From d0332747e49a6c1f3879211210c1252458323c50 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 8 Jul 2021 10:48:44 +0200
Subject: setup_target: Don't try to install packages already installed

---
 core/bin/setup_target            | 10 +++++++---
 core/includes/packagemanager.inc | 24 ++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/core/bin/setup_target b/core/bin/setup_target
index ebb8218e..ae96b691 100755
--- a/core/bin/setup_target
+++ b/core/bin/setup_target
@@ -72,6 +72,7 @@ unset_required_vars () {
 # Install all the packages from all selected modules in current target
 install_all_packages () {
 	local module file config
+	declare -a missing
 	declare -A packages dupcheck
 	packages=()
 	for module in "${!MODULE_PATHS[@]}"; do
@@ -97,9 +98,12 @@ install_all_packages () {
 			dupcheck["$file"]=1
 		done
 	done
-	pinfo "Making sure required packages are installed..."
-	pdebug "List: ${!packages[*]}"
-	install_packages "${!packages[@]}"
+	missing=( $( filter_installed_packages "${!packages[@]}" ) )
+	if [ "${#missing[@]}" -gt 0 ]; then
+		pinfo "Making sure required packages are installed..."
+		pinfo "Potentially missing: ${missing[*]}"
+		install_packages "${missing[@]}"
+	fi
 	unset_required_vars
 }
 
diff --git a/core/includes/packagemanager.inc b/core/includes/packagemanager.inc
index 1e5b236d..f50455a2 100644
--- a/core/includes/packagemanager.inc
+++ b/core/includes/packagemanager.inc
@@ -82,6 +82,30 @@ list_packet_files() {
 	list_content_packages --files
 }
 
+#
+# Pass list of packages, returns filtered list, with packages removed
+# that are already installed
+#
+filter_installed_packages() {
+	local i
+	if [ "$PACKET_HANDLER" == "dpkg" ]; then
+		declare -A existing
+		for i in $( dpkg -l "$@" 2> /dev/null | awk '$1 == "ii" {print $2}' ); do
+			existing["$i"]=1
+		done
+		for i in "$@"; do
+			[ -n "${existing["${i}"]}" ] || [ -n "${existing["${i}:${AMD64_X86}"]}" ] || echo "$i"
+		done
+	elif [ "$PACKET_HANDLER" == "rpm" ]; then
+		for i in "$@"; do
+			rpm --quiet -q "$i" &> /dev/null || echo "$i"
+		done
+	else
+		pwarning "'Don't know how to determine installation status of packages for $PACKET_HANDLER"
+		echo "$@"
+	fi
+}
+
 #
 # install individual package depending on package manager
 #
-- 
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