install_prereq: Don't install packages twice.

git-svn-id: http://svn.digium.com/svn/zaptel/branches/1.2@2880 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 23 insertions, 4 deletions

diff --git a/build_tools/install_prereq b/build_tools/install_prereq
index 0fb7f47..56463b4 100755
--- a/build_tools/install_prereq
+++ b/build_tools/install_prereq
@@ -26,6 +26,23 @@ install) testcmd='' ;;
 esac
 
 
+# Fixme: should be done by apt and not by dpkg?
+check_installed_debs() {
+	 dpkg-query -W --showformat '${Status} ${Package}\n' "$@" 2>/dev/null \
+	 | awk '/ not-installed/{print $4}'
+}
+
+# parsing the output of yum is close to impossible.
+# We'll use rpm and hope for the best:
+check_installed_rpms() {
+	for pack in "$@"
+	do
+		if ! rpm -q $pack >/dev/null 2>/dev/null
+		then echo $pack
+		fi
+	done
+}
+
 
 has_kernel_source() {
 	test -r /lib/modules/$KVERS/build/.config
@@ -38,6 +55,7 @@ in_test_mode() {
 handle_debian() {
 	# echo "# Distribution is Debian or compatible"
 	kernel_package=''
+	extra_packs=`check_installed_debs $PACKAGES_DEBIAN`
 	if ! has_kernel_source; then
 		kernel_package="linux-headers-$KVERS"
 		debian_release=`cat /etc/debian_version`
@@ -46,15 +64,16 @@ handle_debian() {
 		esac
 		echo "# Kernel source not found. Installing $kernel_package"
 	fi
-	$testcmd apt-get install -y $PACKAGES_DEBIAN $kernel_package
+	$testcmd apt-get install -y $extra_packs $kernel_package
 }
 
 handle_rh() {
-	# echo "# Distribution is Debian or compatible"
+	# echo "# Distribution is RedHat or similar."
 	kernel_package=''
+	extra_packs=`check_installed_rpms $PACKAGES_RH`
 	if ! has_kernel_source; then
 		kern_str='' # extra "kernel version"
-		case $KVERS in
+		case "$KVERS" in
 		*smp*) kern_str='-smp';;
 		*PAE*) kern_str='-PAE';;
 		*xen*) kern_str='-xen';;
@@ -68,7 +87,7 @@ handle_rh() {
 		echo "#"
 		echo "# and then reboot to upgrade to the newly installed kernel."
 	fi
-	$testcmd yum install -y $PACKAGES_RH $kernel_package
+	$testcmd yum install -y $extra_packs $kernel_package
 }
 
 if in_test_mode; then