERNEL_GIT_URL}
+			run_cmd git fetch current
+			run_cmd git checkout current/${BRANCH}
+			COMMIT=$(git log --format="%h" -1 HEAD)
+
 			run_cmd "cp /boot/config-$(uname -r) .config"
 			run_cmd ./scripts/config --set-str LOCALVERSION "$VER-$COMMIT"
 			run_cmd ./scripts/config --disable LOCALVERSION_AUTO